In order to overlap graphics and character on UAV reconnaissance image a image preprocessing system which is loosely coupled with control computer is designed. The DSP technique based system is controlled through RS232 serial port to receive overlapping information and to switch image filtering and enhancing algorithms. The interference between preprocessing system and the control computer is largely reduced by packaging the preprocessing system in a separate standard 1 U box. The system principle and design is described in detail. Test results show that the system meets all the feature and function requirements, the image filtering and enhancing function is effective and real- time. The design concept of this system can be used for reference for similar system design.%为了实现无人机侦察图像的图形字符叠加和预处理,设计了与系统主计算机松耦合的图像处理系统,系统基于DSP技术,通过串行接口控制叠加信息的内容和位置以及滤波增强算法切换,系统封装于独立外置的IU机箱中,有效减小了其与主控制计算机间的相互干扰.对系统组成原理和软硬件实现进行了详细介绍,实验结果表明,系统实现满足性能指标要求,滤波增强功能高效实时,其设计思想对同类型系统具有一定借鉴意义.
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