Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1994-08-24
2000-03-14
Rogers, Scott
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358483, H04N 1028, H04N 119, H04N 140
Patent
active
060380381
ABSTRACT:
The present invention is a method of compensating for the offset present in image signals produced by an image processing apparatus, and more particularly to accurately characterizing the offset, gain and higher order responses of image sensing elements to enable correction thereof in an image sensing device or scanner. The method utilizes intermediate (grey) reflectance targets to measure the response of each sensor element and then, using the measured responses, fits a characteristic curve to the responses to calculate the response of the sensor element, including a zero reflectance situation, to characterize an accurate offset level, gain, and higher order response for the sensor. Moreover, additional reflectance targets and response may be employed so as to enable the characterization of image sensing elements exhibiting non-linear responses to linearly increasing light intensities.
REFERENCES:
patent: 3586772 (1971-06-01), Hardin
patent: 3673322 (1972-06-01), Baxter
patent: 3800078 (1974-03-01), Cochran et al.
patent: 3800079 (1974-03-01), McNeil et al.
patent: 3952144 (1976-04-01), Kolker
patent: 4216503 (1980-08-01), Wiggins
patent: 4555732 (1985-11-01), Tuhro
patent: 4660082 (1987-04-01), Tomohisa et al.
patent: 4734762 (1988-03-01), Aoki et al.
patent: 4989100 (1991-01-01), Ishima
patent: 5267053 (1993-11-01), Potucek et al.
patent: 5282024 (1994-01-01), Takei
patent: 5283632 (1994-02-01), Suzuki
P. Swart, "Contrast Amplifier," IBM Technical Disclosure Bulletin, vol. 14, No. 3, Aug. 1971, pp. 883-884.
I. Qureshi, "Automatic Gain Correction (AGC) Video Correction," Xerox Disclosure Journal, vol. 18, No. 1, Jan./Feb. 1993 (pp. 75-76).
Beikirch Thomas R.
Selby Bart D.
Rogers Scott
Xerox Corporation
LandOfFree
Method for determining offset and gain correction for a light se does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for determining offset and gain correction for a light se, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for determining offset and gain correction for a light se will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-174969