Luminance balanced encoder

Details Luminance balanced encoder Luminance balanced encoder

1990-12-14

1992-12-08

Oberley, Alvin E.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340800, 340728, 358 21R, 358 80, G09G 116, H04N 146

Patent

active

051701529

ABSTRACT:
A color encoder for reducing visible artifacts even when the values of the respective color signals are truncated during encoding. Since the human eye is most sensitive to luminance variations in the displayed image, luminance errors (and hence visible artifacts) are minimized by adding red and green color error signals to the blue color intensity signal prior to encoding so that luminance detail may be maintained. The blue channel is chosen for this purpose since the human eye is least sensitive to changes in blue and yellow. The color maps for the resulting encoded signals may be scaled such that the red and green values are raised and/or the blue values lowered so as to maintain the same relative intensity of luminance in the displayed image. Errors in the displayed luminance signal may thus be made up to four times smaller without increasing the amount of memory required and without adding expensive processing circuitry.

REFERENCES:
patent: 4686520 (1987-08-01), Yamaoka
patent: 4719503 (1988-01-01), Craver et al.
patent: 4725828 (1988-02-01), Cowlishaw
patent: 4733230 (1988-03-01), Kurihara et al.
patent: 4789854 (1988-12-01), Ishii
patent: 4847683 (1989-07-01), Lang
patent: 4866514 (1989-09-01), Yeomans
patent: 4956638 (1990-09-01), Larky et al.
patent: 5012163 (1991-04-01), Alcorn et al.

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