JP3281742B2 - Disc player - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc player such as a video compact disc (video CD) player or a digital video disc (DVD) player, and more particularly, to slow motion reproduction on a disc on which slow motion video information is not recorded. At times, the present invention relates to a disc player in which a newly created additional picture is inserted between each of I, P, and B pictures read from a disc to obtain a slow motion display image of continuous motion.

[0002]

2. Description of the Related Art Recently, disc players, especially,
12cm in diameter in the field of video CD players
Up to 74 CDs with CD-ROM format
A video CD in which compressed digital image data and compressed digital audio data are recorded in a time-division manner has been developed, and a video CD player for reproducing the compressed digital data recorded on the video CD has also been developed.

The outline of this known video CD will be described with reference to the drawings.

First, FIG. 4 is an explanatory diagram showing a disk configuration of such a video CD.

[0005] As shown in FIG.
Lead-in area (LIN) and track 1 (TR1)
And tracks 2 (TR2) to N (TRN)
And a lead-out area (LOUT). Here, the lead-in area (LIN) includes various T
This is an area where OC information is recorded.
(TR1) is an area in which a file management information section (PVD) compliant with ISO9660, a karaoke information section, a video CD information section, a segment play item section, and a CD-I application section are sequentially recorded. Tracks 2 (TR2) to N (TRN) are all MPEG1 (Moving Pictu
re Experts Group 1) This is an area in which compressed digital image data and compressed digital audio data are recorded according to the method, and a lead-out area (L)
OUT) is an area in which information indicating the end of recording of various data is recorded.

FIG. 5 is an explanatory diagram showing the structure of tracks and sectors in such a video CD.
(A) shows a track configuration, and (b) shows a sector configuration.

As shown in FIG. 5A, each track (for example, track number n, where n =
2, 3,..., N) are provided with a pause margin (150 sectors or more) for searching by track number at the beginning, followed by a front margin (15 sectors or more), and then MPEG. A data section is provided, and finally a rear margin (15 sectors or more) is provided. An index number 00 is assigned to the pause margin, and index numbers 01 to 9 are assigned to the front margin, the MPEG data portion, and the rear margin.
9 is attached.

As shown in FIG. 5B, each sector is provided with a pack header (PHD) at the beginning, followed by pack data (PDT). A sector forms one pack (2324 bytes). And, as shown,
The pack data (PDT) is composed of one packet (Packet), and this packet is composed of a packet header (PC).
H) and packet data (PCD). In this case, a start code, a reference clock, a transfer rate, and the like are recorded in the pack header (PHD). In the packet, the packet header (PCH)
Record a start code, a stream type (separate of image data / audio data), a reproduction start time, a decode start time, and the like. Packet data (PCD)
Records compressed image data for at least one screen and / or compressed audio data for one frame, and other data. The image data includes about 1.
2 Mb / s is assigned and audio data is
0.2 Mb / sec is assigned.

FIG. 6 is an explanatory diagram showing an example of a hierarchical structure of compressed image data in the MPEG format.

As shown in FIG. 6, the compressed image data is composed of a sequence layer, a GOP (Group of Picture) layer, and a picture layer. The sequence layer is composed of a large number of continuous sequences. Each sequence has a sequence header (H
D) is provided, thereafter, a plurality of GOPs are provided continuously, and finally, a sequence end code is provided, and these constitute one sequence. In addition, the GOP layer starts with a GOP that is a start code.
A header (HD) is provided, followed by I, P, B
Pictures B ₁ , B ₂ , I ₃ , B ₄ , B ₅ , P ₆ ,
_{B 7, B 8, P 9} , B 10, B 11, P 12, B 13, B 14, P
₁₅ are provided, and these constitute one GOP. Note that the number of three types of pictures, I, P, and B, is
15 is recommended. Further, the picture layer is provided with a picture header (HD) which is a start code at first, and then with coded data, and these constitute one picture. In this case, in each of the I, P, and B pictures, the I picture is an intra-frame coded image that can be independently decoded by itself and has the largest data amount compared to the P picture or the B picture. It is. The P picture is an inter-frame predictive coded image that has been predictively coded based on the latest past I picture and P picture, has a smaller data amount than the I picture, and has a smaller data amount than the B picture. The data volume is large. B picture is M
A PEG-specific picture that has been inter-frame coded from both the latest past I or P picture and the next arriving I or P picture, compared to the other two pictures. It has the least amount of data.

FIG. 7 shows three types of I, P and B.
FIG. 3 is an explanatory diagram showing an original picture order (reproduction order) of a picture and a recording order on a video CD.

As shown in FIG. 7, for 15 pictures of three types, I, P and B, the original picture order is B ₁ , B ₂ ,
I ₃ , B ₄ , B ₅ , P ₆ , B ₇ , B ₈ , P ₉ , B ₁₀ , B
₁₁ , P ₁₂ , B ₁₃ , B ₁₄ , P ₁₅
Is slightly different from the original image sequence in the order of I ₃ , B ₁ , B ₂ , P ₆ , B ₄ , B ₅ , P ₉ , B ₇ , B
_8, becomes the order of _{P 12, B 10, B 11} , P 15, B 13, B 14,
The playback order from the video CD is the same as the original image order, B ₁ , B
_{2, I 3, B 4,} B 5, P 6, B 7, B 8, P 9,
B _10, B _11, in which has become _{P 12, B 13, B 14} , P 15. As described above, the reason why the order of recording on the video CD and the order of reproduction from the video CD are different for the three types of 15 pictures of I, P, and B is to reduce the capacity of the frame memory of the decoder as much as possible. That's why.

Then, 15 pictures B ₁ , B ₂ , I ₃ , B ₄ , B ₅ , P ₆ , B ₇ , three kinds of pictures I, P and B are provided.
B ₈ , P ₉ , B ₁₀ , B ₁₁ , P ₁₂ , B ₁₃ , B ₁₄ , and P ₁₅ are M
When PEG decoded, as described above, I ₃
The picture is MPEG decoded by itself, but P ₆
Pictures are MPEG decoded using MPEG decoded I ₃ pictures, P ₉ pictures are MPEG decoded using MPEG decoded P ₆ pictures, and P ₁₂ pictures are MPEG decoded using MPEG decoded P ₉ pictures. is, P ₁₅ picture MP
Are those MPEG decoded using EG decoded P ₁₂ pictures. Further, B ₁ picture, B ₂ pictures are both, P _15, which is MPEG decoded in I ₃ picture and the first forward GOP which is MPEG decoded
Is MPEG decoded using pictures, B ₄ pictures, B ₅ pictures are both be MPEG decoded using P ₆ picture is I ₃ picture and the decoding is MPEG decoded, in the same manner, B ₇ pictures, B ₈ pictures, B ₁₀ pictures, B ₁₁ pictures, B ₁₃
Picture, B ₁₄ pictures are also intended to be MPEG decoded.

In this case, although not shown in FIGS. 4 to 7,
Known video CDs are generally similar to known consumer video tape recorders (VTRs), except for special ones.
Slow motion video information is not recorded. When playing back a slow-motion movie based on a video CD that does not record such slow-motion movie information, the display screen of the same frame is repeated many times during playback of the slow-motion movie, as is known. Play, thereby playing a pseudo slow motion video.

[0015]

When a recorded content of a known video CD is reproduced by a known video CD player, a video CD without recording of slow-motion moving image information is used.
As described above, when playing a slow-motion video, the display screen of the same frame is repeatedly played many times, and thereby a pseudo slow-motion video is played. In this case, the slow motion reproduction based on the recorded contents of the video CD in this case is merely a continuous automatic frame feed.

That is, in a known video CD player, one display image is obtained every (1/30) second during normal reproduction of a video CD, whereas (n) / 30) seconds (where n is an integer of 2 or more) is stretched so that one display image can be obtained. Therefore, the movement between one display image and the next display image appears. There is a problem that the size of the moving object becomes large and the movement of the moving object on the display screen becomes very turbulent.

The present invention solves the above problems,
An object of the present invention is to provide a video CD player in which the motion of a display screen is smoothed during slow motion reproduction of a video CD without recording of slow motion video information.

[0018]

In order to achieve the above object, the present invention provides a method for reading compressed digital image data from a disk on which compressed digital image data comprising I, P, and B pictures is recorded in an MPEG format. A disc player comprising: a reading unit; a data processing unit that performs signal processing on the read compressed digital image data; an MPEG decoder that performs MPEG decoding on the signal-processed compressed digital image data; and a control unit that controls the entire operation. , P / B pic to extract P picture or B picture when playing slow motion video
And a P / B picture extraction unit.
An interpolated signal that generates an interpolated motion vector whose length is a fraction of the length in the same direction as the motion vector based on the obtained P-picture or B-picture motion vector, and forms an additional picture using the interpolated motion vector A decoding unit is provided. When the MPEG decoder performs MPEG decoding, the I, P, and B pictures read from the disc are fitted with the additional pictures formed by the interpolation signal forming unit and then decoded. Means for obtaining a slow motion display image of continuous motion is provided.

[0019]

According to the above means, a disc (video CD) is stored in a video CD player as a disc player.
When playing back a slow motion video, the control unit monitors whether or not slow motion video information is present in the compressed digital image data read from the disc when the slow motion video playback instruction is issued. Only when it is not possible to confirm the existence of moving image information, based on the motion vectors of the P and B pictures, generate an interpolated motion vector having a length of a fraction in the same direction as the motion vector for the interpolation signal forming unit. At the same time, a command to create an additional picture using the interpolation motion vector is supplied. In this case, the interpolation signal forming unit creates an interpolation motion vector and an additional picture based on a command from the control unit, and supplies the created additional picture to the MPEG video decoder. The MPEG video decoder inserts the additional picture supplied from the interpolation signal forming unit between the I, P, and B pictures read from the disc, and generates a picture group in which the additional picture is inserted between the I, P, and B pictures. MPEG decoding is performed to obtain a slow motion display image of continuous motion.

As described above, according to the above-mentioned means, even when the slow motion video information is not recorded on the disc, the additional picture inserted between the I, P, and B pictures is reproduced during the playback of the slow motion video. Accordingly, the motion of the moving object is appropriately interpolated, and a display image having a smooth motion can be formed.

[0021]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of a disc player according to the present invention. In this embodiment, a video C is used as the disc player.
It shows an example of a D player.

In FIG. 1, 1 is a CD drive, 2
Is a data reading unit, 3 is a data processing unit, 4 is a random access memory (RAM), 5 is a control unit, 6 is a servo circuit,
7 is an MPEG video decoder, 8 is a first dynamic random access memory (DRAM), 9 is a first digital-analog converter (A / D), 10 is an MPEG audio decoder, 11 is a second dynamic random access memory (DRAM). , 12 is a second digital-analog converter (A / D), 13 is an interpolation signal forming unit, 14 is an analog video signal output terminal, and 15 is an analog audio signal output terminal.

The output of the CD drive 1 is connected to the input of the compressed data reading unit 2, and the output of the compressed data reading unit 2 is connected to the input of the data processing unit 3. The data processing unit 3 is connected to the RAM 4 and the output is connected to the control unit 5. The control unit 5 controls the interpolation signal forming unit 1
3 is connected to the CD drive device 1 via the servo circuit 6. The video output of the control unit 5 is
The control unit 5 is connected to the input of the MPEG video decoder 7 and
Audio output of the MPEG audio decoder 10
Connected to the input of The MPEG video decoder 7 is connected to the first DRAM 8 and the interpolation signal forming unit 13, and has an output connected to an input of the first digital-analog converter 9. The MPEG audio decoder 10
While the DRAM 11 is connected, the output is connected to the input of the second digital-analog converter 12. The first digital-analog converter 9 has an output connected to the analog video signal output terminal 14, and the second digital-analog converter 12 has an output connected to the analog audio signal output terminal 15.
Connected to.

FIGS. 2A and 2B are various explanatory views for explaining the operation of the present embodiment shown in FIG. 1. FIG. 2A is a diagram in which an additional picture according to the present embodiment is inserted (1/2). )
Slow motion pictures (I, P, B pictures)
(B) is an arrangement diagram of each of the known I, P, and B pictures at the time of performing (1/2) slow motion moving image display, and (c) is a diagram in which an additional picture in this embodiment is embedded. (1/2) picture for slow motion (I,
P, B pictures) when decoding MPEG,
FIG. 4 is an explanatory diagram showing the relationship between P and B pictures and additional pictures. 2A to 2C, the I, P, and B pictures shown are I, P, and B shown in FIG.
B shows only a part of the arrangement of each picture.

FIG. 3 is an explanatory view showing an example of a (1/2) slow motion display image displayed in the present embodiment shown in FIG. 1, wherein one display image and a subsequent display image are displayed. The figure shows an example in which one additional picture is inserted between.

Here, the operation of the video CD player according to the present embodiment will be described with reference to FIGS.
However, in the present embodiment, for the sake of convenience, description will be made on the assumption that (1/2) slow-motion moving image playback is performed during slow-motion moving image playback.

When the CD drive 1 is driven by the servo circuit 6 after loading a video CD (not shown), the loaded video CD rotates. The compressed data reading unit 2 reads the compressed digital data recorded on the rotationally driven video CD, amplifies the read compressed digital data and shapes the waveform, and supplies the amplified data to the subsequent data processing unit 3. The data processing unit 3 performs first digital processing including demodulation processing, error detection and correction processing, and demodulation processing of CD-ROM format MPEG data using the RAM 4 on the input compressed digital data. Detection and correction processing, address information (time information)
And a second digital process including an extraction process, and supplies the result to the control unit 5. When the CD drive 1 reads compressed digital data from a video CD under the control of the control unit 5, the servo circuit 6 performs various servo controls in the CD drive 1, for example, a rotary servo, a focusing servo, and a tracking servo. And controls the feed servo and the like.

Next, when the digitally processed compressed digital data is supplied from the data processing unit 3, the control unit 5 separates the digital data into compressed digital video data and compressed digital audio data.
The compressed digital audio data is supplied to the EG video decoder 7, and the compressed digital audio data is supplied to the MPEG audio decoder 10. At this time, the MPEG video decoder 7 outputs the first DR
Using the AM 8, the input compressed digital video data is decoded by the MPEG system, and the MPEG-decoded digital video signal is supplied to the next first (A / D) 9. The first (A / D) 9 converts the digital video signal decoded by MPEG into an analog video signal,
An external circuit (not shown) via the analog video signal output terminal 14 for displaying the converted analog video signal
To supply. On the other hand, the MPEG audio decoder 10
Uses the second DRAM 11 to decode the input compressed digital audio data in accordance with the MPEG method, and supplies the MPEG-decoded digital audio signal to the next second (A / D) 12. Second (A / D)
Numeral 12 converts the MPEG-decoded digital audio signal to an analog audio signal, and supplies the converted analog audio signal to an external circuit (not shown) via an analog audio signal output terminal 15 for voice output.

In the above description, the video C of the present embodiment has been described.
The case where the D player does not perform the slow motion video playback operation will be described. In the following description, the case where the video CD player of the present embodiment performs the slow motion video playback operation will be described.

First, when the video CD player is set to a slow motion video playback state by operating an operation unit or the like (not shown), the control unit 5 causes the data processing unit 3 to operate.
After extracting a P picture or a B picture from the compressed digital image data supplied from, the picture is supplied to the interpolation signal forming unit 13. At this time, the interpolation signal forming unit 13 responds to the command from the control unit 5 to
Based on a motion vector of a picture or a B picture, an interpolation motion vector having a length (1/2) is generated in the same direction as the motion vector, and one display image is generated by using the obtained interpolation motion vector. An additional picture is created to interpolate the motion of the moving object with the subsequent display image. Next, the control unit 5 supplies each of the I, P, and B pictures to the MPEG video decoder 7, and at the same time,
Indicates that the created additional picture is M
This is supplied to the PEG video decoder 7. In the MPEG video decoder 7, under the control of the control unit 5, the supplied additional picture is inserted between the supplied I, P, and B pictures. Decoding is performed.
Subsequently, the first (D / A) 9 converts the video digital signal MPEG-decoded by the MPEG video decoder 7 into a video analog signal, and the converted video analog signal is supplied to an image display unit (not shown).
The slow motion video is played back with the motion of the moving object interpolated.

In this case, as shown in FIG.
The additional pictures formed by the interpolation signal forming unit 13 are denoted by X ₁ , X ₂ , X ₃ , X ₄ , X ₅ , X ₆ , respectively, and I, P,
.., I ₃ , B ₄ , B ₅ , P in each B picture
_{6, B 7, B 8,} P 9, ..., a ... part of, are fitted additional picture X ₁ to X ₆ are each (1/2) if a slow motion picture is obtained, MPEG video decoder 7 The (１ ／) slow-motion picture formed by the following equation is: I ₃ , X ₁ , B ₄ , X ₂ , B
_{5, X 3, P 6,} X 4, B 7, X 5, B 8, X 6,
P ₉ ,...

In order to obtain a (1/2) slow-motion picture without embedding the additional pictures X _{1 to} X ₆ in a known video CD player, as shown in FIG. , P, B,..., I ₃ , B ₄ , B ₅ , P ₆ , B ₇ , B
_8, P _9, ... to play repeatedly each part of, MPEG is formed by the video decoder 7 (1/2) picture for slow _{motion, ..., ..., I 3,} I 3, B 4, B 4,
_{B 5, B 5, P 6} , P 6, B 7, B 7, B 8, B 8, P
₉ ,….

Subsequently, additional pictures X _{1 to} X _{1
In the case} of performing MPEG decoding on a group of pictures into which ₆ is inserted, as shown in FIG. 2C, the I ₃ picture is decoded independently, but the B ₄ picture is decoded using the I ₃ picture and the P ₆ picture. decoded, B ₅ picture also I
₃ is decoded using the pictures and P ₆ picture.
The P ₆ picture is decoded using the I ₃ picture,
₇ picture and B ₈ picture are both decoded using P ₆ picture and P ₉ picture, and P ₉ picture is
Decoded using ₆ pictures. FIG. 2 (c)
, The additional pictures X ₁ , X ₂ , X ₃ , X
₄ , X ₅ , and X ₆ are all decoded using the information of the corresponding I picture or P picture and the motion vector obtained by reducing the motion vector of the corresponding B picture to (１ ／).

The picture group into which the additional pictures X _{1 to} X ₆ have been inserted is MPEG-decoded and then converted into an analog signal. The obtained video analog signal is displayed on an image display unit (not shown). the presence of the picture X ₁ to X _6, the movement of the moving body (automobile) becomes as smooth. That is, as shown in FIG. 3, one display image, for example, an n-th display image and a subsequent (n)
+1) Since one display image is additionally interpolated between the display image and the display image, the movement of the car traveling in the direction of the arrow is
It becomes smoother than a known slow motion display image.

In the above-described embodiment, the reproduction of a (1/2) slow motion video has been described as an example of the slow motion video. However, the reproduction of the slow motion video in the video CD player according to the present invention is (1/2).
2) Not limited to slow motion videos,
(1/3) slow motion video, (1/4) slow motion video, (1/5) slow motion video, and the like can be similarly handled.

However, in the case of a (1/3) slow motion moving image, the additional picture inserted between each of the I, P, and B pictures is created by an interpolation motion vector having a length of (1/3). One additional picture and (2
/ 3) and another additional picture created by an interpolation motion vector having a length. In the case of a (1/4) slow motion video, each of the two additional pictures is inserted between I, P, and B pictures. The additional picture to be created includes a first additional picture created by an interpolation motion vector having a length of (１ ／) and a second additional picture created by an interpolation motion vector having a length of (１ ／). , (3/4) of the interpolated motion vector and the third additional picture created by the interpolation motion vector. The same applies to the case of a (1/5) slow motion video, in which case I, P,
B Four additional pictures are inserted between the pictures.

As described above, according to the present embodiment, the interpolation signal forming unit 13 creates the interpolation motion vector and the additional picture based on the instruction of the control unit 5 during the reproduction of the slow motion video, and The picture is supplied to the MPEG video decoder 7, and the MPEG video decoder 7
The additional picture supplied from the interpolation signal forming unit 13 is inserted into each of the I, P, and B pictures read from the video CD, and a picture group in which the additional picture is inserted into each of the I, P, and B pictures is MPEG-decoded. Since the MPEG decoded video analog signal is supplied to the image display unit, the image display unit can obtain a slow motion display image having a continuous motion.

In the above embodiment, the case where the disc player is a video CD player has been described as an example. However, the disc player according to the present invention is not limited to a video CD player, and other similar discs may be used. It is equally applicable to players, for example digital video disc (DVD) players.

[0040]

As described above in detail, in the disc player of the present invention, an interpolated motion vector whose length is a fraction of the length in the same direction as the motion vector based on the P- or B-picture motion vector. And an interpolation signal forming unit 13 for creating an additional picture using the interpolation motion vector is provided. During slow motion reproduction of the disc, the control unit 5 transmits the interpolation motion vector to the interpolation signal formation unit 13. And an additional picture is created, and the created additional picture is supplied to the MPEG video decoder 7. In the MPEG video decoder 7, the interpolation signal forming unit 13 is inserted between the I, P, and B pictures read from the disk. MPEG decoding is performed with the additional picture supplied from.

As described above, according to the disc player of the present invention, when a slow motion video is reproduced, I, P,
There is an effect that the motion of the moving object of the display image is appropriately interpolated by the additional picture inserted between the B pictures, so that a display image having a smooth motion can be formed.

[Brief description of the drawings]

FIG. 1 shows a disc player (video CD) according to the present invention.
FIG. 2 is a block diagram showing a configuration of an embodiment of a player).

FIGS. 2A and 2B are various explanatory diagrams for explaining the operation of the video CD player of the embodiment shown in FIG.

FIG. 3 is displayed in the present embodiment shown in FIG.
FIG. 2B is an explanatory diagram illustrating an example of a slow motion display image.

FIG. 4 is an explanatory diagram showing a configuration of a disc in a video CD.

FIG. 5 is an explanatory diagram showing the configuration of tracks and sectors in a video CD.

FIG. 6 is an explanatory diagram showing an example of a hierarchical structure of compressed image data in the MPEG format.

FIG. 7 is an explanatory diagram showing an original picture order (playback order) and a recording order of three types of 15 pictures of I, P, and B.

[Explanation of symbols]

Reference Signs List 1 CD drive device 2 Data reading unit 3 Data processing unit 4 Random access memory (RAM) 5 Control unit 6 Servo circuit 7 MPEG video decoder 8 First dynamic random access memory (DRA)
M) 9 first digital-analog converter (D / A) 10 MPEG audio decoder 11 second dynamic random access memory (DR)
AM) 12 Second digital-analog converter (D / A) 13 Interpolation signal forming unit 14 Analog video signal output terminal 15 Analog audio signal output terminal

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 5/76-5/956 H04N ^7/ 24-7/68 G11B 20/10-20/12

Claims (5)

(57) [Claims] 1. A data reading unit for reading compressed digital image data from a disk on which compressed digital image data composed of I, P, and B pictures are recorded in an MPEG format, and data for signal processing the read compressed digital image data A disk player including a processing unit, an MPEG decoder for MPEG-decoding the signal-processed compressed digital image data, and a control unit for controlling the overall operation extracts a P-picture or a B-picture when a slow-motion moving image is reproduced. P / B pic
And a P / B picture extraction unit.
An interpolated signal that generates an interpolated motion vector whose length is a fraction of the length in the same direction as the motion vector based on the obtained P-picture or B-picture motion vector, and forms an additional picture using the interpolated motion vector A decoding unit is provided. When the MPEG decoder performs MPEG decoding, the I, P, and B pictures read from the disc are fitted with the additional pictures formed by the interpolation signal forming unit and then decoded. A disc player characterized by obtaining a slow motion display image of continuous movement. 2. The MPEG decoder comprises an MPEG video decoder and an MPEG audio decoder.
The disk according to claim 1, wherein the fitting of the additional picture formed by the interpolation signal forming unit and the decoding of each of the I, P, and B pictures in which the additional picture is fitted are performed by the MPEG video decoder. player. 3. The control unit controls the interpolation signal forming unit to determine whether or not slow motion video information is present in the read compressed digital image data. 2. The disc player according to claim 1, wherein formation is instructed. 4. The disc player includes a video CD.
4. The disc player according to claim 1, wherein the disc player is a player. 5. The disc player according to claim 1, wherein the disc player is a DVD player.