Typewriting machines – Including selection of type-face by... – Including error detection
Patent
1999-09-09
2000-12-26
Hilten, John S.
Typewriting machines
Including selection of type-face by...
Including error detection
B41J 342
Patent
active
061648477
ABSTRACT:
A system and method for detecting imaging parameters includes forming a first image generated with pseudorandom noise and a second image generated with the same pseudorandom noise that serve as an imaging parameter sensor when the first and second images are superimposed. The sensor is useful for visually detecting such imaging parameters such as geometric errors. In one embodiment, the first and second patterns are generated with pseudorandom noise by modulating a repetitive pattern with pseudorandom noise. In another embodiment, the first and second patterns are generated with pseudorandom noise by forming a pseudorandom image and the reverse of the image, and phase shifting one or both of the images.
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Agfa Corporation
Heffran Ira V.
Hilten John S.
Nolan, Jr. Charles H.
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