PAL-LVDS视频转换适配器的设计与实现

Design and implementation of PAL to LVDS video conversion adapter

针对前端采集的模拟视频图像无法在后端数字式显示器上显示的问题,提出一种基于MCU+WSC2810平台的视频转换适配器设计方案.首先通过解码模块将模拟信号变为数字信号,然后进行去隔行变换、帧频提升、分辨率变换等算法实现,再对其做OSD图像叠加处理,最后经过LVDS编码输出,从而实现了把隔行扫描、分辨率为720×576、25Hz的PAL制模拟视频信号转变为逐行扫描、分辨率为1024×768、60Hz的LVDS视频信号输出.通过对开发的硬件系统进行实测,验证了该方案的有效性.

Given the problem that the front-end acquisition of analog video images can't mate the back-end digital monitor,a video conversion adapter based on MCU + WSC2810 platform,PAL decoder chip,LVDS encoding chip and DDR SDRAM is brought forward.Firstly,the analog signal is converted into a digital signal via encoding pattern,with steps following named interlaced scanning transform of signal transformation,higher frame rate,resolution,and etc.Secondly,to do the OSD image overlay processing,and thirdly video signal is output through LVDS coding.All of procedures therefore make it realized that the interlaced scanning whose resolution is 720 × 576,25 Hz PAL analog video signal is successfully transformed into progressive scan,a resolution of 1024x768,60 Hz an LVDS video signal output.Based on the development of hardware system being measured,it is made sure the effectiveness of the scheme.