Interactive dynamic range adjustment system for printing digital

Details Interactive dynamic range adjustment system for printing digital Interactive dynamic range adjustment system for printing digital

1989-01-05

1991-04-30

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 75, 358 76, G03F 308, H04N 146

Patent

active

050123335

ABSTRACT:
An interactive dynamic range adjustment method for printing digital images, and an implementation system, are disclosed. The method is based on experimental findings about visual photoreceptor adaption and human visual contrast sensitivity. The system adjusts the contrast of the low-frequency component only of the image, preserving (or if one wishes, enhancing) the high-frequency image component in its contrast. The adjustment is controlled by a mapping curve which the user manipulates interactively. The simulated optical print image and the dynamic range adjusted image are displayed side by side on a monitor screen so that the user can make proper selection of parameters to achieve the desired effect. For many images, the system automatically computes good parameters and no further adjustment is needed.

REFERENCES:
patent: 4467364 (1984-08-01), Konagaya
patent: 4812902 (1989-03-01), Fuchsberger
patent: 4812903 (1989-03-01), Wagensonner
patent: 4825297 (1989-04-01), Fuchsberger
patent: 4831434 (1989-05-01), Fuchsberger
patent: 4899216 (1990-02-01), Tatsumi
patent: 4933754 (1990-06-01), Reed et al.

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