基于FPGA的实时红外图像采集与预处理系统

Design of Real-time Infrared Image Acquisition and Pre-process System Based on FPGA

设计了一套基于FPGA的实时红外图像采集与预处理系统。从系统总体设计入手,介绍了系统设计原理和硬件电路的各个组成部分。针对当今靶场设备图像处理在有效去除图像脉冲噪声的同时也会破坏图像细节等缺陷,结合FPGA在并行结构和流水线操作方面的优势,提出了一种基于十字窗口的快速中值滤波算法在FPGA中实时实现的方法。该方法替换了靶场光学设备的高层次算法,节约了宝贵的处理时间。这种系统采用了模块化结构设计、流水线工作方式以及乒乓存储等多项技术。实验结果表明,该方法具有较强的噪声抑制能力,可提高整个系统的实时性,因而具有很高的实用价值。

A FPGA-based real-time infrared image acquisition and pre-processing system is designed. Beginning from the overall design, the design principle of the system and each component of the hardware circuitry are presented. Since the image processing system in the current target range equipment may destroy the detail in an image while it reduces the impulse noise in the same image effectively, a cross- window-based method for implementing fast median filter algorithm in FPGA in real time is proposed in combination with the advantages of FPGA in the aspects of parallel structure and pipelining. The high-level algorithm in a target range is replaced with this method and much precious processing time is saved. In this system, several technologies such as modular design, assembly line and ping-pong operation are used. The experimental result shows that the method has a better noise suppression ability and can improve the instantaneity of the entire system. So, it is of great value in practical applications.