基于FPGA的相机特殊时序调整系统设计

Adjustment Design for Especial Sequence of Camera Video Based on FPGA

针对某型特殊时序的红外相机图像需要通过CameraLink图像采集卡进行采集并显示的工程需要,设计了基于FPGA的特殊时序调整及接口适配板卡。采用SignaTap测量红外相机的具体时序,在此基础上根据图像采集卡可以识别的时序对相机输出信号的时序进行调整。采用FPGA内部集成的FIFO模块实现像素时钟的改变和图像数据的存取。采用Verilog语音编程实现有效信号的提取和无效信号的屏蔽以及行、场同步信号的调整等,将特殊时序的相机信号调整为通用CameraLink图像采集卡可以识别的信号时序。试验结果证明,经过处理的图像信号可以由CameraLink采集卡正确采集并显示,显示图像正确、稳定。

To meet the requirement of the especial sequence IR camera signal being captured by the general CameraLink imaging acquisition card, the sequence adjustment and interface transforming system based on FPGA was designed. The SignaTap tool was applied to measure the detailed sequence of the IIR camera output and based on which the sequence adjustment system was designed according to the sequence requirement of the imaging ac,~uisition card. The FIFO module in FPGA was applied to realize the pixel clock modification and the data saving and taking. The Verilog programming was applied to realize the pick up of the valid signal, the cut-off of the invalid signal and the modification of the line valid and frame Valid signal. The camera especial sequence adjustment system adjusted the especial sequence to the sequence that can be identified by the common CameraLink imaging acquisition card. The ex- periment shows that the processed image signal can be captured by the imaging acquisition card and the displayed image is correct and stable.