Common light sources such as an ordinary flashlight with lenses and/or reflectors make complex 4-D light field that cannot be represented by conventional isotropic distribution model nor point light source model. This paper describes a new approach to estimate 4-D light field using an illuminated diffuser. Unlike conventional works that capture a 4-D light field directly, our method decomposes observed intensities on the diffuser into intensities of 4-D light rays based on inverse rendering technique with prior knowledge. We formulate 4-D light field reconstruction problem as a non-smooth convex optimization problem for mathematically finding the global minimum.

中文翻译：

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辐照度分解重建4-D光场

诸如带有透镜和/或反射器的普通手电筒之类的普通光源产生了复杂的4-D光场，而传统的各向同性分布模型和点光源模型都无法代表这种情况。本文介绍了一种使用照明扩散器估算4-D光场的新方法。与直接捕获4-D光场的传统作品不同，我们的方法基于具有先验知识的逆渲染技术，将漫反射器上观察到的强度分解为4-D光线的强度。我们将4-D光场重建问题公式化为非光滑凸优化问题，以数学方式找到全局最小值。