Cubic B-spline approximation in scalers: Efficient design and implementation

Scaling is a very important process in digital image/video processing. This paper studies the application of cubic B-spline in image/video scaling. Cubic B-spline is very popular in image/video scaling, but in most cases it is not applied properly. We explain why a pre-filtering process is necessary when cubic B-spline kernel is applied to interpolate the image or video, and we also give a fast algorithm of the pre-filtering process. In addition, an efficient VLSI implementation of our interpolation method is proposed. To sum up, our method is not only theoretically robust but also easy to implement in hardware.