Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1998-12-28
2001-07-03
Garber, Wendy R. (Department: 2615)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000
Reexamination Certificate
active
06256451
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to apparatuses and methods of editing video data coded according to MPEG (Moving Picture Experts Group) standard.
Shown in
FIG. 1
is a method of editing MPEG video data coded by intraframe coding and interframe predictive coding to splice two bit streams of the MPEG video data of sequential GOPs (Group of Pictures).
The method shown in
FIG. 1
is to remove GOPs A
4
to B
3
and splice bit streams of GOPs A
3
and B
4
, so that continuance is achieved in view of GOP. However, the same value of VBV (Video Buffering Verifier) must be set for the GOPs to achieve continuance in view of VBV. Furthermore, the edition shown in
FIG. 1
requires re-encoding to have the same VBV delay for GOPs or closed GOPs in which amount of coded data is constant for each GOP for achieving continuance of VBV delay. This method is thus not capable of splicing bit streams in the midway of a GOP.
Such a method capable of editing bit streams in the midway of a GOP is shown in FIG.
2
. Shown in
FIG. 2
is to remove bit streams from in the midway of a GOP A
4
to the other midway of a GOP B
3
. The GOPs A
4
and B
3
each being split into two due to edition are decoded and coded again to form a GOP C.
This method has a drawback, that is, it causes deterioration of decoded pictures corresponding to re-encoded frames due to restriction on amount of codes for frames to be subjected to re-encoding.
In detail splicing two MPEG video data coded by interframe predictive coding, that is, just connecting two data frame by frame, causes pictures to go fuzzy. Furthermore, no continuance of VBV delay on the point of connection (edition) of video data causes overflow or underflow at a decoder input buffer, thus resulting in pictures going fuzzy or a halt on moving pictures. This would happen because the decoder input buffer compensates for variation of data amount per frame of input coded data.
SUMMARY OF THE INVENTION
A purpose of the present invention is to provide an apparatus and a method of editing video data of sequential GOPs coded according to MPEG standard that achieve high quality of edited pictures and prevent overflow or underflow at a decoder input buffer even if edition is made in the midway of a GOP.
The present invention provides an apparatus for editing input video data of sequential GOPs (Group of Pictures) coded according to MPEG (Moving Picture Experts Group) standard, wherein the edition is conducted at least at a first edition point and a second edition point of the input video data, the second edition point coming after the first edition point on time-axis. The apparatus is provided with a decoder, in the case where the first edition point is located in the midway of a first GOP, to decode at least a first data portion of the first GOP, the first data portion ranging from the head of the first GOP to the first edition point, and a first entire data of a second GOP followed by the first GOP, while in the case where the second edition point is located in the midway of a third GOP that comes after the first GOP on the time-axis, to decode at least a second data portion of the third GOP, the second data portion ranging from the second edition point to the end of the third GOP, and a second entire data of a fourth GOP that follows the third GOP, the sequential GOPs being constituted by at least the first, second, third and fourth GOPs. The apparatus further includes an encoder to encode the decoded first entire data and first data portion, and the decoded second data portion and second entire data, thus forming a fifth GOP and a sixth GOP, respectively, the sixth GOP following the fifth GOP. The apparatus also includes means for putting the fifth and sixth GOPs into the sequential GOPs, thus a data portion, of the input video data, that ranges from the first edition point to the second edition point, being removed from the input video data.
Furthermore, the present invention provides a method of editing input video data of sequential GOPs (Group of Pictures) coded according to MPEG (Moving Picture Experts Group) standard, wherein the edition is conducted at least at a first edition point and a second edition point of the input video data, the second edition point coming after the first edition point on time-axis. In the case where the first edition point is located in the midway of a first GOP, decoded are at least a first data portion of the first GOP, the first data portion ranging from the head of the first GOP to the first edition point, and a first entire data of a second GOP followed by the first GOP. On the other hand, in the case where the second edition point is located in the midway of a third GOP that comes after the first GOP on the time-axis, decoded are at least a second data portion of the third GOP, the second data portion ranging from the second edition point to the end of the third GOP, and a second entire data of a fourth GOP that follows the third GOP, the sequential GOPs being constituted by at least the first, second, third and fourth GOPs. The decoded first entire data and first data portion, and the decoded second data portion and second entire data are encoded to form a fifth GOP and a sixth GOP, respectively, the sixth GOP following the fifth GOP. The fifth and sixth GOPs are put into the sequential GOPs, thus a data portion, of the input video data, that ranges from the first edition point to the second edition point, being removed from the input video data.
REFERENCES:
patent: 5793431 (1998-08-01), Blanchard
patent: 5917830 (1999-06-01), Chen et al.
patent: 5959690 (1999-09-01), Toebes, VIII et al.
patent: 6137834 (2000-10-01), Wine et al.
patent: 8-37640 (1996-02-01), None
Garber Wendy R.
Jacobson & Holman PLLC
Onuaku Christopher
Victor Company of Japan Ltd.
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