摘要
近年来,DSP技术的发展不断将数字信号处理领域的理论研究成果应用到实际系统中,并且推动了新的理论和应用领域的发展,对图像处理等领域的技术发展也起到了十分重要的作用。随着红外热成像技术的不断发展和红外焦平面阵列(IRFPA)图像传感器的日益成熟,IRFPA被广泛应用于军事、工业和商业等领域的多种成像系统中。本文将红外热成像技术和DSP技术相结合,以本教研室所承接项目“非致冷红外焦平面热成像测温仪的研制”为背景,设计实现了一套基于TMS320DM642的视频图像实时处理模块。本文在分析红外热图像特征的基础上,结合实际应用的需要,对红外图像处理技术进行了深入的研究。利用高精度的黑体,对非致冷红外焦平面探测器模块进行了大量的温度标定实验,根据实验数据,提出了双分段标定的方法,建立了图像灰度与目标温度之间的数学模型,实现了温度的测量。在图像增强处理技术方面,提出了自适应灰度拉伸法,实现了对本系统感兴趣的温度偏高区域的增强。
通过分析各种多媒体实时开发平台的设计方式及高速电子系统的设计理论和原则,完成了视频图像实时处理模块的总体框架设计、元器件选型、原理图设计、PCB板图绘制、元器件的焊接等工作。并在PC机上进行了硬件仿真,完成了该模块的硬件调试和底层驱动程序的调试。
In recent years, the development of DSP technology has put the theory achievement of digital signal processing field into practical systems, and pushed the progress of new theory and application. At the same time, it plays an important role in the field of image processing. With the development of infrared imaging technology and infrared focal plane array (IRFPA) solid image detectors, IRFPA is widely used in various imaging system in the military, industrial and commercial fields. In this paper, I designed and implemented a module for the real-time processing of the image based on the TMS320DM642, with the linking of the infrared thermal imaging technology and the digital signal processing (DSP) technology. It comes from one of our lab’s projects, which is“the development of the instrument for the measuring of the temperature using the un-cooled infrared focal plane”.
In this paper, I researched the technology of the processing of the infrared image deeply, on the base of the character of the infrared image and the requirement of the application. I did many experiments to the temperature calibration of the un-cooled infrared focal plane detector, using the high accuracy blackbody and proposed the calibration approach of double segment, according to the experimental data. At the aspect of image enhancement technique, I proposed the adaptive gray-scale extension and enhanced the higher temperature region, which is important to this system.
Through analyzing the design methods of many multimedia real-time processing platforms and the design theory and principle of the high-speed electronic system, I completed some work, such as frame design, selecting electronic components, schematic diagram designing, protract PCB board, welding etc. I completed the debugging of the hardware and the bottom-level driver with PC.
引文
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