広角レンズ交通監視カメラの自動キャリブレーション
Autocamera Calibration for traffic surveillance cameras with wide angle lenses
数分の映像とカメラ高さのみを入力に、魚眼歪みを仮定した内部キャリブレーションと直交交差点での車両運動から消失点を推定する外部キャリブレーションを二段階で行い、可視・熱カメラ両方で有効性を示した。
著者: Aman Gajendra Jain, Nicolas Saunier
分類: cs.CV, cs.RO
原文アブストラクト
We propose a method for automatic calibration of a traffic surveillance camera with wide-angle lenses. Video footage of a few minutes is sufficient for the entire calibration process to take place. This method takes in the height of the camera from the ground plane as the only user input to overcome the scale ambiguity. The calibration is performed in two stages, 1. Intrinsic Calibration 2. Extrinsic Calibration. Intrinsic calibration is achieved by assuming an equidistant fisheye distortion and an ideal camera model. Extrinsic calibration is accomplished by estimating the two vanishing points, on the ground plane, from the motion of vehicles at perpendicular intersections. The first stage of intrinsic calibration is also valid for thermal cameras. Experiments have been conducted to demonstrate the effectiveness of this approach on visible as well as thermal cameras. Index Terms: fish-eye, calibration, thermal camera, intelligent transportation systems, vanishing points