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color distribution in L*a*b*

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ZHI QU
ZHI QU 2018-11-14
评论： Juan Villacrés 2019-4-4
I got the histogram of a* channel of a pic. I wanna know the region distribution. For example, which are the regions with a*<0 and where are a*>0. Is there anyway to do this?

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回答（1 个）

madhan ravi
madhan ravi 2018-11-14
a(a<0)
a(a>0)
  2 个评论
ZHI QU
ZHI QU 2018-11-14
Thx Madhan. I should be more clear, I want to segment the pic according to the a* value.
Juan Villacrés
Juan Villacrés 2019-4-4
If you want to segment the image:
% Define the mask according the "a" channel
mask = Ioriginal(:,:,2)<0; % a value
% Multiply the image with the mask in the three channels
Inew = Ioriginal.*repmat(mask,[1,1,3]);

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