image processing - Extract numbers from poker cards -

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i want develop application that, given image of several poker cards, able tell numbers on cards. have never done image-processing before, wonder how should started. thoughts appreciated!

a lot depends on how images like. example if images taken mobile cam , have pre-processed before can ocr.

i've used tesseract ( https://code.google.com/p/tesseract-ocr/) before ocr , works ok printed text. poorly without training on images mobile phone. can 3rd party paid api if dont want go through work yourself.

also valuable advice got

  1. keep text part in image. (eliminate unnecessary lines/ noise).
  2. if text vertical or oriented @ angle, align text region in horizontal direction.

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