How to change pixel values of background to zero

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Kavitha Srinivasan 2013-6-18

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https://ww2.mathworks.cn/matlabcentral/answers/79367-how-to-change-pixel-values-of-background-to-zero

I have an gray image as uint16. the background of the image (air region)has got some pixel values. I want to make them all zero. Any idea how do do it? Your help is much appreciated. Thanks

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Matt J 2013-6-18

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How about

image(image<airthreshold)=0;

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Kavitha Srinivasan 2013-6-18

thanks for your reply. But how to get the airthreshold value?

Matt J 2013-6-18

编辑：Matt J 2013-6-18

That depends on noise and what's going on in the rest of the image. In one of your tags, you seem to say that this is a CT image. In my experience, anything below 500 HU can usually be classified as air, but extreme noise-levels could change that.

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