Three dimensional measurement of objects in liquid and estimation of refractive index of liquid by using images of water surface with a stereo vision system

Author

Yamashita, Atsushi ; Fujii, Akira ; Kaneko, Toru

Author_Institution

Dept. of Mech. Eng., Shizuoka Univ., Shizuoka

fYear

2008

fDate

19-23 May 2008

Firstpage

974

Lastpage

979

Abstract

In this paper, we propose a new three-dimensional (3-D) measurement method of objects in unknown liquid with a stereo vision system. When applying vision sensors to measuring objects in liquid, light refraction is an important problem. Therefore, we estimate refractive indices of unknown liquids by using images of water surface, restore images that are free from refractive effects of the light, and measure 3-D shapes of objects in liquids in consideration of refractive effects. The effectiveness of the proposed method is shown through experiments.

Keywords

computer vision; refractive index; stereo image processing; light refraction; liquid refractive index; stereo vision system; three dimensional measurement; three-dimensional measurement method; vision sensors; water surface images; Cameras; Distortion measurement; Image restoration; Optical attenuators; Optical refraction; Refractive index; Sea measurements; Shape measurement; Stereo vision; Working environment noise;

fLanguage

English

Publisher

ieee

Conference_Titel

Robotics and Automation, 2008. ICRA 2008. IEEE International Conference on

Conference_Location

Pasadena, CA

ISSN

1050-4729

Print_ISBN

978-1-4244-1646-2

Electronic_ISBN

1050-4729

Type

conf

DOI

10.1109/ROBOT.2008.4543331

Filename

4543331