Dana Kristin J, Wang Jing
Department of Electrical and Computer Engineering, Rutgers University, Piscataway, New Jersey 08854, USA.
J Opt Soc Am A Opt Image Sci Vis. 2004 Jan;21(1):1-12. doi: 10.1364/josaa.21.000001.
Capturing surface appearance is a challenging task because reflectance varies as a function of viewing and illumination direction. In addition, most real-world surfaces have a textured appearance, so reflectance also varies spatially. We present a texture camera that can conveniently capture spatially varying reflectance on a surface. Unlike other bidirectional imaging devices, the design eliminates the need for complex mechanical apparatus to move the light source and the camera over a hemisphere of possible directions. To facilitate fast and convenient measurement, the device uses a curved mirror so that multiple views of the same surface point are captured simultaneously. Simple planar motions of the imaging components also permit change of illumination direction and region imaging. We present the current prototype of this device, imaging results, and an analysis of the important imaging properties.
捕捉表面外观是一项具有挑战性的任务，因为反射率会随观察和光照方向而变化。此外，大多数现实世界的表面都有纹理外观，因此反射率在空间上也会变化。我们展示了一种纹理相机，它可以方便地捕捉表面上空间变化的反射率。与其他双向成像设备不同，该设计无需复杂的机械设备在可能的方向半球上移动光源和相机。为便于快速便捷地进行测量，该设备使用了一个曲面镜，以便同时捕捉同一表面点的多个视图。成像组件的简单平面运动也允许改变光照方向和成像区域。我们展示了该设备的当前原型、成像结果以及对重要成像特性的分析。
