Perspective photometric methods for non-Lambertian surfaces

镜面高光为光泽或镜面的空间感知提供了重要信息。在最近的计算机视觉的光度学方法中，将不同的照明方向与这种线性透视图一起使用，然而，到目前为止，这只与最简单的漫反射表面反射模型一起考虑。镜面反射通常被认为是离群点，尽管镜面反射可以提供三维形状的重要信息，而且漫反射对于许多材料来说也是复杂的，但是到目前为止高级反射模型还没有被应用到光度立体中。特别是，在这些新模型的形状计算中应考虑镜面反射高光和其他非朗伯效应。与其他现代的光度立体方法相比，应采用一种更灵活的建模方法，以便能够估计模型参数，这对实际应用非常重要。

Specular highlights bear significant information for the spatial perception of glossy or mirror-like surfaces. Together with the shading of objects and the linear perspective such illumination effects are for instance used in paintings in order to give a threedimensional impression of depicted scenes.In recent photometric methods in computer vision, different illumination directions are used together with such linear perspective views, however, up to now this has only been considered together with the simplest model of diffuse surface reflectance. Specular reflections have often been considered asoutliers, although exactly such effects can provide important information of threedimensional shape.Moreover, also diffuse reflectance is known to be of complex nature for many materials, but advanced reflectance models have not been employed in photometric stereo up to now.The aim of this DFG-project is to provide new models for perspective photometric 3-D reconstruction. In particular specular highlights and other non-Lambertian effects shall be considered for shape computation in these new models. In contrast to other modern methods for photometric stereo a more flexible modelling approach shall be employed that allows for the estimation of model parameters which is highly important for practical applications.