二维离散小波逆变换的硬件实现

Hardware implementation for 2D inverse discrete wavelet transform

设计了一种实现二维离散小波逆变换(IDWT)的专用电路结构。本结构基于提升的小波变换方法,采用流水线设计技术,以非折叠的一维小波逆变换器为核心,可支持5/3和9/7小波逆变换。主要运算部件采用定点化实现方法,通过C模型进行有限精度分析。经测试,在时钟频率为45 MHz的情况下,对于512×512像素的图像,处理速度可以达到60帧/s。该二维离散小波逆变换电路已应用于JPEG2000解码系统。

A dedicated architecture to implement an efficient 2D Inverse Discrete Wavelet Transform （IDWT） is designed. The architecture is based on a lifting scheme and suitable for 5/3 and 9/7 filters. A pipelined and unfolded 1D IDWT transformer is presented. The fixed point method is adopted for arithmetic unit, and finite precision effects are analyzed by C simulation. For an image of 512 × 512 pixel, the decoding speed is 60 frame/s. This 2D IDWT circuit has been used as a IP core in JPEG2000 decoding system.