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                      "value": "Orientations of corners in the range [-pi, pi]."
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              "value": "The orientation of corners is computed using the first order central moment i.e. the center of mass approach. The corner orientation is the angle of the vector from the corner coordinate to the intensity centroid in the local neighborhood around the corner calculated using first order central moment."
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        "value": "from skimage.morphology import octagon\nfrom skimage.feature import (corner_fast, corner_peaks,\n                             corner_orientations)\nsquare = np.zeros((12, 12))\nsquare[3:9, 3:9] = 1\nsquare.astype(int)\ncorners = corner_peaks(corner_fast(square, 9), min_distance=1)\ncorners\norientations = corner_orientations(square, corners, octagon(3, 2))\nnp.rad2deg(orientations)\n",
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    ".. [1] Ethan Rublee, Vincent Rabaud, Kurt Konolige and Gary Bradski",
    "      \"ORB : An efficient alternative to SIFT and SURF\"",
    "      http://www.vision.cs.chubu.ac.jp/CV-R/pdf/Rublee_iccv2011.pdf",
    ".. [2] Paul L. Rosin, \"Measuring Corner Properties\"",
    "      http://users.cs.cf.ac.uk/Paul.Rosin/corner2.pdf"
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