speedup for-loops by bsxfun?

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BY H
BY H 2021-8-10
评论： Stephen23 2021-8-11
Is any solution to speedup my following code?
Supposed I have an RGB image, for each pixel, I want to find the closest color in given palette (k colors) for quantization.
PALETTE = [c1R, c1G, c1B; ....; ckR, ckG, ckB];
for i = 1:size(img,1)
for j = 1:size(img,2)
% find the closest color from PALETTE
end
end

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回答（1 个）

Walter Roberson
Walter Roberson 2021-8-11
rgb2ind() does that, at least for some definition of "closest". You need to be specific about how you want to compute "closest" when it comes to colour.
If the task is to quantize the colors, then
Q = reshape(PALETTE(rgb2ind(YourImage, PALETTE),:),size(YourImage));

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