一种JPEG2000码率控制算法的硬件实现  

A hardware implementation of JPEG2000 rate control algorithm

作　　者：田长松 张为[1] 姜喆[1] 

机构地区：[1]天津大学电子信息工程学院,天津300072

出　　处：《信息技术》2014年第3期100-103,共4页Information Technology

摘　　要：基于并行的tier-1编码,提出了一种易于硬件实现,快速截断的码率控制算法,用查找表与移位运算代替原始算法中的除法运算,用率失真斜率记录表方法代替寻找最优截断点时的迭代运算,可以快速查找截断点。考虑到图像率失真斜率的概率特性,针对率失真斜率记录表某些项的位宽进行缩减,有效降低了资源消耗。A hardware-oriented and fast-truncating tier-2 encoder rate control algorithm is proposed based on parallel tier-1 coding. Instead of the original division operation in the standard, a lookup-table method combined with shifting operation is proposed. A rate-distortion slope table is applied for quickly searching the optimal truncation point instead of the iterative calculation defined in the standard. Considering the probability characteristics of the rate-distortion slope, the bit width of certain items in the rate-distortion slope table can be truncated, thus less resource is consumed.

关 键 词：JPEG2000 tier-2 并行 截断 硬件实现 

分 类 号：TN919.81[电子电信—通信与信息系统]