I need to get programmatically polygon points coordinates from image.

Here is an example: http://imgur.com/gbs96tt


  1. Take image with transparent background and some colored polygon on it
  2. Run this library on image.
  3. Get polygon points coordinates in pixels.

I don't know anything about software available for this purpose.


Maybe it will be useful for someone - there is no native realization of this, written on php.

But there is very useful program - potrace - which can be lauched from shell_exec.

It helped me with my problems.

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