What is the best edge detector?

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Pamela Paolo 2012-10-18

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Hello What is the difference between sobel, prewitt, canny, laplacien, log...What is the best one used to detect edges? I used sobel and log edge detector but always i had an open edges. There is some solution to close edges? thanks

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Walter Roberson 2012-10-19

If someone asks you what the best vehicle is for bringing home milk, are you going to tell them a particular brand and model and model year of automobile before even asking whether the milk is being transported a block from the corner store, or hundreds of miles up to the International Space Station ?

There is no "best" algorithm to detect edges. There are algorithms that are better in particular circumstances. Better algorithms yet might be invented a week from Sunday, or within a few billion years at latest.

Pamela Paolo 2012-10-19

thanks

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Image Analyst 2012-10-19

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The best edge detector is the one that you are happiest with.

For edge linking or closing gaps in edge outlines, try imclose() or try Peter's site for edge-linking code: http://www.csse.uwa.edu.au/~pk/Research/MatlabFns/#edgelink

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Walter Roberson 2012-10-19

It is part of findendsjunctions.m and is the first routine in that file after findendsjunctions itself.

Image Analyst 2012-10-20

I haven't used that edge linking code. It's Peter's. If you've searched your hard drive for both those m-files, and can't find any of them, and you've searched inside all the m-files and still couldn't find it, then you'll have to contact Peter.

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