Image restoration for complementary subsampling system
Masayuki Tanimoto, Akio Yamada · Electronics and Communications in Japan (Part I Communications) · 1989
Abstract When the sampling points of an image are divided into two complementary subsampling points, an image with low resolution is restored from one set of subsampling points, and the image with full resolution can be restored using both sets of subsampling points. In such a complementary subsampling system, either of the two restored images contains aliasing distortion. This paper discusses the restoration of subsampled values, in which the high‐frequency components are lost due to the prefiltering. A method is presented in which the subsampled value is restored by utilizing the other complementary subsampled values, which preserves the highfrequency components as the aliased components. The condition for the restoration by the proposed method is described. Based on the derived properties, a new complementary subsampling system is proposed. This new system can restore without distortion both the image with low resolution and the image with high resolution simultaneously. The usefulness of the method is verified by experiment. The method is useful in the realization of the HDTV system, which contains a high compatibility to the present TV system.