Patent ID: 8718139

Claim:
An image decoding device for obtaining image signals by decoding compressed data of digital moving image signals in a 4:4:4 format, comprising: a high-order header analyzing unit for decoding an identification signal included in the compressed data, the identification signal indicating whether three color component signals have been encoded in a common encoding mode or in independent encoding modes, wherein said common encoding mode corresponds to a process of encoding the three color component signals of one frame by a common macroblock type information and wherein said independent encoding mode corresponds to a process of encoding the three color component signals of one frame by an individual independent macroblock type information; and a picture decoding unit for decoding the three color component signals in a common encoding mode or in independent encoding modes according to the identification signal, and for also performing an inverse quantization process by using a common quantization matrix when decoding the three color component signals in a common encoding mode, and also performing an inverse quantization process by using independent quantization matrices when decoding the three color component signals respectively in independent encoding modes.