how to know if the image is homogeneous

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bay rem
bay rem 2016-2-4
编辑： Image Analyst 2016-2-4
i have a set of images and i'd like to extract from them the homogeneous images, like this following one (what i mean of homogeneity means have same degree of color):

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Image Analyst
Image Analyst 2016-2-4
编辑：Image Analyst 2016-2-4
Extract the separate color channels:
% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);
greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);
then call unique() and if the length is 1, it's homogenous in that color channel
if length(unique(redChannel)) == 1
% Only one color so it's homogenous
end
Or you could check the variance
if var(redChannel(:)) == 0
Or you could call std() or imhist(). There are a multitude of ways.

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