Circuit for producing brightness signal from output signal of so

Details Circuit for producing brightness signal from output signal of so Circuit for producing brightness signal from output signal of so

1991-09-06

1993-02-02

Britton, Howard W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 50, H04N 909

Patent

active

051842122

ABSTRACT:
A circuit for producing a brightness signal from output color signals of a solid state image pick-up apparatus. The circuit comprises a delay circuit for delaying an output signal generated by one solid state image sensor by a delay time corresponding to one-half of a spatial sampling period so that the phase of the output signal of the one solid state image sensor is made to coincide with the phase of an output signal of another solid state image sensor. A first filter is provided for cutting off higher frequency components contained in the output signal of the delay circuit and in the output signal of the other solid state image sensor, and a signal processor is provided for processing output signals of the first filter. A first matrix adds output signals of the signal processor to each other at a predetermined ratio to produce a first brightness signal, and a second matrix adds the output signal of the delay circuit and the output signal of the other solid state image sensor to each other at a ratio of 1:1 to derive a second brightness signal. A second filter extracts a high frequency component from the second brightness signal, and an adder adds the high frequency component derived by the second filtering means to the first brightness signal.

REFERENCES:
patent: 4358788 (1982-11-01), Burrowes
patent: 4490738 (1984-12-01), Asaida
patent: 4506294 (1985-03-01), Nagumo
patent: 4725881 (1988-02-01), Buchwald
"Wide Dynamic Range HDTV Image Sensor With Aliasing Suppression" Nishida et al., IEEE Transactions on Consumer Electronics, vol. 34, No. 3, Aug. 1988, pp. 506-511.

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