Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Reexamination Certificate
1999-11-02
2002-09-17
Kelley, Chris (Department: 2613)
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
C348S441000, C382S235000
Reexamination Certificate
active
06452973
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a system and method for converting heterogeneous compressed moving picture data and, more particularly, to a system and method for converting H.261 compressed moving picture data to moving picture expert group-1 (MPEG-1) compressed moving picture data on a compression domain.
DESCRIPTION OF THE PRIOR ART
Recently, an information communication technique has been developed to a stage capable of providing various multimedia communication services together with the realization of a superhighway information communication network. A principal technique, required for these services, is that a service system compresses moving picture data without losing the moving picture data and transmits the compressed moving picture data via a limited frequency band.
Further, a moving picture compression technique has been developed and standardized to various types. The various types include H.261 and H.263 standardized by telecommunication standardization sector of international telecommunication union (ITU-T), and moving picture expert group-1 (MPEG-1) and moving picture expert group-2 (MPEG-2) standardized by international organization for standardization/international electrotechnical commission (ISO/IEC). The moving picture compression standard has an effect on multimedia communication terminal standard such as H.310, H.320, H.321, H.322, H.323, H.324 and so on.
When origination and destination communication terminals employ media compression standard different from each other, the origination communication terminal should convert the media compression standard of the origination communication terminal to that of the destination communication terminal. Accordingly, a heterogeneous media format should be supported to multimedia communication terminals based on standard different from each other so that the interface between the multimedia communication terminals is efficiently accomplished.
Referring to
FIG. 1
, there is shown a conventional system for converting an H.261 data bit stream to an MPEG-1 data bit stream on a pixel domain. The conventional system includes an H.261 moving picture decoding apparatus
11
and an MPEG-1 moving picture encoding apparatus
12
.
The H.261 moving picture decoding apparatus
11
decodes the H.261 data bit stream to obtain decoded digital signals on the pixel domain. The H.261 moving picture decoding apparatus
11
includes a variable length decoder
111
, an inverse quantizer
112
, an inverse discrete cosine transform (DCT) processor
113
and a motion compensator
114
.
The MPEG-1 moving picture encoding apparatus
12
encodes the decoded H.261 data bit stream into the MPEG-1 data bit stream. The MPEG-1 moving picture encoding apparatus
12
includes a motion estimator
121
, a DCT processor
122
, a quantizer
123
and a variable length encoder
124
.
Since the conventional system needs the H.261 moving picture decoding apparatus
11
and the MPEG-1 moving picture encoding apparatus
12
, there is a problem that a system structure and processing is complicated.
Further, an H.261 data bit stream is converted to an MPEG-1 data bit stream on a pixel domain, not a compression domain, so that the quality of a moving picture is degraded and the system processing speed is delayed.
Accordingly, the conventional system may not be employed in an interactive multimedia communication such as a video phone and a video conference because of the complicated system structure, the quality degradation of the moving picture and the delayed system processing speed.
SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to provide a system for converting H.261 compressed moving picture data to moving picture expert group-1 (MPEG-1) compressed moving picture data on a compression domain.
It is another object of the present invention to provide a method for converting H.261 compressed moving picture data to moving picture expert group-1 (MPEG-1) compressed moving picture data on a compression domain.
It is further another object of the present invention to provide a computer-readable medium that performs a method for converting H.261 compressed moving picture data to moving picture expert group-1 (MPEG-1) compressed moving picture data on a compression domain.
In accordance with an aspect of the present invention, there is provided a system for converting a heterogeneous compressed moving picture data, comprising: a variable length decoder for generating variable length decoded data as first compressed moving picture data from a first data bit stream; a compressed moving picture data analyzer for analyzing layer types of the first compressed moving picture data; a layer-matching device for matching layers of the first compressed moving picture data to layers of second compressed moving picture data, thereby generating the second compressed moving picture data; and a variable length encoder for generating variable length coded data as a second data bit stream.
In accordance with another aspect of the present invention, there is provided a method for converting a heterogeneous compressed moving picture, comprising the steps of: a) generating variable length decoded data as first compressed moving picture data from a first data bit stream; b) analyzing layer types of the first compressed moving picture data; c) matching layers of the first compressed moving picture data to layers of second compressed moving picture data, thereby generating the second compressed moving picture data; and d) generating variable length coded data as a second data bit stream.
In accordance with further another aspect of the present invention, there is provided a computer-readable medium for performing the steps of: a) generating variable length decoded data as first compressed moving picture data from a first data bit stream; b) analyzing layer types of the first compressed moving picture data; c) matching layers of the first compressed moving picture data to layers of second compressed moving picture data, thereby generating the second compressed moving picture data; and d) generating variable length coded data as a second data bit stream.
REFERENCES:
patent: 5408274 (1995-04-01), Chang et al.
patent: 5537440 (1996-07-01), Eyuboglu
patent: 5657015 (1997-08-01), Nakajima
patent: 5708732 (1998-01-01), Merhav et al.
patent: 6058122 (2000-05-01), Hwang
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“Transcoding GIF Images to JPEG-LS” by N. Memon and R. Rodila, IEEE Transactions on Consumer Electronics, vol. 43, No. 3, Aug. 1997, pp. 424-429.
“Manipulation and Compositing of MC-DCT Compressed Video” by Shih-Fu Chang, IEEE Journal on Selected Areas in Communications, vol. 13, No. 1, Jan. 1995, pp. 474-476.
“An Efficient JPEG to MPEG-1 Transcoding Algorithm” by Ja-Ling Wu et al., IEEE Transactions on Consumer Electronics, vol. 42, No. 3, Aug. 1996, pp. 447-457.
“Fast Algorithms for DCT-Domain Image Down-Sampling and for Inverse Motion Compensation” by Neri Merhav et al., IEEE Transactions on Circuits and Systems for Video Technology, vol. 7, No. 3, Jun. 1997, pp. 468-475.
Antonelli Terry Stout & Kraus LLP
Electronics and Telecommunications Research Institute
Kelley Chris
Parsons Charles
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