Improved Non-linear Image Enhancement for ...

It is well known that the B-spline filter can yield a very accurate algorithm for smoothing. In this paper, it is shown that a cubic B-spline filter can be used to improve the non-linear image enhancement method. In the non-linear image enhancement, a higher-frequency component can be predicted to solve the blurred problem of an enlarged image. This paper also presents a new three-dimensional (3-D) down-scaling scheme to subsample video data for video coding. Furthermore, a novel non-linear image-enhancement compensation algorithm with cubic B-spline filter is presented to improve the prediction of higher-frequency component and accordingly the efficiency of the 3-D down-scaling video coding. Finally, a computer simulation shows that the proposed method yields a better quality of the decoded image than other non-linear enhancement methods.