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Detecting Page Corners

I would like to detect the corners of the "rectangle" within the below images as marked by the "arrows". Any suggestions on how to approach this or what to use would be appreciated.

I am new to OpenCV and are trying some of the examples using canny edge detection and hough lines, but are a bit at a loss.

image description image description

Detecting Page Corners

I would like to detect the corners of the "rectangle" within the below images as marked by the "arrows". Any suggestions on how to approach this or what to use would be appreciated.

I am new to OpenCV and are trying some of the examples using canny edge detection and hough lines, but are a bit at a loss.

What I am trying to achieve is to extract the scanned pages from the images, and as such need to determine the rectangle of each page.

image description image description

The below is the 2 original images from which the images outlines was derived.

image description image description