Automatic image Enhancement - Scanned Document
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Dropbox have make a blog post about there automatic enhancement method for scanned document image - Fast Document Rectification and Enhancement
I followed the post and they mention a formula to make the enhancement:
J(x,y) = gain(x,y)*I(x,y) + offset(x,y)
where J is the output image and I is the Input image, the problem is i don't understand how they calculate gain and offset for each pixel
Here is a simple input and output image that can illustrate the result: Input image:
Output image :
Thank you for your reply
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