An image edge detector is described which produces chained edge points with sub-pixel accuracy.The method incorporates the main ideas of the classic Canny and Devernay algorithms. Theanalysis shows that a slight modification to the original formulation improves the sub-pixelaccuracy of the edge points.
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function cu_chain_edge_points has some problems #1
chain memory prev and next in GPU is Multiple accessed. the process will get false value before set new value