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How to check the color variation in the ROI of an image

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hamed abdulaziz
hamed abdulaziz 2014-2-15
回答： Image Analyst 2014-2-15
Hi All,
I have many coloured images,please could anyone tell me how to check the color variation in the ROI (segmented image) of an image?
thanks in advance

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Image Analyst
Image Analyst 2014-2-15
One reasonable way would be to calculate the mean color of the image. Then calculate the delta E (color difference) from every pixel to that mean color. Then histogram the delta E image. See http://www.mathworks.com/matlabcentral/fileexchange/31118-color-segmentation-by-delta-e-color-difference
Or you might want to calculate the Color Frequency Image

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