Patent ID: 6415056
Filing Date: 2002-07-02
Classification: H04N

Abstract:
A predicted decoding method for decoding a bitstream data obtained by encoding a target image to be encoded referring a reference image, wherein a size or a location of the reference image is not as same as one of the target image to be encoded, a location of the target image on a first coordinate system is defined on a common spatial coordinate system, the reference image is located at the common spatial coordinate system, the predicted decoding method comprising:(a) extracting an offset signal and a compressed image signal related to a target image to be decoded from the bitstream data, wherein the offset signal indicates relationship between an origin of the common spatial coordinate system and an origin of the first coordinate system which is a spatial position in a top and left corner of the target image to be decoded; (b) obtaining a predicted image from the reference image referring the offset signal. (c) producing a decompressed differential image on the first coordinate system, by decoding the compressed image data through a process of inverse quantization and inverse DCT; (d) reproducing a reproduced image on the common spatial coordinate system by summing the predicted image and the recompressed differential image, by referring the offset signal.