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利用模拟电路对热成象系统图象信号进行实时处理,具有简便易行、成本低、处理速度快等优点。本文简要分析了已有的两种模拟处理方法。提出了一种新的处理方法(RHPF方法),它的基本原理是根据红外景物视频信号的特点,将表征大块景物的大幅度低频信号进行压缩,而将表征图象细节成分的小幅度高频信号进行提升。视频信号经过RHPF处理电路被分为两部分。低频信号通过低频通道进行压缩,另一通道将原始视频信号进行适当的放大。在输入到显示器之前,将两者相减后合并。从而很好地完成了压缩低频、提高高频的作用。此种方法设置参数容易,调节方便,带有很大的灵活性,可满足不同景物进行补偿的需要。与其它模拟方法相比,还具有电路简单、成本低、便于集成化等优点。通过实验证明了这是一种改善红外图象象质的行之有效的处理方法。
The use of analog circuits for thermal imaging system for real-time image signal processing, with simple, low cost, fast processing speed and so on. This article briefly analyzes the two existing analog processing methods. A new processing method (RHPF method) is proposed. Its basic principle is to compress large low-frequency signals that characterize large blocks according to the characteristics of infrared scene video signals, Frequency signal to enhance. The video signal is divided into two parts through the RHPF processing circuit. The low-frequency signal is compressed through the low-frequency channel, and the other channel amplifies the original video signal appropriately. Subtract the two before combining them into the display. So well done to compress the low frequency, improve the role of high-frequency. This method is easy to set parameters, easy to adjust, with great flexibility to meet the needs of different objects to compensate. Compared with other simulation methods, but also has a simple circuit, low cost, easy integration and so on. Experiments show that this is an effective way to improve the image quality of infrared images.