Image analysis – Image compression or coding – Transform coding
Reexamination Certificate
2008-01-22
2008-01-22
Sherali, Ishrat (Department: 2624)
Image analysis
Image compression or coding
Transform coding
Reexamination Certificate
active
07321698
ABSTRACT:
According to the present invention, methods and apparatus for filtering transform coefficients are provided. Transform coefficients associated with an input bit sequence can be zeroed to provide modified transform coefficients associated with an output bit sequence. The transform coefficients may represent information in a portion of data such as a video frame, a picture, or an audio stream. In one example, the transform coefficients are DCT coefficients of an MPEG-2 video sequence. The transform coefficients are filtered to provide modified transform coefficients associated with an output bit sequence. The output bit sequence is a rescaled version of the input bit sequence.
REFERENCES:
patent: 5005076 (1991-04-01), Stroppina et al.
patent: 5907374 (1999-05-01), Liu
patent: 6002801 (1999-12-01), Strongin et al.
patent: 6181711 (2001-01-01), Zhang et al.
patent: 6236749 (2001-05-01), Satonaka et al.
patent: 6335990 (2002-01-01), Chen
patent: 6359999 (2002-03-01), Moriwaki et al.
patent: 6412112 (2002-06-01), Barrett et al.
patent: 6516096 (2003-02-01), Yokose et al.
patent: 6553148 (2003-04-01), Zeng et al.
patent: 6556624 (2003-04-01), Orchard et al.
patent: 6661923 (2003-12-01), Koike et al.
patent: 6687296 (2004-02-01), Sato et al.
patent: 6763070 (2004-07-01), Lee
G. Keesman, R. Hellinghuizen, F. Hoeksema, G. Heideman, “Transcoding of MPEG bitstreams”, Signal Processing: Image Communication, vol. 8 (1996), pp. 481-500.
Brian C. Smith, “A Survey of Compressed Domain Processing Techniques,” downloaded from www.uky.edu, Mar. 20, 2001, 10 pages.
Anthony Vero, “MPEG-4 Rate Control for Multiple Video Objects,”IEEE Transactions on Circuits and Systems for Video Technology, vol. 9, No. 1, Feb. 1999, pp. 186-199.
Wu et al., “Methods and Apparatus for Updating A Reduction Ratio,” U.S. Appl. No. 09/867,967, filed May 29, 2001, 55 pages.
Yuen-Wen Lee, “Methods and Apparatus for Selecting a Cut-off Index,” U.S. Appl. No. 09/870,177, filed May 29, 2001, 53 pages.
U.S. Appl. No. 09/608,128, entitled “Methods and Apparatus for Bandwidth Scalable Transmission of Compressed Video Data through Resolution Conversion”, inventor(s): Zhang, filed Jun. 30, 2000.
U.S. Appl. No. 09/766,020, entitled “Methods for Efficient Bandwidth Scaling of Compressed Video Data”, inventor(s): Zhang, filed Jan. 18, 2001.
U.S. Appl. No. 09/867,967, entitled “Methods and Apparatus for Updating a Reduction Ratio”, inventor(s): Shen, filed May 29, 2001.
Office Action dated Jun. 15, 2005, U.S. Appl. No. 09/867,967.
Office Action dated Jun. 20, 2003, U.S. Appl. No. 09/870,177.
Ramakrishnan Sangeeta
Shen Ke
Tse Yi Tong
Wu Fang
Beyer & Weaver, LLP
Cisco Technology Inc.
Sherali Ishrat
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