Identifying a color separation wherein a banding defect originates
AssigneeXerox Corporation
InventorsBeilei Xu, Wencheng Wu
Life of this patent
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Abstract
What is disclosed is a novel system and method for banding defect detection in user document images to improve image quality trend analysis in multifunction digital imaging system architectures. The present banding detection process uses region-based, time sequence analysis, and graylevels of image regions in a collection of a sequence of regions, to improve banding detection. The present method independently analyzes the colorant separations to detect banding due to sources that are colorant-dependent, e.g., due to a single developer housing. This identification can be performed in the presence of multiple banding defects.
Claims25
A method for identifying a color separation in which a banding defect in a digital imaging system originates, the method comprising:
- scanning a plurality of digital images, each corresponding to a page printed by a digital imaging system whereon banding defects are intended to be detected and analyzed;
- identifying, within each image of said scanned digital images, a plurality of segmented regions each comprising standard image regions of each image;
- using region-based banding detection to detect banding defects in said plurality of scanned digital images;
- calculating color values for each segmented region in which a banding defect has been detected;
- identifying a color separation in which each of said detected banding defects originates based upon said color values and a set of reference vectors;
- and
- initiating an activity associated with said digital imaging system in response to a color separation of the banding defect having been identified.
A system for identifying a color separation in which a banding defect originates in a digital imaging system, said system comprising:
- a memory;
- a storage medium for storing data;
- and
- a processor in communication with said storage medium and said memory, said processor executing machine readable instructions for performing the method of:
- scanning a plurality of digital images, each corresponding to a page printed by a digital imaging system whereon banding defects are intended to be detected and analyzed;
- identifying, within each image of said scanned digital images, a plurality of segmented regions each comprising standard image regions of each image;
- using region-based banding detection to detect banding defects in said plurality of scanned digital images;
- calculating color values for each segmented region in which a banding defect has been detected;
- identifying a color separation in which each of said detected banding defects originates based upon said color values and a set of reference vectors;
- and
- initiating an activity associated with said digital imaging system in response to a color separation of the banding defect having been identified.
A computer implemented method for identifying a color separation in which a banding defect originates in a digital imaging system, the method comprising:
- scanning a plurality of digital images, each corresponding to a page printed by a digital imaging system whereon banding defects are intended to be detected and analyzed;
- identifying, within each image of said scanned digital images, a plurality of segmented regions each comprising standard image regions of each image;
- using region-based banding detection to detect banding defects in said plurality of scanned digital images comprising:
- determining banding frequency information from at least one color parameter value within each of said identified segmented regions;
- estimating a banding amplitude for each recurring banding frequency which repeats within said banding frequency information over said plurality of scanned digital images;
- and
- detecting at least one banding defect based upon said estimated banding amplitude and said recurring banding frequency;
- calculating color values for each segmented region in which a banding defect has been detected;
- identifying a color separation in which each of said detected banding defects originates based upon said color values and a set of reference vectors;
- and
- initiating an activity associated with said digital imaging system in response to a color separation of the banding defect having been identified.
Dependencies are inferred from the claim text.