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首页> 外文会议>Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XVII >LCD display screen performance testing for handheld thermal imaging cameras
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LCD display screen performance testing for handheld thermal imaging cameras

机译：手持式热像仪的LCD显示屏性能测试

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Handheld thermal imaging cameras are an important tool for the first responder community. As their use becomes more prevalent, it will become important for a set of standard test metrics to be available to characterize the performance of these cameras. A major factor in the performance of the imagers is the quality of the image on a display screen. An imager may employ any type of display screen, but the results of this paper will focus on those using liquid crystal displays. First responders, especially firefighters, in the field rely on the performance of this screen to relay vital information during critical situations. Current research on thermal imaging camera performance metrics for first responder applications uses trained observer tests or camera composite output signal measurements. Trained observer tests are subjective and composite output tests do not evaluate the performance of the complete imaging system. It is the goal of this work to develop a nondestructive, objective method that tests the performance of the entire thermal imaging camera system, from the infrared sensor to the display screen. Application of existing display screen performance metrics to thermal imaging cameras requires additional consideration. Most display screen test metrics require a well defined electronic input, with either full black or white pixel input, often encompassing detailed spatial patterns and resolution. Well characterized thermal inputs must be used to obtain accurate, repeatable, and non-destructive display screen measurements for infrared cameras. For this work, a thermal target is used to correlate the measured camera output with the actual display luminance. A test method was developed to determine display screen luminance. A well characterized CCD camera and digital recording device were used to determine an electro-optical transfer function for thermal imaging cameras. This value directly relates the composite output signal to the luminance of the display screen, providing a realistic characterization of system performance.
机译：手持式热像仪是急救人员的重要工具。随着它们的使用变得越来越普遍，提供一组标准测试指标来表征这些相机的性能将变得很重要。成像仪性能的主要因素是显示屏上图像的质量。成像仪可以使用任何类型的显示屏，但本文的结果将重点放在使用液晶显示器的显示屏上。现场的急救人员，尤其是消防员，依靠此屏幕的性能在紧急情况下传递重要信息。当前针对急救人员应用的热像仪性能指标的研究使用训练有素的观察员测试或热像仪合成输出信号测量。受过训练的观察者测试是主观的，复合输出测试不会评估完整成像系统的性能。这项工作的目的是开发一种无损，客观的方法来测试从红外传感器到显示屏的整个热成像摄像机系统的性能。将现有显示屏性能指标应用于热成像相机需要额外考虑。大多数显示屏测试指标需要定义明确的电子输入，包括全黑或白像素输入，通常包含详细的空间图案和分辨率。必须使用特征明确的热输入来获得用于红外热像仪的准确，可重复且无损的显示屏测量结果。对于这项工作，使用热目标将测得的摄像机输出与实际显示亮度相关联。开发了一种确定显示屏亮度的测试方法。具有良好特征的CCD相机和数字记录设备用于确定热成像相机的电光传递函数。该值将复合输出信号与显示屏的亮度直接相关，从而提供了系统性能的真实表征。

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