【作者】 周慧鑫；

【导师】 刘上乾；

【作者基本信息】 西安电子科技大学 ， 物理电子学， 2002， 硕士

【摘要】 目前，红外焦平面阵列(IRFPA)是一种兼具辐射敏感和信号处理功能的技术性能最先进的红外探测器，它代表着红外探测器的发展方向。但是焦平面探测器固有的非均匀性问题是其应用中必须解决的关键问题之一。本文在深入探讨了红外焦平面阵列非均匀性产生机理及其特性的基础上，深入研究和分析了目前已有的两类非均匀性校正算法，综合比较了多种校正算法的优缺点。根据实际需要，提出了一种自适应滤波分段线性插值的非均匀性校正算法，它是两点校正算法的扩展，不仅具有较大的动态范围，而且可以消除由于探测器响应特性温漂现象对非均匀性校正的影响。通过理论分析和仿真实践证明，这种方法在工程上是可行而有效的。本文对疵点自动查找和补偿算法也进行了研究。此外，本文还针对高帧频的128×128面阵红外焦平面器件，设计了一套焦平面信号实时处理技术的硬件系统实现方案。该系统是基于ADSP21062 DSP芯片构成的高速数字信号处理系统，具有大容量、高速并行的数据处理能力，它既有串行的工作方式，又有并行处理的操作过程。可以实时完成焦平面信号的数据采集、数据重排、非均匀性校正、图像增强、疵点自动查找和补偿以及视频合成显示等一系列功能。更多还原

【Abstract】 At present, the Infrared Focal Plane Arrays (IRFPA) is represented the tendency of infrared detector, but the staring IR imaging system performance is crucial limited by the inherent nonuniformity of IRFPA. So the key problem needed to be solved in the IRFPA applications is applicable and real time nonuniformity correction technology. Based on a thorough and deep question of the generating mechanism and characteristic of the nonuniformity of IRFPA, this paper investigates and studies the kinds of existing nonuniformity correction algorithms, makes a comparison among these algorithms on advantage and disadvantage. According to the practical need, the paper put forward a new nonuniformity correction algorithm-adaptive linear subsection interpolation correction algorithm, which is the expansion of two-point correction algorithm. The approach is not only achieved the nonuniformity correction in large dynamic range, but also eliminated the effect of temperature excursion of detector responsibility on nonuniformity correction. Theoretical analysis and practice in computer’s simulation has verified this approach’s practicability and effectiveness. The approach of invalided detector cell (including blind cell and penetrating cell) automatic searching and compensation is also studied in this paper. To high frame rate 128X 128 focal plane device, a scheme of the hardware implementation system of real-time signal processing for FPA is also presented in this paper. The system has streamline hierarchy and parallel processing structure based on DSP(ADSP21062), having powerful data processing capacity. It can implement FPA data sample, data rearrange, nonuniformity correction, image enhancement, defect pixel automatic searching and compensation, video signal synthesizing and displaying, etc.更多还原