A qualitative approach to quantitative recovery of SHGCs shape and pose from shading and contour

Author

Nakamura, Takayuki ; Asada, Minoru ; Shirai, Yoshiaki

Author_Institution

Dept. for Mech. Eng. for Comput.-Controlled Mach., Osaka Univ., Japan

fYear

1993

fDate

15-17 Jun 1993

Firstpage

116

Lastpage

122

Abstract

A qualitative approach to quantitatively recovering the shape and pose of a straight homogeneous generalized cylinder (SHGC) based on a weak Lambertian assumption is described. This assumption relaxes the strict cosine law of the Lambertian reflection model. The method does not need to know the lighting condition or surface albedo. The image of the projection of the axis of an SHGC is extracted. The slant angle of the SHGC is estimated using the weak Lambertian assumption along an extremal cross-section curve. The location of the SHGC´s 3-D axis on other parallels is located. As a result, the pose (slant and tilt) and the shape (the shape of the cross section, the location of the axis, and the sweeping function) of an SHGC are recovered. Experimental results for both synthesized and real images are shown

Keywords

computer vision; image reconstruction; parameter estimation; reflection; 3-D axis; Lambertian reflection model; extremal cross-section curve; pose recovery synthesized images; qualitative approach; quantitative recovery; real images; shape recovery; slant angle; straight homogeneous generalized cylinder; sweeping function; tilt; weak Lambertian assumption; Electronic mail; Geometrical optics; Layout; Machinery; Optical reflection; Psychology; Reflectivity; Sensor phenomena and characterization; Shape; Solid modeling;

fLanguage

English

Publisher

ieee

Conference_Titel

Computer Vision and Pattern Recognition, 1993. Proceedings CVPR '93., 1993 IEEE Computer Society Conference on

Conference_Location

New York, NY

ISSN

1063-6919

Print_ISBN

0-8186-3880-X

Type

conf

DOI

10.1109/CVPR.1993.340970

Filename

340970