Proposal of calibration method for 3-D digestive endoscope using grid active stereo

Hirooki Aoki, Ryo Furukawa, Ishin Nishitani, Masahito Aoyama, Shinsaku Hiura, Yoko Kominami, Taiji Matsuo, Shigeto Yoshida, Shinji Tanaka, Ryusuke Sagawa, Hiroshi Kawasaki

Research output: Contribution to journalArticlepeer-review


Calibration for calculating the external parameter of camera-projector system is important, to make high-precision 3-D measurement by 3-D endoscope using the grid active stereo. In this paper, we propose a new calibration method with a sphere calibration object in a geometrically flexible camera-projector system, and we examine the validity of the proposed method. As the result of comparing using conventional calibration with a plane calibration object, it is clarified that the proposed method resolves the scaling imprecision, that is a problem of the conventional method. Thus, the proposed method has higher potential of measurement accuracy. In addition, it is the advantage of the proposed method that precision estimation of calibration parameters with a low number of input images is possible.

Original languageEnglish
Pages (from-to)97-107
Number of pages11
JournalTransactions of Japanese Society for Medical and Biological Engineering
Issue number2
Publication statusPublished - 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biomedical Engineering


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