Method and apparatus for printing an image in a specified positi

Details Method and apparatus for printing an image in a specified positi Method and apparatus for printing an image in a specified positi

1992-11-04

1995-07-18

Powell, Mark R.

Optics: measuring and testing

Range or remote distance finding

With photodetection

395117, 356401, G03C 1102

Patent

active

054349567

ABSTRACT:
Each two-dimensional alignment mark on a printing medium is found by using information about the whole mark area, or with respect to each of two different directions relative to the medium by using a distinctive two-dimensional pattern or characteristic of the mark; or by finding the mark centroid, or by scanning the mark region to obtain a two-dimensional representation for analysis--and preferably by combinations of these procedures. An image is then aligned and printed by reference to the mark so located. A previous image may also be preprinted in known relation with the mark, so that the new image is aligned with the preprinted one--sometimes on the same piece of medium. Preferably information used includes the mark's intended size, shape, areal disposition and other properties; and a two-dimensional search template is defined which matches the mark in at least one of these. A template position is then found that essentially maximizes areal intersection with the mark; this position is then treated as the mark position, for printing the new image. The invention preferably determines a position of the template along each of two directions in alternation--maximizing the areal intersection with respect to shifting along each direction, iteratively--until no significant increase is obtained.

REFERENCES:
patent: 4569584 (1986-11-01), St. John et al.
patent: 4857715 (1989-08-01), Koch et al.

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