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Dewarp images taken using digital camera

I want to dewarp slightly cylindrical documents photographed with digital camera (like as in android devices). Is there any opencv algorithm to do the job. I have gone through some research papers regarding this topic but unfortunately they all involve analysis which is quite out of my knowledge. Below is an example of how the actual and processed image should look like. Figure 1 shows actual image and Figure 8 shows processed image.image description image description