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What is the best approach to detect a form on a page and crop it ?

I have a paper form that users fill and sign and upload to us. I need to detect the form in the pic and crop it. I tried putting finder pattern of QR code at the corners and modify the QR detection algorithm in order to find the form. This approach works for about 50% of the case. Is there a better approach to solve this problem ? The image is shown below after applying adaptive threshold to it.

image description

What is the best approach to detect a form on a page and crop it ?

I have a paper form that users fill and sign and upload to us. I need to detect the form in the pic and crop it. I tried putting finder pattern of QR code at the corners and modify the QR detection algorithm in order to find the form. This approach works for about 50% of the case. Is there a better approach to solve this problem ? The image is shown below after applying adaptive threshold to it.

image description