What pre-processing has Tesseract already included?

[smwikipedia smwikipedia]

I am trying to add some pre-processing & post-processing for my scenario. I read some papers and it seems the steps could be:

• noise attenuation
• orientation correction
• binarization
• segmentation
• spell check
  

I am wondering whether tesseract already contains some?

[Tom Morris]

This wiki page describes what Tesseract does (and has suggestions for others like deskew):

https://code.google.com/p/tesseract-ocr/wiki/ImproveQuality

The wiki actually has a ton of very useful information.  If you haven't reviewed it carefully already, you should go and do it now.

Tom