Luminance signal forming circuit

Details Luminance signal forming circuit Luminance signal forming circuit

1987-12-16

1989-05-23

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 39, 358 44, H04N 969, H04N 907

Patent

active

048335274

ABSTRACT:
In a luminance signal forming circuit, output signals from a color television camera having complementary color filters are subjected to a matrix operation to provide a first luminance signal of good luminance reproducibility, but having a relatively low signal-to-noise (S/N) ratio, and the output signals from the camera are further simply mixed to form a second or pseudo luminance signal of relatively poor signal fidelity but having a relatively high S/N ratio. The first and second luminance signals are subjected to first and second gamma corrections, respectively, which provide a first gamma characteristic having an inclination less than that for the usual or normal gamma value, while the second gamma correction provides a characteristic having an inclination substantially smaller than that of the first gamma characteristic. The gamma corrected luminance signals are selectively included in an output luminance signal so that when an average level of the first and second luminance signals is high, at least a relatively large proportion of the output luminance signal is constituted by the first luminance signal with the first gamma characteristic and, when the average level is low, at least a relatively large proportion of the output luminance signal is constituted by the second luminance signal having the second gamma characteristic.

REFERENCES:
patent: 3752905 (1973-08-01), Schneider
patent: 4697208 (1987-09-01), Eino

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