Research And Design Of Video Conversion Interface Based On FPGA

With the rapid development of computer, multimedia and digital communication technology, on the one hand video technology is advanced and boosted, on the other attachment of interface appears many problem to be solved among different digital display equipment. But it was paid no enough attention to on the market, and it is seldom seen between different interfaces.A solution of embeded Video Conversion Interface based on FPGA was introduced detailed in this paper, which had the function of video conversion for format NTSC. The analog video signals were converted to the 8 bit standard digital video signals according with ITU_R656 by video A/D processor ADV7181B. The system used Altera Corporation's FPGA as the development platform. It was composed of I2C configuration module, deinterlace module, image frame storing control module, color space conversion module and VGA timing configuration module. Among them, the cache design uses at the line insertion method for the realization of interlaced scanning transform progressive scanning. The color space conversion was used by pipeline technology, Digital video signals were sent to the image frame storages. After the color space conversion by FPGA, the system changed its schedule. The VGA controller module sent the video signals to the VGA, which made the video signals displayed by ADV7123.Verilog HDL has been adopted in the design of the main controller in the paper. The system was developed under the platforms of Quartus II 6.0 and Modelsim SE 6.0 software. It was implemented in FPGA and made it flexible. The system can not only boost digital interface conversion velocity but also fulfill system upgraded online conveniently by chip of allocation, raise system applied value.