摘要
针对目前小波变换联合传统SPIHT编解码算法复杂度高、压缩率不高的问题,利用现场可编程门阵列技术(FPGA)对算法进行改进。方法采用性能优异的9/7提升小波进行三级变换,将二维提升小波变换改为一维,提高了硬件实现的并行度,减小了复杂度,提升了处理时间;在SPIHT算法中对不重要的高频系数进行截位处理,去除了不必要的冗余,提高了SPIHT的编码效率。实验结果表明,与传统SPIHT算法相比,设计的改进系统所得的数据压缩率更高,更易于硬件实现。
Aiming at the problem that wavelet transformation combined with traditional SPIHT encoding/decoding algorithm has high complexity and low compression rate,FPGA(Field Programmable Gate Array)is used to improve the algorithm.In this method,the9/7lifting wavelet with excellent performance is used to implement the three stages,three-stage transformation,and the2-D lifting wavelet transformation is changed into one dimension,thus raising the parallelism of the hardware implementation,reducing the complexity,and improving the processing time.In the SPIHT algorithm,while the truncating processing is done on thus to remove the unnecessary redundancy and raise the coding efficiency of SPIHT.The experimental results indicate that compared with the traditional SPIHT algorithm,the modified system has a higher data compression rate and is easier for hardware implementation.
作者
赵柏山
徐丽
张帆
ZHAO Bai-shan;XU Li;ZHANG Fan(Shenyang University of Technology, Shenyang Liaoning 110870, China)
出处
《通信技术》
2018年第3期569-574,共6页
Communications Technology
