Michel Alves, profile picture
Uploaded byMichel Alves
PDF, PPTX3,276 views

About Perception and Hue Histograms in HSV Space

The document discusses color perception and hue histograms. It begins by showing an image and asking the reader about their perception of the colors. It then demonstrates how histograms of hue can provide insight into the distribution of colors in an image compared to looking at RGB channel histograms. Different methods for constructing hue histograms are presented, including simple frequency, weighted by saturation, and Gaussian weighting. The document argues that hue histograms can help improve color perception compared to RGB channels alone.

Embed presentation

Download as PDF, PPTX
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing About Perception and HueAbout Perception and Hue Histograms in HSV SpaceHistograms in HSV Space Michel Alves dos Santos May, 2015 *original *hue-saturation projection *saturation *brightness *hue histogram
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing IntroductionIntroduction red channel green channel blue channel What's your perception about the colors of this image? *Barns Grand Teton: Grand Teton National Park Note the marked areas! And the distribution by channel? How each color component behaves in its proper channel?
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing IntroductionIntroduction*Barns Grand Teton: Grand Teton National Park Observe the distribution of energy for each channel: But, about the hues? What the RGB model can tell us? This kind of graph shows us how the energy of each channel is distributed! red channel green channel blue channel
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing IntroductionIntroduction*Barns Grand Teton: Grand Teton National Park Firstly, we will use the HSV Color Space ... How to build a hue histogram? Now, note the diagram below: Can you identify hues distinctly? Probably not! Because of clusters and the intersection of colors! A histogram of hues can help us improve our perception!
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing RGB Vs HSVRGB Vs HSV (Color Spaces)(Color Spaces) RGB Color Space HSV Color Space *Solids produced using POV­Ray [http://lib.povray.org/] Simplicity in representation and storage Close to human perception Some point operations are faster... Easy interpolation between colors Invariant to illumination transformsHave lighting and color properties togetherHave lighting and color properties together
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing RGB Vs HSVRGB Vs HSV (Color Spaces – a common mistake...)(Color Spaces – a common mistake...) RGB Color Space HSV Color Space *Solids produced using POV­Ray [http://lib.povray.org/] A cone is commonly adopted but cylindrical representation is more mathematically accurate.
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing RGB Vs HSVRGB Vs HSV (Color Spaces – Solids Transition)(Color Spaces – Solids Transition) RGB Color Space HSV Color Space *Solids produced using POV­Ray [http://lib.povray.org/]
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing RGB Vs HSVRGB Vs HSV (Transformation)(Transformation) RGB HSV Transformation isn't linear! Some care should be taken with monochromatic pixels! *[avoid divisions by zero]
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing RGB Vs HSVRGB Vs HSV (Transformation)(Transformation) RGB HSV Transformation isn't linear! Alternative Some care should be taken with monochromatic pixels! *[avoid divisions by zero]
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing RGB Vs HSVRGB Vs HSV (Color Image Thresholding)(Color Image Thresholding) Find the yellow M&M's! A simple task for a human observer, but not so easy for machines: Complexity depends of the space! Using RGB: R: G: B: 200 255 200 255 0 50 Using HSV:(3 intervals) (1 interval)
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing RGB Vs HSVRGB Vs HSV (Color Image Thresholding)(Color Image Thresholding) Find the yellow M&M's! A simple task for a human observer, but not so easy for machines: Complexity depends of the space! Using RGB: R: G: B: 200 255 200 255 0 50 Using HSV:(3 intervals) (1 interval) [This approach is independent of saturation or brightness]
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing *Barns Grand Teton: Grand Teton National Park RGB Vs HSVRGB Vs HSV (Color Image Thresholding)(Color Image Thresholding) *hues of sky *hues of barn *hues of grass Using this feature some tasks can be easily performed! As detection of regions or objects by its characteristic colors! It's one of the bases of color perception!
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing RGB Vs HSVRGB Vs HSV (Color Perception)(Color Perception) And now, what's your perception about the colors of this image? *Barns Grand Teton: Grand Teton National Park Where we have more blue hues? Where we have more orange hues? Where we have more green hues? Here we have a blend of yellow and green hues! Do not fool yourself! (Grass???) (Sky) (Barn) *hue histogram *hue projection
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing RGB Vs HSVRGB Vs HSV (Color Perception)(Color Perception) And now, what's your perception about the colors of this image? *Barns Grand Teton: Grand Teton National Park Where we have more blue hues? Where we have more orange hues? Where we have more green hues? Here we have a blend of yellow and green hues! Do not fool yourself! (Grass???) (Sky) (Barn) *hue histogram *hue projection
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing RGB Vs HSVRGB Vs HSV (Meanings of the Components)(Meanings of the Components) Energy of red channel Energy of green channel Energy of blue channel What is the basic color? How vibrant is the color? How brightness is the color?
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue HistogramsHue Histograms *hue projection *saturation *value We will build our histograms taking account the number of positions of the hue circle! Number of bins (discrete positions): 0..360 or 0 to 2π Note that the hue channel is a ring structure!
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms - StepsHue Histograms - Steps Our input images are in RGB Color Space, the output is a transformed hue histogram... We are applying a square root transformation to obtain the final hue histogram... Observe the follow diagram! The metric of contribution is a flexible part of the process and depends of application...
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms - StepsHue Histograms - Steps Our input images are in RGB Color Space, the output is a transformed hue histogram... We are applying a square root transformation to obtain the final hue histogram... Observe the follow diagram! The metric of contribution is a flexible part of the process and depends of application... Get to work! Now, I will show some metrics!
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms :: Simple FrequencyHue Histograms :: Simple Frequency*Barns Grand Teton: Grand Teton National Park Kronecker Delta Hue Picture or Image *hue histogram This is a simple counting! It doesn't consider other HSV channels. Bin Position PixelHistogram Notation
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms :: by SaturationHue Histograms :: by Saturation*Barns Grand Teton: Grand Teton National Park *hue histogram Kronecker Delta Hue Picture Only considers the saturation channel... Saturation Ref: [LP'15] Bin Position PixelHistogram
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms :: by ContributionHue Histograms :: by Contribution*Barns Grand Teton: Grand Teton National Park *hue histogram Kronecker DeltaSaturation ValuePicture Hue Histogram Pixel Bin Position
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms ::Hue Histograms :: Weighted by ContributionWeighted by Contribution *Barns Grand Teton: Grand Teton National Park *hue histogram Kronecker DeltaSaturation ValuePicture Hue *similar to the previous! Normalization Factor Bin Position Pixel
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms :: Hasan WeightedHue Histograms :: Hasan Weighted Ref: [MAH'12] *hue histogram *Barns Grand Teton: Grand Teton National Park Picture Previous Histogram *exponential weighted histogram Mean of Hues *similar to the previous??? Mean Variance Variance of Hues Notation Weighted Histogram Bin Position
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms :: Hasan WeightedHue Histograms :: Hasan Weighted Ref: [MAH'12] *hue histogram *Barns Grand Teton: Grand Teton National Park Picture Previous Histogram *exponential weighted histogram Mean of Hues *similar to the previous??? Variance of Hues *before weighting *after weighting frequency frequencyhue hue Weighted Histogram Bin Position
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms :: Gaussian WeightedHue Histograms :: Gaussian Weighted Gaussian Function *Barns Grand Teton: Grand Teton National Park *hue histogram Picture Previous Histogram Weighted Histogram Bin Position Mean of Hues Variance of Hues
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms ::Hue Histograms :: Smoothed by BoxSmoothed by Box *hue histogram, window size = 1x9 *Barns Grand Teton: Grand Teton National Park Box function Convolution Gaussian Function Previous HistogramWeighted Histogram
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms ::Hue Histograms :: Smoothed by BoxSmoothed by Box *hue histogram, window size = 1x9 *Barns Grand Teton: Grand Teton National Park Box function Convolution Gaussian Function Previous HistogramWeighted Histogram *smoothing employing a boxcar function
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms ::Hue Histograms :: Smoothed by GaussianSmoothed by Gaussian *hue histogram, window size = 1x9 *Barns Grand Teton: Grand Teton National Park Gaussian function Convolution Gaussian Function Previous HistogramWeighted Histogram
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms ::Hue Histograms :: Smoothed by a KernelSmoothed by a Kernel *hue histogram, window size = 1x11 *Barns Grand Teton: Grand Teton National Park kernel Kernel function Convolution Gaussian Function Previous HistogramWeighted Histogram
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms ::Hue Histograms :: Smoothed by a KernelSmoothed by a Kernel *hue histogram, window size = 1x11 *Barns Grand Teton: Grand Teton National Park kernel function employed: Epanechnikov kernel Kernel function Convolution Gaussian Function Previous HistogramWeighted Histogram
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms ::Hue Histograms :: Spatial Color CoherenceSpatial Color Coherence *hue histogram, window size = 1x11 *Barns Grand Teton: Grand Teton National Park kernel Spatial Color Coherence Neighborhood Difference Kernel functionConvolution *8-connected neighborhood Gaussian FunctionWeighted Histogram Saturation Value Kronecker Delta
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms ::Hue Histograms :: Spatial Color CoherenceSpatial Color Coherence *hue histogram, window size = 1x11 *Barns Grand Teton: Grand Teton National Park kernel Spatial Color Coherence Neighborhood Difference Kernel functionConvolution *8-connected neighborhood Gaussian FunctionWeighted Histogram Saturation Value Kronecker Delta *Spatial Color Coherence Map
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms :: The end of our jorney...Hue Histograms :: The end of our jorney... Simple Frequency By Contribution Weighted Contribution Hasan Weighted By Saturation Gaussian WeightedSmoothed A brief visualA brief visual comparison!comparison! This is the end!
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing ConclusionConclusion Use the appropriate space for your problem! Always! Hue based histograms can be employed in a wide range of applications! Color spaces that have hue separation approximate human perception! Some considerations should be taken into account in the construction of a hue histogram as brightness and perceptive contribution...
Federal University of Rio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Thanks for your attention!Thanks for your attention! Michel Alves dos SantosMichel Alves dos Santos References:References: Digital Image Processing (3rd Ed), Gonzalez & Woods, Pages 407-437. [GW'08] Blind Stain Decomposition for Histo-Pathology Images Using Circular Nature of Chroma Components, Li & Plataniotis, 2015, Page 2. [LP'15] Color Image Segmentation Using Acceptable Histogram Segmentation, Delon et al., 2005, LNCS. Shot Classification Using Domain Specific Features for Movie Management, Hasan et al., 2012, LNCS, Springer. [MAH'12] Contrast Enhancement of Color Images Based on Wavelet Transform and Human Visual System, 2007, Xiao & Ohya, IASTED. Progressive Histogram Reshaping for Creative Color Transfer and Tone Reproduction, Pouli & Reinhard, 2010, NPAR2010.

More Related Content

PPTX
What is Digital Morphing and Its Techniques
byAnimation Courses, Ahmedabad
 
PPTX
Computer Vision
byArtiKhanchandani
 
PPTX
a novel approach for breast cancer detection using data mining tool weka
byahmad abdelhafeez
 
PDF
Digital Image Fundamentals
byDr. A. B. Shinde
 
PPTX
RFID with INTERNET OF THINGS
byBino Mathew Varghese
 
PPT
Interlaced and progressive Camera
byVanya Valindria
 
PPTX
Image compression
byBassam Kanber
 
PPT
Spatial filtering
byshabanam tamboli
 
What is Digital Morphing and Its Techniques
byAnimation Courses, Ahmedabad
 
Computer Vision
byArtiKhanchandani
 
a novel approach for breast cancer detection using data mining tool weka
byahmad abdelhafeez
 
Digital Image Fundamentals
byDr. A. B. Shinde
 
RFID with INTERNET OF THINGS
byBino Mathew Varghese
 
Interlaced and progressive Camera
byVanya Valindria
 
Image compression
byBassam Kanber
 
Spatial filtering
byshabanam tamboli
 

What's hot

PDF
Similarity Maps Using SSIM Index
byMichel Alves
 
PDF
Privacy and ethical issues in Biometric Systems
byFrancesco Bonadiman
 
PDF
Elements of visual perception
byDr INBAMALAR T M
 
PDF
Computer Vision
byKan-Han (John) Lu
 
PPTX
Digital Video Recorders (DVR) For Smart Home Automation
bySmart Automation
 
PDF
Introduction to OpenCV
byLuigi De Russis
 
PPT
Histogram equalization
by11mr11mahesh
 
PPTX
Chapter 9 morphological image processing
byAhmed Daoud
 
PPT
Boundary respresentation and descriptors.ppt
byPriyadharsini R
 
PPT
Image formats
byIET DAVV Indore
 
PPTX
The Internet and Multimedia
byCeliaBSeaton
 
PPTX
Types of images
byNadia Fareed
 
PDF
digital image processing, image processing
byKalyan Acharjya
 
PPTX
Color models
byHaitham Ahmed
 
PPTX
Digital image processing
byABIRAMI M
 
PPTX
Rgb colour model
byAshek Shanto
 
PPT
Raster scan system
byMohd Arif
 
PPTX
Chapter 6 color image processing
byasodariyabhavesh
 
PPT
Sharpening using frequency Domain Filter
byarulraj121
 
PPT
SIFT
byNitin Ramchandani
 
Similarity Maps Using SSIM Index
byMichel Alves
 
Privacy and ethical issues in Biometric Systems
byFrancesco Bonadiman
 
Elements of visual perception
byDr INBAMALAR T M
 
Computer Vision
byKan-Han (John) Lu
 
Digital Video Recorders (DVR) For Smart Home Automation
bySmart Automation
 
Introduction to OpenCV
byLuigi De Russis
 
Histogram equalization
by11mr11mahesh
 
Chapter 9 morphological image processing
byAhmed Daoud
 
Boundary respresentation and descriptors.ppt
byPriyadharsini R
 
Image formats
byIET DAVV Indore
 
The Internet and Multimedia
byCeliaBSeaton
 
Types of images
byNadia Fareed
 
digital image processing, image processing
byKalyan Acharjya
 
Color models
byHaitham Ahmed
 
Digital image processing
byABIRAMI M
 
Rgb colour model
byAshek Shanto
 
Raster scan system
byMohd Arif
 
Chapter 6 color image processing
byasodariyabhavesh
 
Sharpening using frequency Domain Filter
byarulraj121
 
SIFT
byNitin Ramchandani
 

Similar to About Perception and Hue Histograms in HSV Space

PPTX
HSL & HSV colour models
byVishnu RC Vijayan
 
PDF
Color Harmonization - Results
byMichel Alves
 
PPTX
Computer graphics & image processing lecture notes
byTejaRamPooniya
 
PPTX
Color model in computer graphics
byPuja Dhakal
 
PPTX
introduction to colors in images and videos
bywasrse
 
PPTX
Color models
byMoahmed Sweelam
 
PPT
Lect07.ppt digital image processing for computer and eng student
bynoor769012
 
PPT
Color image processing presentation from start
byGMKosgiker
 
PPTX
Lecnoninecolorspacemodelindigitalimageprocess
byIrsaAamir
 
PPT
Introduction to Color Image Processing Color Image Processing
byAyushShukla430246
 
PPTX
Unit 5- Color Model COMPUTER GRAPHICS .pptx
byPraveen156918
 
PDF
Project report_DTRL_subrat
bySubrat Prasad
 
PDF
An investigation for steganography using different color system
byDr Amira Bibo
 
PDF
Color theorykareemebrahim
byKareem .
 
PDF
Color
byKANAIYABHATT
 
PDF
Displays and color system in computer graphics(Computer graphics tutorials)
byDaroko blog(www.professionalbloggertricks.com)
 
PDF
Hg2513121314
byIJERA Editor
 
PDF
Hg2513121314
byIJERA Editor
 
PDF
Welcome to International Journal of Engineering Research and Development (IJERD)
byIJERD Editor
 
PPTX
Colour%20Model%20new.pptx
byShreyasS211082
 
HSL & HSV colour models
byVishnu RC Vijayan
 
Color Harmonization - Results
byMichel Alves
 
Computer graphics & image processing lecture notes
byTejaRamPooniya
 
Color model in computer graphics
byPuja Dhakal
 
introduction to colors in images and videos
bywasrse
 
Color models
byMoahmed Sweelam
 
Lect07.ppt digital image processing for computer and eng student
bynoor769012
 
Color image processing presentation from start
byGMKosgiker
 
Lecnoninecolorspacemodelindigitalimageprocess
byIrsaAamir
 
Introduction to Color Image Processing Color Image Processing
byAyushShukla430246
 
Unit 5- Color Model COMPUTER GRAPHICS .pptx
byPraveen156918
 
Project report_DTRL_subrat
bySubrat Prasad
 
An investigation for steganography using different color system
byDr Amira Bibo
 
Color theorykareemebrahim
byKareem .
 
Color
byKANAIYABHATT
 
Displays and color system in computer graphics(Computer graphics tutorials)
byDaroko blog(www.professionalbloggertricks.com)
 
Hg2513121314
byIJERA Editor
 
Hg2513121314
byIJERA Editor
 
Welcome to International Journal of Engineering Research and Development (IJERD)
byIJERD Editor
 
Colour%20Model%20new.pptx
byShreyasS211082
 

More from Michel Alves

PDF
Introduction to Kernel Functions
byMichel Alves
 
PDF
Wave Simulation Using Perlin Noise
byMichel Alves
 
PDF
Month Presentations Schedule - March/2015 - LCG/UFRJ
byMichel Alves
 
PDF
Color Palettes in R
byMichel Alves
 
PDF
TMS - Schedule of Presentations and Reports
byMichel Alves
 
PDF
Qualifying Exam - Image-Based Reconstruction With Color Harmonization
byMichel Alves
 
PDF
Five Minute Speech: An Overview of Activities Developed in Disciplines and Gu...
byMichel Alves
 
PDF
Sigmoid Curve Erf
byMichel Alves
 
PDF
Triangle Plot
byMichel Alves
 
PDF
Capacity-Constrained Point Distributions :: Complementary Results
byMichel Alves
 
PDF
Capacity-Constrained Point Distributions
byMichel Alves
 
PDF
A Framework for Harmonic Color Measures
byMichel Alves
 
PDF
Texture Synthesis: An Approach Based on GPU Use
byMichel Alves
 
PDF
Intelligent Transfer of Thematic Harmonic Color Palettes
byMichel Alves
 
PDF
Effectiveness of Image Quality Assessment Indexes
byMichel Alves
 
PDF
Hue Wheel Prototype
byMichel Alves
 
PDF
Cosine Curve
byMichel Alves
 
PDF
Triangle Mesh Plot
byMichel Alves
 
PDF
Capacity-Constrained Point Distributions :: Video Slides
byMichel Alves
 
PDF
Capacity-Constrained Point Distributions :: Density Function Catalog
byMichel Alves
 
Introduction to Kernel Functions
byMichel Alves
 
Wave Simulation Using Perlin Noise
byMichel Alves
 
Month Presentations Schedule - March/2015 - LCG/UFRJ
byMichel Alves
 
Color Palettes in R
byMichel Alves
 
TMS - Schedule of Presentations and Reports
byMichel Alves
 
Qualifying Exam - Image-Based Reconstruction With Color Harmonization
byMichel Alves
 
Five Minute Speech: An Overview of Activities Developed in Disciplines and Gu...
byMichel Alves
 
Sigmoid Curve Erf
byMichel Alves
 
Triangle Plot
byMichel Alves
 
Capacity-Constrained Point Distributions :: Complementary Results
byMichel Alves
 
Capacity-Constrained Point Distributions
byMichel Alves
 
A Framework for Harmonic Color Measures
byMichel Alves
 
Texture Synthesis: An Approach Based on GPU Use
byMichel Alves
 
Intelligent Transfer of Thematic Harmonic Color Palettes
byMichel Alves
 
Effectiveness of Image Quality Assessment Indexes
byMichel Alves
 
Hue Wheel Prototype
byMichel Alves
 
Cosine Curve
byMichel Alves
 
Triangle Mesh Plot
byMichel Alves
 
Capacity-Constrained Point Distributions :: Video Slides
byMichel Alves
 
Capacity-Constrained Point Distributions :: Density Function Catalog
byMichel Alves
 

Recently uploaded

PDF
The Tale of Melon City poem ppt by Sahasra
bybitrasahasra
 
PPTX
3 G8_Q3_L3_ (Cartoon as Representation in Opinion Editorial Article).pptx
byNorafeSahagun
 
PPTX
Basics in Phytochemistry, Extraction, Isolation methods, Characterisation etc.
byD. Y. Patil College of Pharmacy, Kolhapur.
 
PDF
Scalable-MADDPG-Based Cooperative Target Invasion for a Multi-USV System.pdf
byMan_Ebook
 
PDF
DHA/HAAD/MOH/DOH OPTOMETRY MCQ PYQ. .pdf
byAnmol Singh
 
PDF
Micro Economics for class 12 and class 11
bysurajbajaj4116
 
PDF
Types of eggs and Egg membranes (Developmental Zoology)
bySudhandraKarthi
 
PDF
Biology Practical Class 12th 2025 PDF(2)-2-52.pdf
bySCPRPWomenCollegeChi
 
PPTX
Nursing Unit Management, patient care unit, physical layout of nursing unit,t...
byyellow4878
 
PDF
Multiple Myeloma , definition, etiology, PP, CM , DE and management
byNisha Borsa
 
PPTX
4 G8_Q3_L4 (Evaluating opinion editorials for textual evidence and quality).pptx
byNorafeSahagun
 
PDF
Blood Group Incompatibility: Rh Factor and Erythroblastosis Fetalis
bySudhandraKarthi
 
PPTX
How to Create Lead_Opportunity From Odoo 18 Website
byCeline George
 
PPTX
Details of Epithelial and Connective Tissue.pptx
byAshish Umale
 
PPTX
Steve Hale - Developing Elite Young Goalkeepers 2024.pptx
bypjmfd
 
PPTX
Accounting Skills Paper-II (Registers of PACs and Credit Co-operative Societies)
byDr. Sushil Bansode
 
PPTX
Expected Revenue Report In Odoo 18 CRM
byCeline George
 
PPTX
Access partner report in Odoo 18.2 _ Odoo 19
byCeline George
 
PPTX
Partial Correlation - Values of r₁₂.₃, r₂₃.₁ & r₁₃.₂ r₁₂, r₁₃ and r₂₃
bySundar B N
 
PDF
Cultivating Greatness Pune's Best Preschools and Schools.pdf
byWellington College
 
The Tale of Melon City poem ppt by Sahasra
bybitrasahasra
 
3 G8_Q3_L3_ (Cartoon as Representation in Opinion Editorial Article).pptx
byNorafeSahagun
 
Basics in Phytochemistry, Extraction, Isolation methods, Characterisation etc.
byD. Y. Patil College of Pharmacy, Kolhapur.
 
Scalable-MADDPG-Based Cooperative Target Invasion for a Multi-USV System.pdf
byMan_Ebook
 
DHA/HAAD/MOH/DOH OPTOMETRY MCQ PYQ. .pdf
byAnmol Singh
 
Micro Economics for class 12 and class 11
bysurajbajaj4116
 
Types of eggs and Egg membranes (Developmental Zoology)
bySudhandraKarthi
 
Biology Practical Class 12th 2025 PDF(2)-2-52.pdf
bySCPRPWomenCollegeChi
 
Nursing Unit Management, patient care unit, physical layout of nursing unit,t...
byyellow4878
 
Multiple Myeloma , definition, etiology, PP, CM , DE and management
byNisha Borsa
 
4 G8_Q3_L4 (Evaluating opinion editorials for textual evidence and quality).pptx
byNorafeSahagun
 
Blood Group Incompatibility: Rh Factor and Erythroblastosis Fetalis
bySudhandraKarthi
 
How to Create Lead_Opportunity From Odoo 18 Website
byCeline George
 
Details of Epithelial and Connective Tissue.pptx
byAshish Umale
 
Steve Hale - Developing Elite Young Goalkeepers 2024.pptx
bypjmfd
 
Accounting Skills Paper-II (Registers of PACs and Credit Co-operative Societies)
byDr. Sushil Bansode
 
Expected Revenue Report In Odoo 18 CRM
byCeline George
 
Access partner report in Odoo 18.2 _ Odoo 19
byCeline George
 
Partial Correlation - Values of r₁₂.₃, r₂₃.₁ & r₁₃.₂ r₁₂, r₁₃ and r₂₃
bySundar B N
 
Cultivating Greatness Pune's Best Preschools and Schools.pdf
byWellington College
 
In this document
Powered by AI

Introduction to color theory focusing on hue, saturation, and brightness in images.

Analysis of energy distribution in RGB and HSV color spaces; highlights differences.

Explanation of RGB to HSV transformations and implications for pixel representation.

Comparison of ease in detecting yellow hues in RGB vs. HSV color spaces; method of segmentation.

Visual perception of colors in images; questions regarding hue distribution.

Discussion of channel energy and its effect on color vibrancy and brightness.

Methods for constructing hue histograms based on discrete positions and actual pixel data.

Different methods of integrating saturation into hue histogram calculations.

Various smoothing techniques applied to histograms, including Gaussian and Box smoothing.

Introduction of spatial coherence in hue histograms and methods for neighborhood analysis.

Summary of histogram methodologies using various strategies for hue data interpretation.

Final thoughts on hue-based histogram applications and considerations for constructions.

Thanking the audience and referencing key literature used in the presentation.

About Perception and Hue Histograms in HSV Space

  • 1.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing About Perception and HueAbout Perception and Hue Histograms in HSV SpaceHistograms in HSV Space Michel Alves dos Santos May, 2015 *original *hue-saturation projection *saturation *brightness *hue histogram
  • 2.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing IntroductionIntroduction red channel green channel blue channel What's your perception about the colors of this image? *Barns Grand Teton: Grand Teton National Park Note the marked areas! And the distribution by channel? How each color component behaves in its proper channel?
  • 3.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing IntroductionIntroduction*Barns Grand Teton: Grand Teton National Park Observe the distribution of energy for each channel: But, about the hues? What the RGB model can tell us? This kind of graph shows us how the energy of each channel is distributed! red channel green channel blue channel
  • 4.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing IntroductionIntroduction*Barns Grand Teton: Grand Teton National Park Firstly, we will use the HSV Color Space ... How to build a hue histogram? Now, note the diagram below: Can you identify hues distinctly? Probably not! Because of clusters and the intersection of colors! A histogram of hues can help us improve our perception!
  • 5.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing RGB Vs HSVRGB Vs HSV (Color Spaces)(Color Spaces) RGB Color Space HSV Color Space *Solids produced using POV­Ray [http://lib.povray.org/] Simplicity in representation and storage Close to human perception Some point operations are faster... Easy interpolation between colors Invariant to illumination transformsHave lighting and color properties togetherHave lighting and color properties together
  • 6.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing RGB Vs HSVRGB Vs HSV (Color Spaces – a common mistake...)(Color Spaces – a common mistake...) RGB Color Space HSV Color Space *Solids produced using POV­Ray [http://lib.povray.org/] A cone is commonly adopted but cylindrical representation is more mathematically accurate.
  • 7.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing RGB Vs HSVRGB Vs HSV (Color Spaces – Solids Transition)(Color Spaces – Solids Transition) RGB Color Space HSV Color Space *Solids produced using POV­Ray [http://lib.povray.org/]
  • 8.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing RGB Vs HSVRGB Vs HSV (Transformation)(Transformation) RGB HSV Transformation isn't linear! Some care should be taken with monochromatic pixels! *[avoid divisions by zero]
  • 9.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing RGB Vs HSVRGB Vs HSV (Transformation)(Transformation) RGB HSV Transformation isn't linear! Alternative Some care should be taken with monochromatic pixels! *[avoid divisions by zero]
  • 10.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing RGB Vs HSVRGB Vs HSV (Color Image Thresholding)(Color Image Thresholding) Find the yellow M&M's! A simple task for a human observer, but not so easy for machines: Complexity depends of the space! Using RGB: R: G: B: 200 255 200 255 0 50 Using HSV:(3 intervals) (1 interval)
  • 11.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing RGB Vs HSVRGB Vs HSV (Color Image Thresholding)(Color Image Thresholding) Find the yellow M&M's! A simple task for a human observer, but not so easy for machines: Complexity depends of the space! Using RGB: R: G: B: 200 255 200 255 0 50 Using HSV:(3 intervals) (1 interval) [This approach is independent of saturation or brightness]
  • 12.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing *Barns Grand Teton: Grand Teton National Park RGB Vs HSVRGB Vs HSV (Color Image Thresholding)(Color Image Thresholding) *hues of sky *hues of barn *hues of grass Using this feature some tasks can be easily performed! As detection of regions or objects by its characteristic colors! It's one of the bases of color perception!
  • 13.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing RGB Vs HSVRGB Vs HSV (Color Perception)(Color Perception) And now, what's your perception about the colors of this image? *Barns Grand Teton: Grand Teton National Park Where we have more blue hues? Where we have more orange hues? Where we have more green hues? Here we have a blend of yellow and green hues! Do not fool yourself! (Grass???) (Sky) (Barn) *hue histogram *hue projection
  • 14.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing RGB Vs HSVRGB Vs HSV (Color Perception)(Color Perception) And now, what's your perception about the colors of this image? *Barns Grand Teton: Grand Teton National Park Where we have more blue hues? Where we have more orange hues? Where we have more green hues? Here we have a blend of yellow and green hues! Do not fool yourself! (Grass???) (Sky) (Barn) *hue histogram *hue projection
  • 15.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing RGB Vs HSVRGB Vs HSV (Meanings of the Components)(Meanings of the Components) Energy of red channel Energy of green channel Energy of blue channel What is the basic color? How vibrant is the color? How brightness is the color?
  • 16.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue HistogramsHue Histograms *hue projection *saturation *value We will build our histograms taking account the number of positions of the hue circle! Number of bins (discrete positions): 0..360 or 0 to 2π Note that the hue channel is a ring structure!
  • 17.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms - StepsHue Histograms - Steps Our input images are in RGB Color Space, the output is a transformed hue histogram... We are applying a square root transformation to obtain the final hue histogram... Observe the follow diagram! The metric of contribution is a flexible part of the process and depends of application...
  • 18.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms - StepsHue Histograms - Steps Our input images are in RGB Color Space, the output is a transformed hue histogram... We are applying a square root transformation to obtain the final hue histogram... Observe the follow diagram! The metric of contribution is a flexible part of the process and depends of application... Get to work! Now, I will show some metrics!
  • 19.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms :: Simple FrequencyHue Histograms :: Simple Frequency*Barns Grand Teton: Grand Teton National Park Kronecker Delta Hue Picture or Image *hue histogram This is a simple counting! It doesn't consider other HSV channels. Bin Position PixelHistogram Notation
  • 20.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms :: by SaturationHue Histograms :: by Saturation*Barns Grand Teton: Grand Teton National Park *hue histogram Kronecker Delta Hue Picture Only considers the saturation channel... Saturation Ref: [LP'15] Bin Position PixelHistogram
  • 21.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms :: by ContributionHue Histograms :: by Contribution*Barns Grand Teton: Grand Teton National Park *hue histogram Kronecker DeltaSaturation ValuePicture Hue Histogram Pixel Bin Position
  • 22.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms ::Hue Histograms :: Weighted by ContributionWeighted by Contribution *Barns Grand Teton: Grand Teton National Park *hue histogram Kronecker DeltaSaturation ValuePicture Hue *similar to the previous! Normalization Factor Bin Position Pixel
  • 23.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms :: Hasan WeightedHue Histograms :: Hasan Weighted Ref: [MAH'12] *hue histogram *Barns Grand Teton: Grand Teton National Park Picture Previous Histogram *exponential weighted histogram Mean of Hues *similar to the previous??? Mean Variance Variance of Hues Notation Weighted Histogram Bin Position
  • 24.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms :: Hasan WeightedHue Histograms :: Hasan Weighted Ref: [MAH'12] *hue histogram *Barns Grand Teton: Grand Teton National Park Picture Previous Histogram *exponential weighted histogram Mean of Hues *similar to the previous??? Variance of Hues *before weighting *after weighting frequency frequencyhue hue Weighted Histogram Bin Position
  • 25.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms :: Gaussian WeightedHue Histograms :: Gaussian Weighted Gaussian Function *Barns Grand Teton: Grand Teton National Park *hue histogram Picture Previous Histogram Weighted Histogram Bin Position Mean of Hues Variance of Hues
  • 26.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms ::Hue Histograms :: Smoothed by BoxSmoothed by Box *hue histogram, window size = 1x9 *Barns Grand Teton: Grand Teton National Park Box function Convolution Gaussian Function Previous HistogramWeighted Histogram
  • 27.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms ::Hue Histograms :: Smoothed by BoxSmoothed by Box *hue histogram, window size = 1x9 *Barns Grand Teton: Grand Teton National Park Box function Convolution Gaussian Function Previous HistogramWeighted Histogram *smoothing employing a boxcar function
  • 28.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms ::Hue Histograms :: Smoothed by GaussianSmoothed by Gaussian *hue histogram, window size = 1x9 *Barns Grand Teton: Grand Teton National Park Gaussian function Convolution Gaussian Function Previous HistogramWeighted Histogram
  • 29.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms ::Hue Histograms :: Smoothed by a KernelSmoothed by a Kernel *hue histogram, window size = 1x11 *Barns Grand Teton: Grand Teton National Park kernel Kernel function Convolution Gaussian Function Previous HistogramWeighted Histogram
  • 30.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms ::Hue Histograms :: Smoothed by a KernelSmoothed by a Kernel *hue histogram, window size = 1x11 *Barns Grand Teton: Grand Teton National Park kernel function employed: Epanechnikov kernel Kernel function Convolution Gaussian Function Previous HistogramWeighted Histogram
  • 31.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms ::Hue Histograms :: Spatial Color CoherenceSpatial Color Coherence *hue histogram, window size = 1x11 *Barns Grand Teton: Grand Teton National Park kernel Spatial Color Coherence Neighborhood Difference Kernel functionConvolution *8-connected neighborhood Gaussian FunctionWeighted Histogram Saturation Value Kronecker Delta
  • 32.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms ::Hue Histograms :: Spatial Color CoherenceSpatial Color Coherence *hue histogram, window size = 1x11 *Barns Grand Teton: Grand Teton National Park kernel Spatial Color Coherence Neighborhood Difference Kernel functionConvolution *8-connected neighborhood Gaussian FunctionWeighted Histogram Saturation Value Kronecker Delta *Spatial Color Coherence Map
  • 33.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Hue Histograms :: The end of our jorney...Hue Histograms :: The end of our jorney... Simple Frequency By Contribution Weighted Contribution Hasan Weighted By Saturation Gaussian WeightedSmoothed A brief visualA brief visual comparison!comparison! This is the end!
  • 34.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing ConclusionConclusion Use the appropriate space for your problem! Always! Hue based histograms can be employed in a wide range of applications! Color spaces that have hue separation approximate human perception! Some considerations should be taken into account in the construction of a hue histogram as brightness and perceptive contribution...
  • 35.
    Federal University ofRio de Janeiro (UFRJ) :: Campus Cidade Universitária :: Rio de Janeiro :: Fundão Island :: COPPE/PESC/Laboratory of Computer Graphics :: March/2015 Michel Alves -- Five Minute Speech (FMS) :: Overview of Activities Developed in Disciplines and Guided Studies :: Graduate Program in Systems Engineering and Computing Thanks for your attention!Thanks for your attention! Michel Alves dos SantosMichel Alves dos Santos References:References: Digital Image Processing (3rd Ed), Gonzalez & Woods, Pages 407-437. [GW'08] Blind Stain Decomposition for Histo-Pathology Images Using Circular Nature of Chroma Components, Li & Plataniotis, 2015, Page 2. [LP'15] Color Image Segmentation Using Acceptable Histogram Segmentation, Delon et al., 2005, LNCS. Shot Classification Using Domain Specific Features for Movie Management, Hasan et al., 2012, LNCS, Springer. [MAH'12] Contrast Enhancement of Color Images Based on Wavelet Transform and Human Visual System, 2007, Xiao & Ohya, IASTED. Progressive Histogram Reshaping for Creative Color Transfer and Tone Reproduction, Pouli & Reinhard, 2010, NPAR2010.