Image analysis – Image compression or coding – Transform coding
Reexamination Certificate
2006-02-21
2006-02-21
Johns, Andrew W. (Department: 2621)
Image analysis
Image compression or coding
Transform coding
C382S275000
Reexamination Certificate
active
07003170
ABSTRACT:
Block-based image processing methods and apparatus that provide a reduction in block-transform image coding artifacts are described. In various embodiments, the invention is directly incorporated into a decoding process. In such embodiments, transform coefficients are modified in simple but particularly effective ways that reduce or eliminate many of the artifacts that were caused by the quantization of the transform coefficients during encoding and/or by independent block processing during encoding. In other embodiments, the invention is used on an image that has already been decoded. In such embodiments image data values are directly modified in a block-based fashion or a forward block transform is applied and then the methods of the invention for processing transform coefficient blocks are used, followed by an inverse transform operation to generate pixel values from the resulting processed transform coefficient blocks.
REFERENCES:
patent: 5454051 (1995-09-01), Smith
patent: 5737451 (1998-04-01), Gandhi et al.
patent: 5937101 (1999-08-01), Jeon et al.
patent: 6028967 (2000-02-01), Kim et al.
patent: 6188728 (2001-02-01), Hurst
patent: 6317522 (2001-11-01), Rackett
patent: 6427031 (2002-07-01), Price
patent: 6529638 (2003-03-01), Westerman
patent: 6813387 (2004-11-01), Berkner et al.
patent: 2003/0138150 (2003-07-01), Srinivasan
patent: 2005/0058354 (2005-03-01), Weintraub et al.
S. A. Martucci, “A New Approach for Reducing Blockiness in DCT Image Coders”, Scitex Digital Video, IEEE, 1998, pp. 2549-2552.
G. A. Triantafyllidis, D. Tzovaras and M. G. Strintzis, “Blocking Artifact Reduction in Frequency Domain”, Informatics and Telematics Institute, IEEE, 2001, pp. 269-272.
Elton John H.
Martucci Stephen A.
Alavi Amir
Johns Andrew W.
Pegasus Imaging Corporation
Straub Michael P.
Straub & Pokotylo
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