about the color of pixel
显示 更早的评论
hi can any one tell me how can i count total no of yellow pixel in an image ? i want to find red ,yellow and black pixels value to find the accuracy of wound tissue.So pls help me in this
回答（1 个）
Ayush
2024-10-23
Hi,
To count the number of yellow, red, and black pixels in an image using MATLAB, you can convert the image to the HSV colour space for better colour discrimination, and then define thresholds to identify each colour. To convert the image to HSV color space you can use the “rgb2hsv” function. Refer to an example code below for a better understanding:
% Convert the image to HSV color space
hsvImg = rgb2hsv(img);
% Define thresholds for yellow color in HSV space
yellowMin = [0.10, 0.4, 0.4]; % Adjust these values as needed
yellowMax = [0.20, 1.0, 1.0]; % Adjust these values as needed
% Create a binary mask for yellow pixels
yellowMask = (hsvImg(:,:,1) >= yellowMin(1) & hsvImg(:,:,1) <= yellowMax(1)) & ...
(hsvImg(:,:,2) >= yellowMin(2) & hsvImg(:,:,2) <= yellowMax(2)) & ...
(hsvImg(:,:,3) >= yellowMin(3) & hsvImg(:,:,3) <= yellowMax(3));
% Count the number of yellow pixels
numYellowPixels = sum(yellowMask(:));
In the above example, I have provided a mask for yellow colour, in a similar way you can get a mask for red and black colour. For more information on the “rgb2hsv" function refer to the below documentation:
类别
在 帮助中心 和 File Exchange 中查找有关 Convert Image Type 的更多信息
2016-2-2
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
