NightHawk:低照度環境における能動照明制御
Active Illumination Control in Low-Light Environments using NightHawk
暗所で特徴が乏しい環境向けに、照明強度と露光時間をベイズ最適化でオンライン調整し、特徴検出・マッチングを改善する枠組みを提案。
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著者: Yash Turkar, Youngjin Kim, Karthik Dantu
分類: cs.RO, cs.CV
原文アブストラクト
Subterranean environments such as culverts present significant challenges to robot vision due to dim lighting and lack of distinctive features. Although onboard illumination can help, it introduces issues such as specular reflections, overexposure, and increased power consumption. We propose NightHawk, a framework that combines active illumination with exposure control to optimize image quality in these settings. NightHawk formulates an online Bayesian optimization problem to determine the best light intensity and exposure-time for a given scene. We propose a novel feature detector-based metric to quantify image utility and use it as the cost function for the optimizer. We built NightHawk as an event-triggered recursive optimization pipeline and deployed it on a legged robot navigating a culvert beneath the Erie Canal. Results from field experiments demonstrate improvements in feature detection and matching by 47-197% enabling more reliable visual estimation in challenging lighting conditions.
