A New Rate Adaptive Control Algorithm for JPEG2000
In this paper, a new rate adaptive control algorithm is proposed based on study of JPEG2000 rate control algorithm, in order to reduce the amount of bits sent to the arithmetic coder, without any significant changes into the standard architecture and without loosing performance. After wavelet transform, the coefficient is modeled as Gaussian distribution, but remove the offspring of the lowest frequency. Each block bit rate of the actual encoding has been achieved based on rate-distortion theory in the overall rate certain, and the bit rate should be real-time deadline in the entropy coding. The offspring of the lowest frequency has been code at without distortion. This algorithm achieve bit rate deadline in realtime, reducing the encoder computation and memory usage. Experimental results show that after the removal of the most low frequencies, the remaining band coefficient modeled as a Gaussian distribution, the image compression is significantly better than results that the whole band is the Gaussian distribution, when the compression rate is not too high. And rate allocation algorithm is accurate and low complex, and that it is most suitable for hardware implementation.
image coding DWT rate control bit rate allocation
LI Qi-hu ZHANG Yan-yan REN Guo-qiang WU Qin-zhang HAN Wen-jun
Institute of Optics and Electronics of Chinese Academy of Sciences Cheng du, Sichuan, China; Graduat College of Electronic & Information Engineering, Nanjing University of Information Science and Techn Graduate university of Chinese Academy of Sciences Bei jing, China
国际会议
南京
英文
23-27
2010-11-01（万方平台首次上网日期，不代表论文的发表时间）