光学

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1 Range Image Sensors Using Active Stereo Methods Kazunori UMEDA and Kenji TERABAYASHI Active stereo methods, which include the traditional light-section method and the talked-about Kinect sensor, are typical and important range imaging methods. In this paper, the outline of the active stereo methods is introduced, and then our high-speed compact range image sensor is described that uses a multi-spot laser projector. It consists of a commercially available laser projector and a high-speed CCD camera. Although the acquired range image is sparse, the sensor is thought to be adequate for several applications such as robot vision because of its 200 Hz high-speed imaging, compactness, and robustness to disturbance light. A sensing system that combines the range image sensor and a color CCD camera is also introduced. A range image with a color texture can be acquired at 200 Hz with the system. Threedimensional mapping result is shown as an example of the sensor application. Key words: active stereo, range image sensor, multi-spot laser projector, triangulation, robot vision 3D Shirai 4 Microsoft Kinect ab 1 a 2 TOF time-of-flight method MHz b 2 shape from focus/defocus a b a b umeda@mech.chuo-u.ac.jp

2 1 2 a b a b NRC Synchronized Laser Scanner R, G, B CCD CCD / n 2 n 7 8 / khz CCD Kinect 5 13

3 a b 3 a b Hz 200 Hz PC 2. 1 CCD 2 k z α b f z, α k p b f p CCD a 4 CCD 3 b a mm 3 StockerYale Coherent Mini-519X 785 nm 35 mw CCD 200 fps Point Grey Research Dragonfly Express CCD 7.4 mm 8 mm 720 nm Hoya R72 Edmund Optics 785 nm 5 b CCD 47.5 mm 3 b arctan 1/

4 a a 7 7 pixel mm 733 mm b 5a CCD b 6 b 7 ab 2000 mm 800 mm 12.6 mm 2000 mm 31.5 mm mm a mm mm CCD CCD 12 10

5 5 CCD CCD Dragonfly Express 200 fps CCD mm 60 mm 100 mm 800 mm Hz 200 Hz CCD Hz 200 Hz CCD 15 Kinect lx 1 P. Besl: Active, optical range imaging sensors, Mach. Vision Appl., F. Blais: Review of 20 years of range sensor development, J. Electron. Imaging, Y. Shirai: Recognition of polyhedrons with a range finder, Pattern Recognit., Kinect No M. Rioux: Laser range finder based on synchronized scanners, Appl. Opt., Cubicscope Robomec 99 2P D J69-D Y. Watanabe, T. Komuro and M. Ishikawa: 955-fps real-time shape measurement of a moving/deforming object using high-speed vision for numerous-point analysis, Proc. of 2007 IEEE International Conference on Robotics and Automation Roma, 2007 pp Hz C Hz

6 チャ付き距離画像計測システムの構築と三次元マッピングへ の応用 日本ロボット学会誌 佐川立昌 川崎 洋 古川 亮 清田祥太 平行線投影を 用いた連続領域の検出による高密度なワンショット形状復 元 画 像 の 認 識 理 解 シ ン ポ ジ ウ ム MIRU2011 OS 吉澤 徹 最新光三次元計測 朝倉書店 T. Kuroki, K. Terabayashi and K. Umeda: Construction of a compact range image sensor using multi-slit laser projector and obstacle detection of a humanoid with the sensor, Proc IEEE/RSJ International Conference on Intelligent Robots and Systems Taipei, 2010 pp 年 12 月 21 日受理 a 図 11 図 10 に対して計測されたテクスチャー付 き距離画像 b 図 8 距離画像計測例 a 対象物体に投影されたス ポット光像 b 得られた距離画像 鳥瞰図 a b 図 12 複数のテクスチャー付き距離画像を用いた 三次元マッピング例 a 対象シーン b 構築さ れたカラーテクスチャー付き三次元マップ 図 10 カラー CCD カメラを加えたシステム による物体計測の様子 光 学

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