Method and appratus for automatically locating predefined exposu

Details Method and appratus for automatically locating predefined exposu Method and appratus for automatically locating predefined exposu

1991-08-23

1993-03-30

Fuller, Benjamin R.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358406, 358449, 358453, 358464, 395117, H04N 123, H04N 138

Patent

active

051989077

ABSTRACT:
Exposure areas in a calibration original are automatically found by reference to a registration mark having a predetermined dimensional orientation relative to the exposure areas. A scanner produces image signals representative of both the exposure areas and the registration mark. A pattern recognition module employs edge detection to distinguish image signals corresponding to the registration mark. Two-dimensional Cartesian coordinates are then extracted from the registration mark and used to further distinguish image signals corresponding to the exposure areas, thereby locating exposure areas although the original may not be properly aligned in the scanner. A preferred registration mark is a pair of orthogonal, intersecting guide bars. By further defining the nominal length of the guide bars, the size of the mark can be established and the exposure areas can be located despite dimensional changes due to magnification error in the scanner.

REFERENCES:
patent: 4471386 (1984-09-01), Tuhro
patent: 4777515 (1988-10-01), Aikoh
patent: 4933778 (1990-06-01), Tufano
patent: 5033102 (1991-07-01), Nakajima
Kodak Color Reproduction Guides, User's Guide, Q-60 (copyright, 1988), including front cover, inside jacket, pp. 2, 16-20, 30-32, back cover.
Input Color Calibration Software User's Guide, Kodak Electronic Printing Systems, Inc. (copyright May, 1991.

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