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:
Sep. 15, 2009
Filed:
Apr. 12, 2006
Zhigang Fan, Webster, NY (US);
Ricardo DE Queiroz, Brasilia, BR;
Reiner Eschbach, Webster, NY (US);
Shen-ge Wang, Fairport, NY (US);
Zhigang Fan, Webster, NY (US);
Ricardo de Queiroz, Brasilia, BR;
Reiner Eschbach, Webster, NY (US);
Shen-Ge Wang, Fairport, NY (US);
Xerox Corporation, Norwalk, CT (US);
Abstract
A process for improving the reconstruction of images compressed by the wavelet-based JPEG2000 specification. The basic reconstruction is followed by an edge-preserving filter (such as a sigma filter), another transform to the wavelet domain, an adjustment in the wavelet domain to yield the same quantized values as the compressed input image, and, finally, an inverse wavelet transform to yield the improved image. The process reduces the artifacts in sharp text and graphics documents, yielding images that would otherwise require larger files.