基于高动态范围成像的极端亮度测量方法研究

为了解决光污染中存在的极端亮度对比问题,针对此类复杂照明光环境,提出了一种基于高动态范围成像技术的极端亮度测量方法。利用24色标准色卡和CS-2000分光辐射亮度计对D5300数码相机进行标定,获得了高动态范围亮度分布图像与CIE 1931-XYZ表色系统刺激值之间的拟合关系,实现了极端亮度对比环境中亮度分布的准确测量。通过在城市道路中实地测量,验证了基于高动态范围成像技术的极端亮度测量方法的亮度测量动态范围可达10⁴,其测量值与CS-2000分光辐射亮度计测得的标准亮度值的相对误差分别为-2.2%和-2.5%,表明该方法具有良好的适用性,可为道路照明质量的高效、高准确度测量提供计量保障,为有效防治光污染等复杂光环境问题提供了解决方案。

Extreme luminance measurement method based on high dynamic range imaging

In order to solve the problem of extreme luminance contrast in light pollution, an extreme luminance measurement method based on high dynamic range imaging technology was proposed for complex lighting environment. The 24 color standard color card and CS-2000 spectrophotometer were used to calibrate D5300 digital camera, the fitting relationship between the luminance distribution image with high dynamic range and the stimulus value of CIE 1931-XYZ surface color system was obtained, and the accurate measurement of luminance distribution in extreme luminance contrast environment was realized. Through the field measurement in urban roads, it was verified that the dynamic range of luminance measurement of extreme luminance measurement method based on high dynamic range imaging technology could reach 104, and the relative errors between measured value and standard luminance value measured by CS-2000 spectrophotometer were ?2.2% and ?2.5% respectively. It shows that this method has good applicability, which can provide metrology support for efficient and high-accuracy measurement of road lighting quality, and also provide the solution for effective prevention and control of complex light environment problems such as light pollution.