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Objective evaluation of effective cathode diameter of low-light-level image intensifies

机译：低光级图像的有效阴极直径的客观评价加剧

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摘要

Effective cathode diameter (ECD) is an important index of low-light-level (LLL) image intensifier. The traditional evaluation method of this index is based on subjective observation. Professional testers observe the output image of image intensifier through microscope, and give the evaluation results according to the calibration target and their visual perception. The drawback is that the tester has to zoom the effective field of view and rotate the scale target to make evaluation, so the subjectivity is strong and the manpower is considerable. To address these problems, an objective evaluation method of ECD of LLL image intensifier is proposed, which realizes the digital measurement of the index. This method mainly composes of three parts: extracting effective anode edge (EAE), locating effective cathode center (ECC), and calculating ECD scale length. The anode output image of image intensifier is the target image. The specific implementations of this method comprise: first, extract EAE from the target image using the proposed edge extraction strategy. The square area containing the target central square (TCS) is the region of interest (ROI). Then, use the edge corner detection strategy based on neighborhood edge slope features to extract edge corners from ROI edge image. TCS corners are distinguished from other corners by their salient features, which are utilized to generate ECC. The pixel length of ECD is calculated by EAE and ECC. After that, compute the scale length of the circle diameter where the scale is located by using the proposed basic scale positioning strategy, and the conversion unit between pixels and millimeters is derived. Finally, deduce the scale length of ECD relying on the "pixel/mm" conversion unit and the pixel length of ECD. To verify the performance of this method, different types of image tubes are adopted for experiments. The results show that this method is robust to tube type, image brightness and effective anode field of view, and the calculated key parameters are in good agreement with the actual results. In addition, by comparing with the subjective evaluation method, the feasibility of this method is investigated. The results show that the objective evaluation results are consistent with the subjective judgment results, with a higher accuracy (0.001 mm). Moreover, the repeatability experimental results demonstrate that this method is more stable than the subjective evaluation method (the maximum deviation of evaluation results is 0.08 mm). In general, the presented objective evaluation method can be regarded as a reasonable alternative to the traditional ECD evaluation method for LLL image intensifier.
机译：有效的阴极直径（ECD）是低光级（LLL）图像增强器的重要指标。该指标的传统评价方法基于主观观察。专业测试仪通过显微镜观察图像增强器的输出图像，并根据校准目标及其视觉感知提供评估结果。缺点是测试仪必须缩放有效视野并旋转刻度目标以进行评估，因此主观性强，人力是相当大的。为了解决这些问题，提出了LLL图像增强器ECD的客观评估方法，实现了索引的数字测量。该方法主要由三个部分组成：提取有效阳极边缘（EAE），定位有效阴极中心（ECC），并计算ECD刻度长度。图像增强器的阳极输出图像是目标图像。该方法的具体实施方式包括：首先，使用所提出的边缘提取策略从目标图像中提取EAE。包含目标中央广场（TCS）的平方区域是感兴趣的区域（ROI）。然后，使用基于邻域边缘斜率特征的边角检测策略，从ROI边缘图像中提取边缘角。 TCS角落与其突出的特征与其他角区分开，其用于产生ECC。 ECD的像素长度由EAE和ECC计算。之后，计算通过使用所提出的基本尺度定位策略所定位的圆直径的圆形直径的比例长度，并且导出像素和毫米之间的转换单元。最后，推导了依赖于“像素/ mm”转换单元的ECD的比例长度和ECD的像素长度。为了验证该方法的性能，采用不同类型的图像管进行实验。结果表明，该方法对管型，图像亮度和有效阳极视野具有鲁棒性，并且计算出的密钥参数与实际结果很好。另外，通过与主观评价方法进行比较，研究了该方法的可行性。结果表明，客观评价结果与主观判断结果一致，精度更高（0.001毫米）。此外，重复性实验结果表明，该方法比主观评价方法更稳定（评价结果的最大偏差为0.08 mm）。通常，所提出的客观评估方法可以被视为用于LLL图像增强器的传统ECD评估方法的合理替代方法。

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  • 来源
    《Optical and quantum electronics》 |2021年第7期|375.1-375.23|共23页
  • 作者

    Luzi Wang; Yunsheng Qian; Shicong Zhu;

  • 作者单位

    School of Electronic and Optical Engineering Nanjing University of Science and Technology No.200 Xiaolingwei Xuanwu District Nanjing 210094 China;

    School of Electronic and Optical Engineering Nanjing University of Science and Technology No.200 Xiaolingwei Xuanwu District Nanjing 210094 China;

    North Night Vision Technology Co. Ltd Kunming 650114 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Low-light-level image intensifier; Cathode diameter; Edge extraction; Corner detection;

    机译：低光级图像增强器;阴极直径;边缘提取;角落检测;

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