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Omitting negative pixels in the image representation

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med-sweng
med-sweng 2014-2-16
评论： Image Analyst 2014-2-18
Say that I have an image where there are some pixels which values are negative. How can I omit those from the image representation in `MATLAB`?
Thanks.
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Image Analyst
Image Analyst 2014-2-16
What's going on? You already had a discussion on this going in http://www.mathworks.com/matlabcentral/answers/116236#comment_196593 and then you posted the same thing twice more. I deleted the version that no one has answered yet. Why would you want to look for answers in three separate threads?????

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回答（1 个）

Wayne King
Wayne King 2014-2-16
Depending on your data and application, you can just take the absolute value. If that doesn't work you can set all the negative values to zero using logical indexing
X = randn(256);
X(X<0) = 0;
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