- 10 23 Refer To The Hough Transform Discussed In Section 10 2 7 Note Fig 10 33 In The 3rd Edition Is Fig 10 30 In Th 1 (416.16 KiB) Viewed 38 times
10.2 Point, Line, and Edge Detection 757 Figure 10.33 illustrates the Hough transform based on Eq. (10.2-38). EXAMPLE 10.13: Figure 10.33(a) shows an image of size 101 x 101 pixels with five labeled An illustration of points, and Fig. 10.33(b) shows each of these points mapped onto the basic Hough po-plane using subdivisions of one unit for the p and 6 axes. The range of 9 values is +90°, and the range of the p axis is tV2D, where D is the dis- tance between corners in the image. As Fig. 10.33(c) shows, each curve has a different sinusoidal shape The horizontal line resulting from the map- ping of point 1 is a special case of a sinusoid with zero amplitude. transform properties. The points labeled A (not to be confused with accumulator values) and B in Fig. 10.33(b) show the colinearity detection property of the Hough transform. b FIGURE 10.33 (a) Image of size 101 x 101 pixels, containing five points. (b) Corresponding parameter space. (The points in (a) were enlarged to make them easier to sec.) -100-- -50- 0- 50- 100- Q 80 60 40 20 B R 30 40 -60