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I think a better way to find page corners is it apply a Hough Line Transform, look for lines of significant length and compute intersections between each pair of them.

http://docs.opencv.org/doc/tutorials/imgproc/imgtrans/hough_lines/hough_lines.html

I think a better and more robust way to find page corners is it apply applying a Hough Line Transform, look for lines of significant sufficient length and compute intersections between each pair of them.

http://docs.opencv.org/doc/tutorials/imgproc/imgtrans/hough_lines/hough_lines.html