object contrast

object contrast

[′äb·jekt ′kän‚trast]
(optics)
The ratio of the difference between the brightness of an object and of the background to the brightness of the background in an image or reproduction.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
ODM also determines the contrast of the object against the sky background, presenting this as the "Log Object Contrast," or LOC.
Log Object Contrast: +0.15 Log Threshold Contrast: -0.08 Log Contrast Difference: +0.23 ODM: 55X While for the urban setting,
Log Object Contrast: -1.45 Log Threshold Contrast: -0.82 Log Contrast Difference: -0.63 ODM: Not detectable Not surprisingly, ODM predicts the galaxy will not be visible in the urban environment.
Dark skies rules
The ratio of image contrast to object contrast at various angular scales is called the telescope's modulation transfer function, as explained in this department by William Zmek (S&T: July 1993, page 91, and September 1993, page 83).
Telescopic performance on the planets
Evaluating a telescope's contrast performance is just a matter of plotting the ratio of image contrast to object contrast for details in a whole range of angular sizes.
* Image contrast is always less than object contrast, even for a perfect telescope.
Rules of thumb for planetary scopes, part 1
Ensuring an object contrasts well with its background will guarantee it has visual impact.
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