High resolution gamma correction method and apparatus for pixel

Details High resolution gamma correction method and apparatus for pixel High resolution gamma correction method and apparatus for pixel

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

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