Abstract

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.

© 2012 OSA

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References

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2011 (1)

2010 (1)

2009 (1)

2001 (1)

1980 (1)

1979 (1)

Anderson, R. H.

Bräuer, A.

Brückner, A.

Dannberg, P.

Druart, G.

Duparré, J.

Fendler, M.

Guérineau, N.

Haïdar, R.

Ichioka, Y.

Ishida, K.

Kawazu, M.

Kondou, N.

Kumagai, T.

Leitel, R.

Meyer, J.

Miyatake, S.

Miyazaki, D.

Morimoto, T.

Ogura, Y.

Primot, J.

Rommeluère, S.

Taboury, J.

Tanida, J.

Thétas, S.

Tünnermann, A.

Yamada, K.

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Figures (12)

Fig. 1
Fig. 1

Conceptual construction of our compound eye scanner.

Fig. 2
Fig. 2

Image combining process.

Fig. 3
Fig. 3

Extension of depth of field (DOF) by deblurring process.

Fig. 4
Fig. 4

Configuration of reflective optical elements in an optical unit from perspective view.

Fig. 5
Fig. 5

Picture of an optical unit. M2 and an aperture stop cannot be seen in this picture.

Fig. 6
Fig. 6

Alignment of optical units.

Fig. 7
Fig. 7

Projection view of optical elements in Y-Z plane.

Fig. 8
Fig. 8

MTF at 6 lp/mm versus defocal position in object space by simulation analysis.

Fig. 9
Fig. 9

Assembly of our compound eye optics. (a) The optical units are put into a frame with alternately inverted directions. (b) The optical units are arranged in the same way as Fig. 6.

Fig. 10
Fig. 10

Example of the image combining process. (a) Before the combining process. Each image is inverted. (b) After combining process.

Fig. 11
Fig. 11

Images of a resolution chart. Each image is combined from images of three optical units.

Fig. 12
Fig. 12

Contrast calculated from images at Δz = 7 mm in Fig. 11(b) and 11(c), before and after deblurring process.

Equations (3)

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ΔyΔz.
ν=n/50.8.
C(ν)= I max (ν) I min (ν) I max (ν)+ I min (ν) ,

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