The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 01, 2013
Filed:
Oct. 15, 2010
Nancy Wang, Sunnyvale, CA (US);
Karl Lang, Madison, WI (US);
Nancy Wang, Sunnyvale, CA (US);
Karl Lang, Madison, WI (US);
Apple Inc., Cupertino, CA (US);
Abstract
Print performance is evaluated by printing a diagnostic image comprising color patches. Colorant usage in the printed image is measured by, for instance, scanning each patch. Measured color values are then compared to target color values. Based on the comparison, groups of patches whose color values vary significantly from expectations are identified. Variant groups are then analyzed to identify, in addition to color quality control problems, spatial problems that affect only a localized area of a printed page. Such spatial problems may include, for example, problems with contrast or streaks. A heat map illustrating the differences may be generated to help an operator visualize the spatial problem. A template for the diagnostic image may be selected from a plurality of randomly generated diagnostic targets based on total colorant usage for at least one colorant in each column of color patches. Certain patches may be predefined across for each candidate target.