Non-linear Scaling Algorithm Based on Sobel Operator and Uniform Interpolation

To solve the image defects and image stretching generated by image scaling,a non-linear scaling algorithm based on Sobel operator and uniform interpolation is proposed in this paper.It uses gradient energy to distinguish the strong regions and the weak regions.Non-linear uniform interpolation scaling algorithm is used in weak regions,while it preserves those strong regions.Experimental results show that the algorithm can solve the problem of the main parts distortion generated by image scaling,and ensure a smooth transition between the region edges.