Missing band detection
AssigneesHewlett-Packard Development Company, L.P., Purdue Research Foundation
InventorsWan-Eih Huang, Jan Allebach, Richard Eric Maggard, Renee Jeanette Jessome, Mark Quentin Shaw
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Abstract
Examples of methods are described herein. In some examples, a method includes calculating a first cost function measure based on band defects in an image. In some examples, the method also includes calculating a second cost function measure based on the band defects and a synthetic band. In some examples, the method further includes detecting a missing band based on a comparison of the first cost function measure and the second cost function measure.
Claims15
A method, comprising:
- calculating a first cost function measure based on band defects in an image, wherein the image is an image of a printed page produced by a printer;
- calculating a second cost function measure based on the band defects and a synthetic band;
- and
- detecting a missing band based on a comparison of the first cost function measure and the second cost function measure.
An apparatus, comprising:
- a memory;
- a processor coupled to the memory, wherein the processor is to:
- determine a set of periodic band defects in an image based on a first cost function estimation, wherein the image is an image of a printed page produced by a printer;
- insert a synthetic band in a case that there is a detected band defect at an interval multiple from the set of periodic band defects;
- and
- determine that there is a missing band corresponding to the synthetic band based on a second cost function estimation.
A non-transitory tangible computer-readable medium storing executable code, comprising:
- code to cause a processor to determine candidate sets of periodic band defects from a set of band defects in an image based on respective first cost function computations, wherein the image is an image of a printed page produced by a printer;
- code to cause the processor to, in response to determining to update a candidate set of periodic band defects, perform a second cost function computation for the candidate set of periodic band defects using a synthetic band;
- and
- code to cause the processor to update the candidate sets of periodic band defects in a case that the second cost function computation indicates an error reduction relative to a first cost function computation.
Dependencies are inferred from the claim text.