Abstract:
This paper proposes coding performance of JPEG-LS image compression algorithm. One-rank rate control scheme and two-rank rate control scheme are proposed to perform dynamic rate control efficiently during the near lossless coding procedure. Experimental results show that these rate-control solutions have low operation requirement and good property of convergence. The fluctuation of bit-rate is effectively reduced. The compressed bit-stream is outputted stably under target bit-rate, and image compression quality is promoted.
Key words:
image,
rate,
control
摘要: 对JPEG-LS图像压缩方案的编码特性进行数据分析,提出一阶码率控制策略与二阶码率控制策略,有效地实现了近无损图像编码过程中的码率动态调整。实验证明,该码率控制解决方案运算量小、收敛性好,能够有效抑制码率的大幅波动,在目标码率下可以稳定输出压缩码流,保证了编码图像的质量。
关键词:
图像,
码率,
控制
CLC Number:
XU Yan-ling; LIU Bei. Dynamic Rate Control Scheme for JPEG-LS Image Compression[J]. Computer Engineering, 2008, 34(7): 238-239,.
徐燕凌;刘 蓓. JPEG-LS图像压缩动态码率控制策略[J]. 计算机工程, 2008, 34(7): 238-239,.