摘要
针对 JPEG-LS算法的编码比特率特性提出了一套编码比特率控制算法 ,通过此算法可实现固定比特率的码流传送 .控制算法的核心由两部分组成 :预编码阶段和后编码阶段 .在前一阶段 ,利用提出的模型推算出满足缓存的估计编码比特数及对应的量化值 .在后编码阶段获取估计编码比特数与实际值之间的差值 ,利用此值调节以后的估计编码比特数 .此算法具有运算量小。
This paper introduced an algorithm which can achieve a constant bit rate when encoding video with JPEG LS standard. The algorithm is organized in two stages: pre and post encoding stage. In the preencoding stage, with rate model, calculating the potential encoding bit numbers(EBN) and corresponding quantization value(NEAR) based on the buffer fullness. In the postencoding stage, extracting the error between the estimated and actual value which will be used to adjust the estimated encoding bit numbers. With the algorithm, JPEG LS encoder can encode video sequence under constant bit rate.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2000年第7期907-909,共3页
Journal of Shanghai Jiaotong University
