Abstract

We describe a new optical system consisting of an active-matrix liquid-crystal television (AMLCTV) and a position-sensitive device (PSD) that tracks a moving object in television image in real time. The AMLCTV transforms the television signal into a two-dimensional optical image, and the PSD detects the center of the image projected onto the target without scanning. The advantage of this system is its ability to track accurately an object moving at a high speed.

© 1989 Optical Society of America

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References

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  1. H.-K. Liu, J. A. Davis, R. A. Lilly, Opt. Lett. 10, 635 (1985).
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    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
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1987 (3)

1986 (2)

1985 (1)

1983 (1)

Y. Terada, K. Yamamoto, Jpn. J. Opt. 12, 367 (1983).

1952 (1)

E. R. Kretzmer, Bell Syst. Tech. J. 31, 751 (1952).

Davis, J. A.

Gregory, D. A.

Huang, X. L.

Hughes, K. D.

Jutamulia, S.

Kabrisky, M.

Kretzmer, E. R.

E. R. Kretzmer, Bell Syst. Tech. J. 31, 751 (1952).

Lilly, R. A.

Liu, H.-K.

Lu, X. J.

Mills, J. P.

Rogers, S. K.

Song, Q. W.

Terada, Y.

Y. Terada, K. Yamamoto, Jpn. J. Opt. 12, 367 (1983).

Yamamoto, K.

Y. Terada, K. Yamamoto, Jpn. J. Opt. 12, 367 (1983).

Yu, F. T. S.

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Figures (4)

Fig. 1
Fig. 1

Principle of the optical system, (a) The basic setup of the system, (b) TV images in successive frames, (c) Images of the frame-difference signal between frames No. 1 and No. 2 and frames No. 2 and No. 3, corresponding to the outline image of a moving object.

Fig. 2
Fig. 2

Experimental setup for the real-time detection of the center coordinates of an object moving in a TV image. P, Polarizer; A, analyzer; PC, personal computer. The ABS produces the absolute value of the frame-difference signal between the current frame and the previous frame.

Fig. 3
Fig. 3

Experimental results for the tracking of a personal-computer-generated moving white mark with an area of 1% of the AMLCTV screen. The solid curve is the experimental curve, and the dotted curve is the calculated curve.

Fig. 4
Fig. 4

Experimental result of the tracking of the moving pendulum of a metronome filmed by a TV camera, (a) The image filmed by a TV camera, (b) The image of the absolute value of the frame-difference signal between the current frame and the previous frame, (c) The trace of the center of the moving pendulum superimposed upon the image.

Equations (4)

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X m = ( I o X o + I b X b ) / ( I o + I b ) ,
Y m = ( I o Y o + I b Y b ) / ( I o + I b ) ,
X o = X m + I b ( X m X b ) / ( I m I b ) ,
Y o = Y m + I b ( Y m Y b ) / ( I m I b ) .

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