Method and apparatus for registering color separation film

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

1987-09-22

1989-07-18

Sikes, William L.

Boots, shoes, and leggings

364525, 364559, 358101, 358107, 358456, 382 8, 382 52, 382 54, G01S 1300

Patent

active

048499145

ABSTRACT:
An algorithmic based method and apparatus for registering halftone color separations using edge based registration techniques. Digital pictures are taken at two locations on each film, and, following optimal thresholding of the data, the edges are located by application of a Laplacian of a Gaussian edge detection operator. Sampling is used to reduce the computational requirements, and full resolution is restored by interpolation. The edge locations are corrected for operator edge bias, and the corrected edge points are linked into segments which are registered by the parameter space method. The initial offset is corrected for size differences by application of least squares correction techniques.

REFERENCES:
patent: 4641244 (1987-02-01), Wilson et al.

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