In this paper, we proposed a useful calculation method to perform the perception-based selection of lighting position that emphasizes the material appearance of CG object. The proposed method is based on the conventional viewpoint entropy which is used to find an appropriate viewing angle. To find an appropriate shot for material appearance, we first identified the important surface that has information of gloss reflection related to material appearance with eye tracking equipment. Next, we modified the equation of viewpoint entropy by adding a weight coefficient for emphasizing at important surface. Since this viewpoint entropy retains the independency for object shape, light direction, and viewing direction, our proposed method can extract only important light position which is most representative of the material appearance. From the results of verification with changing shape and material of CG object, we confirmed that our selection of lighting position accomplishes the fine agreement with subjective evaluation which is imposed on the selection of appropriate scene with emphasis of material appearance.

中文翻译：

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改进了视点熵，以评估各种照明位置下的材料外观

在本文中，我们提出了一种有用的计算方法来执行基于感知的照明位置选择，该选择强调了CG对象的材料外观。所提出的方法基于用于寻找合适视角的常规视点熵。为了找到适合材料外观的镜头，我们首先使用眼动仪确定了具有与材料外观相关的光泽反射信息的重要表面。接下来，我们通过添加用于在重要表面进行强调的权重系数来修改视点熵方程。由于此视点熵保留了对象形状，光方向和观察方向的独立性，因此我们提出的方法只能提取最能代表材质外观的重要光位置。