基于FPGA的实时模板匹配系统设计

Design of Real Time Template Matching System Based on FPGA

针对模板匹配实时性不佳、且与模板大小相关的问题,提出采用积分图像进行模板匹配,并设计一种基于FPGA的实时模板匹配系统。在对积分图像计算方法进行优化的基础上,该系统用FPGA边接收原始图像边进行积分图像计算,并据此实现单个时钟周期求解任意一个搜索区域的相似度,进而实现模板的实时匹配。实验结果表明,文章设计的模板匹配系统不仅匹配准确、实时性强、匹配速度与模板大小无关,而且硬件资源消耗较少,在嵌入式实时图像处理领域有较好的实用价值。

To address the poor speed of template matching and its dependency on the size of template,a method implementing template matching using integral image is proposed, and a real-time template matching system based on FPGA is designed. On the basis of optimizing the calculation of integral image, the designed system uses FPGA to compute integral image while input image is being received, calculates accordingly the similarity of any searching area in only a single clock cycle, and then realises real-time template matching. Experiment results show that the designed template matching system is not only accurate, real-time, independent of the template size, but also needs fewer hardware resources. Furthermore, it has a good practical value in the area of embedded real-time image processing.