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2016-08-03 13:06:30 -0600	commented question	Scale-rotation-skew invariant template matching Actually, I don't care if the arrow is symmetric, but it is important that the algorithm finds the relative rotation from the template. I've just tried the algorithm that you have suggested, but as it is, it returns -1 without a significative output. Maybe I'm not using it properly.
2016-08-03 11:56:11 -0600	received badge	● Editor (source)
2016-08-03 11:54:01 -0600	commented answer	Scale-rotation-skew invariant template matching Thank you for your answer! I tried also with moments, but I get bad results. I think this happens because there are slight differences between the template and the target in the image. I can also change the target, but i need to orient the tray always in the same way.
2016-08-02 20:07:50 -0600	received badge	● Student (source)
2016-08-02 16:31:17 -0600	asked a question	Scale-rotation-skew invariant template matching Hi all, I need to find the target in an image. The target can assume whichever orientation, and can be scaled. Moreover, the image can be acquired from different camera's angulations. Do you know if a template matching algorithm that is rotation, scale and skew invariant already exists in OpenCV? In industrial robotics applications, those kinds of algorithms already exist, and they work pretty well. Otherwise, what approach could work? An example of the images that I would use is attached to the post. Thanks everybody for the help. Nicola C:\fakepath\img13.png C:\fakepath\target.png P.S.: I'm sorry to have edited this question different times, I know it is a little confusing.