Sounds like good stuff is happening. I'm swamped closing out my last semester of school, so I won't be able to contribute for a bit.
Just wanted to point out two bits of code from my work that may be the most useful:
1) overcropping is already implemented - check the trimNoise function. Big help for scanned PDFS (such as Google Books).
2) proper centering of images. Related code is found in trimNoise as well as the main processing function.
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