How to apply same 2D logical mask to each 3D layer effctively?
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RGB = imread('onion.png');
mask = RGB(:,:,1)>100;
%%How can I do something like below
RGB(mask,1:3) = 0; % I want to apply same 2D 'mask' for all the 3 layers
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Image Analyst
il 13 Lug 2018
Try this:
% Mask the image using bsxfun() function to multiply the mask by each channel individually.
maskedRgbImage = bsxfun(@times, rgbImage, cast(mask, 'like', rgbImage));
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Image Analyst
il 13 Lug 2018
It might be slightly faster but it's not general. It's depending on there being at least some red in every pixel of Im2 that you want to use as a mask. So it won't work for a general color where the shape in Im2 could be anything but would work in your specific computer graphics case.
Walter Roberson
il 14 Lug 2018
Using the multiply version can be faster sometimes because the multiply version on sufficiently large matrices can be sent to LAPACK for multithreaded execution.
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