A Scaling Method for Video Images Based on Nonlinear Curve

Abstract

Abstract. When Digital Video image transformation from general screen (i.e., 4:3, etc.) to widescreen (i.e., 16:9, etc.), the source image aspect ratio will change, image resolution adjustment and format conversion is difficult. In this paper, a method of nonlinear scaling is proposed, aim to overcome the image edge distortion problem caused by conventional transform methods. The proposed method is to transform based on nonlinear scaling curve in the horizontal direction, it uses elliptic curve scaling function on both sides of the image and also add appropriate nonlinear scaling factor in central area, achieving the overall image of the nonlinear scaling factor change is smooth, to reduce the overall image distortion. The simulation result shows that the distortion of the scaled image is acceptable, the proposed method is more efficient than conventional methods.