Positioning skew compensation for imaging system using photocond

Details Positioning skew compensation for imaging system using photocond Positioning skew compensation for imaging system using photocond

1994-08-10

1995-12-26

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

25055937, H01J 4014

Patent

active

054790069

ABSTRACT:
A system for compensating for positioning errors in the scanning and digital readout of latent electrostatic images on a photoconductive structure. The photoconductive structure is placed in a cassette or other holder positioned with respect to the readout scanner, which scans across the photoconductive structure in scan patterns of successive pulsed laser spots which will correspond to the pixels of the image. Elongated strip electrodes and charge amplifiers receive charge movements due to the pulse spots of the scanner. The photoconductive structure preferably has a reference strip which can be sensed by the scanner to provide a measure from a standardized Optical Start of Scan, and the Plate Start of Scan. This measurement, referred to as line skew, is a measure of the positioning errors, which will cause displacement of the scan patterns of pulse spots from their expected positions with respect to the elongate strip electrodes. This system provides skew compensation to determine which electrode and which adjacent electrodes correspond to specific scan spots, so that the charge movements received thereby can be properly combined to form the correct charge value for the image pixel represented by each scan spot. In a preferred embodiment, the measurements taken by the skew measurement circuitry are filtered to provide a smoothed measurement of the skew for each line and the incremental skew per line.

REFERENCES:
patent: 4176275 (1979-11-01), Korn et al.
patent: 5268569 (1993-12-01), Nelson et al.
patent: 5374993 (1994-12-01), Diehl et al.

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