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公开(公告)号：US10715683B2
公开(公告)日：2020-07-14
申请号：US16462708
申请日：2017-01-25
Applicant: Hewlett-Packard Development Company, L.P.
Inventor： Zuguang Xiao , Richard E Maggard , Amy Reibman , Mark Shaw , Jan Allebach
Abstract: In some examples, print quality diagnosis may include aligning corresponding characters between a scanned image of a printed physical medium aligned to a master image associated with generation of the printed physical medium to generate a common mask. Print quality diagnosis may further include determining, for each character of the scanned image, an average value associated with pixels within the common mask, and determining, for each corresponding character of the master image, the average value associated with pixels within the common mask. Further, print quality diagnosis may include determining, for each character of the common mask, a metric between the average values associated with the corresponding characters in the scanned and master images.
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公开(公告)号：US20200084320A1
公开(公告)日：2020-03-12
申请号：US16462708
申请日：2017-01-25
Applicant: Hewlett-Packard Development Company, L.P.
Inventor： Zuguang Xiao , Richard E Maggard , Amy Reibman , Mark Shaw , Jan Allebach
Abstract: In some examples, print quality diagnosis may include aligning corresponding characters between a scanned image of a printed physical medium aligned to a master image associated with generation of the printed physical medium to generate a common mask. Print quality diagnosis may further include determining, for each character of the scanned image, an average value associated with pixels within the common mask, and determining, for each corresponding character of the master image, the average value associated with pixels within the common mask. Further, print quality diagnosis may include determining, for each character of the common mask, a metric between the average values associated with the corresponding characters in the scanned and master images.
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公开(公告)号：US10999452B2
公开(公告)日：2021-05-04
申请号：US16604154
申请日：2018-01-25
Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
Inventor： Richard E Maggard , Mark Shaw , Katelyn Christene Morse , Jan Allebach , Zuguang Xiao , Shaoyuan Xu
Abstract: Pixel blocks of a user-generated print job raster page are clustered into raster color clusters, and pixel blocks of a corresponding scanned page are clustered into scanned color clusters. For each raster color cluster, if a color difference between the cluster and a corresponding scanned color cluster is greater than a threshold, color fading of the cluster is determined from simulated depletion of each colorant of a printing device, and a likely depleted colorant is determined based on the corresponding scanned color cluster and the determined color fading. A most likely depleted colorant is determined from the likely depleted colorant predicted for each raster color cluster for which the determined color difference is greater than the threshold.
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