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References

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  1. R. Barakat, A. Houston, J. Opt. Soc. Am. 54, 768 (1964).
    [CrossRef]
  2. F. Kottler, F. H. Perrin, J. Opt. Soc. Am. 56, 377 (1966).
    [CrossRef]

1966 (1)

1964 (1)

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Figures (3)

Fig. 1
Fig. 1

Object irradiance distribution function for a general two-bar object: (a) bright bars in a dark background; (b) dark bars in a bright background.

Fig. 2
Fig. 2

Image modulation as a function of α for a general two-bar target in dark background (—) and in light background (- - -) for Mo = 1.0 and 0.5.

Fig. 3
Fig. 3

Limiting resolvable frequency ωr as a function of α for a general two-bar target with light background (- - -) and with dark background (—) for Mo′ = 1.0 and 0.5.

Equations (6)

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M o = ( O max - O min ) / ( O max + O min ) .
O ( z ) = a - b + 2 b O ( z ) ,
I ( z ) = a - b + 2 b I ( z ) ,
M i = M i M o Λ ( M o ) .
Λ ( M o ) = 2 I ¯ / [ 1 - M o ( 1 - 2 I ¯ ) ] ,
I ¯ = ( I max + I min ) / 2

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