SUBBAND ABSOLUTE MOMENT BLOCK TRUNCATION CODING

In this paper, a new subband coding system called subband absolute mom ent block truncation coding (SAMBTC) is introduced to compress monochr ome images and color images recorded in YIQ and Lu*v* uniform color s paces. The SAMBTC incorporates full-band absolute moment block truncat ion coding (AMBTC) into subbands along with a new subband dynamic bit allocation algorithm which is derived from the Shannon rate-distortion bound. Simulation results show that the proposed Shannon-bound-based bit allocation algorithm outperforms the commonly used standard-deviat ion-based bit allocation scheme. Compared with AMBTC, SAMBTC achieves superior imaging without blocking artifacts at low bit rates.