Patent ID: 6069976
Filing Date: 2000-05-30
Classification: G06T,H04N

Abstract:
An apparatus for adaptively coding an image signal including a contour signal and a texture signal having object pixels within an object and background pixels within a background thereof, wherein the contour signal discriminates between the object pixels and the background pixels and each of the background pixels and the object pixels is represented by luminance data and chrominance data, the apparatus comprising:means for performing padding to replace each pixel value of the background pixels with a pixel value derived from values of the object pixels by using the contour signal in accordance with a predetermined padding method to thereby generate a padded texture signal;means for extracting luminance data from the padded texture signal to thereby provide a modified texture signal, wherein each pixel of the modified texture signal has only the luminance data; andmeans, based on the contour signal and the modified texture signal, for frame/field correlation evaluating to evaluate a frame-correlation of a frame of the modified texture signal and a field-correlation of the top-field and the bottom-field thereof in accordance with a predetermined rule and then decide to encode the image signal on a frame-by-frame basis if the frame-correlation is higher than the field-correlation, thereby generating a frame coding mode signal and decide to encode the image signal on a field-by-field basis if the frame-correlation is not higher than the field-correlation, thereby generating a field coding mode signal, wherein the frame-correlation and the field-correlation are calculated in accordance with a predetermined rule.