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:
Apr. 26, 2011
Filed:
Mar. 24, 2004
Michael Hansen, Kiel, DE;
Jörg Olaf Von Wechgeln, Wattenbek, DE;
Michael Hansen, Kiel, DE;
Jörg Olaf Von Wechgeln, Wattenbek, DE;
Heidelberger Druckmaschinen AG, Heidelberg, DE;
Abstract
A method of gray value correction for binary image data, preferably screened image data, with a local gray value by a desired correction magnitude includes filtering the image data quantized with n bits with an asymmetrical low-pass filter whose filter window is smaller than a screen cell. By a threshold value operation, corrected binary image data is obtained from the filtered image data. Optimum threshold values are selected from a threshold value table as a function of the local gray value and of the desired correction magnitude.
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