Joint histogram

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Well,I'm a newbie to computer vision. What are 'concateneated' histograms? I found the term in the paper above (follow the link)

Actually 2 problems with your question.

1. You are actually looking for a general solution to a computer vision problem. This is not the goal of this Q&A forum. To understand what I am saying, please read the FAQ...
2. Basically what you want is creating histograms of data, which is simple data binning. If this sounds like chinese to you, start reading the internet about histograms ... Then combine them together based on regions in the image, which adds some sort of spatial information to the concept of histograms.
3. Then go and try to implement this in openCV and see where you get. Once this is done, and errors appear, then is the right time to come back to this place...

So for now -1 for your question, since it doesn't apply the rules...

All I need for the moment is to implement the algorithm in the paper above. I'm not going to become an expert in computer vision.

Seriously? Sorry to say but this is probably the most retarded answer I have read in a long time for now ... You cannot simply expect yourself to implement an advanced computer vision algorithm if you even haven't got a single clue on how to create this all, nor grasp the fact of creating histograms and binning. You just lost my need to help you out ...

You're taking yourself too seriosly,Steven. That's probably because of your age.

Could be :) but that doesn't change the fact that I am doing this out of free will and interest. It becomes frustrating to see someone just basically say, give me the solution in code and stfu :)

I don't need a solution in code,I needed a little help with the theory because of lack of time. But don't bother yourself.

"All I need for the moment is to implement the algorithm in the paper above. I'm not going to become an expert in computer vision." - you obviously want to pay someone else to do it then.

A wild guess, you probably started your high school project way to late and now want a quick fix. Like I said... this forum isn't designed for explaining computer vision theory. There are way better locations/fora for that with people probably willing to explain the complete theory behind histograms and combinations of that in computer vision. You don't have to become an expert ... histograms are kind of the very basics of computer vision. Without any effort on your part to educate yourself, implementing that paper will never work out.