Omitting negative pixels in the image representation

2014 2 16
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更新时间：2014 2 18
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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

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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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med-sweng
med-sweng 2014-2-16
@Wayne. Thanks for your reply. So, does giving pixels the value `0` means we are omitting them? And, does that also have the same meaning as `removing` them?
Wayne King
Wayne King 2014-2-16
not sure how you want to remove them, removing them from what? analysis, display?
med-sweng
med-sweng 2014-2-18
Removing them from the display
Image Analyst
Image Analyst 2014-2-18
Wayne already gave you code for that. Look above.

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