Automatic correction of the scanned image to achieve

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You can try imagemagick. It provides a correction function. Parameters recommended 40%

> convert infile.tif -deskew 40% outfile.tif
works fine, especially the handling vertical ancient outperformed other software.

There is also ScanKromsator, Scantailor two all-scan image processing software.

There is recogniform imageprocessor, full-featured, the effect is obvious, but can not find crack version, a trial version will add two diagonal black lines on the output picture. And no programming is very difficult to control it based on complex processing script.

There are some online personal written deskew small programs, such as http://galfar.vevb.net/wp/tag/deskew/ good times and bad quality correction.