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Size of AGAST keypoints using OpenCV

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I'm using the AGAST algorithm to extract keypoints from an image using OpenCV. For other keypoint detectors the size of the interest-region changes from keypoint to keypoint. But with AGAST keypoint.size evaluates to 7.0 always. Is there something I'm missing with regards to AGAST as an algorithm? See attached code:

    agast = cv.AgastFeatureDetector_create()
    kp = agast.detect(img1, None)

Forgot to mention: Using OpenCV version 3.4.5 (think I get the same results in 4.0 also though)

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