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I am trying to recognize the numbers on the 7-segment LCD display(like the digital watch), and first of all I want to 'draw' a bounding box to focus on the LCD screen to get rid of most of the background noise, but I am still not sure which method is suitable for this task. Can anyone help me?

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What platform are you working on? –  Jacob Oct 13 '10 at 18:35
Are you processing a photo of the LCD? Video? Is the LCD moving in the video frame, or is it always in the same place? –  Seth Oct 13 '10 at 18:36
I am working on a app for iPhone, so it is mac based and using objective-c. –  Viper Oct 13 '10 at 18:39
It is pictures I take from iPhone camera, so the LCD will not always the same one or in the same place of the same background, I know it is difficult to recognize every LCD, but what I want is most of them or some typical ones. –  Viper Oct 13 '10 at 18:42

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I won't tell you the exact answer but as far as I can tell you should take a look at the OpenCV library. The keyword you're looking for in the first place is: Region Of Interest (ROI), ie. the bounding box.

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