AGAST_7_12s        10 modules/features2d/perf/perf_agast.cpp        AGAST_7_12s = AgastFeatureDetector::AGAST_7_12s, OAST_9_16 = AgastFeatureDetector::OAST_9_16 };
AGAST_7_12s      3260 modules/features2d/src/agast.cpp static void AGAST_7_12s(InputArray _img, std::vector<KeyPoint>& keypoints, int threshold)