The Design And Realization Of Video Data Acquisiton System Based On DSP

In last 20 years, the development of semiconductor technology has strongly prompted the application of digital image processing technology in the areas of industries, commerce,medicine, aerospace, science research and consumer electronics. The difficulties brought by machine vision processing are the huge data count and the very high-speed processing capacity and very large-capacity memorizer demanded. Some of the current digital image processing systems are based on embedded computer, some are based on FPGA, some are based on application specific compressing chip, and some are based on DSP. The implementations based on DSP are more flexible, can fulfill the requirements of special video formats and processing, and can be easily extended, upgraded and maintained. So is the direction of reach and development.This text has introduced standard PAL rule black-and-white TV signal in detail (the signal of video is gathered to the source), Based on DSP high-speed video signal gather systematic hardware plan of design, choice of the chip, Introduction of chip used and performance analyses , include digital signal deal with chip( DSP) TMS320C6713, Can programmable logic device(CPLD) EPM7128AETC100-10 , the video signal able to programmable inputs processor SAA7111A, dynamic random-access RAM, CAN communication urge chip SJA1000, linear power change chip TPS757XX series, bus urge and the level change chip, etc.. offer the complete process to debug the board.By using the full functional video decoder and cooperated with the DSP program, this system can be compliant with various video formats. By analyzing the timing and logic carefully, this system uses high-speed asynchronous FIFO implementing the interconnection between the video decoder and DSP to achieve the high speed buffering of the video data. By using the EDMA function of TMS320C6713, this system can transport video data at very high speed without CPU interference, thus improving the performance and diminishing the system burthen. This system implemented the I2C interconnection between the video decoder and TMS320C6713 ,by using TMS320C6711's exclusive interface,needn't the MCU coprocessor usually used in this type system. Through precise timing analyzing and calculation, this system chose high-speed CPLD to implement the cross connection between the chips,achieved the harmonious operation of the different parts. Finally, this paper deeply discussed the design theory of circuit and the EMI&EMC existed in the circuit.So a whole digital video image sample and processing system was gotten.Compared to the current same-type system, this system is simpler in structure and cheaper in cost. Profitted from the powerful processing ability of TMS320C6713 DSP, through developing different software, this system can be applied to all kinds of embedded image processing systems. So the system is more practical and advanced.