投影空間におけるピクセルレベル可視光通信を用いた3D姿勢推定
3D Pose Estimation in Projection Space via Pixel-level Visible Light Communication
投影画像の各ピクセルに不可視コードを埋め込むPVLCとPnP問題を組み合わせ、外部センサなしで空中ロボットなどの3D姿勢をリアルタイム推定する手法を実現した。
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著者: Michikuni Eguchi, Takefumi Hiraki
分類: cs.RO
原文アブストラクト
Projector-based augmented reality enables natural interaction between users and devices by overlaying digital information onto the physical world through projected imagery. A key technical requirement of such systems is accurate positional alignment between the projector and the devices. Pixel-level Visible Light Communication (PVLC) achieves this alignment without external sensing infrastructure by embedding invisible spatial codes into each projected pixel through high-speed brightness modulation that preserves image quality. However, the information that PVLC transmits is inherently planar. PVLC has therefore been limited to devices moving on a flat surface and cannot estimate the 3D pose of devices in three-dimensional space, such as aerial robots. To extend PVLC-based pose estimation to three dimensions, we formulate it as a Perspective-n-Point (PnP) problem. The 2D pixel positions that four coplanar photosensors on the device receive via PVLC serve as the image points, and their known 3D layout provides the object points. Experiments show that the proposed system estimates 3D pose with a latency of approximately 8~ms and a 3D position RMSE of 19.2~mm after Kalman filtering. These results confirm the first realization of real-time 3D pose estimation coordinated with high-quality projected image content without external sensing infrastructure.