Method and apparatus for registering color film separations

Details Method and apparatus for registering color film separations Method and apparatus for registering color film separations

1989-08-04

1991-06-11

Lall, Parshotam S.

Boots, shoes, and leggings

358214, H04N 5253

Patent

active

050238159

ABSTRACT:
An algorithmically based method and apparatus for registering halftone color separations using edge based registration techniques and three registration points on each film separation in order to handle image stretching in both directions. Improved techniques include the use of gray level transformation, an improved U.S.C. predicate, double accuracy interpretation after systematic convolution sampling, finer angle sweeping to achieve smoother edge transitions around sharp corners, elimination of gaps in the edge continuity, enhancement of final edge linking, a more accurate and robust segment matching algorithm, invocation of a registration quality index for quality control checking of each segment picture registration, and reduction of machine cycle time by performing computations concurrently with machine movement.

REFERENCES:
patent: 3736564 (1973-05-01), Watkins
patent: 3851315 (1974-11-01), Anderson
patent: 4641244 (1987-02-01), Wilson et al.
patent: 4837711 (1989-06-01), Suzuki
patent: 4849914 (1989-07-01), Medioni et al.
patent: 4875102 (1989-10-01), Poetsch
patent: 4903131 (1990-02-01), Lingemann et al.

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