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You should not use a cascade for such a simple thing I would say? I mean, a logo is always static and the only different thing is the color, right? If that's the case, go for template matching! Feed that Adidas logo as your template into your scenes and you will detect it right away. It will even perform better than your cascade, that you can bet.

Take a look into the link I gave, go down further in bottom and you will see an example where someone tries to detect a coin (consider it your logo, since it also has a fixed shape and it does not change) in frame.

You should do not need to use a cascade for such a simple thing I would say? I mean, a logo is always static and the only different thing is the color, right? If that's the case, go for template matching! Feed that Adidas logo as your template into your scenes and you will detect it right away. It will even perform better than your cascade, that you can bet.

Take a look into the link I gave, go down further in bottom and you will see an example where someone tries to detect a coin (consider it your logo, since it also has a fixed shape and it does not change) in frame.