MATLAB: Problem in ycbcr color space

color spaceimage processingImage Processing Toolboxycbcr

I am facing some problems in using the ycbcr color space. For a certain purpose this model is the most suitable. But conversion from RGB to ycbcr yields me some negatives values too… Please help. Why does this happen? Are there any ways to solve this?

Best Answer

My speculation would be that you started with a uint8() image, used double() on that, and asked to use rgb2ycbcr() on the result. That could result in negative values, as the datatype of what you ask to convert (uint8 or double) determines which range of values are expected (0 to 255, or 0.0 to 1.0).

Always remember: the result of applying double() to a uint8 image is not an image! If you want your image represented in double precision then use im2double() not just double()

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MATLAB: Detect Colors in a white image

in a unsigned 8bit integer image (uint8) (just example)

 I = your_image
assert(isa(I,'uint8'),'For this example I is expected to be uint8');
if(any(I(:)~=255))
   fprintf('There are non white areas');
else
   fprintf('All white!');
end

MATLAB: Convert RGB to YCbCr

Does the information in the Help help you:

YCBCR = rgb2ycbcr(RGB) converts the truecolor image RGB to the equivalent image in the YCbCr color space. RGB must be a M-by-N-by-3 array.
If the input is uint8, YCBCR is uint8, where Y is in the range [16 235], and Cb and Cr are in the range [16 240]. If the input is a double, Y is in the range [16/255 235/255] and Cb and Cr are in the range [16/255 240/255]. If the input is uint16, Y is in the range [4112 60395] and Cb and Cr are in the range [4112 61680].

Best Answer

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MATLAB: Detect Colors in a white image

MATLAB: Convert RGB to YCbCr

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