一种新的高速二维离散小波变换器结构  

A New Architecture for High-speed 2-Dimension Discrete Wavelet Transform

作　　者：曹辉[1] 卢强[1] 黄士坦[1] 

机构地区：[1]西安微电子技术研究所,陕西西安710075

出　　处：《微电子学与计算机》2010年第12期57-61,共5页Microelectronics & Computer

摘　　要：提出了一种应用于JPEG2000静态图像编码系统的二维离散小波变换(2D-DWT)单元的FPGA实现.分析了2D-DWT算法的特点,提出了一种直接进行二维小波变换的高速算法,克服了传统二维小波变换算法对存储器的频繁访问的缺点.同时,硬件结构具有较高的并行度和吞吐率;运用流水线技术,进一步提高了系统性能,每个时钟能输出4个小波系数.该结构对于N×N的图像,处理速度仅需要(N/2)2个时钟周期.设计经过FPGA验证,可用于实时图像压缩系统中.A new architecture of the 2-dimension discrete wavelet transform（2D-DWT） is implemented on the FPGA for the JPEG2000 still image coding system.The feature of the 2D-DWT has been analyzed and a straightforward 2-dimension transform algorithm is employed to built the architecture reducing the frequency of the memory read/write in traditional implementation.Meanwhile,the structure got the high through-put,four wavelet coefficients per clock,high parallelism and great performance improvement by the pipeline.Only（N/2）2 clock periods will be needed when processing a N×N image.Experimental result shows that the proposed architecture is suitable for the real-time image compression application.

关 键 词：JPEG2000 图像压缩 小波变换 并行 流水线 

分 类 号：TN4[电子电信—微电子学与固体电子学]