适用于嵌入式系统的二维DCT算法

2-D DCT algorithm for embedded system

提出一种简单、快速的二维DCT算法,即将二维DCT的变换系数和图像的像素值事先 乘好,形成查找表,在实现直接二维DCT变换时,把表调入内存,乘积的结果就能通过寻址的方式得 到而无需乘法器,速度很快,非常适合嵌入式系统的设计。在设计查找表时,优化了其结构,减小了存 储空间。实验结果表明了算法的有效性。

A simple and fast 2-D DCT algorithm was presented.Firstly the transform coefficient of 2-D DCT was multiplied by the value of pixels,which formed a lookup table.When realizing the direct 2-D DCT,it put the table into memory,and got the product value by addressing without multipliers.This algorithm can work with high speed, so it is specially suitable for the design of embedding system.The structure was optimized and the memory space was reduced.Experiment results show that the algorithm is effective.