A Novel Dynamic Rate Control Algorithm for JPEG-LS Based on Empirical Data Table

JPEG-LS is suitable for the field of lossless/near-lossless image compression because of its simple algorithm and high performance. However, it is difficult for JPEG-LS to control precisely the bit rate, which makes it hard to be applied to bandwidth-constrained occasions such as the satellite image coding. To solve this issue, the mathematic relation between bit rate and the quantization parameter is obtained by analyzing the coding characteristics of JPEG-LS, with which a novel dynamic bit-rate control algorithm is proposed based on the look-up table algorithm. Experimental results show that the proposed new bit-rate control algorithm is superior to the current JPEG-LS rate control scheme on the accuracy of bit-rate and the speed of bit-rate convergence.