Because the required scanning range is cut down to a large extent by use of edge detection methods, the efficiency of the minimum-discontinuity phase unwrapping algorithm is significantly improved.
The edge of image is manifested as discontinuity in image, what edge detection means is to doled (in the image ) those discontinuous points or sharp variation points.
图像的边缘表现为图像上的不连续性，边缘检测就是检测图像上的不连续点或陡变点。
3
This paper discussed an edge linking algorithm based on autonomous edge growing for discontinuity edge of edge image caused by missed detection.