Polarization is well known for its ability to decompose diffuse and specular reflections. However, the existing decomposition methods only focus on direct reflection and overlook multiple reflections, especially specular inter-reflection. In this paper, we propose a novel decomposition method for handling specular inter-reflection of metal objects by using a unique polarimetric feature: the rotation direction of linear polarization. This rotation direction serves as a discriminative factor between direct and inter-reflection on specular surfaces. To decompose the reflectance components, we actively rotate the linear polarization of incident light and analyze the rotation direction of the reflected light. We evaluate our method using both synthetic and real data, demonstrating its effectiveness in decomposing specular inter-reflections of metal objects. Furthermore, we demonstrate that our method can be combined with other decomposition methods for a detailed analysis of light transport. As a practical application, we show its effectiveness in improving the accuracy of 3D measurement against strong specular inter-reflection.

使用方向线性偏振旋转作为区分直接反射和镜面间接反射的特征，本论文提出了一种应对金属物体镜面间接反射的新型分解方法，通过主动旋转入射光的线性偏振并分析反射光的旋转方向，对反射率组分进行分解，实验证明了该方法在分解金属物体镜面间接反射方面的有效性，并展示了该方法与其他分解方法相结合进行光输运详细分析的能力，对强镜面间接反射下的3D测量精度提升方面也取得了良好效果。

偏振光传输分析与镜面互反射