一种低面积低功耗RGB到YCbCr色彩空间转换电路实现方法

Low-Area and Low-Power Circuit Implementation of Color Space Conversion between RGB and YCbCr

本文提出了一种低面积低功耗RGB与YCbCr色彩空间转换的电路实现方法。首先提出一种结合简化加法器图(Reduced Adder Graph, RAG)的公共子表达式消除(Common Subexpression Elimination, CSE)的电路实现,然后提出一个提高精度的补偿方法。最后采用TSMC 0.18um工艺对所提出的算法进行综合和布局布线。仿真和综合结果表明相比于传统的正则有符号数字(Canonic Signed Digit, CSD)编码系统,采用本文提出的结合CSE和RAG的RGB到YCbCr空间转换电路实现方法面积和功耗减小了20%,补偿算法提高了系统精度。

This paper presents a low-area and low-power circuit implementation of high-precision color space conversion from RGB to YCbCr. Firstly, an efficient circuit implementation combining com-mon-subexpression-elimination (CSE) with reduced-adder-graph (RAG) is presented. Secondly, a compensation method is proposed to enhance the precision. Finally, the synthesized results of a TSMC 0.18 um standard cell library are given. By using the proposed circuit implementation of color space conversion from RGB to YCbCr combining CSE and RAG without compensation, the results show that the area and power are reduced by about 20% than the traditional Canonic Signed Digital (CSD) method. With the compensation algorithm, the precision is much higher.