基于FPGA的模拟视频采集控制器的研究与实现

摘要

针对目前单处理芯片图像采集实时性不高和FPGA中的毛刺等问题,文中提出了一种基于FPGA的模拟视频采集控制器的解决方案.该设计将图像采集功能区从主控芯片中分离出来,利用处理速度占优势的FPGA实现图像采集,减小了对主控芯片的资源占用.同时该控制器采用模块化设计,通过对程序设计的优化,使控制器能够区别奇偶场数据,将一帧图像顺序的存入SRAM中.在控制器的输出端采用D触发器构成数据缓冲器,用于调节数据的同步输出,有效减少了毛刺信号的产生.实验结果表明该设计工作稳定、能够提高图像处理系统的实时性,具有良好的模拟视频采集效果.%For the low real-time of single-chip image acquisition and the buns of FPGA,a design of analog video capture controller based on FPGA was presented. It separated the image acquisition functional areas from the main chip and used FPGA with a processing speed advantage to complete image acquisition. So it reduced the main chip resource consumption. Meanwhile, the controller used modular design. By optimizing the program design, making the controller can distinguish the odd and even field data and putting an image into the SRAM in the order. At the controller' s output, it used the D flip-flop to constitute a data buffer. So it can adjust the data synchronization output and reduce the burr signal effectively. Experimental results show that the design is stable and improves the real-time of image processing system. It has a good analog video capture effect.