Is there is any difference between otsu & graythresh??

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Mariam Sheha
Mariam Sheha 2013-6-5
i am trying to make image segmentation using otsu's method but i am confused about the difference between using that function (IDX = otsu()) or using graythresh(I) ,Regarding that the first function didn't work and always that error appears (??? Undefined function or method 'otsu' for input arguments of type'double'.)...

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Image Analyst
Image Analyst 2013-6-8
You may find Otsu doesn't work well. It seems to work best for high contrast images with well separated bimodal histograms. If you have a skewed unimodal histogram, it often doesn't pick what you'd pick if you did it manually (with my thresholding app: http://www.mathworks.com/matlabcentral/fileexchange/29372-thresholding-an-image). Personally I like the triangle method better - it seems to work with more images that are continuous gray scale.

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Sean de Wolski
Sean de Wolski 2013-6-5
graythresh is MATLAB's Image Processing Toolbox's implementation of the Otsu algorithm.
doc graythresh
Explains this in the references.
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Mariam Sheha
Mariam Sheha 2013-6-7
Thank you for answering my question, but did you know if their is anther matlab equation named by "_otsu_" where i found matlab code using it but it dosn't work properly....
please if you have any further information about that issue report me...
Thanks A lot :)

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Mariam Sheha
Mariam Sheha 2013-6-11
Thanks A lot, your answer is helpful...

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