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I am looking for an open source program to recognise known features, letters, numbers and symbols, displayed on my screen on a 2D plane.

There may be some occlusion or particle effects over the images.

In this particular case I am trying to detect features from Hearthstone (an online card game).

The best answer will answer the question for a general case matching the features I am trying to identify as I want to develop with this and use it for other similar games.

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On Linux/Mac, I use Sikuli. It automates anything you see on the screen. It uses image recognition to identify and control GUI components. It is useful when there is no easy access to a GUI's internal or source code.

http://www.sikuli.org/

Sikuli is a JAVA app and cross-platform (Win, Mac, Linux).

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