Measuring Light Field of Light Source with High Directional Resolution Using Mirrored Ball and Pinhole Camera
Measuring Light Field of Light Source with High Directional Resolution Using Mirrored Ball and Pinhole Camera
复制标题
使用镜球和针孔相机以高方向分辨率测量光源光场
DOI：
10.1007/s10043-006-0314-0
复制
发表时间：
2006
期刊：
影响因子：
1.2
通讯作者：
Y. Miyake
中科院分区：
文献类型：
--
作者：
K. Takase;N. Tsumura;T. Nakaguchi;Y. Miyake
本文提出了一种使用镜球和针孔相机以高方向分辨率测量光源光场的方法。光场描述了光源辐射的空间和方向分布。方向分布通过镜球上的反射而扩展，并且辐射率由带有针孔透镜的电荷耦合器件（CCD）相机测量。通过机械臂横向移动光源来测量定向扩展的光场，CCD上的每个像素都可以通过高方向分辨率的针孔透镜获得光源的辐射亮度。使用光线追踪技术根据像素值和每个像素的位置来估计光场。通过所提出的方法对氪灯的光场进行了实验测量，并根据光谱辐射计在采样点测量的辐照度来评估测量的准确性。
This paper presents a method of measuring a light field of a light source with high directional resolution using a mirrored ball and a pinhole camera. The light field describes a spatial and directional distribution of radiances from the light source. The directional distribution is expanded by a reflection on the mirrored ball, and the radiances are measured by a charge-coupled device (CCD) camera with a pinhole lens. The light source is laterally moved by a robot arm to measure the directionally expanded light field, and each pixel on a CCD can obtain the radiances from the light source through the pinhole lens with high directional resolution. The light field is estimated from the pixel value and the position of each pixel using a ray tracing technique. The light field of a krypton lamp was experimentally measured by the proposed method, and the accuracy of the measurement was evaluated against the irradiances measured by a spectro-radiometer at sample points.