naa a22 4500 510807356 CHVBK 20180411083424.0 cr unu---uuuuu 180411e20130501xx s 000 0 eng 10.1007/s11548-012-0794-2 doi (NATIONALLICENCE)springer-10.1007/s11548-012-0794-2 3-D shape measurement endoscope using a single-lens system [Elektronische Daten] [Takaaki Takeshita, Minkyu Kim, Yoshikazu Nakajima] Purpose A three-dimensional (3-D) shape measurement endoscopic technique is proposed to provide depth information, which is lacking in current endoscopes, in addition to the conventional surface texture information. The integration of surface texture and 3-D shapes offers effective analytical data and can be used to detect unusual tissues. We constructed a prototype endoscope to validate our method. Methods A 3-D measurement endoscope using shape from focus is proposed in this paper. It employs a focusing part to measure both texture and 3-D shapes of objects. Image focusing is achieved with a single-lens system. Results A prototype was made in consideration of proper endoscope sizes. We validated the method by experimenting on artificial objects and a biological object with the prototype. First, the accuracy was evaluated using artificial objects. The RMS errors were 0.87mm for a plate and 0.64mm for a cylinder. Next, inner wall of pig stomach was measured in vitro to evaluate the feasibility of the proposed method. Conclusion The proposed method was efficient for 3-D measurement with endoscopes in the experiments and is suitable for downsizing because it is a single-lens system. CARS, 2012 Endoscope nationallicence 3-D measurement nationallicence Shape from focus nationallicence Depth from focus nationallicence 3-D measurement endoscope nationallicence Takeshita Takaaki School of Engineering, The University of Tokyo, Intelligent Modeling Laboratory Room # 602, Yayoi 2-11-16, Bunkyo, 113-8656, Tokyo, Japan aut Kim Minkyu School of Engineering, The University of Tokyo, Intelligent Modeling Laboratory Room # 602, Yayoi 2-11-16, Bunkyo, 113-8656, Tokyo, Japan aut Nakajima Yoshikazu School of Engineering, The University of Tokyo, Intelligent Modeling Laboratory Room # 602, Yayoi 2-11-16, Bunkyo, 113-8656, Tokyo, Japan aut International Journal of Computer Assisted Radiology and Surgery Springer-Verlag 8/3(2013-05-01), 451-459 1861-6410 8:3<451 2013 8 11548 https://doi.org/10.1007/s11548-012-0794-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11548-012-0794-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Takeshita Takaaki School of Engineering, The University of Tokyo, Intelligent Modeling Laboratory Room # 602, Yayoi 2-11-16, Bunkyo, 113-8656, Tokyo, Japan aut NATIONALLICENCE 700 1- Kim Minkyu School of Engineering, The University of Tokyo, Intelligent Modeling Laboratory Room # 602, Yayoi 2-11-16, Bunkyo, 113-8656, Tokyo, Japan aut NATIONALLICENCE 700 1- Nakajima Yoshikazu School of Engineering, The University of Tokyo, Intelligent Modeling Laboratory Room # 602, Yayoi 2-11-16, Bunkyo, 113-8656, Tokyo, Japan aut NATIONALLICENCE 773 0- International Journal of Computer Assisted Radiology and Surgery Springer-Verlag 8/3(2013-05-01), 451-459 1861-6410 8:3<451 2013 8 11548 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer