【摘要】 多点触控技术是人机交互领域的研究热点,其关键是实现对触控点的准确跟踪定位,针对基于计算机视觉多点触控系统,提出一种基于FPGA的多点触控检测系统。系统分为三个模块。第一个模块针对多点触控系统的环境,采用基于直方图统计面积比法的实现前景分割,第二个模块对二值化结果进行连通域行标记,第三个模块在Microblaze中完成,对行标记结果进行列标记以及计算连通域重心,行标记与列标记模块并行运算。该系统在Xilinx公司的XC3s1200e上实现,摄像机分辨率752*480@60Hz,实验证明,该系统处理速度较快,可以实现对多点触控系统的实时跟踪定位。更多还原

【Abstract】 Multi-touch is the hot research in current human-computer interaction applications.The key of Multi-touch is to detect and track the positions of finger touch blobs.In this paper,a vision-based multi-touch tracking system was developed on a Xilinx FPGA platform which consists of three functional blocks.The first block is for touch blobs extraction using a segmentation algorithm based on the blob area percentage in one frame.A dual port memory was used in this block to get the histogram of the current frame and to predicate the threshold value for next frame.The second block is to obtain the line connected component from the binary image.The third block is the label connection and blob center calculation completed on a MicroBlaze processor.Experiment results show that this system can detect the touch blobs in real time with the resolutions of 752 by 480 up to 60Hz.更多还原