High accuracy blemish compensator for defective pixels of a CCD

Details High accuracy blemish compensator for defective pixels of a CCD High accuracy blemish compensator for defective pixels of a CCD

1991-08-30

1992-10-27

Razavi, Michael

Facsimile and static presentation processing

Facsimile

Recording apparatus

35821316, 35821311, 35821315, H04N 5335

Patent

active

051594579

ABSTRACT:
In an adjustment operational mode, a charge coupled device (CCD) having pixels with a blemish, that is, a defect which is temperature dependent, is driven so that the CCD accumulates N times as much charge as in an ordinary operational mode. A corresponding offset voltage is supplied to a temperature sensor so that a blemish compensation signal from a blemish compensation signal generator can be adjusted with high accuracy. In the adjustment mode, the temperature of the CCD is raised, so that the level of the blemish component of the signal output from the CCD is large enough to be accurately adjusted. In an ordinary operational mode, the compensation signal from the blemish compensation signal generator which has been level-adjusted with high accuracy in the adjustment operational mode is added to an image pick-up output signal of the CCD to produce a blemish compensated signal adjusted with high accuracy.

REFERENCES:
patent: 4237488 (1980-12-01), Takehura
patent: 4494145 (1985-01-01), Kokufukata et al.
patent: 4558366 (1985-12-01), Nagelho
patent: 4639775 (1987-01-01), Cohen et al.
patent: 4703442 (1987-10-01), Levine
patent: 4760453 (1988-07-01), Hieda
patent: 4922337 (1990-05-01), Hunt et al.

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