Abstract
In re-size (scaling) of a picture, a directional adaptive processing which realizes an improvement of subjective picture quality with a reduction of alias is discussed. In this processing, the clustering to change the processing by area type and the directional adaptive processing at edge area are applied. For this, we have used eight directional operators which are extended from four directional operators, however, its performance depends on picture condition. In this paper, the coefficients of operators are re-designed to improve the two dimensional frequency characteristics which has good direction balance. The area detection method and the interpolation pixel positions are also discussed to improve total performance. As results of experiments, it was recognized that the proposed method gives better PSNR and subjective picture quality without jaggy.
