Patent ID: 6310981
Filing Date: 2001-10-30
Classification: H04N

Abstract:
A coded image data-decoding apparatus, comprising:a receiver for receiving coded image data, and information identifying tools constituting a decoding algorithm for decoding the coded image data;a storage device for storing multiple tools in a hierarchical manner such that tools for an N+1 ranked layer perform decoding with a lower image quality as a substitute for tools of an N ranked layer;a selector for selecting multiple tools by comparing the tool identifying information with the stored tools;a constructor for constructing the decoding algorithm from the selected multiple tools; anda decoder for decoding the coded image data by applying the constructed decoding algorithm,wherein when the receiver receives information identifying M-ranked tools, the M-ranked tools are not stored in the storage device, and the selector selects L-ranked tools, where L is greater than M in rank, so as to construct the decoding algorithm.