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Thanks! I'll definitely have a look at Haar cascades. How efficient do you think it will be compared to simple image subtraction? I expect it to be slower. However, if it's 5 times slower but replaces 10 image checks for the same effectiveness, then it would definitely be worth it.
– mpenkov
Commented Jan 2, 2012 at 5:03
You'll have to generate cascades, which is a pretty time-consuming process(but also stupidly parallelizeable). It also requires a bunch of input data( I would use the numbers in every font you have on a desktop).
– rsaxvc
Commented Jan 2, 2012 at 5:17
Slower than subtraction, but you can search an image for all instances of a certain cascade at once.
– rsaxvc
Commented Jan 2, 2012 at 5:19

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