[OPTICAL REVIEW Vol. 2, No. 3 (1995) 194-198]

Shape Measurement from Endoscopic Images: Determination of Dimensional Scale Factor by a Photometric Method

Norihiko ODA,1 Jun HASEGAWA,2 Tetsuo NONAMI,2 Masahiro YAMAGUCHI1 and Nagaaki OHYAMA1

1Imaging Science and Engineering Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226 Japan, 2Olympus Optical Co., Ltd., 2951 Ishikawacho, Hachioji, Tokyo, 192 Japan

(Received December 28, 1994; Accepted March 6, 1995)

We propose a new method to measure surface topography using a monocular endoscope. The surface structure is obtained up to a scale factor from an image sequence taken through a conventional CCD endoscope. The scale factor is determined by a photometric method, and the actual size of the object can be determined. The principle and experimental results are presented.

Key words : endoscope, surface structure, shape measurement, photometric method, monocular image, image sequence