Image analysis – Image enhancement or restoration – Edge or contour enhancement
Reissue Patent
2007-10-30
2010-06-29
Rogers, Scott A (Department: 2625)
Image analysis
Image enhancement or restoration
Edge or contour enhancement
C382S261000, C375S240290, C358S003260
Reissue Patent
active
RE041405
ABSTRACT:
delete-start id="DEL-S-00001" date="20100629" ?A method and apparatus to remove a block effect and a ring effect appearing in a compression-coded image is disclosed. The present invention is especially applicable to an image compression-coded at a low bit rate. In particular, the present invention includes a variety of masks for the removal of the block/ring effect. Thus, one mask is select for a pixel to be filtered. Moreover, candidate pixels to be averaged with the pixel to be filtered is selected from the pixels of the selected mask to better maintain the details of the image, and a weight is applied to improve the calculation speed of the averaging operation. More particularly, the masks according to the present invention have longer tabs toward adjacent blocks at boundaries of the given block to remove the block and ring effect.delete-end id="DEL-S-00001" ?insert-start id="INS-S-00001" date="20100629" ?In an embodiment, the filtering unit is configured to select at least four pixels of successive pixels according to a position of a pixel to be filtered. The four pixels include the pixel to be filtered. At least one of the four pixels may be in a first block, and three of the four pixels may be in a second block adjacent to the first block. The pixel to be filtered is in the second block.insert-end id="INS-S-00001" ?
REFERENCES:
patent: 5122875 (1992-06-01), Raychaudhuri et al.
patent: 5283646 (1994-02-01), Bruder
patent: 5367385 (1994-11-01), Yuan
patent: 5488570 (1996-01-01), Agarwal
patent: 5555028 (1996-09-01), Kim
patent: 5563813 (1996-10-01), Chen et al.
patent: 5611000 (1997-03-01), Szeliski et al.
patent: 5694492 (1997-12-01), Kim
patent: 5748795 (1998-05-01), Ohnishi et al.
patent: 5748799 (1998-05-01), Shimura
patent: 5787210 (1998-07-01), Kim
patent: 5790131 (1998-08-01), Liang et al.
patent: 5877813 (1999-03-01), Lee et al.
patent: 5878166 (1999-03-01), Legall
patent: 5883983 (1999-03-01), Lee et al.
patent: 5933541 (1999-08-01), Kutka et al.
patent: 5937101 (1999-08-01), Jeon et al.
patent: 5940536 (1999-08-01), Wake et al.
patent: 5970179 (1999-10-01), Ito
patent: 5974196 (1999-10-01), Chang et al.
patent: 5974197 (1999-10-01), Lee et al.
patent: 6041145 (2000-03-01), Hayashi et al.
patent: 6058210 (2000-05-01), de Queiroz et al.
patent: 6108455 (2000-08-01), Mancuso
patent: 6167164 (2000-12-01), Lee
patent: 6178205 (2001-01-01), Cheung et al.
patent: 6188799 (2001-02-01), Tan et al.
patent: 6192081 (2001-02-01), Chiang et al.
patent: 6195632 (2001-02-01), Pearson
patent: 6222641 (2001-04-01), Karidi
patent: 6226050 (2001-05-01), Lee
patent: 6246802 (2001-06-01), Fujihara et al.
patent: 6259823 (2001-07-01), Lee et al.
patent: 6320987 (2001-11-01), Chu
patent: 6360014 (2002-03-01), Boon
patent: 6360024 (2002-03-01), Tan et al.
patent: 6381275 (2002-04-01), Fukuhara et al.
patent: 6385245 (2002-05-01), De Haan et al.
patent: 6415055 (2002-07-01), Kato
patent: 6463182 (2002-10-01), Onishi et al.
patent: 6504873 (2003-01-01), Vehvilainen
patent: 6529638 (2003-03-01), Westerman
patent: 6535643 (2003-03-01), Hong
patent: 6594400 (2003-07-01), Kim
patent: 6631162 (2003-10-01), Lee et al.
patent: 6665346 (2003-12-01), Lee et al.
patent: 7054503 (2006-05-01), Ishikawa
patent: 7162090 (2007-01-01), Miura et al.
patent: 7215823 (2007-05-01), Miura et al.
patent: 7302104 (2007-11-01), Suino
patent: 7305142 (2007-12-01), Kim et al.
patent: 2003/0044080 (2003-03-01), Frishman et al.
patent: 2004/0179610 (2004-09-01), Lu et al.
patent: 2005/0147319 (2005-07-01), Deshpande et al.
patent: 2005/0196066 (2005-09-01), Kim et al.
patent: 2005/0201633 (2005-09-01), Moon et sal.
patent: 2006/0078055 (2006-04-01), Kanazawa
patent: 2007/0140574 (2007-06-01), Yamaguchi et al.
patent: 2007/0258657 (2007-11-01), Kryda et al.
patent: 2007/0292042 (2007-12-01), Kim et al.
patent: 2007/0292043 (2007-12-01), Kim et al.
patent: 01070719 (1989-03-01), None
patent: 9-326024 (1997-12-01), None
patent: 09326024 (1997-12-01), None
patent: 10-70719 (1998-03-01), None
patent: WO 99/04497 (1999-01-01), None
Pang, Khee K. et al. “Optimum Loop Filter in Hybrid Coders.” IEEE Circuits And Systems For Video Technology, vol. 4, No. 2, Apr. 1994, pp. 158-167.
Yang et al. “Iterative Projection Algorithms For Removing the Blocking Artifacts of Bock-DCT Compressed Images.” IEEE 1993, pp. V405-V408.
Zakhor. “Iterative Procedures for Reduction of Blocking Effects in Transform Image Coding.” IEEE Transactions on Circuits and Systems for Video Technology, vol. 2, No. 1, IEEE Mar. 1993, pp. 91-95.
Korean Office Action dated Jul. 18, 2005, with English translation.
Harness Dickey & Pierce PLC
LG Electronics Inc.
Rogers Scott A
LandOfFree
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