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better explanations of ORB

Hi guys,

I'm working with OpenCV4Android but i'm experiencing so problems on correctly understand ORB methods and what can I know from that class.

Most of all, I want to know if: passing a generic shape as template, ORB can detect elements that have the same or similar shape, regardless the foreground (i.e. can I get a metric from ORB that gives to me something like "this element has 5/15 matches", so that I can give a correct threshold for my algorithm?)

I've already tried to use classical object recognition to detect shapes using hough, canny, harris, etc etc but they give me only s*ty results.

Thank you guys!