Direct Volume Rendering (DVR) uses a technique called ray-casting to render 3D volumetric data without converting it to surface geometry. Ray-casting works by casting rays from the viewpoint into the volume and sampling/compositing values along the ray. Rays are cast through the volume, sampling values at intervals using interpolation. Samples are shaded and composited based on classification and lighting. This results in the final color value for each pixel. Ray-casting provides an efficient way to render volumetric data and visualize features of interest.
Volume rendering 3D volume data (medical CT scans) in Unity3D.
Covering the following topics:
- Raymarching
- Maximum Intensity Projection
- Direct Volume Rendering with compositing
- Isosurface rendering
- Transfer functions
- 2D Transfer Functions
- Slice rendering
Source code here: https://github.com/mlavik1/UnityVolumeRendering
Digital images can be summarized in 3 sentences or less:
Digital images have spatial resolution determined by the number of pixels, brightness resolution represented by the number of gray levels, and color resolution defined by the number of color samples. The human vision system perceives light and color based on the wavelength and can adapt to large intensity ranges through brightness adaptation. Objective image quality is measured by metrics like peak signal-to-noise ratio while subjective quality depends on human perception and visual illusions.
This document provides an overview of ray tracing techniques for computer graphics rendering. It discusses the basic ray tracing algorithm and how it traces the path of light rays in a scene. It covers key concepts like backward ray tracing, shadow rays, reflection rays, refraction, and the basic steps of a ray tracing program. It also provides an example of how to render a sphere using ray tracing by tracing rays from the camera through the image plane and calculating intersections with objects to determine colors.
Digital image processing involves algorithms for transforming digital images. It has many applications including gamma-ray imaging, x-ray imaging, and imaging in visible and infrared bands. In gamma-ray imaging, radioactive isotopes administered to patients emit gamma rays that are detected by sensors to identify tumors. In visible and infrared imaging, examples include using microscopes to examine pharmaceuticals and materials.
This document summarizes illumination models used in computer graphics. It describes the local illumination or Phong model which focuses on direct light impact. It works by modeling diffuse and specular reflection. The document also covers the global illumination or ray tracing model which simulates indirect light through reflection and refraction. Ray tracing is more accurate but computationally expensive. Applications discussed include environment mapping, soft shadows, blurry reflection, and motion blur. The document notes disadvantages of both models like performance issues for Phong shading and aliasing for ray tracing.
- The lecture covered lighting surfaces in computer graphics, specifically how light interacts with visible surfaces through illumination models like ambient, diffuse, and specular lighting.
- Assignments were given including turning in Homework #3, an upcoming Homework #4, and Project #2 on texturing, shading, and lighting due after Spring Break.
- A midterm exam was announced for March 8th and office hours were provided for questions.
- Electromagnetic waves include visible light and can travel through a vacuum. They are transverse waves that were created by Maxwell and travel at the speed of light.
- The visible spectrum ranges from red to violet. Red has the lowest frequency and longest wavelength while violet has the highest frequency and shortest wavelength.
- EM waves can be transmitted, absorbed, scattered or dispersed depending on their frequency and the substance they encounter. They also decrease in intensity with the inverse square of the distance from the source.
Volume rendering 3D volume data (medical CT scans) in Unity3D.
Covering the following topics:
- Raymarching
- Maximum Intensity Projection
- Direct Volume Rendering with compositing
- Isosurface rendering
- Transfer functions
- 2D Transfer Functions
- Slice rendering
Source code here: https://github.com/mlavik1/UnityVolumeRendering
Digital images can be summarized in 3 sentences or less:
Digital images have spatial resolution determined by the number of pixels, brightness resolution represented by the number of gray levels, and color resolution defined by the number of color samples. The human vision system perceives light and color based on the wavelength and can adapt to large intensity ranges through brightness adaptation. Objective image quality is measured by metrics like peak signal-to-noise ratio while subjective quality depends on human perception and visual illusions.
This document provides an overview of ray tracing techniques for computer graphics rendering. It discusses the basic ray tracing algorithm and how it traces the path of light rays in a scene. It covers key concepts like backward ray tracing, shadow rays, reflection rays, refraction, and the basic steps of a ray tracing program. It also provides an example of how to render a sphere using ray tracing by tracing rays from the camera through the image plane and calculating intersections with objects to determine colors.
Digital image processing involves algorithms for transforming digital images. It has many applications including gamma-ray imaging, x-ray imaging, and imaging in visible and infrared bands. In gamma-ray imaging, radioactive isotopes administered to patients emit gamma rays that are detected by sensors to identify tumors. In visible and infrared imaging, examples include using microscopes to examine pharmaceuticals and materials.
This document summarizes illumination models used in computer graphics. It describes the local illumination or Phong model which focuses on direct light impact. It works by modeling diffuse and specular reflection. The document also covers the global illumination or ray tracing model which simulates indirect light through reflection and refraction. Ray tracing is more accurate but computationally expensive. Applications discussed include environment mapping, soft shadows, blurry reflection, and motion blur. The document notes disadvantages of both models like performance issues for Phong shading and aliasing for ray tracing.
- The lecture covered lighting surfaces in computer graphics, specifically how light interacts with visible surfaces through illumination models like ambient, diffuse, and specular lighting.
- Assignments were given including turning in Homework #3, an upcoming Homework #4, and Project #2 on texturing, shading, and lighting due after Spring Break.
- A midterm exam was announced for March 8th and office hours were provided for questions.
- Electromagnetic waves include visible light and can travel through a vacuum. They are transverse waves that were created by Maxwell and travel at the speed of light.
- The visible spectrum ranges from red to violet. Red has the lowest frequency and longest wavelength while violet has the highest frequency and shortest wavelength.
- EM waves can be transmitted, absorbed, scattered or dispersed depending on their frequency and the substance they encounter. They also decrease in intensity with the inverse square of the distance from the source.
The document contains announcements and instructions for an assignment in a computer graphics course. It discusses file formats for outputting images, implementing ray casting and ray tracing, and transforming objects through translation, rotation and scaling. It also covers generating shadow rays, reflection and refraction. Transforming rays through inverse transforms allows intersecting rays with canonical objects to determine scene intersections.
Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamen
The document discusses light and perception. It begins by introducing photometric stereo, which uses pixel brightness to understand shape. It then covers topics like what light is, how we measure and perceive it, how light propagates and interacts with matter. Key points covered include how the human visual system perceives color using rods and cones, properties of light like reflection, challenges of modeling image formation by tracking light rays, and assumptions needed for shape from shading from a single image.
Introduction to Colorimetry and basics.ppt.pptxSheelaS18
Colorimetry uses the human eye to determine the concentration of colored species, while spectrophotometry uses instruments to make the same measurements over a wider range. This experiment demonstrates both techniques on dyes, using visual observations and a spectrophotometer. Absorbance measurements from the spectrophotometer are plotted versus wavelength to identify dyes. Colorimetry and spectrophotometry rely on the fact that compounds absorb complementary colors of light.
Lecture 9&10 computer vision segmentation-no_taskcairo university
This document provides information about computer vision and image segmentation techniques taught in an SBE 404 course. It includes the course professor and TAs' contact information. It then discusses various image segmentation methods like thresholding, region growing, and split and merge techniques. Thresholding methods covered include optimal thresholding, Otsu's method, and handling non-uniform illumination. Region growing and problems with the approach are also summarized.
CSE5559::Visualizing the Life and Anatomy of Cosmic ParticlesSubhashis Hazarika
This document discusses visualizing the evolution and internal structure of cosmic particle halos over time through three main tasks:
1) Visualizing the evolution of halos and the highest mass halo over time and its internal structure.
2) Providing a grid-based representation of dark matter particles and a particle-based volume rendering framework to visualize the particle layout.
3) Analyzing the mass accrual pattern of the highest mass halo using a virial mass estimation theorem and plotting the contribution of dark matter particles to the halo's mass over time.
ABSTRACT
Medical images are pictures of distributions of physical attributes captured by an image acquisition system. Most of today’s images are digital. They may be post processed for analysis by a computer-assisted method. Edges are important features in an image. Edge detection extracts salient features from an image such as corners, lines and curves. These features are used by higher level computer vision algorithms. Segmentation plays a crucial role in extraction of useful information and attributes from medical images. Different edge detection methods are applied on dental images. It is implemented using MATLAB.
Keywords – Edge Detection, Dental Image, Canny
This document discusses fundamentals of imaging and image processing. It describes features of human vision including the retina, cones, and rods. Cones are sensitive to color while rods provide a general picture. Images are formed in the eye based on the height and focal length. The human visual system can adapt to a wide range of light intensities but can only perceive a small sub-range at a time. Electromagnetic waves carry energy proportional to their frequency. Digital images are discrete functions defined over a spatial domain with intensity values. Image formation depends on illumination and reflectance. Sampling digitizes spatial coordinates while quantization digitizes intensities into discrete levels. The sampling theorem establishes that a signal can be reconstructed from samples if the sampling rate exceeds
What is global illumination and what are the techniques used to combat this problem in real-time applications. Talk briefly covers algorithms like instant radiosity, light propagation volumes and voxel cone tracing. Additional details within the slide notes.
The document provides a history of the development of television technology from the late 1800s through the 1920s. Some key developments include:
- In 1873, experiments with selenium, which is light-sensitive and formed the basis for early televisions.
- In 1884, the Nipkow disk laid down many basic concepts like scanning and synchronization.
- In 1923, Vladimir Zworykin developed the Kinescope, which allowed television programs to be recorded on film.
- In 1924, John Logie Baird transmitted the first television image.
- In 1925, Vladimir Zworykin demonstrated 60-line television using a curved-line image structure typical of mechanical television at the time.
Light travels as waves in the electromagnetic spectrum at different wavelengths. It travels fastest in a vacuum at 300,000 km/s and slower in other materials. Light interacts with objects by being absorbed, reflected, or transmitted. The wavelength of visible light is between 400-700 nm. Color is determined by the wavelengths of light reflected or emitted from an object. Reflection can be regular from smooth surfaces or diffuse from rough surfaces. Refraction occurs when light changes speed as it passes through different materials due to atomic interactions. Lenses and prisms can bend light through refraction and dispersion. Lasers emit coherent, monochromatic light that is used for applications like welding and fiber optics.
Light travels as waves in the electromagnetic spectrum at different wavelengths. It travels fastest in a vacuum at 300,000 km/s and slower in other materials. Light interacts with objects by being absorbed, reflected, or transmitted. The wavelength of visible light is between 400-700 nm. Color is determined by the wavelengths of light reflected from an object. Monitors produce color using red, green and blue light while objects use pigments that absorb certain wavelengths. Reflection and refraction of light can be regular, diffuse, or involve total internal reflection as in fiber optics. Lasers produce coherent light of one wavelength.
This document discusses various lighting and shading techniques used in computer graphics, including:
- Ray tracing and radiosity methods that aim to approximate physical light behavior more accurately but with higher computational cost.
- Phong illumination model that provides relatively fast approximations of light interactions.
- Calculation of diffuse and specular reflection components in the Phong model based on surface normals, light direction, and view direction.
- Different shading techniques like flat, Gouraud, and Phong shading that determine color values at polygon vertices and faces.
An image texture is a set of metrics calculated in image processing designed to quantify the perceived texture of an image. Image Texture gives us information about the spatial arrangement of color or intensities in an image or selected region of an image. This presentation consists of its types, uses, methods and approaches.
This document describes the concept of dual photography, which uses Helmholtz reciprocity to interchange lights and cameras in a scene. It discusses how the transposed transport matrix can be used to generate virtual captured images from virtual projected patterns. It also describes different methods used to capture the transport matrix, including fixed pattern scanning and adaptive multiplexed illumination. Limitations discussed include scenes with significant global illumination effects and situations where the camera and projector are at a large angle.
This document contains a question bank for the course EC2029 Digital Image Processing. It includes questions about key concepts in digital image processing such as defining images, pixels, brightness, color models, resolutions, transforms, and enhancement techniques. Specifically, it provides definitions for terms like grayscale, dynamic range, quantization, and color models. It also lists steps in digital image processing and properties of transforms like the Fourier and discrete cosine transforms.
Ray tracing is a technique for rendering images that simulates the physical behavior of light. It involves tracing the path of light as it interacts with virtual objects in a simulated scene. The key aspects of ray tracing include modeling reflection, refraction, color intensity and shadows produced by light sources. It produces highly realistic images but can be computationally expensive compared to other rendering methods.
This document provides an overview of key concepts in digital image fundamentals. It discusses the human visual system and image formation in the eye. It also covers image acquisition, sampling, quantization, and representation. Additionally, it defines concepts like spatial and intensity resolution and describes basic image processing operations and transforms. The goal is to introduce fundamental digital image processing concepts.
Presentation of IEEE Slovenia CIS (Computational Intelligence Society) Chapte...University of Maribor
Slides from talk presenting:
Aleš Zamuda: Presentation of IEEE Slovenia CIS (Computational Intelligence Society) Chapter and Networking.
Presentation at IcETRAN 2024 session:
"Inter-Society Networking Panel GRSS/MTT-S/CIS
Panel Session: Promoting Connection and Cooperation"
IEEE Slovenia GRSS
IEEE Serbia and Montenegro MTT-S
IEEE Slovenia CIS
11TH INTERNATIONAL CONFERENCE ON ELECTRICAL, ELECTRONIC AND COMPUTING ENGINEERING
3-6 June 2024, Niš, Serbia
The document contains announcements and instructions for an assignment in a computer graphics course. It discusses file formats for outputting images, implementing ray casting and ray tracing, and transforming objects through translation, rotation and scaling. It also covers generating shadow rays, reflection and refraction. Transforming rays through inverse transforms allows intersecting rays with canonical objects to determine scene intersections.
Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamentals are accumulated at one place for easy understanding to a layman also in this presentation. Digital image Processing fundamen
The document discusses light and perception. It begins by introducing photometric stereo, which uses pixel brightness to understand shape. It then covers topics like what light is, how we measure and perceive it, how light propagates and interacts with matter. Key points covered include how the human visual system perceives color using rods and cones, properties of light like reflection, challenges of modeling image formation by tracking light rays, and assumptions needed for shape from shading from a single image.
Introduction to Colorimetry and basics.ppt.pptxSheelaS18
Colorimetry uses the human eye to determine the concentration of colored species, while spectrophotometry uses instruments to make the same measurements over a wider range. This experiment demonstrates both techniques on dyes, using visual observations and a spectrophotometer. Absorbance measurements from the spectrophotometer are plotted versus wavelength to identify dyes. Colorimetry and spectrophotometry rely on the fact that compounds absorb complementary colors of light.
Lecture 9&10 computer vision segmentation-no_taskcairo university
This document provides information about computer vision and image segmentation techniques taught in an SBE 404 course. It includes the course professor and TAs' contact information. It then discusses various image segmentation methods like thresholding, region growing, and split and merge techniques. Thresholding methods covered include optimal thresholding, Otsu's method, and handling non-uniform illumination. Region growing and problems with the approach are also summarized.
CSE5559::Visualizing the Life and Anatomy of Cosmic ParticlesSubhashis Hazarika
This document discusses visualizing the evolution and internal structure of cosmic particle halos over time through three main tasks:
1) Visualizing the evolution of halos and the highest mass halo over time and its internal structure.
2) Providing a grid-based representation of dark matter particles and a particle-based volume rendering framework to visualize the particle layout.
3) Analyzing the mass accrual pattern of the highest mass halo using a virial mass estimation theorem and plotting the contribution of dark matter particles to the halo's mass over time.
ABSTRACT
Medical images are pictures of distributions of physical attributes captured by an image acquisition system. Most of today’s images are digital. They may be post processed for analysis by a computer-assisted method. Edges are important features in an image. Edge detection extracts salient features from an image such as corners, lines and curves. These features are used by higher level computer vision algorithms. Segmentation plays a crucial role in extraction of useful information and attributes from medical images. Different edge detection methods are applied on dental images. It is implemented using MATLAB.
Keywords – Edge Detection, Dental Image, Canny
This document discusses fundamentals of imaging and image processing. It describes features of human vision including the retina, cones, and rods. Cones are sensitive to color while rods provide a general picture. Images are formed in the eye based on the height and focal length. The human visual system can adapt to a wide range of light intensities but can only perceive a small sub-range at a time. Electromagnetic waves carry energy proportional to their frequency. Digital images are discrete functions defined over a spatial domain with intensity values. Image formation depends on illumination and reflectance. Sampling digitizes spatial coordinates while quantization digitizes intensities into discrete levels. The sampling theorem establishes that a signal can be reconstructed from samples if the sampling rate exceeds
What is global illumination and what are the techniques used to combat this problem in real-time applications. Talk briefly covers algorithms like instant radiosity, light propagation volumes and voxel cone tracing. Additional details within the slide notes.
The document provides a history of the development of television technology from the late 1800s through the 1920s. Some key developments include:
- In 1873, experiments with selenium, which is light-sensitive and formed the basis for early televisions.
- In 1884, the Nipkow disk laid down many basic concepts like scanning and synchronization.
- In 1923, Vladimir Zworykin developed the Kinescope, which allowed television programs to be recorded on film.
- In 1924, John Logie Baird transmitted the first television image.
- In 1925, Vladimir Zworykin demonstrated 60-line television using a curved-line image structure typical of mechanical television at the time.
Light travels as waves in the electromagnetic spectrum at different wavelengths. It travels fastest in a vacuum at 300,000 km/s and slower in other materials. Light interacts with objects by being absorbed, reflected, or transmitted. The wavelength of visible light is between 400-700 nm. Color is determined by the wavelengths of light reflected or emitted from an object. Reflection can be regular from smooth surfaces or diffuse from rough surfaces. Refraction occurs when light changes speed as it passes through different materials due to atomic interactions. Lenses and prisms can bend light through refraction and dispersion. Lasers emit coherent, monochromatic light that is used for applications like welding and fiber optics.
Light travels as waves in the electromagnetic spectrum at different wavelengths. It travels fastest in a vacuum at 300,000 km/s and slower in other materials. Light interacts with objects by being absorbed, reflected, or transmitted. The wavelength of visible light is between 400-700 nm. Color is determined by the wavelengths of light reflected from an object. Monitors produce color using red, green and blue light while objects use pigments that absorb certain wavelengths. Reflection and refraction of light can be regular, diffuse, or involve total internal reflection as in fiber optics. Lasers produce coherent light of one wavelength.
This document discusses various lighting and shading techniques used in computer graphics, including:
- Ray tracing and radiosity methods that aim to approximate physical light behavior more accurately but with higher computational cost.
- Phong illumination model that provides relatively fast approximations of light interactions.
- Calculation of diffuse and specular reflection components in the Phong model based on surface normals, light direction, and view direction.
- Different shading techniques like flat, Gouraud, and Phong shading that determine color values at polygon vertices and faces.
An image texture is a set of metrics calculated in image processing designed to quantify the perceived texture of an image. Image Texture gives us information about the spatial arrangement of color or intensities in an image or selected region of an image. This presentation consists of its types, uses, methods and approaches.
This document describes the concept of dual photography, which uses Helmholtz reciprocity to interchange lights and cameras in a scene. It discusses how the transposed transport matrix can be used to generate virtual captured images from virtual projected patterns. It also describes different methods used to capture the transport matrix, including fixed pattern scanning and adaptive multiplexed illumination. Limitations discussed include scenes with significant global illumination effects and situations where the camera and projector are at a large angle.
This document contains a question bank for the course EC2029 Digital Image Processing. It includes questions about key concepts in digital image processing such as defining images, pixels, brightness, color models, resolutions, transforms, and enhancement techniques. Specifically, it provides definitions for terms like grayscale, dynamic range, quantization, and color models. It also lists steps in digital image processing and properties of transforms like the Fourier and discrete cosine transforms.
Ray tracing is a technique for rendering images that simulates the physical behavior of light. It involves tracing the path of light as it interacts with virtual objects in a simulated scene. The key aspects of ray tracing include modeling reflection, refraction, color intensity and shadows produced by light sources. It produces highly realistic images but can be computationally expensive compared to other rendering methods.
This document provides an overview of key concepts in digital image fundamentals. It discusses the human visual system and image formation in the eye. It also covers image acquisition, sampling, quantization, and representation. Additionally, it defines concepts like spatial and intensity resolution and describes basic image processing operations and transforms. The goal is to introduce fundamental digital image processing concepts.
Similar to Direct Volume Rendering (DVR): Ray-casting (20)
Presentation of IEEE Slovenia CIS (Computational Intelligence Society) Chapte...University of Maribor
Slides from talk presenting:
Aleš Zamuda: Presentation of IEEE Slovenia CIS (Computational Intelligence Society) Chapter and Networking.
Presentation at IcETRAN 2024 session:
"Inter-Society Networking Panel GRSS/MTT-S/CIS
Panel Session: Promoting Connection and Cooperation"
IEEE Slovenia GRSS
IEEE Serbia and Montenegro MTT-S
IEEE Slovenia CIS
11TH INTERNATIONAL CONFERENCE ON ELECTRICAL, ELECTRONIC AND COMPUTING ENGINEERING
3-6 June 2024, Niš, Serbia
KuberTENes Birthday Bash Guadalajara - K8sGPT first impressionsVictor Morales
K8sGPT is a tool that analyzes and diagnoses Kubernetes clusters. This presentation was used to share the requirements and dependencies to deploy K8sGPT in a local environment.
Harnessing WebAssembly for Real-time Stateless Streaming PipelinesChristina Lin
Traditionally, dealing with real-time data pipelines has involved significant overhead, even for straightforward tasks like data transformation or masking. However, in this talk, we’ll venture into the dynamic realm of WebAssembly (WASM) and discover how it can revolutionize the creation of stateless streaming pipelines within a Kafka (Redpanda) broker. These pipelines are adept at managing low-latency, high-data-volume scenarios.
Embedded machine learning-based road conditions and driving behavior monitoringIJECEIAES
Car accident rates have increased in recent years, resulting in losses in human lives, properties, and other financial costs. An embedded machine learning-based system is developed to address this critical issue. The system can monitor road conditions, detect driving patterns, and identify aggressive driving behaviors. The system is based on neural networks trained on a comprehensive dataset of driving events, driving styles, and road conditions. The system effectively detects potential risks and helps mitigate the frequency and impact of accidents. The primary goal is to ensure the safety of drivers and vehicles. Collecting data involved gathering information on three key road events: normal street and normal drive, speed bumps, circular yellow speed bumps, and three aggressive driving actions: sudden start, sudden stop, and sudden entry. The gathered data is processed and analyzed using a machine learning system designed for limited power and memory devices. The developed system resulted in 91.9% accuracy, 93.6% precision, and 92% recall. The achieved inference time on an Arduino Nano 33 BLE Sense with a 32-bit CPU running at 64 MHz is 34 ms and requires 2.6 kB peak RAM and 139.9 kB program flash memory, making it suitable for resource-constrained embedded systems.
Understanding Inductive Bias in Machine LearningSUTEJAS
This presentation explores the concept of inductive bias in machine learning. It explains how algorithms come with built-in assumptions and preferences that guide the learning process. You'll learn about the different types of inductive bias and how they can impact the performance and generalizability of machine learning models.
The presentation also covers the positive and negative aspects of inductive bias, along with strategies for mitigating potential drawbacks. We'll explore examples of how bias manifests in algorithms like neural networks and decision trees.
By understanding inductive bias, you can gain valuable insights into how machine learning models work and make informed decisions when building and deploying them.
ACEP Magazine edition 4th launched on 05.06.2024Rahul
This document provides information about the third edition of the magazine "Sthapatya" published by the Association of Civil Engineers (Practicing) Aurangabad. It includes messages from current and past presidents of ACEP, memories and photos from past ACEP events, information on life time achievement awards given by ACEP, and a technical article on concrete maintenance, repairs and strengthening. The document highlights activities of ACEP and provides a technical educational article for members.
Comparative analysis between traditional aquaponics and reconstructed aquapon...bijceesjournal
The aquaponic system of planting is a method that does not require soil usage. It is a method that only needs water, fish, lava rocks (a substitute for soil), and plants. Aquaponic systems are sustainable and environmentally friendly. Its use not only helps to plant in small spaces but also helps reduce artificial chemical use and minimizes excess water use, as aquaponics consumes 90% less water than soil-based gardening. The study applied a descriptive and experimental design to assess and compare conventional and reconstructed aquaponic methods for reproducing tomatoes. The researchers created an observation checklist to determine the significant factors of the study. The study aims to determine the significant difference between traditional aquaponics and reconstructed aquaponics systems propagating tomatoes in terms of height, weight, girth, and number of fruits. The reconstructed aquaponics system’s higher growth yield results in a much more nourished crop than the traditional aquaponics system. It is superior in its number of fruits, height, weight, and girth measurement. Moreover, the reconstructed aquaponics system is proven to eliminate all the hindrances present in the traditional aquaponics system, which are overcrowding of fish, algae growth, pest problems, contaminated water, and dead fish.
TIME DIVISION MULTIPLEXING TECHNIQUE FOR COMMUNICATION SYSTEMHODECEDSIET
Time Division Multiplexing (TDM) is a method of transmitting multiple signals over a single communication channel by dividing the signal into many segments, each having a very short duration of time. These time slots are then allocated to different data streams, allowing multiple signals to share the same transmission medium efficiently. TDM is widely used in telecommunications and data communication systems.
### How TDM Works
1. **Time Slots Allocation**: The core principle of TDM is to assign distinct time slots to each signal. During each time slot, the respective signal is transmitted, and then the process repeats cyclically. For example, if there are four signals to be transmitted, the TDM cycle will divide time into four slots, each assigned to one signal.
2. **Synchronization**: Synchronization is crucial in TDM systems to ensure that the signals are correctly aligned with their respective time slots. Both the transmitter and receiver must be synchronized to avoid any overlap or loss of data. This synchronization is typically maintained by a clock signal that ensures time slots are accurately aligned.
3. **Frame Structure**: TDM data is organized into frames, where each frame consists of a set of time slots. Each frame is repeated at regular intervals, ensuring continuous transmission of data streams. The frame structure helps in managing the data streams and maintaining the synchronization between the transmitter and receiver.
4. **Multiplexer and Demultiplexer**: At the transmitting end, a multiplexer combines multiple input signals into a single composite signal by assigning each signal to a specific time slot. At the receiving end, a demultiplexer separates the composite signal back into individual signals based on their respective time slots.
### Types of TDM
1. **Synchronous TDM**: In synchronous TDM, time slots are pre-assigned to each signal, regardless of whether the signal has data to transmit or not. This can lead to inefficiencies if some time slots remain empty due to the absence of data.
2. **Asynchronous TDM (or Statistical TDM)**: Asynchronous TDM addresses the inefficiencies of synchronous TDM by allocating time slots dynamically based on the presence of data. Time slots are assigned only when there is data to transmit, which optimizes the use of the communication channel.
### Applications of TDM
- **Telecommunications**: TDM is extensively used in telecommunication systems, such as in T1 and E1 lines, where multiple telephone calls are transmitted over a single line by assigning each call to a specific time slot.
- **Digital Audio and Video Broadcasting**: TDM is used in broadcasting systems to transmit multiple audio or video streams over a single channel, ensuring efficient use of bandwidth.
- **Computer Networks**: TDM is used in network protocols and systems to manage the transmission of data from multiple sources over a single network medium.
### Advantages of TDM
- **Efficient Use of Bandwidth**: TDM all
2. Light: bouncing photons
Lights send off photons in all directions
Model these as particles that bounce off objects in the scene
Each photon has a wavelength and energy (color and
intensity)
When photon bounce, some energy is absorbed, some
reflected, some transmitted
If we can model photon bounces we can generate
image
Techniques: follow each photon from the light source
until
All of its energy is absorbed (after too many bounces)
It departs the known universe
It strikes the image and its contribution is added to
appropriate pixel
3. Forward Ray Tracing
Rays are the path of these photons
This method of rendering by following photon path is
called ray tracing
Forward ray tracing follows the photon in direction that
light travels (from the source)
Big problem with this approach:
Only a tiny fraction of rays will reach the image
Extremely slow
Ideal Scenario:
We’d like to magically know which rays will eventually
contribute to the image, and trace only those
Direct: No conversion to surface geometry
4. Backward Ray Tracing
The solution is to start from the image and
trace backwards
Start from the image and follow the ray until the
ray finds or fail to find a light source
5. Backward Ray Tracing
Basic ideas:
Each pixel gets light from just one direction- the line
through the image point and focal point
Any photon contribute to that pixel’s color has to come
from this direction
So head in that direction and find what is sending light
this way
If we hit a light source-we’re done
If we find nothing-we’re done
At the end we’ve done forward ray tracing, but
only for rays that contribute to the image
6. Basic Idea: Ray Casting
Based on the idea of ray tracing •Only consider Primary Ray
•Trace from eat each pixel
as a ray into object space
• Compute color value along
the ray, composite
• Assign the value to the
pixel
7. Data Representation
•3D volume data are represented by a finite number of cross
sectional slices (hence a 3D raster)
•On each volume element (voxel), stores a data value (if it uses
only a single bit, then it is a binary data set. Normally, we see a
gray value of 8 to 16 bits on each voxel.)
N x 2D arraies = 3D array
8. Data Representation (2)
What is a Voxel? – Two definitions
A voxel is a cubic cell, which
has a single value cover
the entire cubic region
A voxel is a data point
at a corner of the cubic cell
The value of a point inside the
cell is determined by interpolation
9. Ray Casting
Stepping through the volume: a ray is cast into the volume, sampling the
volume at certain intervals
The sampling intervals are usually equi-distant, but don’t have to be
At each sampling location, a sample is interpolated / reconstructed from the
grid voxels
popular filters are: nearest neighbor (box), trilinear (tent), Gaussian, cubic
spline
Classification: map from density to color, opacity
Composite colors and opacities along the ray path
20. Classification/Transfer Function
Maps raw voxel value into presentable entities:
color, intensity, opacity, etc.
Raw-data material (R, G, B, , Ka, Kd, Ks, .)
Region of interest: high opacity (more opaque)
no interest: translucent or transparent
Often use look-up tables (LUT) to store the
transfer function
21. Levoy – Gradient/Normals
Central difference
per voxel
2
2
2
1
,
,
1
,
,
,
1
,
,
1
,
,
,
1
,
,
1
k
j
i
k
j
i
z
k
j
i
k
j
i
y
k
j
i
k
j
i
x
v
v
G
v
v
G
v
v
G
X+1
y-1,
Y+1
z-1
22. Levoy - Shading
Phong Shading + Depth Cueing
)
)
(
)
(
(
2
1
n
s
d
p
a
p H
x
N
k
L
x
N
k
x
d
k
k
C
k
C
x
C
Cp = color of parallel light source
ka / kd / ks = ambient / diffuse / specular light coefficient
k1, k2 = fall-off constants
d(x) = distance to picture plane
L = normalized vector to light
H = normalized vector for maximum highlight
N(xi) = surface normal at voxel xi
23. Compositing
Front-to-back
back-to-front
(1 )
(1 )
s s
s s
C C c
(1 )
(1 )
s s
s
C c C
Advantage: early ray termination
Advantage: object approach suitable for hardware implementation
It is the accumulation of colors weighted by opacities
30. VTK Ray Casting Example
The given data represents a mummy
preserved for a long time. So the skin is
dried and not very crisp when compared
to the data set given in Project 3.
The dried skins iso value was found to
be around 70 to 90. The skull iso value
was around 100 to 120. In order to
visualize this data set a opacity transfer
function and a color transfer function are
constructed. The opacity for values
ranging from 0 - 50 is chosen to be 0.0
and 55 - 80 is chosen to be 0.1 (semi
translucent) and finally the bone values
ranging from 90 - 120 is given a complete
opaque value of 1.0. The colors are
chosen in such a way that the skin range
has a light blue and the bone has a
complete white and all other values have
a color value of 0.0.
www.cs.utah.edu/.../sci_vis/prj4/REPO
RT.html
31. VTK Ray Casting Example
create the maximum
intensity projection of the
image. This looks more
like an x-ray of the
mummy. I used the inbuilt
method in VTK called
vtkVolumeRayCastMIPFun
ction . The opacity transfer
function plays a major role
in this technique and the
color transfer function is
used to adjust the contrast
and get good looking
images.
www.cs.utah.edu/.../sci_v
is/prj4/REPORT.html
32. Adaptive Termination
The goal of adaptive termination is to quickly identify the
last sample along a ray that significantly changes the
color of the ray. We define a significant color change as
one in which C_out – C_in > Epsilon for some small
Epsilon > 0. Thus, Once opacity first exceeds 1-Epsilon,
the color will not change significantly. This is the
termination criteria.
Higher values of Epsilon reduce rendering time, while
lower values of Epsilon reduce image artifacts producing
a higher quality image.
33. Four Steps Summary
The volume ray casting algorithm comprises :
Ray casting. For each pixel of the final image, a ray of sight is shot ("cast")
through the volume. At this stage it is useful to consider the volume being
touched and enclosed within a bounding primitive, a simple geometric
object — usually a cuboid — that is used to intersect the ray of sight and the
volume.
Sampling. Along the part of the ray of sight that lies within the volume,
equidistant sampling points or samples are selected. As in general the
volume is not aligned with the ray of sight, sampling points usually will be
located in between voxels. Because of that, it is necessary to trilinearly
interpolate the values of the samples from its surrounding voxels.
Shading. For each sampling point, the gradient is computed. These
represent the orientation of local surfaces within the volume. The samples
are then shaded, i. e. coloured and lighted, according to their surface
orientation and the source of light in the scene.
Compositing. After all sampling points have been shaded, they are
composited along the ray of sight, resulting in the final colour value for the
pixel that is currently being processed. The composition is derived directly
from the rendering equation and is similar to blending acetate sheets on an
overhead projector.
http://en.wikipedia.org/wiki/Volume_ray_casting
35. References
This set of slides references slides used
by Prof. Torsten Moeller (Simon Fraser),
Prof. Han-Wei Shen (Ohio State), Prof.
Jian Huang (UTK).
Prof. Karki at Louisiana State University
Prof. Frank Pfenning at Carnegie Mellon
University