红外焦平面阵列的盲元自适应快速校正

发布时间：2018-01-08 03:12

本文关键词：红外焦平面阵列的盲元自适应快速校正　出处：《光学精密工程》2017年04期 　论文类型：期刊论文

【摘要】：为实现红外焦平面阵列(IRFPA)盲元的自适应快速校正,本文设计了一种基于三梯度阈值检测的快速盲元校正方法。先通过优化L0范式的约束方程消除图中的非均匀条纹,排除干扰,再对水平、竖直和对角3个方向进行梯度阈值检测,找到盲元位置点,并与中值滤波结果进行点对点匹配,剔除误检测点,最后通过局部中值滤波完成盲元校正。依据盲元的缓变特性,通过合理更新盲元模板实现了单帧和序列图像的快速盲元校正。实验结果表明:相比于传统方法,本文方法的信噪比(SNR)和峰值信噪比(PSNR)提高了10~14dB,结构相似度指标(SSIM)提高了0.01~0.02,对图像中的随机和连续盲元的校正效果都很好,同时运算速度得到了大大提升,在保证图像质量指标的情况下速度提升了3~10倍,可以在到实际红外系统中实现动态检测和实时处理。
[Abstract]:In order to realize the fast and adaptive correction of IRFPA blind elements in infrared focal plane array (IRFPA). In this paper, a fast blind element correction method based on three-gradient threshold detection is designed. Firstly, the inhomogeneous fringe is eliminated by optimizing the constraint equation of L0 normal form, and then the interference is eliminated. Vertical and diagonal gradient threshold detection is carried out to find the blind element position points and point to point matching with the median filtering results to eliminate the false detection points. Finally, the local median filter is used to complete the blind element correction. According to the slow change characteristic of the blind element, the fast blind element correction of single frame and sequence image is realized by updating the blind element template. The experimental results show that the proposed method is more efficient than the traditional method. The signal-to-noise ratio (SNR) and peak signal-to-noise ratio (PSNR) of the proposed method are increased by 10 ~ 14dB, and the structural similarity index (SSIMM) is increased by 0.01g / 0.02. The correction effect of random and continuous blind elements in the image is very good, at the same time, the operation speed has been greatly improved, and the speed has been increased by 3 ~ 10 times under the condition of guaranteeing the image quality index. Dynamic detection and real-time processing can be realized in actual infrared system.
【作者单位】：浙江大学现代光学仪器国家重点实验室;
【基金】：国家自然科学基金资助项目(No.61475135)
【分类号】：TN21
【正文快照】： 作较繁琐,定标数据需要定期更新,系统免维护性1　引　言较差。由于辐射定标法存在固有缺陷,目前越来越　　红外焦平面阵列(IRFPA)是红外成像系统多的研究人员致力于研究基于场景的盲元检测方的核心部件,用于探测随温度变化的红外辐射能法。场景检测法直接从获取图像入手,通过

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