Chronic interline phase error from an image scanner generating p

Details Chronic interline phase error from an image scanner generating p Chronic interline phase error from an image scanner generating p

1974-11-18

1976-04-13

Libman, George H.

Telegraphy

Systems

Line-clearing and circuit maintenance

H04N 102

Patent

active

039506150

ABSTRACT:
A cylindrical scanner scans two lines of a document for each revolution, and has two marks spaced approximately 180.degree. from each other which generate a synchronizing signal for each scanline. In order to allow for production inaccuracies in the relative placement of the two marks, means are provided for shifting the scanning signals for each alternate scanline by an amount which corresponds to the error in the relative positions of the two synchronizing signal marks. Thus, the resulting scanlines are in proper phase relationship with each other.

REFERENCES:
patent: 2945414 (1960-07-01), Blackstone
patent: 3665100 (1972-05-01), Pinkham

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