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How to remove shadow from scanned documents using OpenCV?

I'd like to remove shadow before image binarization using OpenCV. I've tried Otsu Method and adaptive thresholding, however for images where there are large regions of shadow, these two methods will not give good results.

Any better solutions? Thanks in advance.

image description image description image description

How to remove shadow from scanned documents using OpenCV?

I'd like to remove shadow before image binarization using OpenCV. I've tried Otsu Method and adaptive thresholding, however for images where there are large regions of shadow, these two methods will not give good results.

Any better solutions? Thanks in advance.

image description image description image description