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US 10,834,283 B2Granted
Methods, apparatuses, and systems for detecting printing defects and contaminated components of a printer
AssigneeDatamax-O'Neil Corporation
InventorsSebastien d'Armancourt, Thomas Axel Jonas Celinder, H Sprague Ackley, Glenn David Aspenns
Life of this patent
Estimating the term…
Abstract
A method for printing defect detection includes processing and analyzing a difference image obtained by comparing an image scanned with a verifier to a reference image. The detected defects are grouped, and the grouping is refined. Confidence level values are then assigned to the refined groups, and analysis is performed to determine if one or more servicing actions should be taken.
Claims18
A method for generating a difference image, comprising:
- accessing a scanned image, wherein the scanned image is a digital representation of a media output by a printer;
- scaling the scanned image to match a size of a reference image;
- adjusting luminance of the scaled scanned image;
- conducting a pixel-to-pixel analysis between the luminance adjusted scanned image and the reference image;
- generating a difference image based on results of the pixel-to-pixel analysis;
- identifying one or more groups of bright pixels in the difference image;
- determining a confidence level of each of the one or more groups of bright pixels, based on a count of bright pixels in respective one of the one or more groups of bright pixels;
- and
- identifying the one or more errors with the printer based on the determined confidence level for each of the one or more groups of bright pixels.
6 more elements
A method for image processing, comprising:
- accessing a produced image, wherein the produced image is a representation of a media output by a printer;
- generating a reference image based on a print command string;
- normalizing a size of the produced image to match a size of the reference image;
- normalizing a luminance of the size normalized produced image to match a luminance of the reference image;
- producing a difference image by comparing the luminance normalized produced image to the reference image;
- identifying one or more groups of bright pixels in the difference image;
- determining a confidence level for each of the one or more groups of bright pixels, based on a count of bright pixels in respective one of the one or more groups of bright pixels;
- and
- detecting one or more printing defects based on the determined confidence level for each of the one or more groups of bright pixels.
6 more elements
A method for print defect detection, comprising:
- scanning a printed media with a verifier to generate a captured image, wherein the verifier is associated with a printer;
- processing the captured image to match one or more parameters of the captured image to one or more parameters of a reference image;
- comparing the processed captured image to the reference image to identify one or more groups of bright pixels;
- determining a confidence level for each of the one or more groups of bright pixels, based on a count of bright pixels in respective one of the one or more groups of bright pixels;
- and
- detecting one or more print defects related to the printer based on the determined confidence level for each of the identified one or more groups of bright pixels.
3 more elements
Dependencies are inferred from the claim text.