Method of calibrating an image for reducing shading

Details Method of calibrating an image for reducing shading Method of calibrating an image for reducing shading

1996-08-06

1998-03-31

Rogers, Scott

Facsimile and static presentation processing

Facsimile

Recording apparatus

358461, 358406, H04N 1401

Patent

active

057344795

ABSTRACT:
An image system for reducing shading noise of a scanned image is disclosed. The present invention includes following steps: a required deviation of shading noise of an image is specified initially. A real deviation of the shading noise is then generated by measuring the image system. Next, a sampling constant (n) is generated by dividing the real deviation of the shading noise squared by the required deviation of the shading noise squared. A line of a calibration plate is scanned n times, and the pixels of the scanned lines of the calibration plate are averaged. Finally, the image is conventionally calibrated using the averaged scanned line as a reference.

REFERENCES:
patent: 4821099 (1989-04-01), Sakamoto
patent: 5151796 (1992-09-01), Ito et al.

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