Camera Link Full至HD-SDI接口的高清传输显示系统

为实现远距离、高可靠性传输,并减小复杂度,对Camera Link Full接口数据的HD-SDI传输显示进行了深入研究。采用FPGA作为核心处理器,考虑相机输出具有多种帧频,采取帧频检测及充分降频策略,并通过3个SRAM进行缓存以实现帧频转换,以满足HD-SDI帧频25Hz的要求。考虑到SRAM数据宽度,采取FIFO行缓存策略将Camera Link Full80输出的10tap、80bits图像数据转换成单通道的8bits图像数据。最后,完成系统设计并进行实验验证。实验结果表明:系统实现了图像数据从50Hz、100Hz、500 Hz等多种帧频的Camera Link Full80到25帧HD-SDI接口1080i的格式转换及实时显示,且图像层次丰富,无失真。

HD-SDI transmission and display system from camera link full interface data

In order to achieve long distance transmission with high reliability while reducing complexity, HD-SDI transmission and displaying system for video derived from Camera Link Full interface were researched in detail. FPGA was the core processor. Considering the feature of multi frame rates of the camera, frame rate detection and frequency reduction policy were adopted to preprocess the video. The preprocessed data was buffered by use of three SRAMs to complete the conversion of frame rate. The result met the 25 Hz requirement of HD-SDI. Duo to the bus width of SRAM, FIFO line buffer policy was selected to transfer data from Camera Link Full80, which was 80 bits with 10 tap, to data of 8 bits with single channel. At last, the system was designed and verified in experiment. The experimental result shows that video of multi frame rates from Camera Link Full80, which includes 50 Hz, 100 Hz, 500 Hz, is converted to the form of 1080i for HD-SDI. The video could be displayed in real time without distortion, and image is clear and structured.