How can I count pixel of particular color in image?

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GeonWoo Jeon
GeonWoo Jeon 2017-10-31
评论： Image Analyst 2021-6-10
I want to count the number of pixels with particular color in the image below. What function can I use to count pixels?
The size of this image is 672*708*3.

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Image Analyst
Image Analyst 2017-10-31
For example, to get the number of yellow pixels:
yellowPixels = rgbImage(:,:,1) == 255 & rgbImage(:,:,2) == 255 & rgbImage(:,:,3) == 0;
numYellowPixels = sum(yellowPixels(:));
To get the number of blue pixels:
bluePixels = rgbImage(:,:,1) == 0 & rgbImage(:,:,2) == 0 & rgbImage(:,:,3) == 255;
numBluePixels = sum(bluePixels(:));
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Iszuzuldin amirull bin mohd janudin
Iszuzuldin amirull bin mohd janudin 2021-6-9
mask= g_channel > 100, b_channel > 800, r_channel < 800, b_channel < 0, r_channel < 0;
numBlackPixels = sum(~mask(:))
how can i change to yellow mask ?
Image Analyst
Image Analyst 2021-6-10
@Iszuzuldin amirull bin mohd janudin, try using the Color Thresholder app on the Apps tab of the tool ribbon. Segment your image, probably using the HSV color space would be good. then tell it to export the code as a function that you can then call from your program.

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