高分辨率CCD数据合成系统的设计

为充分利用航测拍摄间隔的非工作状态时间,本文设计了一个应用于航空摄影测量的大面阵CCD数字相机合成系统。该系统将3路高速CCD相机数据同步后,通过在FPGA内设计SDRAM读写模块和SDRAM控制器,以SDRAM作为高速缓存,并构造图像数据合成单元,实现将多路高速CCD相机图像数据合成为一路数据输出。整个系统时序逻辑控制均在FPGA中完成,改变了传统一套记录单元对应一路相机记录的模式,实现了用一套记录系统同时对3路高速CCD图像的实时记录。在实际航测拍摄间隔大于4s的情况下,仅在约633ms时间内完成了图像合成和实时记录,大大提高了记录系统的效率,降低了系统功耗。

Design of high resolution CCD image data combination system

In order o take full advantage of aerial shooting of non-working state time interval,a kind of data combination system of high-resolution digital camera used for aerophotogrammetry was designed in the paper.After synchronization of three-channel high-speed CCD camera data,SDRAM as a mass storage body,through design of SDRAM reading/writing modules and SDRAM controller in FPGA,high speed CCD image data from multiple channels were combined to one output in sequences,thus the imaging data from multiple CCD cameras could be recorded by only one recording system.In case of short interval more than four seconds,image combination and real-time recording were completed in less than one second.The efficiency of the recording system could be improved and system power consumption be reduced.