Back to results
US 5,450,165 AGranted
System for identifying areas in pre-existing image data as test patches for print quality measurement
AssigneeXerox Corporation
InventorThomas A. Henderson
Life of this patent
Estimating the term…
Abstract
In a printing apparatus for creating images on a sheet in response to digital data, the incoming data is polled for image data corresponding to a preselected density condition, such as a particular half-tone, on an area of the final image. The area having the density condition can be used as a test patch to monitor overall print quality.
Claims16
A method of controlling a printing machine, comprising the steps of:
- forming a visible image of a selected portion of information being printed by the printing machine;
- polling the portion of information for information consistent with an area in the visible image having a preselected density condition;
- and
- determining the visible image density in the area having the preselected density condition.
1 more element
A system for controlling a printing machine, comprising:
- an image receiving member;
- means for forming a visible image of a selected portion of information being printed by the printing machine on the receiving member;
- means for polling the portion of information for information consistent with an area in the visible image having a preselected density condition;
- and
- means for sensing the area having the preselected density condition on the receiving member.
2 more elements
A method of testing print quality in a printing machine, comprising the steps of:
- polling the subset of image data for image data corresponding to a preselected density condition;
- and
- identifying, for an image to be printed, image data corresponding to a preselected density condition within a subset of image data corresponding to a preselected location of the image to be printed.
Dependencies are inferred from the claim text.