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Journal of Biomedical Optics

Three-dimensional measurement endoscope system with virtual rulers
Author(s): Hiromasa Nakatani; Keiichi Abe; Atsuo Miyakawa; Susumu Terakawa
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Paper Abstract

Conventional endoscopic images do not provide quantitative 3-D information. We present an endoscope system that can measure the size and position of an object in real time. Our endoscope contains four laser beam sources and a camera. The procedural steps for 3-D measurements are as follows. First, to obtain the function that maps 2-D coordinates of an image point to its 3-D coordinates in 3-D space, we observe a standard chart with the endoscope lens and determine the correspondence between the image and object height. In addition to the mapping, this function can correct barrel-shaped distortion of endoscopic images. The system detects laser spots on an object surface automatically using a template matching method, and maps the 2-D coordinates of the laser spots to the 3-D coordinates by the triangulation method. Then the system calculates the magnification ratio on the object plane, which is perpendicular to the optical axis and passes the laser spot, so that the system can superimpose a ruler whose scale fits the 3-D coordinates of the object. Thus, physicians can measure the size and position of objects in real time on undistorted images similar to placing rulers on the surface of an organ.

Paper Details

Date Published: 1 September 2007
PDF: 6 pages
J. Biomed. Opt. 12(5) 051803 doi: 10.1117/1.2800758
Published in: Journal of Biomedical Optics Volume 12, Issue 5
Show Author Affiliations
Hiromasa Nakatani, Shizuoka Univ. (Japan)
Keiichi Abe, Aichi Institute of Technology (Japan)
Atsuo Miyakawa, Shizuoka Univ. (Japan)
Susumu Terakawa, Hamamatsu Univ. School of Medicine (Japan)

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