Image analysis – Image transformation or preprocessing – Combining image portions
Reexamination Certificate
1998-03-24
2001-02-27
Mehta, Bhavesh (Department: 2721)
Image analysis
Image transformation or preprocessing
Combining image portions
C358S450000, C250S208100
Reexamination Certificate
active
06195471
ABSTRACT:
FIELD OF THE INVENTION
The present invention is in the field of imaging systems. More particularly, the present invention provides a method and apparatus for combining (“stitching”) a plurality of images produced by multiple imaging sources into a single image without creating a visible seam or other artifacts at the interfaces between the plurality of images.
BACKGROUND OF THE INVENTION
Flatfield scanning is commonly used in a number of applications, including flatbed scanners, capstan imagesetters, and even some external drum systems (e.g., large capstans). A serious limitation of many flatfield scanning systems is that there are practical limits to the length of the scan line. This generally limits the page width of these systems to the range of 14 to 18 inches.
In an attempt to overcome this page width limitation, efforts have been made, with limited success, to combine the partial scan lines produced by a plurality of imaging sources into a single, composite image. Unfortunately, the seams between the partial scan lines produced by each imaging source are generally highly visible in the composite image. Additional artifacts produced by in-scan errors, cross-scan errors, pixel size variations, exposure variations, and other factors, may also be introduced, further diminishing the quality of the composite image. The in-scan and cross-scan errors may be produced for a number of reasons including spinner synchronization errors, thermally induced errors, or mechanical misalignment.
The present invention incorporates many unique features which eliminate these and other problems associated with the use of multiple imaging sources to create a single image.
SUMMARY OF THE INVENTION
The present invention provides various methods and apparatus for eliminating artifacts in an image formed using a plurality of imaging sources. For example, the present invention provides a unique stitching method for eliminating visible seams in the image by randomizing the stitch point between the scan lines produced by each imaging source. The randomization may be further optimized by additionally applying a method for relocating the random stitch point based on the data content of the scan line, adjacent scan lines, and other criteria.
The present invention also provides methods and apparatus for substantially eliminating in-scan and cross-scan errors caused by thermally induced errors, spinner synchronization errors, mechanical misalignment, and other factors associated with the use of a plurality of imaging systems. A unique photodetector system, comprising a mask having a pair of triangular openings, provides measurements of the in-scan and cross-scan errors.
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Agfa Corporation
Kelley Edward L.
Mehta Bhavesh
Merecki John A.
Sherali Ishrat
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