Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1989-07-12
1991-07-16
Kostak, Victor R.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358903, H04N 718
Patent
active
050329065
ABSTRACT:
A scene projector is calibrated by providing a look-up table for intensity adjustment values of each pixel of the displayed frame. The look-up table is formed by calculating a ratio of measured intensity of each pixel to the intensity of the pixel of minimum intensity when power and scene modulation controls are at maximum. Power modulator control response and scene modulator control response curves are generated, and a black body calibration is performed to define the relation between black body temperature, power modulator and scene modulator settings. Power modulator control settings are determined for each of a number of selected black body temperatures, and a scene modulator setting is determined that is required to obtain a proper black body temperature. These values are stored in a second table and combined with intensity value corrections from the intensity value table to modify image data.
REFERENCES:
patent: 4754329 (1988-06-01), Lindsay et al.
"Broad-Band Guided-Wave Electrooptic Modulators", Becker, IEEE Journal Quantum Electronics, vol. QE-20, #7, Jul. 1984.
"Linear Interferometric Modulators In Ti:LiNbO.sub.3 ", Journal of Lightwave Technology, vol. LT-2, #4, Aug. 1984.
Aura Systems, Inc.
Kostak Victor R.
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