Edge following method to find contour point in each bloks of quadtree decomposition

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Hi all,
I need some reference of edge following method to find contour point in each bloks of quadtree decomposition.
I already make a coding program that will take intensity value of image in each block of quadtree decomposition.
And the next step is i have to search intensity value which will be contour point in each block using edge following method.
is there anyone knows about edge following method?? please help me ^_^a
Regards,

采纳的回答

Image Analyst
Image Analyst 2012-1-15
I'm not sure that makes sense. Each block is "uniform" according to the criteria, so there would be no contours within a block.

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