TV图像插值的双方向扩散改进算法

Modified Algorithm with Bidirectional Diffusion for TV Image Interpolation

提出了一种双方向扩散图像插值方法,有效地减小了插值图像的边缘宽度,从而获得清晰而光滑的图像边缘.这种双方向扩散在图像边缘斜坡较亮一侧进行前向扩散,而在边缘斜坡较暗一侧进行后向扩散.同时,它能根据图像边缘的特征自适应地调整前向、后向扩散强度,从而避免了在插值的图像中产生虚的纹理或边缘.数值实验结果显示,该方法既能很好地减小插值图像的边缘宽度,又不会产生其他人工虚像.

In this paper a method of image interpolation based on bidirectional diffusion is proposed. With this method, the edge width of interpolated images is effectively reduced and crisp and smooth edges are obtained. In this bidirectional diffusion, forward diffusion occurs in brighter lateral on edge ramp and backward diffusion proceeds in darker lateral. And the intensity of diffusion is adjusted adaptively according to the image features, which avoid the appearance of artifacts and false textures in the interpolated image. Numerical experiments on real images show that images interpolated with the proposed method have smaller edge width and are almost artifact-free.