High Dynamic Range Photogrammetry for Light and Geometry Measurement
High Dynamic Range Photogrammetry for Light and Geometry Measurement
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用于光和几何测量的高动态范围摄影测量
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
H. Cai
中科院分区：
文献类型：
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作者：
H. Cai
当人们感知世界时，他们的眼睛同时获取光线和几何形状以构成一个图像，该图像在大脑中被解读为视觉。在许多与视觉感知相关的科学和工业应用中，需要对光线（在光度学中）和几何形状进行实时同步测量。传统上，人们使用仪表和工具来测量光线和几何形状。数码相机也能够测量光线或几何形状，例如最近经过验证的用于对静态场景进行亮度映射的高动态范围（HDR）摄影，以及用于测量几何形状的量测相机辅助摄影测量法。不幸的是，现有技术无法同时测量光线和几何形状。分开测量增加了工作量，减缓了数据收集速度，并给后续的数据对齐带来困难。为了突破这些限制，最近开发了HDR摄影测量法，用于同步获取场景中目标的亮度及其在现场的三维坐标XYZ。HDR摄影测量法使用一台配备标准镜头、广角镜头或鱼眼镜头的普通消费级数码相机，并将其安装在一个便携式测量平台上。HDR摄影测量法在实验室实验中得到了验证。对七个灰色棋盘格进行亮度映射的平均误差为1.8% - 6.2%，测量其XYZ坐标的平均误差为12.9 - 24.3毫米，在实际应用中被认为是可以接受的。HDR摄影测量法将补充光线和几何形状的测量，并激发许多应用。本文介绍了HDR摄影测量法的一些室内和室外应用，使用一台配备10毫米适马EX DC HSM鱼眼镜头的佳能EOS Rebel T2i作为主要测试设备，用于同时测量光线和几何形状。
When people perceive the world, their eyes simultaneously acquire light and geometry to constitute an image that is interpreted in the brain as vision. The real-time synchronous measurement of light (in photometry) and geometry is desired in many scientific and industrial applications related to visual perception. Conventionally, meters and tools have been used for measuring light and geometry. Digital cameras can also measure light or geometry, such as recently validated high dynamic range (HDR) photography for luminance mapping a static scenario, and metric-camera-aided photogrammetry for measuring geometry. Unfortunately, existing technologies cannot measure light and geometry simultaneously. The separated measurements increase the labor, slow the data collection, and cause difficulties in follow-up data alignment. To break through these limitations, HDR photogrammetry was recently developed for synchronous acquisition of luminance of targets across a scene and their three dimensional coordinates XYZ in the field. The HDR photogrammetry deploys a single consumer grade digital camera fitted with a standard, wide-angle, or fisheye lens, mounted on a portable measurement platform. The HDR photogrammetry was validated in a laboratory experiment. The average errors of 1.8% – 6.2% for luminance mapping seven grey checkers and 12.9 – 24.3 mm for measuring their XYZ coordinates are deemed acceptable in practice. The HDR photogrammetry would supplement light and geometry measurement and stimulate many applications. This paper introduces several indoor and outdoor applications of the HDR photogrammetry, using a Canon EOS Rebel T2i fitted with a 10 mm Sigma EX DC HSM fisheye lens as the main test rig, for measuring light and geometry simultaneously.