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I'm looking for algorithms, papers, or software to enhance faxes, images from cell phone cameras, and other similar source for readability and OCR.
I'm mainly interested in simple enhancements (eg. things you could do using ImageMagick), but I'm also interested in more sophisticated techniques. I'm already talking to vendors, so for this question I'm mostly looking for algorithms or open source software.
To further clarify: I'm not looking for OCR software or algorithms; I'm looking for algorithms to clean up the image so it looks more readable to the human eye, and can possibly be used for OCR.