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Hi,
You can try to train Haar classifiers to recognize the suit for cards, here is article with detailed explanations how this can be done: http://coding-robin.de/2013/07/22/train-your-own-opencv-haar-classifier.html
However this is not simple task as you will require a lot of positive/negative samples for this.
To recognize the numbers - I think there should be existing solutions, here is good source on OCR: http://blog.damiles.com/2008/11/basic-ocr-in-opencv/
Also you can use findContours to separate cards from each other.
This is not a simple task, if you are really interested - post here your findings and code and I can help to get you tight direction.
