为配合多波段图象实时融合系统的研制，设计和开发了高速、高集成度，并具有广泛通用性的前端视频信号采集系统。该系统的设计和开发采用了专用视频解码芯片和大规模可编程逻辑器件（EPLD）以及VHDL语言。系统具有集成度高、可靠性好、性能优良、体积小、接口简单、采样参数在线可编程修改等特点。其应用于多波段图象采集和融合系统中，作为前端图象采集部分取得了良好的效果。同时，该设计也可作为前端图象采集部分用于其他图象处理系统中。

In the design of a front end of a real time image fusion system, a high speed, high integrated, general purpose video signal grabbing system has been developed by using one integrated video decoder, a large scale EPLD device. The EPLD device is configured by a program written in the VHDL language. The grabbing system can provide randomly continually data buffer memory access without waiting by using two buffer memory banks, which map to same address space. The grab parameters, for example, the beginning point, the dimension of grab window, can be change on line. It has following advantages: high integration and reliability, small dimensions, simple interfaces and in system programmability, etc. The system can be realized in one EPM7064SLC84 EPLD device without I 2C interface. The full function EPLD chip with I 2C interface is implemented in one EPM7160SLC84 and successfully applied to a multi channel image grabbing and fusion system. The on chip resource usage rate is 80%. On the other hand, the design can be also applied to the other image processing systems as a high integrated video signal grabbing front end without hardware change. The need change can be implemented by change the VHDL program which configures the EPLD device.