Gamma correction and white balance adjustment method and apparat

Details Gamma correction and white balance adjustment method and apparat Gamma correction and white balance adjustment method and apparat

1992-11-03

1994-05-24

Groody, James J.

Television

Image signal processing circuitry specific to television

Color balance or temperature

348658, 348675, 348745, 348761, 348181, H04N 973, H04N 931, H04N 574, H04N 566

Patent

active

053153782

ABSTRACT:
A gamma correction and white balance adjustment device has a calculator for calculating brightness target values expected to produce on a screen in response to calculated input signals to be applied to a CRT. The calculated input signals are actually applied to the CRT and the actual brightness values observed on the screen are measured. A table of a list of the calculated input signals expected to produce the brightness target values and a corresponding list of measured input signals which actually produced the calculated brightness target values is formed. An amplitude conversion circuit is provided for converting the amplitude of the input signal, which is equal to the calculated input signal, to that of the measured input signal in accordance with the obtained table.

REFERENCES:
patent: 4706108 (1987-11-01), Kumagi et al.
patent: 4751566 (1988-06-01), Pilot
patent: 4804887 (1989-02-01), Miyama et al.
patent: 4868668 (1989-09-01), Tauernetti
patent: 5181103 (1993-01-01), Aoyama
patent: 5216504 (1993-06-01), Webb et al.
patent: 5257096 (1993-10-01), Oshima

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