标清电视图像转为高清电视图像的插值算法

Interpolation Algorithm of Transforming Standard-definition TV Images to High-definition TV Images

由于高清电视图像与标清电视图像分辨率上的巨大差异,标清电视图像转为高清电视图像极为困难,像素形状的改变使得传统的图像放大方法很难保证高清电视图像的质量。通过对标清电视图像进行裁剪,利用像素中心点坐标进行双线性插值,保证了像素点的精确位置,消除了像素形状的改变造成的插值误差。考虑到巨大的放大倍数,本文对插值得到的高清电视图像做了后续的锐化处理。实验证明,本文的方法得到的高清电视图像比传统算法得到的高清电视图像在图像质量上有了大大改善。

It is very hard to transform SDTV images to HDTV images because of the great difference of resolution between them.Moreover,the change in pixel shape from rectangular to square makes the traditional methods of image enlarging impossible to ensure the quality of HDTV images.Based on this reason,we give a new interpolation algorithm： first cut the SDTV image,and then use the center coordinate of pixels to do bilinear interpolation.This method ensures the accuracy of pixel position,erases the interpolation errors which are caused by the change in pixel shape.Considering the huge enlarging multiples,we do sharpen treatment to the HDTV images.The experiment results show that the method can greatly improve the quality of HDTV images comparing with the traditional methods.