摘要：Sobel operator is widely used to detect the edge direction in most spatial error concealment methods. However, Sobel operator may not work when detecting edge directions in the case of existing line in the image. This paper designs an advanced method of detecting edge directions, which can estimate the direction of both step edge and line correctly. The benefit of the advanced edge detection method is that all edge directions including step edges and lines can be detected properly. The proposed method is applied in a spatial error concealment method. Experimental results show that the advanced method yields better objective and subjective quality than that of using Sobel operator for determining edge direction only.
