JPH06268969A - Skipping reproduction method for moving image information highly efficiently encoded by mpeg system - Google Patents

Abstract

PURPOSE:To easily provide moving images whose motion is smooth. CONSTITUTION:The head of a sequence header to be added to moving image information highly efficiently encoded by an MPEG system where an I frame, a P frame and a B frame highly efficiently encoded by the MPEG system coexist is positioned at the head in a sector beforehand and the detection of the I frame is made possible to be performed in a short time. Also, when the sector provided at least with a time stamp PTS appears after the I frame appears, the image data of the sector provided at least with the time stamp PTS until end are supplied to MPEG decoders 6 and 7. Thus, the seake operation of an optical head can be performed while the MPEG decoders 6 and 7 perform a decoding operation, the time required for detecting the succeeding I frames can be shortened, the number of images reproducable per unit time is increased and the motion of the moving images reproduced in a skip reproduction method mode can be smoothed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reproducing method for reproducing moving image information coded with high efficiency by the MPEG system in an interlaced reproducing mode.

[0002]

2. Description of the Related Art Video signals of moving images are highly efficiently compressed and transmitted,
Research for recording and reproducing has been actively conducted, and for example, recording of image data of a highly efficient compressed moving image on a small disk has also been attempted.
With the aim of creating an international standard for compressing image data by high-efficiency encoding video image signals, MPEG
(Moving Picture Coding Grou
p) sequentially proposes various data formats relating to highly efficient compressed image data, and image data highly efficiently compressed according to the data format proposed by MPEG (compressed image signal highly efficiently compressed by the MPEG system). Research and development has also been conducted on a practical device for transmitting, recording, and reproducing.

A moving picture information coding system (MPEG system) intended for a recording medium for recording digital data such as a CD-ROM employs a predictive coding method. An image in which image data is compressed by applying the inner prediction method {I picture (I
The image data is compressed by applying an inter-frame prediction method in which inter-frame prediction is performed based on image data of a frame (hereinafter, also referred to as an I frame) and image data of a past frame. Image {P picture (Predicted Pi
frames) (hereinafter also referred to as P-frames) and inter-frame prediction based on image data of both past frame image data and future frame image data Image whose image data has been compressed by applying the method {B picture (Bi-directional Pred
motion pictures) frame (hereinafter referred to as B
(Although it may be called a frame), each frame in three types of image modes is arranged in a predetermined arrangement on the time axis, and a predetermined header is added to the digital data to obtain image encoded data. .

In the MPEG system, the relationship between the image data compression rate in the I frame, the image data compression rate in the P frame, and the image data compression rate in the B frame is as follows. Compression rate) <(compression rate of image data in P frame) <(compression rate of image data in B frame)
The relationship is such that the reproduction is performed from the sequence header of the entry point at the time of reproduction, and the prediction is performed using the past image information and the image information of the future frame. In order to reproduce the image information of the B frame, the image information of the future P frame used for predicting the image information of the B frame needs to be recorded before the B frame.

Reproduction of an image from moving image information highly efficient coded by the above-mentioned MPEG system, in addition to a normal reproduction mode, a slow reproduction mode, a still image reproduction mode, a frame advance reproduction mode, an interlaced reproduction mode. This is performed in various reproduction modes such as (scan reproduction mode). By the way, the moving image information which is highly efficient coded by the MPEG system is reproduced in the interlaced reproduction mode, and the reproduced images which are successively thinned out are obtained from the moving image information which is highly efficiently coded by the MPEG system. In such a case, only the I frames immediately preceding the sequence header and GOP header are reproduced one after another. And conventionally, M
From moving image information that is highly efficient encoded by the PEG method,
To obtain replayed images that have been decimated one after another,
The MPEG video decoder continues to supply the bit stream, and the MPEG video decoder detects the sequence header in the supplied bit stream as described above and decodes the image information of the subsequent I frame,
When the MPEG video decoder finishes the decoding operation for the image information of the one I-frame, it informs the central processing unit that the next sequence header is considered to exist in the central processing unit. Was searched, the bit stream was stolen from there, and the above-described operation of returning to step was repeated to decode the next I frame.

[0006]

By the way, in order for the image reproducing apparatus to perform moving image information in the interlaced reproducing mode,
When the operator makes an input to the operation section for operating the image reproducing device in the jump reproduction mode, the disk drive device having the optical head is instructed to perform the seek operation in the optical head according to an instruction from the central processing unit. Then, the data read by the optical head is temporarily stored in the buffer memory, the stored data is read from the buffer memory, and the bit stream is continuously supplied to the MPEG video decoder. The entire bitstream that has been created is detected, the I frame is detected from the entire bitstream, the image information is decoded, and the MP
When the EG video decoder completes the decoding operation for the image information of one I frame, the EG video decoder notifies the central processing unit of the decoding operation, and the central processing unit determines the next I processing.
The disk drive device is instructed to seek the optical head to a position where a frame is considered to exist. However, when the above-described reproduction operation is performed and the interlaced reproduction is performed, the optical head is In addition to the time required for the seek operation and the time until the servo operation enters a normal operation, the MPEG video decoder detects an I frame, and the image information of the I frame is decoded and decoded. After the end of the operation, a lot of time is spent because the next seek operation is being performed.

When the moving picture information coded with high efficiency by the MPEG system is reproduced in the interlaced reproduction mode, MPE is used.
Since only the I frames in which the image data is compressed by applying the intra-frame prediction method are reproduced one after another from the moving image information which is highly efficiently encoded by the G method,
For example, if the central processing unit performs the sequence header detection operation by observing the entire bitstream, it is considered that the sequence header can be detected in a short time if the sequence header is detected.
Since the central processing unit operates for many kinds of signal processing, if the central processing unit looks at all of the bit stream and performs the sequence header detection operation, it is extremely huge. Since it takes a long time, the sequence header detecting operation described above is conventionally performed by the MPEG video decoder. As described above, since a large amount of wasted time is required for the above-described sequence header detection operation, it takes a long time until an image of the next I frame is obtained, which results in a unit time during interlaced reproduction. Since the number of images per hit becomes small, the smoothness of the motion of the reproduced image becomes insufficient, and therefore an improvement measure has been demanded.

[0008]

According to the present invention, an image frame in which image data is compressed by applying the intra-frame prediction method and an image in which image data is compressed by applying inter-frame prediction are used. MPE with mixed frames
In the case of sequentially reproducing only the images of the image frames in which the image data is compressed by applying the intra-frame prediction method from the moving image information which is highly efficiently encoded by the G method,
Jumping of moving image information highly encoded by the MPEG method, characterized in that the beginning of a sequence header added to moving image information highly encoded by the MPEG method in advance is located at the beginning of a sector. How to play,
And an image frame in which image data is compressed by applying the intra-frame prediction method and an image frame in which image data is compressed by applying inter-frame prediction are mixed. When the sector having at least the time stamp PTS appears after the I frame appears during the interlaced reproduction of the efficiency coded moving image information, the image data up to the end of at least the sector having the time stamp PTS. The present invention provides an interlaced reproduction method of moving picture information which is highly efficient coded by the MPEG system so as to be supplied to an MPEG decoder.

[0009]

An MPEG system in which an image frame whose image data is compressed by applying the intra-frame prediction method and an image frame whose image data is compressed by applying the inter-frame prediction are mixed. By arranging the head of the sequence header added to the moving image information coded with high efficiency by the head at the head of the sector, the I frame can be detected in a short time, and the time stamp DTS and time When a frame having both the stamp PTS appears twice in succession, image data up to the end of the sector in which the second frame having both the time stamp DTS and the time stamp PTS appears. Supply it to the MPEG decoder,
Since the seek operation of the optical head can be performed from the time when the MPEG decoder is performing the decoding operation, the time required to detect the next I frame can be shortened. Therefore, the number of images that can be reproduced per unit time Can be easily increased, and the motion of the moving image reproduced in the interlaced reproduction method mode can be made smooth.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The MPEG of the present invention will be described below with reference to the accompanying drawings.
The specific content of the interlaced reproduction method of moving image information highly efficient coded by the method will be described in detail. FIG. 1 is a block diagram showing a schematic configuration of a reproducing apparatus to which an interlaced reproducing method of moving image information highly efficient coded by the MPEG system of the present invention is applied, and FIGS. 2 to 4 show the present invention. MPE
FIG. 6 is a data layout diagram for explaining an interlaced reproduction method of moving image information that has been highly efficiently encoded by the G method. In the reproducing apparatus shown in FIG. 1, 1 is a reproduction signal source, 2 is an interface, 3 is a buffer manager, 4 is a central processing unit, 5 is a buffer memory, 6 is an MPEG video decoder, and 7 is an MPEG audio decoder.

In the reproducing apparatus shown in FIG. 1, the reproducing signal source 1 applies at least an image frame (I frame) in which image data is compressed by applying the intra-frame prediction method and inter-frame prediction. And time-series data including high-efficiency-coded moving image information and audio information data by the MPEG method in which image frames (P frames, B frames) in which image data is compressed are mixed. A data stream (bit stream) with a predetermined header that includes at least information on the type of each of the above-mentioned information, video information or audio information, and time information (time stamp) for each information. The data read from the information recording medium on which the data string to be reproduced in the recorded state is recorded, for example, an optical disc, a magneto-optical disc, or another recording medium. A structure that can send out a data train is used. In the following description, the reproduction signal source 1 is used for the highly efficient compressed audio information and MPEG.
It is said that the reproduction data can be output from an optical disc conforming to the CD (Compact Disc) standard in which moving image information highly efficiently compressed by the method is recorded.

A time-series bit stream containing data of audio information and high-efficiency-encoded moving image information according to the MPEG system in which the I frame, P frame, and B frame are mixed. Of the header of the data string to be reproduced in the state in which the predetermined header is added as described later, which is configured to include at least the information of each information type and the time information of each information. The part is information indicating the type of each information such as acoustic information, image information, and other information, and time information for each information,
It is configured to include various kinds of information such as a sector number, and various kinds of data such as the audio information data, the image information data, and other data form a bit stream. In the reproduction signal source 1 described above, under the control of the control signal provided from the central processing unit 4 via the transmission line 8 and the interface 2, for example, a data string reproduced from an optical disk, that is, at least data of acoustic information. Data to be reproduced in a state in which a header is added to a bit stream including data of image information and at least information of the type of each information and time information of each information. Row (playback data row)
Is transmitted to the transmission line 9.

The reproduced data string sent to the transmission line 9 as described above is stored in the buffer memory 5 via the interface 2 and the buffer manager 3. The buffer manager 3 is controlled by a control signal supplied from the central processing unit 4 via the bus 10 and is reproduced from the reproduction signal source 1 to the transmission line 9 and the interface 2.
The reproduction data transmitted via the buffer memory 5 is sequentially written in the buffer memory 5, or the audio information data in the reproduction data string stored in the buffer memory 5 is read out and is transmitted via the bus 11. To supply to the MPEG audio decoder 7 or to read the image information data in the reproduction data sequence stored in the buffer memory 5 and supply it to the MPEG video decoder 7 via the bus 12. Each has a function that can be performed in real time.

When the reproducing apparatus is operating in the normal reproducing mode, the central processing unit 4 operates according to the program stored in the memory 13,
Information of the type of information included in the header part of the reproduction data string stored in the buffer memory 5 via the buffer manager 3 and time information of each information, that is, whether the data is acoustic information data or image information. In order to distinguish between the data and the information such as the reproduction time of the acoustic information and the image information, in response to the request from each MPEG decoder (6, 7) corresponding to each data, the buffer memory 5 is stored. Data for each type of information in the stored reproduction data is transferred via the buffer manager 3. The above-mentioned requests from the respective MPEG decoders (6, 7) are issued at timings such that the reproduction state is continuous, and the data is transferred accordingly, so that the reproduction signal continues on the time axis. The sex will be guaranteed by each MPEG decoder (6, 7). It should be noted that the MPEG decoder (6, 7) is provided with a means for starting the reproduction at a predetermined time at this time because the reproduction is discontinuous with the reproduction from the non-reproduction at the start. As a means for starting the reproduction at the above-mentioned predetermined time, the MPE from the central processing unit 4 via the bus 10 is used.
The data which is configured to be commanded to the G decoder (6, 7) and which includes the time stamp is transferred to the bus 1
1 or an MPEG decoder (6
7) and various MPEG decoders (6, 7) can start reproduction at a predetermined time based on the data including the time stamp.

As described above, when the audio information data is transferred from the buffer memory 5 to the MPEG audio decoder 7 through the buffer manager 3 and the bus 11 under the control of the buffer manager 3, the MPEG audio decoder 7 receives the audio information data. The reproduced acoustic information signal obtained by decompressing the acoustic information data obtained by compressing the acoustic information signal supplied thereto is output, and the buffer memory 5 and the buffer manager 3 and the bus 12 are controlled by the buffer manager 3. The image information data is transferred to the MPEG video decoder 7 via
Then, the MPEG video decoder 7 outputs the reproduced image information signal obtained by decoding the image information data obtained by compressing the image information signal supplied thereto. Therefore, the reproduced audio information signal is continuously output on the time axis from the MPEG audio decoder 7, and the image information signal is continuously output on the time axis from the MPEG video decoder 7. Output

Next, when the operator inputs an operation section (not shown) for operating the reproducing apparatus in the interlaced reproducing mode, the reproducing apparatus operates in the interlaced reproducing mode and the reproducing apparatus operates. From the MPEG video decoder 6, only the sequential image information corresponding to the image frame I frame in which the image data is compressed by applying the intra-frame prediction method is output. With reference to FIG. 2 and the following figures, the configuration principle and operation principle of the interlaced reproduction method of moving image information highly efficient coded by the MPEG system of the present invention will be described. Figure 2 is MPE
The moving image information compressed by the G method with high efficiency is recorded on a CD.
FIG. 3B is a diagram for explaining the arrangement of data relating to highly efficient compressed moving image information when recording on an optical disc conforming to the (Compact Disc) standard. FIG. 2B shows the CD (Compact Disc) standard. 3 shows an arrangement state of recording data in a sequential sector portion in which data relating to moving image information compressed with high efficiency is recorded on the optical disc according to FIG.

In addition, in FIG. 2A, the contents of data to be sequentially recorded are shown after the portion of the MPEG system header in each sector shown in FIG. One GOP (Group of Pictures) is illustrated. The GOP has a sequence header placed at its head, a GOP header placed after the sequence header, and a GOP header placed after the GOP header.
It is configured such that sequential image frames are arranged. The above-mentioned sequence header is composed of a horizontal size and a vertical size of an image, information of an aspect ratio, and various other information in addition to the sequence header code. The GOP header is a GOP (Group). of Pictu
res), the group start code, the time code, the information indicating whether or not it is a closed GOP, the broken link, other information, and the like, which are arranged prior to the leading part of the res).

The GOP is composed of an I-frame image data, a P-frame image data, and a B-frame image data group.
Immediately after the P header, the image data of the I frame is always located. Further, in the closed GOP, a GOP having an array of image information such as GOP header → I frame image information → P frame image information → ...
OP, GOP header → I frame image information → B
A GOP having an image information array such as frame image information → ... is closed G in this specification.
We will use the term GOP instead of OP. 2C to 2F show specific contents of the MPEG system header shown in FIG. 2B. PTS and DTS in the figure are time stamps. Yes, the above two types of time stamps PT
One of the S and DTS time stamps PTS (prese
ntation time stamp) is information indicating the time when the image is actually displayed, and the other time stamp DTS.
(Decoding time stamp) is time information indicating the time at which data is sent to the MPEG video decoder.

There are many kinds of concrete contents of the MPEG system header as shown in FIGS. 2 (c) to 2 (f) because the time stamp included in the MPEG system header is included. This is because it is possible to indicate the content of the image information recorded in the sector in which the MPEG system header exists, the recording mode, etc. by distinguishing the presence or absence and the type of time stamp. The specific contents of the system header are shown in Fig. 2.
If two types of time stamps PTS and DTS are present in the MPEG system header as shown in (c) and (d), the sector in which the MPEG system header is placed 2 means that the encoded I frame or P frame starts, and in particular, the MPEG system header having the content as shown in FIG. 2C is shown in FIG. A plurality of GOPs as illustrated is placed in the first sector of each video sequence in the series.

When only the time stamp PTS exists in the MPEG system header as shown in FIG. 2 (e), the encoded B frame is included in the sector in which the MPEG system header is placed. 2 has started, and as shown in (f) of FIG.
If neither of the time stamps PTS and DTS exists in the system header, the I frame, P, and P are stored in the sector in which the MPEG system header is placed.
This means that it does not include the boundary of the beginning of any image frame of the frame and the B frame.

As is apparent from what has been described so far with reference to FIG. 2, in an optical disc conforming to the CD (Compact Disc) standard, sequential data recording data relating to highly efficient compressed moving image information is recorded. As can be seen from the description content of the arrangement of the recording data in the sector portion, it is also permitted that the I frame starts in the middle of the sector, so that the MPEG
A high-efficiency-coded moving picture information is recorded in the interlaced reproduction mode on an optical disc in which the moving picture information is recorded according to the above-mentioned conventional method, and the moving picture information is highly-encoded by the MPEG method. When it is desired to obtain a reproduced image in a thinned state, the MPEG video decoder detects an I frame and decodes the image information of the I frame, and after the decoding operation is completed,
Since the next seek operation is performed, a lot of time is spent, and it takes a long time until the image of the next I frame is obtained, which results in the number of images per unit time during the interlaced reproduction. As a result, the smoothness of the motion of the reproduced image became insufficient.

Therefore, in the interlaced reproduction method of moving image information highly efficient coded by the MPEG method of the present invention, an image frame in which image data is compressed by applying the intra-frame prediction method and an inter-frame The image data is compressed by applying the intra-frame prediction method from the moving image information that is highly efficient coded by the MPEG method in which the image frame in which the image data is compressed by applying the prediction is mixed. When only the images of the image frames that are displayed are sequentially reproduced, the beginning of the sequence header added to the moving image information of the I frame in advance may be positioned at the beginning of the sector, or the intra-frame prediction method may be used. An image frame in which image data is compressed by applying it, and an image frame in which image data is compressed by applying inter-frame prediction At the time of interlaced reproduction of high-efficiency coded moving image information by the mixed MPEG system, at least a time stamp PTS is provided when a sector having at least a time stamp PTS appears after an I frame appears. By supplying the image data up to the end of the present sector to the MPEG decoder and shortening the detection time of the sequential I frames, the number of images per unit time during the interlaced reproduction is increased, and the motion is smooth. The reproduced image was easily obtained.

FIG. 3 shows an I frame in which image data is compressed by applying the intra-frame prediction method and a P frame, a B frame, etc. in which image data is compressed by applying inter-frame prediction. In order to make it possible to easily detect an I frame from a bitstream in which various image frames are mixed, the playback device uses an interlaced playback mode in moving image information that has been highly efficient coded in advance by the MPEG method. FIG. 9 is a data layout diagram showing a state in which there is only one I frame to be used when the time is set for a sequential GOP. MP already described with reference to FIG.
As is clear from the description of the EG method, each GOP
The tip of the sequence header added immediately before is
Always the top of the sector (C placed at the top of the sector
(The portion following the D header and the MPEG system header), and in the first sector of each video sequence in which a plurality of GOPs as illustrated in FIG. MPEG
The system header has the contents as shown in FIG. 2C, and the image frame following the GOP header is necessarily an I frame, so that the playback device performs the interlaced playback mode as described above. If there is only one I-frame to be used for each sequential GOP, the beginning of the sequence header added to the moving picture information of the I-frame will be located at the beginning of the sector. In order to detect the I frame to be used when the reproducing apparatus is set to the interlaced reproducing mode as described above, it suffices only to see whether or not the MPEG system header in the sequential sector exists. Can be easily detected in a short time.

Next, when the reproducing apparatus is set to the interlaced reproduction mode, the I-frame is a sequential I-frame, and the decoding operation of the image data in the MPEG video decoder only needs the I-frame image data. , The GOP containing the image data targeted for playback is a closed GOP
, The data arrangement is such that I frame → P frame → B frame ... Therefore, the time stamps present in the MPEG system header are PTS and DTS in the sector in which the I frame appears, and I In the sector including the end part of the frame and the start part of the P frame, they are PTS and DTS. Therefore, when the time stamps PTS and DTS appear for the second time as described above, the image data up to the end of the sector where the time stamps PTS and DTS appear for the second time are supplied to the MPEG decoder. Thus, the detected I-frame image data can be supplied to at least the MPEG decoder.

If the GOP containing the image data to be reproduced is a GOP that is not a closed GOP, the data arrangement is usually I frame → B frame ... The time stamp existing in the system header is PTS, DTS in the sector in which the I frame appears, and PTS in the sector including the end portion of the I frame and the start portion of the B frame. Therefore, when the time stamp PTS appears after the time stamps PTS and DTS appear as described above, the image data up to the end of the sector in which the time stamp PTS appears may be supplied to the MPEG decoder. In this case, the detected I-frame image data can be supplied to at least the MPEG decoder. That is, during the interlaced reproduction of the high-efficiency-coded moving image information in which the I frame, the P frame, and the B frame are mixed, a sector having at least the time stamp PTS appears after the I frame appears. If at least the time stamp PT
MPE image data up to the end of the sector with S
By supplying the I-frame image data to the G-decoder, all the I-frame image data can be supplied to the MPEG decoder.

[0026]

As is apparent from the above detailed description, the interlaced reproduction method for moving picture information coded with high efficiency by the MPEG method of the present invention applies the intra-frame prediction method to reproduce the image data. Sequence added to high-efficiency-coded moving image information by the MPEG system in which image frames compressed are mixed with image frames compressed image data by applying inter-frame prediction By locating the beginning of the header at the beginning of the sector in advance, the I frame can be detected in a short time, and after the I frame appears, at least the sector having the time stamp PTS appears. In this case, the image data up to the end of the sector having at least the time stamp PTS is supplied to the MPEG decoder. In this way, since the seek operation of the optical head can be performed within the time when the MPEG decoder is performing the decoding operation, the time required to detect the I frames one after another can be shortened. This makes it easy to increase the number of images that can be played back, and makes it possible to smooth the motion of moving images played back in the interlaced playback method mode. The point can be solved well.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a reproducing apparatus to which an interlaced reproducing method of moving image information highly efficient coded by the MPEG system of the present invention is applied.

FIG. 2 is a data layout diagram for explaining an interlaced reproduction method of moving image information which is highly efficiently encoded by the MPEG system of the present invention.

FIG. 3 is a data layout diagram for explaining an interlaced reproduction method of moving image information highly efficient coded by the MPEG system of the present invention.

[Explanation of symbols]

1 ... Playback signal source, 2 ... Interface, 3 ... Buffer manager, 4 ... Central processing unit, 5 ... Buffer memory, 6 ... MPEG video decoder, 7 ... MPEG audio decoder,

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[Procedure amendment]

[Submission date] October 8, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The MPEG of the present invention will be described below with reference to the accompanying drawings.
The specific content of the interlaced reproduction method of moving image information highly efficient coded by the method will be described in detail. FIG. 1 is a block diagram showing a schematic configuration of a reproducing apparatus to which an interlaced reproducing method of moving image information highly efficient coded by the MPEG system of the present invention is applied, and FIGS. 2 and 3 show the present invention. MPE
FIG. 6 is a data layout diagram for explaining an interlaced reproduction method of moving image information that has been highly efficiently encoded by the G method. In the reproducing apparatus shown in FIG. 1, 1 is a reproduction signal source, 2 is an interface, 3 is a buffer manager, 4 is a central processing unit, 5 is a buffer memory, 6 is an MPEG video decoder, and 7 is an MPEG audio decoder.

Claims (2)

[Claims] 1. An image frame in which image data is compressed by applying an intra-frame prediction method and an image frame in which image data is compressed by applying inter-frame prediction are mixed. When only the images of the image frames in which the image data is compressed by applying the intra-frame prediction method are sequentially reproduced from the moving image information that has been encoded by the MPEG system with high efficiency, the high efficiency can be obtained in advance by the MPEG system. An interlaced reproduction method for moving image information highly efficient coded by the MPEG system, characterized in that the beginning of a sequence header added to encoded moving image information is located at the beginning of a sector. 2. An image frame in which image data is compressed by applying the intra-frame prediction method and an image frame in which image data is compressed by applying inter-frame prediction are mixed. At the time of interlaced reproduction of high-efficiency-coded moving image information by the MPEG method, if a sector having at least the time stamp PTS appears after the I frame appears, at least the end of the sector having the time stamp PTS ends. Image data up to M
An interlaced reproduction method of moving image information highly efficient encoded by the MPEG system so as to be supplied to a PEG decoder.