9/7提升小波变换图像处理算法的高速FPGA实现

提升结构(Lifting Scheme)是一种新的双正交小波变换构造方法.这种方法使得计算复杂度大大降低,有效地减少了运行时间.介绍了基于FPGA的高速9/7提升小波变换的设计,提出采用多级流水线硬件结构实现一维离散小波变换(1-D DWT).该结构使系统吞吐量提高到原来的3倍,面积仅增加40%.在实现二维离散小波变换(2-D DWT)时采用基于行的结构,可以提高片内资源利用率和运行速度,满足小波变换实时性的要求.

High-Speed FPGA Implementation of 9/7 Lifting-Based DWT Image Processing Algorithms

Lifting scheme is a new method for biorthogonal discrete wavelet transform (DWT), which greatly reduces the computational complexity.In this paper, an FPGA-based high-speed 9/7 lifting DWT algorithm was presented.Using multi-stage pipelining structure, one-dimensional discrete wavelet transform (1-D DWT) was realized to improve system throughput by 3 times, with only 40% increase in size.A line-based architecture was applied to realize 2-D DWT, which features better performance in terms of throughput rate and hardware utilization.