| 摘要 |
In an apparatus for adaptively coding an image signal including a contour signal and a texture signal having object pixels and background pixels 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, a padding circuit replaces each background pixel value with a pixel value derived from object pixel values by using a predetermined padding method to thereby generate a padded texture signal. And then, a luminance data extracting circuit extracts the luminance data from the padded texture signal to provide a modified texture signal, each pixel of the modified texture signal having the luminance data. Thereafter, a frame/field correlation evaluating channel, based on the contour signal and the modified texture signal, evaluates a frame-correlation of a frame of the modified texture signal and a field-correlation of the top-field and the bottom-field thereof and then decides to encode the image signal on a frame-by-frame basis if the frame-correlation is higher than the field-correlation to thereby generate a frame coding mode signal and if otherwise, decides to encode the image signal on a field-by-field basis to thereby generate a field coding mode signal.
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