基于FPGA的二维码图像旋转系统  

2-D barcode image rotation system based on FPGA

作　　者：陈怡[1] 张萌[1] 

机构地区：[1]电子科技大学电子薄膜与集成器件国家重点实验室,四川成都610054

出　　处：《电子技术应用》2012年第7期12-13,16,共3页Application of Electronic Technique

摘　　要：阐述了在图像预处理阶段将二维码图像旋转至端正的必要性。设计了一种求取QR二维码图像旋转角度的算法以及一种可将二维码图像旋转任意角度的算法。求取旋转角度算法简捷有效,能以较低的硬件代价实现。图像旋转算法利用了CORDIC算法以及双线性插值算法,采用高速流水线架构在FPGA上实现。整个设计在Altera公司的DE2平台下进行了验证。实验结果表明,这两种算法结合使用可以快速有效地将带有一定歪斜角度的二维码图像旋转端正,速度可以达到90.9 MHz,旋转后的图像细节清晰,能有效提高二维码的识别率。Image rotation is a necessity for 2-D barcode identification. This paper presents a novel VLSI structure for image rotation which can calculate the tilt angle of 2-D barcode image and rotate image to the horizontal way. The circuit to calculate the tilt angel of 2-D barcode is simple and effective and can be implemented with low hardware complexity. Image rotation algo- rithm takes use of improved CORDIC algorithm and Bi-linear interpolation and is implemented by high-speed pipelined architec- ture. The proposed architecture is implemented on the Altera Strafix IV FPGA. The whole design is validated in Ahera＇s DE2 workbench. Experimental results show that the proposed architecture can rotate 2-D barcode images with arbitrary tilt angles to the horizontal way at 90.9MHz. Moreover, it can keep image details clear thus improving 2-D barcode identification rate.

关 键 词：图像旋转 FPGA 二维码 CORDIC 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]