Circuit for processing image signals read out of pick-up apparat

Details Circuit for processing image signals read out of pick-up apparat Circuit for processing image signals read out of pick-up apparat

1991-08-13

1993-07-20

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 50, 35821327, 358483, H04N 909

Patent

active

052298485

ABSTRACT:
A circuit for processing red, green and blue color signals read out of red, green and blue solid state image sensing devices, light receiving elements of the green solid state image sensing device are spatially shifted with respect to those of the red and blue solid state image sensing devices in a horizontal scanning direction by a half of a pitch of the arrangement of the light receiving elements, including red, green and blue channels, each having a correlation double sampling circuit, in which a color signal is sampled at feed-through and signal portions, thereof to derive two sample values and a difference between these sample values is derived as an output color signal. When the green color signal is sampled and held in the green channel, the sampling operation in the red and blue channels is inhibited by neutralizing sample values in these channels, and when the red and blue color signals are sampled and held in the red and blue channels, respectively, the sampling operation in the green channel is inhibited by neutralizing sample values. The frequency response of a brightness signal obtained by mixing the thus processed red, green and blue color signals does not become zero even if an object to be picked-up has a spatial frequency which is equal to the sampling frequency.

REFERENCES:
patent: 4106056 (1978-08-01), Nagumo
patent: 4220977 (1980-09-01), Yamanaka
patent: 4281339 (1981-07-01), Morishita
patent: 4599640 (1986-07-01), Dischert
patent: 4989100 (1991-01-01), Ishima

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