Method of changing bit rate by changing codeword of...

Details Method of changing bit rate by changing codeword of... Method of changing bit rate by changing codeword of...

2002-04-22

2008-11-11

Hung, Yubin (Department: 2624)

Image analysis

Image compression or coding

Lossless compression

C382S166000, C358S426130, C358S426140

Reexamination Certificate

active

07450774

ABSTRACT:
An apparatus and a method of changing a bit rate of a compressed image bit stream by changing a codeword so as to easily change the bit rate and reduce a changing loss. The apparatus for changing a bit rate, in which an input bit stream generated by an image compression encoding method is changed into an output bit stream having a desired bit rate, includes a changing codeword determiner which selects codewords to replace the codewords of the input bit stream, and a codeword changer which changes the codewords of the input bit stream into the codewords selected by the changing codeword determiner. The method and the apparatus can be applied to image services provided through the Internet and receiving apparatuses supporting the Personal Video Recorder (PVR) function. Particularly, the method of changing the bit rate of a compressed image bit stream changes the codewords of input transform coefficients so as to easily change the bit rate and reduce the changing loss.

REFERENCES:
patent: 5604498 (1997-02-01), Park
patent: 5754235 (1998-05-01), Urano et al.
patent: 5812073 (1998-09-01), Lee et al.
patent: 5884269 (1999-03-01), Cellier et al.
patent: 6181711 (2001-01-01), Zhang et al.
patent: 6185339 (2001-02-01), Ozaki
patent: 6498865 (2002-12-01), Brailean et al.
patent: 6549671 (2003-04-01), Miyagoshi et al.
patent: 6771703 (2004-08-01), Oguz et al.
patent: 6829300 (2004-12-01), Ichioka
patent: 2002/0102027 (2002-08-01), Miyake et al.
Nakajima et al. (“Rate Conversion of MPEG Coded Video by Re-quantization Process,” IEEE Proc. 1995 ICIP, vol. III, Sep. 1995, pp. 408-411).
Recommendation ITU-T H.262 (1995E).

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