Systems and methods for associating color profiles with a scanned input image using spatial attributes
First Claim
Patent Images
1. A method for identifying one or more color calibration profiles for use with a scan of a printed image, comprising:
- scanning the printed image to generate scanned image data;
performing the following steps using a computer;
determining a spatial characteristic of the printed image from the scanned image data;
comparing the spatial characteristic of the scanned printed image with spatial characteristics associated with color calibration profiles; and
selecting one or more color calibration profiles based on the comparison of the spatial characteristics, whereinthe selected one or more color calibration profiles alter a chrominance value, andthe selecting comprises executing the following decision tree;
first, distinguishing between a continuous marking process and a halftone marking process based on a degree of local variation;
second, determining whether a halftone marking process is identified and, if a halftone marking process is identified, distinguishing between an ink-jet marking process and a xerographic or offset marking process based on a degree of periodicity, and if a halftone marking process is not identified, ending the executing of the decision tree; and
third, determining if a xerographic or offset marking process is identified and, if a xerographic or an offset marking process is identified, distinguishing between a xerographic marking process and an offset marking process based on a degree of noise.
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Abstract
Methods and systems used to associate color calibration profiles with scanned images based on identifying the marking process used for an image on a substrate using spatial characteristics and/or color of the image. Image types which are classified and identified include continuous tone images and halftone images. Among halftone images separately identified are inkjet images, xerographic images and lithographic images. Locally adaptive image threshold techniques may be used to determine the spatial characteristics of the image.
45 Citations
11 Claims
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1. A method for identifying one or more color calibration profiles for use with a scan of a printed image, comprising:
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scanning the printed image to generate scanned image data; performing the following steps using a computer; determining a spatial characteristic of the printed image from the scanned image data; comparing the spatial characteristic of the scanned printed image with spatial characteristics associated with color calibration profiles; and selecting one or more color calibration profiles based on the comparison of the spatial characteristics, wherein the selected one or more color calibration profiles alter a chrominance value, and the selecting comprises executing the following decision tree; first, distinguishing between a continuous marking process and a halftone marking process based on a degree of local variation; second, determining whether a halftone marking process is identified and, if a halftone marking process is identified, distinguishing between an ink-jet marking process and a xerographic or offset marking process based on a degree of periodicity, and if a halftone marking process is not identified, ending the executing of the decision tree; and third, determining if a xerographic or offset marking process is identified and, if a xerographic or an offset marking process is identified, distinguishing between a xerographic marking process and an offset marking process based on a degree of noise. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification
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Current AssigneeXerox Corporation (Xerox Holdings Corp.)
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Original AssigneeXerox Corporation (Xerox Holdings Corp.)
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InventorsWang, Shen-ge, Eschbach, Reiner, Sharma, Gaurav
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Primary Examiner(s)Hung; Yubin
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Application NumberUS10/604,201Publication NumberTime in Patent Office2,017 DaysField of Search382/162, 382/165, 382/224, 382/225, 382/167, 345/590, 358518-523US Class Current382/165CPC Class CodesG06T 7/90 Determination of colour cha...H04N 1/603 controlled by characteristi...H04N 1/6072 adapting to different types...
