HOUGH_GRADIENT    221 modules/cudaimgproc/perf/perf_hough.cpp         TEST_CYCLE() cv::HoughCircles(src, cpu_circles, cv::HOUGH_GRADIENT, dp, minDist, cannyThreshold, votesThreshold, minRadius, maxRadius);
HOUGH_GRADIENT     34 samples/cpp/houghcircles.cpp     HoughCircles(img, circles, HOUGH_GRADIENT, 1, 10,
HOUGH_GRADIENT     34 samples/cpp/tutorial_code/ImgTrans/HoughCircle_Demo.cpp         HoughCircles( src_gray, circles, HOUGH_GRADIENT, 1, src_gray.rows/8, cannyThreshold, accumulatorThreshold, 0, 0 );