Segmenting an image according a threshold

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med-sweng
med-sweng 2013-10-30
编辑： Ashish Uthama 2013-10-31
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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回答（2 个）

Image Analyst
Image Analyst 2013-10-30
编辑：Image Analyst 2013-10-30
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.
Kevin Claytor
Kevin Claytor 2013-10-30
thresh = 66;
I(I < thresh) = 0;
I(I > thresh) = 255;
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Ashish Uthama
Ashish Uthama 2013-10-30
编辑：Ashish Uthama 2013-10-31
[Edit, I meant to correct Kevin's code, pointing out the need for >=]
I(I >= thresh) = 255;

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