Photometric calibration of zoom lens systems

Author

Asada, Naoki ; Amano, Akira ; Baba, Masashi

Author_Institution

Dept. of Intelligent Syst., Hiroshima City Univ., Japan

Volume

1

fYear

1996

fDate

25-29 Aug 1996

Firstpage

186

Abstract

This paper describes a calibration method of zoom lens systems to eliminate the photometric distortion due to vignetting. A novel camera model including the variable cone is proposed to account for the marginal intensity reduction observed in images. Using the theoretical model, we first show that the serious distortion due to vignetting appears when using a zoom lens that has open aperture and long focal length. Then we present the calibration method to estimate the intensity reduction from the lens parameters of zoom and iris. The experimental results demonstrate the validity of our theoretical model and the effectiveness of the photometric calibration of zoom lens systems

Keywords

CCD image sensors; calibration; computer vision; lenses; optical noise; photometry; CCD video camera; marginal intensity reduction; photometric calibration; photometric distortion; variable cone; vignetting; zoom lens systems; Calibration; Cameras; Computer vision; Image analysis; Layout; Lenses; Optical distortion; Performance analysis; Photometry; Spatial resolution;

fLanguage

English

Publisher

ieee

Conference_Titel

Pattern Recognition, 1996., Proceedings of the 13th International Conference on

Conference_Location

Vienna

ISSN

1051-4651

Print_ISBN

0-8186-7282-X

Type

conf

DOI

10.1109/ICPR.1996.546016

Filename

546016