IMAGE DECODER

摘要

An image decoding device for receiving a bit stream including coded information of image data divided into tiles each containing N pixels x M pixels and each separately wavelet-encoded, and management information including information for specifying a memory location of the coded information which corresponds to each tile or each resolution, and information for managing and identifying each tile or each resolution. The image decoding device decodes a coded image corresponding to a necessary tile and a necessary resolution, and comprises a management information separating portion which separates management information from an input bit stream; a setting portion for setting a tile or a resolution to be decoded according to a user's instructions; an identifying portion for identifying a memory location of the coded information corresponding to the tile or the resolution to be decoded with reference to the management information according to the setting by the setting portion; a coded data extracting portion which extracts a portion of the coded information from the bit stream, and which corresponds to the set tile or the resolution based on the memory location of the identified coded information; and a wavelet-decoding portion for conducting wavelet-decoded images on a tile-by-tile basis, so that adesired image area is decoded in a desired resolution according to a user's instructions.