Patent ID: 7092444
Filing Date: 2006-08-15
Classification: H04N

Abstract:
1. An image signal decoder for decoding an input image signal coded by a hybrid coding method using both intra-frame coding and interframe coding, comprising: a variable length decoding section for performing variable length decoding on said input image signal, and generating motion vector information, coefficient information, time information and header information; an interframe motion determination section for storing said motion vector information output from said variable length decoding section, and determining a magnitude of an interframe motion based on a distribution of said motion vector information, when determining that said interframe motion is larger than a predetermined level, said interframe motion determination section controlling an operation of said variable length decoding section so as to suspend said decoding by said variable length decoding section; an inverse quantization section for performing inverse quantization on said coefficient information output from said variable length decoding section; an inverse discrete cosine transform (inverse DCT) section for performing inverse DCT on said inversely quantized coefficient information output from said inverse quantization section; a motion compensation section for performing motion compensation based on inversely discrete-cosine-transformed coefficient information output from said inverse DCT section and said motion vector information, and generating an output image signal; and a frame buffer for temporarily storing said output image signal output from said motion compensation section.