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      1 #!/usr/bin/env python
      2 
      3 import cv2.cv as cv
      4 
      5 def precornerdetect(image):
      6     # assume that the image is floating-point
      7     corners = cv.CloneMat(image)
      8     cv.PreCornerDetect(image, corners, 3)
      9 
     10     dilated_corners = cv.CloneMat(image)
     11     cv.Dilate(corners, dilated_corners, None, 1)
     12 
     13     corner_mask = cv.CreateMat(image.rows, image.cols, cv.CV_8UC1)
     14     cv.Sub(corners, dilated_corners, corners)
     15     cv.CmpS(corners, 0, corner_mask, cv.CV_CMP_GE)
     16     return (corners, corner_mask)
     17