Image position error detection technique

Details Image position error detection technique Image position error detection technique

1997-01-28

1999-01-12

Burr, Edgar

Typewriting machines

Including selection of type-face by...

Including error detection

101248, B41J 346

Patent

active

058577840

ABSTRACT:
A method for detecting image position errors, includes forming a first pattern with a symbol embedded therein and a second pattern which, when superpositioned on the first pattern, exposes the symbol if the misalignment between the first and second patterns exceeds a position error tolerance. The symbol is perceivable with the unaided eye even if the misalignment is imperceivable to the unaided eye.

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Raph Levien, "Highly sensitive register mark based on moire patterns", SPIE vol. 1912, Color Hard Copy and Graphic Arts II (1993), pp. 423-427.

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