problem regarding edge detection

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matlab_image
matlab_image 2012-8-15
I am applying edge detection methods like Sobel, prewitt,robert etc. Can anybody please tell me how can I find probability of detection & Probability of False alarm with different values of SNR, after applying these edge detection methods... Thanks in advance..

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回答（1 个）

Image Analyst
Image Analyst 2012-8-15
Call bwlabel to label the images. Then use something like ginput to ask your user which edges are genuine and which are false. Then just take the ratio of the number of false blobs divided by the total number of blobs.
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Image Analyst
Image Analyst 2012-8-20
1) If you don't know if an edge is a true edge or a false edge then I can't help you. Perhaps you can just make up random numbers in that case. I mean, if you don't know what's true and false then who would?
2) numberOfClicks = length(x); where x is returned from ginput().
3) Call the Mathworks and tell them that you can't use their web site because of some kind of a login problem.
matlab_image
matlab_image 2012-8-22
Thanks for answering..... I know which are false edges and which are true.. but I have doubts about PD and PFA..... So I will try to clear these while reading some tutorials........ Thanks again....

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