edge following method code

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Elsya Nurul Aini
Elsya Nurul Aini 2012-2-12
编辑： A Jenkins 2013-10-9
Dear all,,
is there any reference code about edge following in matlab??
thanks before ^_^a
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Image Analyst
Image Analyst 2012-2-12
Graph/network edges, or image edges? Where have you looked so far?

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Image Analyst
Image Analyst 2012-2-12
Why do you want to "follow" them? Why not first detect them? Then, once you have the edges, which will have various "strengths" of course, what do you want to accomplish? If you really want to follow them you can use bwboundaries but I doubt you want to do that.
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Image Analyst
Image Analyst 2012-2-12
I'm having trouble with step 3. There will be no different content. That's how quadtree decomposition works. It keeps dividing up the image into homogenous blocks until no block had any contours or different gray levels in it. Of course you specify what "different" means. But let's say that you kept going until no block had a gray level spread more than, say, 5 gray levels. So, by definition the block is uniform to within 5 gray levels and there will be no edge or contours within a block.
Elsya Nurul Aini
Elsya Nurul Aini 2012-2-13
sorry I'm late to answer.
thank you for explaining this.
I understand more about it now.
does this mean that in the quadtree block, there is no image in it that have a variation of image content?
so, how do I get to take a graylevel value in each block?
whether there are other functions that can be used to divide the image into some blocks besides quadtrees function??

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