路面を読み解く：パワースペクトル密度による全地形ローバの地形推定
Mind the ground: A Power Spectral Density-based estimator for all-terrain rovers
ステレオカメラで計測した路面形状のパワースペクトル密度から、走行中に地形の凹凸を推定・分類する手法を提案し、全地形ローバで実地検証した。
著者: Giulio Reina, Antonio Leanza, Annalisa Milella, Arcangelo Messina
分類: eess.SY, cs.RO, cs.SY
原文アブストラクト
There is a growing interest in new sensing technologies and processing algorithms to increase the level of driving automation towards self-driving vehicles. The challenge for autonomy is especially difficult for the negotiation of uncharted scenarios, including natural terrain. This paper proposes a method for terrain unevenness estimation that is based on the power spectral density (PSD) of the surface profile as measured by exteroceptive sensing, that is, by using a common onboard range sensor such as a stereoscopic camera. Using these components, the proposed estimator can evaluate terrain on-line during normal operations. PSD-based analysis provides insight not only on the magnitude of irregularities, but also on how these irregularities are distributed at various wavelengths. A feature vector can be defined to classify roughness that is proved a powerful statistical tool for the characterization of a given terrain fingerprint showing a limited sensitivity to vehicle tilt rotations. First, the theoretical foundations behind the PSD-based estimator are presented. Then, the system is validated in the field using an all-terrain rover that operates on various natural surfaces. It is shown its potential for automatic ground harshness estimation and, in general, for the development of driving assistance systems.
