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Yes I think it is that. You should refer to the original paper:

• Faster and better: a machine learning approach to corner detection
• or this presentation

For changing the FAST type in OpenCV 3:

cv::Ptr<cv::Feature2D> fast = cv::FastFeatureDetector::create(10, true, cv::FastFeatureDetector::TYPE_5_8);

Yes I think it is that. You should refer to the original paper:

• Faster and better: a machine learning approach to corner detection
• or this presentation

For changing the FAST type in OpenCV 3:3 (doc):

cv::Ptr<cv::Feature2D> fast = cv::FastFeatureDetector::create(10, true, cv::FastFeatureDetector::TYPE_5_8);