A Fast and Light-Weight NonIterative Visual Odometry with RGB-D Cameras

In this paper, we introduce a novel approach for efficiently estimating the six-Degree-of-Freedom (DoF) robot pose with a decoupled, noniterative method that capitalizes on overlapping planar elements. Conventional RGB-D Visual Odometry (RGBD-VO) often relies on iterative optimization solvers to estimate pose and involves a process of feature extraction and matching. This results in significant computational burden and time delays. To address this, our innovative method for RGBD-VO separates the estimation of rotation and translation. Initially, we exploit the overlaid planar characteristics within the scene to calculate the rotation matrix. Following this, we utilize a Kernel Cross-Correlator (KCC) to ascertain the translation. By sidestepping the resource-intensive iterative optimization and feature extraction and alignment procedures, our methodology offers improved computational efficacy, achieving a performance of 71 Hz on a lower-end i5 CPU. When the RGBD-VO does not rely on feature points, our technique exhibits enhanced performance in low-texture degenerative environments compared to state-of-the-art methods.