How to change pixel values of background to zero

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Kavitha Srinivasan
Kavitha Srinivasan 2013-6-18
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
Matt J 2013-6-18
How about
image(image<airthreshold)=0;
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Kavitha Srinivasan
Kavitha Srinivasan 2013-6-18
thanks for your reply. But how to get the airthreshold value?
Matt J
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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