Image-dependent exposure enhancement

Details Image-dependent exposure enhancement Image-dependent exposure enhancement

1993-10-07

1995-05-09

Coles, Sr., Edward L.

Facsimile and static presentation processing

Natural color facsimile

Color correction

358520, H04N 146

Patent

active

054145384

ABSTRACT:
A method of altering the exposure in the reproduction of an electronically encoded natural scene image, including process steps of a) receiving an electronically encoded natural scene image, where the encoding is in terms of red-green-blue signals; b) converting the signals to a luminance-chrominance signal format, wherein at least one signal represents overall image intensity; c) comparing the intensity signal to a pair of preset threshold signals T.sub.light, T.sub.dark, respectively indicating satisfactory brightness and darkness of the image and producing a multi-state signal responsive to the comparison; d) if the signal state indicates that both thresholds are exceeded, or that neither threshold is exceeded, directing the electronically encoded image without alteration to further processing; e) if the signal state indicates that one of the pair of preset thresholds is exceeded, the original electronically encoded signal is processed in accordance with the equation:

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