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Erschienen in:
2016 | OriginalPaper | Buchkapitel
Finding Simple Curves: The Hough Transform
verfasst von : Wilhelm Burger, Mark J. Burge
Erschienen in: Digital Image Processing
Verlag: Springer London
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In Chapter 6 we demonstrated how to use appropriately designed filters to detect edges in images. These filters compute both the edge strength and orientation at every position in the image. In the following sections, we explain how to decide (e.g., by using a threshold operation on the edge strength) if a curve is actually present at a given image location. The result of this process is generally represented as a binary edge map. Edge maps are considered preliminary results, since with an edge filter’s limited (“myopic”) view it is not possible to accurately ascertain if a point belongs to a true edge. Edge maps created using simple threshold operations contain many edge points that do not belong to true edges (false positives), and, on the other hand, many edge points are not detected and hence are missing from the map (false negatives).