This document discusses various image processing techniques in MATLAB, including:
1. Using imfinfo() to get metadata about an image, impixelinfo to query pixel values, and rgb2ind() to convert images to indexed color for reduced file size.
2. How colormaps like jet and spring can be applied to images.
3. Techniques for creating grayscale images, dealing with data type issues when displaying images, and extracting individual bit-planes from an image.
Juggle: Hybrid Large-Scale Music RecommendationJosé Devezas
Presentation of the Juggle system for the SAPO technical team in Lisbon. Juggle is a large-scale graph-based music recommender system that integrates user profiles, audio features and contextual information.
Visualising is essential for data science process because it allows as to look at the portrait of our data and develop new hypotheses about our problem. However, visualisation does not scale very well as we are limited by the number of pixels in the our screen (at least for static graphics). This deck talks about the approach - Bin - Summarize - Smooth approach to visualise big data which has been developed by Hadley Wickham and then implemented in an R package in Bigvis.
Juggle: Hybrid Large-Scale Music RecommendationJosé Devezas
Presentation of the Juggle system for the SAPO technical team in Lisbon. Juggle is a large-scale graph-based music recommender system that integrates user profiles, audio features and contextual information.
Visualising is essential for data science process because it allows as to look at the portrait of our data and develop new hypotheses about our problem. However, visualisation does not scale very well as we are limited by the number of pixels in the our screen (at least for static graphics). This deck talks about the approach - Bin - Summarize - Smooth approach to visualise big data which has been developed by Hadley Wickham and then implemented in an R package in Bigvis.
We are restricted from importing cv2 numpy stats and other.pdfDARSHANACHARYA13
We are restricted from importing cv2, numpy, stats and other third party libraries, with the
only exception of math, importing math library is allowed (import math).
the input image contains objects of four geometric shapes: circle, square, rectangle, and ellipse.
The shapes have a brighter intensity compared to the background. The objective of the
assignment is to count the total number of each geometric shape in the image by performing
binary image processing. The overall steps are
Copmute the histogram
Compute optimal threshold
Create binary image
Perform blob-coloring
For each region, compute area, centroid, and shape (circle, square, rectangle, or ellipse)
Count the number of circles, number of squares, number of rectangles, and number of ellipses.
Mark the center of each region with a label (c for circle, r for rectangle, s for square, and e for
ellipse)
Objective 2: Perform compression using run-length encoding and decoding of a binary image.
Shape Counting:
a. Write a program to binarize a gray-level image based on the assumption that the image has a
bimodal histogram. Determine the optimal threshold required to binarize the image. Your code
should report both the binarized image and the optimal threshold value. Also assume that
background is darker than foreground objects in the input gray-level image.
Starter code available in directory region_analysis/
region_analysis/binary_image.py:
compute_histogram: write your code to compute the histogram in this function, If you return a list it
will automatically save the graph in output folder
find_threshold: Write your code to compute the optimal threshold. This should be implemented
using the iterative algorithm discussed in class (See Week 4, Lecture 7, slide 42 on teams). Do not
implment the Otsu's thresholding method. No points are awarded for Otsu's method.
binarize: write your code to threshold the input image to create a binary image here. This function
should return a binary image which will automatically be saved in output folder. For visualization
one can use intensity value of 255 instead of 1 in the binary image. That way the objects appear
white over black background
Any output images or files will be saved to "output" folder
b. Write a program to perform blob-coloring. The input to your code should be a binary image (0's,
and 255's) and the output should be a list of objects or regions in the image.
region_analysis/shape_counting.py:
blob_coloring: write your code for blob coloring here, takes as input a binary image and returns a
list/dictionary of objects or regions.
Any output images will be saved to "output" folder
c. Ignore shapes smaller than 10 pixels in area generate a report of the remaining regions (region
Number, Centroid, Area, and Shape).
region_analysis/shape_counting.py:identify_shapes: write your code for computing the statistics of
each object/region, i.e area and location (centroid) here, and the shape (c for circle, s for square, r
for rectancle, and e for .
How represent the digital image in Matlab
https://www.youtube.com/watch?v=-6U8le3HQlI
https://www.slideshare.net/mustafa_92/working-with-images-inmatlabgraphics-251331243
https://github.com/Mustafa-nafaa/Multimedia-TechnologyLab/tree/main/Week2:Image%20Representation
What Is Image Data?
Data Types in MATLAB
Supported Image Formats
Read image from graphics file
Information about graphics file
Write image to graphics file
Convert RGB image or colormap to grayscale
Image Histogram in MATLAB
Resize image in MATLAB
Image representation, sampling and quantization
Sampling image in MATLAB
quantization image in MATLAB
imread() – reading an image with different postfixes
imresize() – resizing an image to any given size
figure – opening a new graphical window
subplot(#of row, # of col, location) – showing different plots/images in one graphical window
imshow() – displaying an image
Imquantize- (A,levels) quantizes image
What is sampling?
What is spatial resolution?
What is quantization?
What is grey-level resolution
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
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Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
4. Querying a pixel info
● Because the image itself is an array, we can check the values it is storing.
For example, if we want to know the values of the pixel at (350, 250):For example, if we want to know the values of the pixel at (350, 250):
● >> img(350,250,:)
● ans(:,:,1) = 157
● ans(:,:,2) = 70
● ans(:,:,3) = 0
5. rgb2ind()
● "Indexed color saves a lot of memory, storage space, and transmission
time: using truecolor, each pixel needs 24 bits, or 3 bytes. A typicaltime: using truecolor, each pixel needs 24 bits, or 3 bytes. A typical
640x480 VGA resolution truecolor uncompressed image needs 640x480x3
= 921,600 bytes (900 KiB). Limiting the image colors to 256, every pixel
needs only 8 bits, or 1 byte each, so the example image now needs only
640x480x1 = 307,200 bytes (300 KiB), plus 256x3 = 768 additional bytes to
store the palette map in itself (assuming RGB), approx. one third of the
original size."
11. Creating grayscale image: We're going to create two
grayscale images of size 320×240,320×240,one with pixels
all black and the other one all white:
h = 240;
w = 320;
white = uint8(255*ones(h,w));
black = uint8(zeros(h,w));
figure;figure;
subplot(121);
imshow(white);
subplot(122);
imshow(black);
12. Class - Data Type: There are one thing to keep in mind when we process
images: data type. Is my image in uint8or double? One of the most frequent
issues caused by the data type is imshow(). We converted the image to double
to do something with the image, and now we want to draw it
● img = imread('cameraman.tif');
● img_d = double(img);● img_d = double(img);
● % ... played with the image, now we want to display it
● imshow(img_d);
Result is white image rather than original image
The imshow() has two function overloading. It takes image with type uint8 as it ranges
between [0, 255], and takes image with type double as it ranges between [0, 1]. So, in our
case, every pixel with over 1 is considered saturated, and that's why we got white cameraman.
14. Extracting bit-plane from Grayscale image With mod() operation, we can extract a bit-
plane image. The mod(img,2) gives us either 0 or 1
img = imread('cameraman.tif');
img = double(img);
bp0 = mod(img,2);
imshow(bp0);
title('bit-plane 0');
bit-plane 0 bit-plane 1
title('bit-plane 0');