High-fidelity image reproduction using angular distribution of reflected spectral intensity
High-fidelity image reproduction using angular distribution of reflected spectral intensity
复制标题
使用反射光谱强度的角度分布进行高保真图像再现
DOI：
10.1117/12.410783
复制
发表时间：
2000
期刊：
影响因子：
1.2
通讯作者：
N. Ohyama
中科院分区：
文献类型：
--
作者：
M. Tsuchida;T. Obi;Masahiro Yamaguchi;N. Ohyama
提出了一种在各种观察条件下再现物体图像的方法。在该方法中，通过在光谱功率分布和位置已知的点光源下旋转物体来捕获一系列多光谱图像。基于二色反射和朗伯模型，将捕获的图像分解为漫反射和镜面反射分量图像。接着，基于观察几何学计算照明光的入射角以及观察方向与规则反射之间的角度。最后，利用光线重排技术合成观测几何条件下的图像。使用二维物体，皮革和织物进行实验。大多数的合成图像被示出为与在假设的照明几何形状下实际捕获的图像相同，即使对象具有复杂的反射，如织物，其难以应用在计算机图形学中使用的反射模型。
A method to reproduce images of an object under various observation conditions is presented. In this method, a series of multispectral images is captured by rotating the object under a point light source of which spectral power distribution and the position are known. The captured images are decomposed into diffuse and specular reflection component images based on the dichromatic reflection and the Lambertian models. Next, the incident angle of the illumination light and the angle between viewing direction and regular reflection are calculated based on observation geometry. Finally, the image under observation geometry is synthesized using the light-ray rearrangement technique. The experiments are carried out using two-dimensional objects, leather and fabric. Most of the synthesized images are shown to be the same as the images actually captured under the assumed illumination geometry, even if the object has complex reflection like fabric for which it is difficult to apply the reflection model used in computer graphics.