Patent ID: 8599929

Claim:
A distributed video decoder, comprising: a key picture decoding unit which reconstructs a key picture received from an encoder; a hash information selecting unit which determines necessary hash information using the reconstructed key picture and/or generated previous side information; and a side information generating unit which generates side information using the reconstructed key picture and/or hash information selected based on information determined by the hash information selecting unit; wherein the hash information selecting unit computes estimation reliability of current side information to be reconstructed by using the reconstructed key picture and/or the generated previous side information and transmits hash selection information for selecting necessary hash information by the hash selection criterion information; wherein the hash information selecting unit comprises: a motion estimation reliability measuring unit which measures reliability of a motion vector within the current side information to be reconstructed based on the reconstructed key picture and/or the generated previous side information; and a hash information determining unit which determines hash information necessary for generating side information with reduced noise based on the motion estimation reliability measured by the motion estimation reliability and the hash selection criterion information; wherein the hash information selecting unit includes: a hash information position determining unit which selects a portion which needs hash information by using the motion estimation reliability and a hash selection criterion information, a hash information type determining unit which determines a hash information type used in the selected portion, and a hash information amount determining unit which determines a hash information amount of the determined type corresponding to the selected portion.