Look-up table based gamma and inverse gamma correction for high-

Details Look-up table based gamma and inverse gamma correction for high- Look-up table based gamma and inverse gamma correction for high-

1991-07-22

1993-03-23

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358461, 358164, H04N 5202

Patent

active

051969246

ABSTRACT:
An image display system includes an input to a source (10, 12, 14) of image pixel data wherein each pixel is expressed as an M-bit value within a non-linear range of values. A first LUT (16) is coupled to an output of the source for converting each M-bit pixel value to an N-bit value within a linear range of values. An image memory, or frame buffer (18), has an input coupled to an output of the first LUT for storing the N-bit pixel values. The system further includes a second LUT (20) coupled to an output of the frame buffer for converting N-bit pixel values output by the frame buffer to P-bit pixel values within a non-linear range of values. The converted values are subsequently applied to a display (24). In an exemplary embodiment, the first LUT stores gamma corrected pixel values and the second LUT stores inverse gamma corrected pixel values. Preferably the second LUT stores a plurality of sets of inverse gamma corrected pixel values. Also, the frame buffer stores, for each of the N-bit pixel values, a value that specifies a particular one of the plurality of sets of inverse gamma corrected pixel values for use in converting an associated one of the N-bit pixel values.

REFERENCES:
patent: 4217574 (1980-08-01), Anderson
patent: 4317114 (1982-02-01), Walker
patent: 4394688 (1983-07-01), Iida et al.
patent: 4438495 (1984-03-01), Collins et al.
patent: 4534059 (1985-08-01), Yamada
patent: 4568978 (1986-02-01), Cosh
patent: 4599611 (1986-07-01), Bowker et al.
patent: 4688095 (1987-08-01), Beg et al.
patent: 4727434 (1988-02-01), Kawamura
patent: 4786968 (1988-11-01), Kutner
patent: 4800442 (1989-01-01), Riseman et al.
patent: 4805013 (1989-02-01), Dei et al.
patent: 4931864 (1990-06-01), Kawamura et al.
patent: 4999702 (1991-03-01), Knierim et al.
patent: 5012163 (1991-04-01), Alcorn et al.
patent: 5047861 (1991-09-01), Houchin et al.
patent: 5081524 (1992-01-01), Tsuruoka et al.
patent: 5089890 (1992-02-01), Takayama
patent: 5103298 (1992-04-01), Kashimura et al.

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