Segmenting an image according a threshold
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Say that I have a grayscale image, which values range from `[0,255]`. Say that I want the pixels which values are larger than or equal to `66` for instance to be `white`, and the rest pixels to be `black`. How can I do that in `MATLAB`?
Thanks.
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Answers (2)
Image Analyst
on 30 Oct 2013
Edited: Image Analyst
on 30 Oct 2013
The easiest way by far, is to simply threshold:
binaryImage = grayImage >= 66;
Ashish's method doesn't create black pixels, and Kevin's is inefficient. My fast and efficient method will create a binary image which is used in virtually all processing afterwards, such as labeling, morphology, regionprops, hole filling, etc.
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Kevin Claytor
on 30 Oct 2013
thresh = 66;
I(I < thresh) = 0;
I(I > thresh) = 255;
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Ashish Uthama
on 30 Oct 2013
Edited: Ashish Uthama
on 31 Oct 2013
[Edit, I meant to correct Kevin's code, pointing out the need for >=]
I(I >= thresh) = 255;
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