Abstract

There are many applications that use multiple charge-coupled device (CCD) cameras. Accordingly it is important to ensure alignment between the CCDs. However, a simple and quantitative alignment procedure has not been introduced thus far. For this reason, this paper proposes an alignment procedure that uses a matched filter algorithm. By using the proposed procedure, the six alignment errors which are x, y, z, roll, pitch, and yaw between the two CCDs can be eliminated. Moreover, the procedure can be applied to the alignment of more than two CCDs. It is believed that the proposed alignment procedure is helpful for precise experiments in many applications that use multiple CCDs.

© 2009 OSA

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References

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  1. G. C. Righini, A. Tajani, and A. Cutolo, An introduction to optoelectronic sensors, (World Scientific Publishing Company, 2009).
  2. G. C. Holst, and T. S. Lomheim, “CMOS/CCD sensors and camera systems,” (SPIE-International Society for Optical Engine, 2007).
  3. M. Akiba, K. P. Chan, and N. Tanno, “Full-field optical coherence tomography by two-dimensional heterodyne detection with a pair of CCD cameras,” Opt. Lett. 28(10), 816–818 (2003).
    [CrossRef] [PubMed]
  4. D. Kim, and B. J. Baek, “On-Axis Single Shot Digital Holography Using Polarization Based Two Sensing Channels,” in Digital Holography and Three-Dimensional Imaging, OSA Technical Digest (CD) (Optical Society of America, 2008), paper DTuC1.
  5. W. Ko, Y. Kwak, and S. Kim, “Measurement of Optical Coefficients of Tissue-like Solutions using a Combination Method of Infinite and Semi-infinite Geometries with Continuous Near Infrared Light,” Jpn. J. Appl. Phys. 45(No. 9A), 7158–7162 (2006).
    [CrossRef]
  6. J.-W. You, D. Kim, S. Y. Ryu, and S. Kim, “Simultaneous measurement method of total and self-interference for the volumetric thickness-profilometer,” Opt. Express 17(3), 1352–1360 (2009).
    [CrossRef] [PubMed]
  7. J. W. Goodman, Introduction to Fourier Optics, (Roberts & Company, 2004).

2009 (1)

2006 (1)

W. Ko, Y. Kwak, and S. Kim, “Measurement of Optical Coefficients of Tissue-like Solutions using a Combination Method of Infinite and Semi-infinite Geometries with Continuous Near Infrared Light,” Jpn. J. Appl. Phys. 45(No. 9A), 7158–7162 (2006).
[CrossRef]

2003 (1)

Akiba, M.

Chan, K. P.

Kim, D.

Kim, S.

J.-W. You, D. Kim, S. Y. Ryu, and S. Kim, “Simultaneous measurement method of total and self-interference for the volumetric thickness-profilometer,” Opt. Express 17(3), 1352–1360 (2009).
[CrossRef] [PubMed]

W. Ko, Y. Kwak, and S. Kim, “Measurement of Optical Coefficients of Tissue-like Solutions using a Combination Method of Infinite and Semi-infinite Geometries with Continuous Near Infrared Light,” Jpn. J. Appl. Phys. 45(No. 9A), 7158–7162 (2006).
[CrossRef]

Ko, W.

W. Ko, Y. Kwak, and S. Kim, “Measurement of Optical Coefficients of Tissue-like Solutions using a Combination Method of Infinite and Semi-infinite Geometries with Continuous Near Infrared Light,” Jpn. J. Appl. Phys. 45(No. 9A), 7158–7162 (2006).
[CrossRef]

Kwak, Y.

W. Ko, Y. Kwak, and S. Kim, “Measurement of Optical Coefficients of Tissue-like Solutions using a Combination Method of Infinite and Semi-infinite Geometries with Continuous Near Infrared Light,” Jpn. J. Appl. Phys. 45(No. 9A), 7158–7162 (2006).
[CrossRef]

Ryu, S. Y.

Tanno, N.

You, J.-W.

Jpn. J. Appl. Phys. (1)

W. Ko, Y. Kwak, and S. Kim, “Measurement of Optical Coefficients of Tissue-like Solutions using a Combination Method of Infinite and Semi-infinite Geometries with Continuous Near Infrared Light,” Jpn. J. Appl. Phys. 45(No. 9A), 7158–7162 (2006).
[CrossRef]

Opt. Express (1)

Opt. Lett. (1)

Other (4)

D. Kim, and B. J. Baek, “On-Axis Single Shot Digital Holography Using Polarization Based Two Sensing Channels,” in Digital Holography and Three-Dimensional Imaging, OSA Technical Digest (CD) (Optical Society of America, 2008), paper DTuC1.

G. C. Righini, A. Tajani, and A. Cutolo, An introduction to optoelectronic sensors, (World Scientific Publishing Company, 2009).

G. C. Holst, and T. S. Lomheim, “CMOS/CCD sensors and camera systems,” (SPIE-International Society for Optical Engine, 2007).

J. W. Goodman, Introduction to Fourier Optics, (Roberts & Company, 2004).

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Figures (7)

Fig. 1
Fig. 1

(a) Matched filter algorithm based on the 4-f optical system (f: focal length of lenses L1 and L2, (b) Simplified description of the matched filter algorithm represented by the Fourier Transform (FT).

Fig. 2
Fig. 2

Power distribution in the output plane: (a) when the input is exactly a(x, y) and (b) when the input is deviated from the signal a(x, y).

Fig. 3
Fig. 3

Schematic diagram of the experiment setup.

Fig. 4
Fig. 4

Six geometric variables which needed to be aligned in the proposed matched filter based scheme.

Fig. 5
Fig. 5

Input images captured in the two CCDs: (a) Object intensity at CCD1. (b) Object intensity at CCD2. (c) Object intensity at CCD1 with nine regions. (d) Object intensity at CCD2 with nine regions.

Fig. 6
Fig. 6

Experimental results of the matched filtering procedures: (a) Ideally aligned, (b) Not aligned, and (c) Practically aligned.

Fig. 7
Fig. 7

(a) Concentrated regions. (b) Spread regions. (c) Roll error. (d) Pitch error.

Tables (1)

Tables Icon

Table 1 Peak and RMS values of the experimental results described in Fig. 6.

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