How to get edge coordinates of a image? [closed]

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i posted a question regarding croping an image present in a parent image. How can i crop image using C# I've detected the Image edge using one of the online algorithms, now i need to get the coordinates of the corners. How can i get the 开发者_JAVA百科corner coordinates so i can fetch the image from its parent?

The Image is taken with a camera, and has contains a picture of a document. I need to find that document and crop it out of the parent image.

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In the other post you linked, a number of corner detection algorithms were included. I've been experimenting with the AForge filters for corner detection, or the Hough line transform combined with a canny edge detector to pick out the image edges.