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Logo detection techniques

asked 2013-12-22 06:01:23 -0500

Davidbo gravatar image

updated 2017-01-19 04:01:49 -0500

I'm working now on a project where we need to detect and recognize different logos in video files. Adidas logo were chosen to be my laboratory rat. I trained a cascade and it gave good results. But only for black logo, so i trained another cascade for same shape but the color of the logo was white now, and it also gave good results. Now what do i do with all those colored logos ? I tried contour based algorithms cause they color indifferent, but they did not give good results, especially for logos like Adidas where there several parts : image description and i should combine all parts together somehow. My question is how can i make all bright logos to became white, and dark logos to become black, which manipulations can cause such effect, and if it is possible would cascades still work on such images ? Or there might be some combination of algorithms (cascade + contour) , or there some other approach exists that fits my problem ? Thanks in advance.

Performance not so important.

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answered 2017-07-26 04:37:43 -0500

Raki gravatar image

updated 2017-07-26 05:20:28 -0500

You 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.

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... but template matching isn't rotation/scale invariant and works bad in case of partial occurrences

pklab gravatar imagepklab ( 2017-07-26 05:54:54 -0500 )edit
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Actually, it can be scale invariant. And the OP did not mention any other complication but just color, so..

Raki gravatar imageRaki ( 2017-07-26 05:58:00 -0500 )edit
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Asked: 2013-12-22 06:01:23 -0500

Seen: 730 times

Last updated: Jul 26 '17