Aiming at the shortcoming that Camera Link has complex interface and can only transfer in short distance,an interface converting system converting Camer Link to HD-SDI is designed.A high performance FPGA EP2S60F1020 of Altera Company is used to acquire the image data and code the data based on SMPTE 274M standard.To solve the problem that the horizontal and vertical time are different between Camera Link and HD-SDI,3 pieces of SDRAM are used as frame buffer.And the output frame of HD-SDI is delayed for a frame.The coded data is output to a serializer LMH0030, and the HD-SDI data is the output.As the vertical time of Camera Link and HD-SDI is not accurate the same,a frame must be dropped after every 708 frames.But the images being processed by the FP-GA are not dropped.The result shows that the system can convert images coming from Camera Link to HD-SDI.And the data output can be acquired by a SDI acquiring card.%由于 Camera Link 相机具有接口复杂、传输距离近等局限性,设计并实现了一种基于 FPGA 的 Camera Link 转HD-SDI 接口转换系统。该系统采用 Altera 公司的 EP2S60F1020高性能 FPGA 完成图像数据的采集并按 SMPTE 274M 标准编码；为解决 Camera Link 相机输出数据同 HD-SDI 输出图像行、场时间不同的问题,采用3片 SDRAM 作为帧缓存模块,延迟1帧输出；编码完成的数据输出到并串转换芯片 LMH0030,从而得到 HD-SDI 格式的视频输出。由于Camera Link 相机输出数据同 HD-SDI 输出图像的帧频并不绝对相同,每隔708帧必须丢去一帧数据,从而导致输出时固定丢帧,但 FPGA 对图像的处理并不会丢帧。实验结果表明,本系统能够将 Camera Link 相机输出的图像数据转换成HD-SDI 输出,并用采集卡采集到图像数据。
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