BT.656数字视频流的处理及其硬件实现

Processing and Hardware Implementation of BT.656 Digital Video Stream

BT.656格式数字视频流是一种广泛应用的视频流。然而,显示设备(如LCD液晶显示器、大面阵LED显示屏以及部分微投影器件)仅能直接显示RGB色彩空间的视频信号。BT.656视频流转为RGB视频流要进行解交织、隔行到逐行、色空间转换等处理。文章介绍了BT.656数字视频格式协议,着重阐述了在现场可编程门阵列平台上处理成24位RGB色空间逐行视频的实现方式。利用Verilog-HDL语言进行电路描述,在单片多端口SDRAM时序控制器进行视频数据的储存,并完成后续处理,视频系统在自主研制的微投影系统上进行了验证,实现了24位真彩色852×480、30帧每秒实时处理和传输。文章实现的方案稳定可靠、便于移植、开发周期短,硬件开销小,色空间转换中避免了繁琐的浮点运算,仅占用1 783个逻辑单元。

BT. 656 is a wildly used digital video Stream. However, display devices, such as LCD monitor, LED display area array, as well as part of the micro-projection devices, can only be displayed directly to the video signal of the RGB color space. The conversion from BT. 656 to RGB Video Stream consists processing of de-interleave, interlaced to progressive, color space conversion. BT. 656 protocol was introduced, and platform based on field pro- grammable gate array implementation of the progressive video of the 24-bit RGB color space was expounded. System on Chip which video information was stored by utilizing multi-port SDRAM timing controller, and then in turn to complete the follow-up processing was de signed by Verilog Hardware Hardware Description Language. The system was verified on an independent developed Micro-Projection system, 24-bit true color of resolution up to 852 X 480 at 30 frames per second in real-time processing and transmission was achieved. Then, the system is flexible, reliable, of short development cycle and cost-saving in hardware （merely accounted for 1 783 logic elements）, which avoids cumbersome floating-point opera- tions in color space conversion.