MATLAB: Separating particular pixels based on RGB value

classifyingfilteringimageimage processingImage Processing Toolboxpixelsrgb

I want to separate a group of pixels in an image which have RGB greater than [120 115 118 ] . How can I do it? The pixels having RGB values above the mentioned ones must appear in black color.How to do it? Thanks in advance.

Best Answer

locations = YourImage(:,:,1) > 120 & YourImage(:,:,2) > 115 & YourImage(:,:,3) > 118;
YourImage(repmat(locations,1,1,3)) = 0;

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MATLAB: How to get a count of all the pixels having a certain RGB value in an image

sum(sum(YourImage(:,:,1) == 0 & YourImage(:,:,2) == 255 & YourImage(:,:,3) == 0))

MATLAB: Assign black pixels to binary image

If "mask" is your binary image, and you want the white parts to be black (and the original pixels in the black areas of your binary image left unaltered) in your original grayscale or rgb image , called "yourImage", do this:

% Mask the image using bsxfun() function to multiply the mask by each channel individually.
maskedImage = bsxfun(@times, yourImage, cast(~mask, 'like', yourImage));

Best Answer

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MATLAB: How to get a count of all the pixels having a certain RGB value in an image

MATLAB: Assign black pixels to binary image

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