Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1992-01-06
1994-01-25
Kostak, Victor R.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 32, H04N 969
Patent
active
052820360
ABSTRACT:
A gamma correction circuit in which digitized video intensity values are divided into high and low intensity ranges. Every fourth high value is gamma corrected in a lookup table and written to a frame buffer. All of the low intensity values are written to the buffer without gamma correction. The data in the buffer is mapped by a second lookup table before being converted to an analog signal. The second table maps the low intensity values to gamma corrected values and does not change the value of the high intensity values. When data is read from the frame buffer for further processing before display on a CRT, the lower intensity values need not be inverse gamma corrected. The high intensity values are inverse gamma corrected via a lookup table before such further processing.
REFERENCES:
patent: 5008741 (1991-04-01), Knierim et al.
patent: 5012163 (1991-04-01), Alcorn et al.
patent: 5175621 (1992-12-01), Maesato
Nelis Hendrik W.
Worley, Jr. William S.
Hewlett--Packard Company
Kostak Victor R.
Murrell Jeffery S.
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