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:
May. 06, 2008
Filed:
Jan. 10, 2005
Brian D. Busch, Sudbury, MA (US);
Dirk W. Hertel, Quincy, MA (US);
Leif D. Hille, Natick, MA (US);
Suhail S. Saquib, Shrewsbury, MA (US);
Brian D. Busch, Sudbury, MA (US);
Dirk W. Hertel, Quincy, MA (US);
Leif D. Hille, Natick, MA (US);
Suhail S. Saquib, Shrewsbury, MA (US);
Polaroid Corporation, Concord, MA (US);
Abstract
A method for controlling the print density of individual heating elements of a thermal print head array determines respective energy values for each heating element in response to image pixel data to be printed, multiplies determined energy values by a respective predetermined correction factor for one or more respective heating elements for improving print density consistency between individual heating elements, and dithers adjusted energy values from the step of multiplying as a function of adjacent image pixels.