Perceptually Optimized Rate Control for JPEG2000 Coding of Color Images

In this paper, a perceptually optimized three-stage rate control algorithm is proposed to reduce both the computational complexity and the memory usage over the conventional post-compression rate-distortion (PCRD) method for maintaining the visual quality. The first stage is to allocate coding bits to each code block according to the associated signal energy. The second stage approaches the final truncation point through calculating rate-distortion slopes. The third stage incorporates the evaluation of perceptible distortion into the rate-distortion control scheme of PCRD method to achieve the optimal truncation point without encoding all the image data. Simulation results show that, in both computational complexity and memory usage, the performance of the proposed rate control algorithm is superior to that of the JPEG2000 rate control algorithm while achieving the same visual quality at the target bit rate.