This paper proposes the first self-supervised 6D object pose prediction from multimodal RGB+polarimetric images. The novel training paradigm comprises 1) a physical model to extract geometric information of polarized light, 2) a teacher-student knowledge distillation scheme and 3) a self-supervised loss formulation through differentiable rendering and an invertible physical constraint. Both networks leverage the physical properties of polarized light to learn robust geometric representations by encoding shape priors and polarization characteristics derived from our physical model. Geometric pseudo-labels from the teacher support the student network without the need for annotated real data. Dense appearance and geometric information of objects are obtained through a differentiable renderer with the predicted pose for self-supervised direct coupling. The student network additionally features our proposed invertible formulation of the physical shape priors that enables end-to-end self-supervised training through physical constraints of derived polarization characteristics compared against polarimetric input images. We specifically focus on photometrically challenging objects with texture-less or reflective surfaces and transparent materials for which the most prominent performance gain is reported.

本研究提出了第一个自监督的多模态RGB+偏振图像的6D目标姿态预测方法，通过物理模型、师生知识蒸馏和逆可逆的物理约束等方式实现了稳健的几何表征和对偏振光的特征编码。通过自监督训练和物理约束，得到了准确的物体外观和几何信息，特别适用于具有挑战性纹理、反光表面和透明材料的物体。

S2P3：自监督极化姿态预测