基于FPGA的非标准视频转换算法

Algorithm of non-standard video transformation based on FPGA

目的:针对X线设备非标准视频信号无法接驳通用VGA视频接口的现状,提出一种基于现场可编程门阵列(FPGA)的视频转换算法。方法:在分析了FPGA器件特点及非标准医学视频信号特性的基础上,通过对先进先出存储器(FIFO)中非标准视频A/D采样数据读写时序的控制,使得在每行的有效信号时间段内,输出800个数字采样数据(输出分辨率为800×600、刷新频率60 Hz),由输出模块将这800个数字数据与行、场同步信号一起组合成标准的VGA信号。结果:采用VHDL语言在一般的FPGA器件上能够实现非标医学视频信号到标准视频信号的转换算法。结论:实验结果表明,该算法运算速度快,转换效果清晰流畅。

Objective To study a kind of video transformation algorithm based on FPGA in view of the present situation that the video output of X-ray equipment can not be connected to common video adapter.Methods Through the control of non-standard video signal AD sampling data read-write succession in FIFO,800 digital sampling data was output（output resolution：800×600,refresh rate：60Hz）in the period of every line of effective signal.The output module combined these data with line and field synchronized signal and transform them into standard VGA signal.Results Non-standard medical video signal could be transformed into standard medical video signal by using VHDL in normal FPGA.Conclusion The speed of this algorithm is high,and the transformation effect is clear and smooth.