DC Restoration of synchronously detected CCD imager output signa

Facsimile and static presentation processing – Facsimile – Recording apparatus

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358221, 358171, H04N 314

Patent

active

045624755

ABSTRACT:
A CCD imager is operated in cascade with a low-frequency-suppression filter and a synchronous detector, which synchronous detector uses as its switching carrier a harmonic of the clocking frequency of the CCD imager output register. The low-frequency-suppression filter has its zero-average-value output response referred to a noise-free reference level. At times between picture trace intervals, when d-c restoration is to be done, this reference level is caused to appear at the synchronous detector output instead of synchronously detected filter response. D-c restoration is made to this reference level and is thus made substantially more noise-free. The need to clock empty wells from the CCD imager for d-c restoration is avoided. This allows shortening the time the CCD imager output register is clocked during each line trace, allowing reduction in the power required for operating the imager and increasing available time for transfer from the image storage register to the output register.

REFERENCES:
patent: 3862361 (1975-01-01), George
patent: 4330753 (1982-03-01), Davy
patent: 4369466 (1983-01-01), Matsuzaki et al.
patent: 4496982 (1985-01-01), Levine

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