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Need help in understanding freeman chain coding

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Hello,I have read about freeman coding which connects pixels in 8 neighbourhood area.
Now I am currently using the subpixel edge detection to detect edges,but the edge points are in extremelyrandom order.
So as per the discussion I had with the author of the subpixel code(code is listed below),he has recommended that I use freeman chain coding to link those points
Now f,the two existing implementations of freeman on matlab are incorrect and end up failing on my images.
So I would appreciate it if someone could either point out why the method is failing on my cases or if there are any articles/tutorials that can help me understand this.
Images that I use
freeman chain code on matlab
Subpixel accuracy edge detection

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