Abstract
In this paper, a new subband coding system called subband absolute moment block truncation coding (SAMBTC) is introduced to compress monochrome images and color images recorded in Y/a and L*u*v* uniform color spaces. The SAMBTC incorporates full-band ab- solute moment block truncation 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-deviation-based bit allocation scheme. Com- pared with AMBTC, SAMBTC achieves superior imaging without block- ing artifacts at low bit rates. Subject terms: visual communication and image processing; image coding; sub- band coding; dynamic bit allocation; absolute moment block truncation coding; moment-preserving quantizer; uniform color space.
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