From [this](http://stackoverflow.com/questions/25669494/generalized-hough-transform-for-shape-detection) question on stack overflow i know there is no opencv implementation for generalized hough tranform but in the opencv documentation [here](http://docs.opencv.org/3.1.0/d7/dd4/classcv_1_1GeneralizedHough.html) there is cv::GeneralizedHough class what does this class do? I know SIFT and SURF are good at object recognition but recognize small and specific shaped objects in image i think generalized hough tranform is good. Example for the image below which algorithm is good? 
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