Manual thresholding cropping [image processing]

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Esther
Esther 2012-11-8
Hi. May i know if manual thresholding allows autocropping? where i set T a value, bw = im2bw(J,T);
because usually auto thresholding was done with autocropping. but i was told me to set a value for my image instead of using graythresh.

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Image Analyst
Image Analyst 2012-11-8
Cropping and thresholding are two totally separate and independent operations. One operation does not need, depend on, allow, or enable the other operation at all. I would not say that autothresholding is usually done with autocropping - not in general, though it may be in some specific situation you maybe referring to, like your co-worker's program. You can use graythresh() if you want to determine a threshold value, though in my experience it seldom selects the best threshold. It seems to work best for high contrast situations where foreground and background are well separated in the histogram (i.e., they have vastly different intensities).
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Esther
Esther 2012-11-8
编辑：Esther 2012-11-8
i didn't use imcrop(). but i use method by getting the outmost object border coordinates to crop it out.
Image Analyst
Image Analyst 2012-11-8
You mean like
submatrix = fullMatrix(row1:row2, col1:col2);
? What about this threw an exception?

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