Image interpolation using adaptive fast B-spline filtering

An adaptive version of a B-spline interpolation algorithm is proposed. Adaptivity is used in two different phases: (1) adaptive zero order interpolation is realized by considering directional edge information, and (2) adaptive length of the moving average filter in four directions is obtained by computing the local image statistics. The proposed algorithm exhibits significant improvements in image quality compared with the conventional B-spline type for algorithm, especially with high magnification ratio, such as four times or more. Another advantage of the proposed algorithm is its simplicity in both computation and implementations.<>