Unsupervised evaluation of image segmentation
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Good evening, do you can give me a program that the evaluation of unsupervised image segmentation (region)? THANK YOU GREETING
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Quattro
on 17 Aug 2011
Dear Sarah,
Your question is not completely clear to me, but if I guess correctly what you mean I suggest to search in the MATLAB help for Cluster Analysis and to take a look at the 'silhouette plot' function.
Success, Q
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Image Analyst
on 17 Aug 2011
Often this is done by constructing an ROC Curve. ROC means "Receiver Operating Characteristic" http://en.wikipedia.org/wiki/Receiver_operating_characteristic. Basically it's the plot of the true positive rate against the false positive rate. If you have various segmentation algorithms that you want to evaluate, you need to know the "ground truth" - in other words the "right" answer or what a perfect segmentation would give. This could simply be your expert opinion as to what's right. Then you see how many pixels the algorithms got right and how many they got wrong and plot them. This will let you evaluate/compare the different algorithms you used to do your segmentation. Do some internet research for more info on ROC curves. There are ROC files in the File Exchange http://www.mathworks.com/matlabcentral/fileexchange/?term=ROC
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Walter Roberson
on 8 Sep 2011
In general terms, the program you gave the code for reads in two images and displays them on the screen, and then stops.
I not understand the Levine and Nazif reference. Are you now asking that someone give you an overview of how a different program works? If so then you would need to post the code or a link to it.
If you are hoping for an explanation of the theory behind a published paper, then that is something you should probably talk about with a professor, or at least raise the matter in a forum dedicated to image processing theory. This forum is dedicated to answering questions about MATLAB.
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