Television – Special applications – Simulator
Patent
1996-04-15
1998-11-17
Trammell, James P.
Television
Special applications
Simulator
39520066, 348404, 348412, 348415, 348715, 386109, 386111, 386112, H04N 748, H04N 750
Patent
active
058389253
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a compressed picture data transmission method and a compressed picture data transmission apparatus for carrying out a plurality of series of compressed picture data.
BACKGROUND ART
In order to efficiently carry out compression of picture data, there has been employed a method of allowing pictures (pictorial images) of respective frames to be any one of three kinds of pictures: an I picture (Intra-coded Picture), a P picture (Predictive coded Picture) or B picture (Bidirectionally predictive coded Picture) where frame pictures are combined of these three pictures to compression-encode picture data. Data of an I picture is picture data compressed only by frame picture which is subject to encoding (hereinafter referred to as a corresponding frame picture depending upon circumstances), data of P picture is picture data compressed on the basis of a corresponding frame picture and frame picture of an I picture earlier than the corresponding frame picture and nearest thereto, and data of a B picture is picture data compressed on the basis of pictures of three frames in the total of corresponding frame picture, and frame pictures of I picture or P picture before and after the corresponding frame picture and respectively nearest thereto.
For example, in the case where a data train which has been encoded as shown in FIG. 1 is caused to undergo transmission in frame units, compressed picture (pictorial image) data is caused to be a data train as indicated by the series A of FIG. 2A. In the case where a data train is obtained by compressing data of a picture (pictorial image) different from the picture indicated by the data train of the series A which is now assumed to be series B as shown in FIG. 2B, and the series A and the series B are caused to undergo frame synchronization to carry out switching from the series A to the series B at the switching point P of the fourth frame, the data train of the series C as shown in FIG. 2C is obtained.
Meanwhile, since frame picture P.sub.B-4 immediately after the switching point P within the series C shown in FIG. 2C cannot be correctly decoded when decoding is implemented and because frame picture I.sub.B-2 when picture data is encoded is missing. Moreover, since frame picture B.sub.B-5 subsequent to the frame picture P.sub.B-4 is decoded by using frame picture P.sub.B-4 in which decode error (error in decoding) has taken place, decode error will also take place in this case. Although the way of generation of decode error changes by phase and switching point between two series, in the case where switching between two series is carried out at a predetermined switching point as described above, occurrence of the decode error cannot be avoided. Ordinarily, decoding is implemented to compress picture data to carry out switching in the area of the decoded picture signal. In this case, however, since decoding and encoding are repeated, picture quality is increasingly deteriorated in every repetition. In addition, the hardware configuration needed becomes large.
In view of actual circumstances as described above, this invention contemplates providing a compressed picture data transmission method and a compressed picture data transmission apparatus which can carry out switching between the data trains of the plural series without allowing the picture quality to be deteriorated.
DISCLOSURE OF THE INVENTION
In order to solve the above-described problems, a compressed picture data transmission method according to this invention is characterized in that, in carrying out every frame, transmission of picture data is compressed by using frame correlation (hereinafter referred to as compressed picture data). The compressed picture data necessary for decoding compressed picture data that is caused to undergo transmission (or transmitted) every frame and is caused to undergo transmission at the same time within the same frame as that of the compressed picture data caused to undergo transmission every frame.
Moreover, the compressed picture data t
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Frommer William S.
Nguyen Cuong H.
Sony Corporation
Trammell James P.
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