1. 1) Masaru Ohta, "An Obstacle Detection System for Level Crossings using Stereo Camera," RTRI Report, Vol.17, No.6, pp.11-16, 2003 (in Japanese).
2. 2) Masaru Ohta, Norifumi Shibayama, Keiji Hanawa, "Obstacle Detection System for Level Crossings Using Stereo Cameras," WCRR2003, 2003.
3. 3) Masaru Ohta, "Obstacle Detection System for Level Crossings Using Stereo Cameras," 8th International Level Crossing Symposium, 2004.
4. 4) Bernd Jahne, Horst Haubecker, COMPUTER VISION AND APPLICATIONS. ACADEMIC PRESS, 2000.
5. 5) John C. Russ, The IMAGE PROCESSING Handbook. CRC PRESS, 1999.