Television – Camera – system and detail – Camera connected to computer
Patent
1993-07-01
1996-05-21
Greening, Wendy R.
Television
Camera, system and detail
Camera connected to computer
348257, 348294, 348691, 358504, 382321, H04N 5225, H04N 146, G06K 710
Patent
active
055194419
ABSTRACT:
The present invention is directed to a system and method for compensating for offset and gain drift in a fast scan direction during an image forming process. To achieve compensation, the present invention samples a plurality of permanently darkened pixels upon powering up image sensors and circuitry therefor and during a sub-scanning process of an image and feeds this information into an offset value generating circuit. The offset generating circuit continually adjusts a pixel offset voltage according to a difference between sequential samples of the permanently darkened pixel, thereby compensating for fast scan offset drift. The present invention also samples a plurality of active pixels during a scanning of a calibration strip. From this scan, a gain corrective value is calculated. The present invention then samples active pixels during a scanning of a platen background. In response to this sampling, the gain corrective value is continually adjusted according to a difference between sequential samples of the platen background, thereby compensating for fast scan gain drift. The present invention can also compensate and balance transfer functions for a plurality of communication channels in a multi-channel system by using the same target values and same reference signals for each channel.
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Gusmano Donald J.
Hayes, III Frederick O.
Lovette Whynn V.
Rossi Robert J.
Greening Wendy R.
Nickerson Michael J.
Shalwala Bipin
Xerox Corporation
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