Interference-Free Epipole-Centered Structured Light Pattern for Mirror-Based Multi-view Active Stereo

Tomu Tahara, Ryo Kawahara, Shohei Nobuhara, Takashi Matsuyama

Abstract: This paper is aimed at proposing a new structured light pattern for mirror-based multi-view active stereo so that the patterns cast onto the object surface do not interfere even where the object is illuminated by the projector directly and indirectly via mirror. The key idea of our interference-free projection is to encode the projector pixel locations so that they do not collide with the code from other projector pixels by exploiting the epipolar geometry defined by the real and the virtual projectors. We prove that our new encoding does not generate code collisions between the direct and indirect patterns from the real and the virtual projectors respectively. Evaluations using real and synthesized datasets demonstrate that our approach can realize an interference-free projection without using specialized equipment such as orthographic projectors used in the state-of-the-art methods.