Open AccessCompact image scanner with large depth of field by compound eye system
Author(s) -
Hiroyuki Kawano,
Tatsuki Okamoto,
Taku Matsuzawa,
Hirochika Nakajima,
Junko Makita,
Naoyuki Fujiyama,
Eiji Niikura,
Tatsuya Kunieda,
Tadashi Minobe
Publication year - 2012
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.013532
Subject(s) - optics , lens (geology) , image stitching , scanner , deblurring , magnification , exit pupil , physics , field of view , parallax , depth of field , optical path , position (finance) , image processing , computer science , computer vision , image (mathematics) , image restoration , pupil , finance , economics
A compact image scanner is designed by using a compound eye system with plural optical units in which a ray path is folded by reflective optics. The optical units are aligned in two lines and take each image of a separated field of view (FOV), slightly overlapped. Since the optical units are telecentric in the object space and the magnification ratio is constant regardless of the object distance, the separated pieces of a total image are easily combined with each other even in the defocused position. Since the optical axes between adjacent optical units are crossed obliquely, object distance is derived from the parallax at each boundary position and an adequate deblurring process is achieved for the defocused image.