Apparatus and method for correcting offset and gain drift...

Details Apparatus and method for correcting offset and gain drift... Apparatus and method for correcting offset and gain drift...

H - Electricity

04

N

H04N 1/32 (2006.01) H04N 1/047 (2006.01) H04N 1/401 (2006.01) H04N 1/407 (2006.01)

Patent

CA 2125055

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 aecording 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 eommunication channels in a multi-channel system by using the same target values and same reference signals for each channel.

Affiliated with

Also associated with

Rating

Apparatus and method for correcting offset and gain drift... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus and method for correcting offset and gain drift..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for correcting offset and gain drift... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1349108