基于FPGA的高精度图像采集系统设计

摘要

In order to obtain higher accuracy image, an improved CMOS image acquisition system is presented combined with FPGA and high resolution AD. Firstly,the serial interface is used to configure the CMOS sensor and AD according to the work environment. Then the serial LVDS image was processed to satisfy requirement of the system application and storage and display unit in the Xilinx FPGA using several methods such as de-LVDS,de-serial and clock domain convert. Experimental results proved,when clock of the serial LVDS image is 240 MHz,the system can output 14-bit,30 MHz image accurately and smoothly. The system has advantages of reliable and steady function,strong real-time and good universality.%为了获取更高精度的图像,设计了一套基于FPGA结合高精度AD的CMOS图像探测器图像采集系统。首先通过串口配置图像探测器和AD的寄存器,使其按照成像要求进行工作,然后将高速串行差分图像输入Xilinx FPGA,综合运用差分转换、高速数据解串、数据时钟域转换等设计方法,使图像满足系统应用和存储与显示要求。实验结果表明,当AD的输出时钟高达240 MHz时,系统能够准确、平稳的输出30 MHz的14 bit高精度图像。整个系统性能稳定可靠、实时性强,具有较好的通用性。