Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Patent
1995-06-19
1997-12-16
Tran, Thai
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
356111, 356112, H04N 592
Patent
active
056994745
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a decoding method for moving picture signals and a decoding apparatus therefor, which are adapted to reproducing and decoding coded digital moving picture signals recorded on a recording medium such as optical disc, hard disc or magnetic tape, etc., and more particularly to high speed reproduction.
BACKGROUND ART
Since moving picture data has extremely large quantity of information, it is required for recording/reproducing such moving picture data to use recording media having extremely high continuous transmission rate (speed). Moreover, it is required for transmitting such data to use a communication path having large transmission capacity. At present, in order to record digital video signals of the NTSC television system, VTR using magnetic tape having large tape width, or optical disc recording/reproducing apparatus using optical disc having diameter of about 30 cm is required.
On the contrary, attempts have been made to carry out long time recording of digital video signals onto compact recording media having small recording information quantity. To realize this, there have been proposed systems for efficiently encoding digital video signals to record the encoded signals onto a predetermined recording medium, and efficiently decoding the signals read out therefrom. As one of these systems, there is MPEG (Moving Picture Experts Group) system.
In this MPEG system, differences between picture frames of video signals are first taken to thereby reduce redundancy in the time axis direction. Further, orthogonal transform technique such as Discrete Cosine Transform (DCT), etc. is used to reduce redundancy in the spatial axis direction. In this way, video signals are efficiently encoded to record them onto a predetermined recording medium. Moreover, in the case of reproducing a recording medium on which efficiently coded video signals are recorded by such a method, signals read out from the recording medium are caused to undergo Inverse Discrete Cosine Transform to efficiently decode them, thus to reproduce video signals.
Since devices based on the above-mentioned MPEG system are already on the market as goods (products) and are well known in many publications, the detailed explanation is omitted. Syntax of the MPEG system will now be described. With respect to MPEG, at the time of filing of this application, higher quality standard content called MPEG 2 is being studied, and syntax described below is in the middle of establishment of standardization.
Tables shown in FIGS. 18 to 25 are tables in which syntax is defined. This syntax describes a procedure for permitting analysis of a predetermined bit stream when that bit stream is provided to restore (reconstruct) original signals. FIG. 18 defines video sequence, which is described by programmable language. Such video sequence can be read as flowchart. In addition, this syntax is described in a form such that at least men skilled in the art which study standard of MPEG can easily comprehend its technical contents.
FIG. 19 shows an example of sequence header. The sequence header serves to define the form of moving picture displayed, and, e.g., No. of scanning lines and aspect ratio, etc. are defined. Its example will be described below. size.sub.-- value) and MSB of 2 bits (horizontal.sub.-- size.sub.-- extension of sequence.sub.-- extension), and indicates displayable lateral width at luminance component of picture by 14 bits in total. size.sub.-- value) and MSB of 2 bits (vertical.sub.-- size.sub.-- extension of sequence-extension), and indicates displayable longitudinal width at luminance component of picture by 14 bits. is shown in FIG. 26. In the case where non.sub.-- interlaced.sub.-- sequence is 0 (interlaced picture), frame.sub.-- rate indicates No. of frames per one second. In the case where non.sub.-- interlaced.sub.-- sequence is 1 (progressive picture), frame.sub.-- rate indicates No. of progressive pictures per one second. LSB side indicating bit.sub.-- rate in sequence header and 12 bits of MSB side ind
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Fujinami Yasushi
Suzuki Teruhiko
Tahara Katsumi
Yagasaki Yoichi
Yonemitsu Jun
Frommer William S.
Nguyen Huy
Sinderbrand Alvin
Sony Corporation
Tran Thai
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