JPH07274114A - Method and device for reproducing digitally compressed dynamic image at high speed - Google Patents

Abstract

PURPOSE:To reproduce data as a natural picture from a disk at high speed. CONSTITUTION:When a encoding screen group which can reproduce one group of pictures and which consists of plural continuous pictures that are picture- compressed, is reproduced from a disk 10, a high speed reproduction mode is indicated 26, a signal which a pickup 20 reads from the disk 10 is converted 21 into to the encoding screen group 55 and reproduced position information 54, and a display screen group 56 and a picture identification signal 57 are obtained 30. A motor control signal 51, a pickup control signal 52 and a decoding processing control signal 53 are obtained 25 by referring to a reproduction mode signal 58, the pickup 20 is shifted 24 to a prescribed position and the rotation of a spindle motor 22 is controlled 23. Thus, the same specified picture (I picture) is prevented from being displayed for many times in high speed reproduction, and unnaturalness is eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for reproducing a disc on which a digitally compressed moving image is recorded at high speed. Specifically, it is an object of the present invention to provide a novel high-speed reproduction method and device for decoding compressed data using predictive coding that is spirally or concentrically recorded on a disc that is a recording medium.

[0002]

2. Description of the Related Art There is no example of a high-speed reproduction method of compressed data for a disk device. The video tape recorder (hereinafter referred to as VTR) is described in the following document.

Reference 1. Akihiro Takeuchi et al. "A study of high-speed playback system for high compression type digital VTR" IEICE Technical Report MR93
-28 October 1993

The outline of Document 1 will be described below by applying MPEG-1 as an example to a disc reproducing apparatus.

FIG. 18 shows MP, which is an international standard for moving picture compression.
In the definition of EG-1 (Moving Picture CodingExperts Group), a plurality of pictures are displayed in a screen group (GOP: Group).
of Pictures) are formed. The picture is an intra-frame encoded I picture (Intra Picture).
s), a P picture (Predicted Pictures) that is predicted only from the past and is inter-frame coded, and a B picture (Bi-dir) that is predicted from both the past and the future and is inter-frame coded.
ectional Prediction Pictures) There are three types of screens that, one display screen group G _d i number of pictures N of
Is 15 and the I / P picture period M is 3, the time t
The screens in the chronological order of are illustrated. The display screen group G _d 1 is followed by G _d 2.

FIG. 19A shows an array of pictures (screens) included in the display screen groups G _d 1, G _d 2 and G _d 3 according to MPEG1, and FIG. The arrangement of the pictures included in the coded screen groups G _c 1, G _c 2, G _c 3 is shown in (c) of the figure, and symbol examples of (a) and (b) are shown. The arrangement of pictures included in the display screen groups G _d 1, G _d 2, G _d 3 is G _c 1, G _c 2, G _c 3 of (b).
The difference is that the predictive coding is performed using B pictures.

FIG. 20 shows a part of the configuration of an apparatus for high-speed reproduction of a moving image by predictive coding recorded on a disk 10 which is a medium disk. In the case of high-speed reproduction, the detection position of the pickup 20 traces and moves from point a on the spiral (or concentric circle) track 11 on which the image code is recorded to point b at the root of the arrow 12, where the tip of the arrow 12 is located. It skips to the point c on the track 11 and moves to the point d. The output of the pickup 20 is extracted as a code by the signal conversion unit 21, temporarily stored in the buffer 32, received by the decoding processing control signal 53 from the system control unit 25, decoded by the decoder 33, and displayed on the display 40. To be done. Also, the picture identification signal 57 obtained at the time of decoding is output to the system control unit 25.

FIG. 21 shows the operation of the pickup 20. In FIG. 21A, the beam of the pickup 20 traces from the point a to the point b on the track 11, skips from the point b to the point c, and d point. Although the tracing is performed up to, the seek time other than the effective tracing time for obtaining the desired image signal is often longer than the skip time as shown in FIG. Since the seek time is not constant, the reproduction signal output from the signal conversion unit 21 is temporarily stored in the buffer 3
2 is stored in the decoder 3 in synchronization with the frame synchronization signal and the like.
Decrypted at 3.

For example, when the double speed reproduction is performed, the screen display is normally performed while skipping one picture at a time. However, in encoded data compressed using prediction, a predictively encoded picture cannot be decoded unless the referenced picture is reproduced. The compressed picture has a different data amount for each picture, and the pickup 20 for reading from the disc 10
Cannot be freely moved to an arbitrary position, and therefore the code is not read as appropriate in picture units. Therefore, in Document 1, high-speed reproduction is performed by the following method.

Each of FIGS. 22 (a), (b), (c) and (d) shows a pickup 2 for reproducing at double speed.
The output of 0, the output of buffer 32, the array of pictures on the screen and the example symbols used there are given.
As shown in (a) of the figure, when the pickup 20 seeks the picture 12I (indicating that it is the second picture of the first screen group and is the I picture), it next seeks 22I. , Seeking 32I. Then, in the output of the buffer 32 in FIG.
I, 12I, 22I, 32I in order of GOP number 0,
Only the second I picture in the screen display order of 1, 2, 3 is output. Therefore, as shown in FIG. 6C, since only the I picture of each GOP is displayed on the screen, the same screen continues and the screen is unnatural with little movement.

[0011]

As described above, according to MPEG1, for example, in order to realize high image compression efficiency, compression encoding using prediction between pictures as shown in FIGS. 18 and 19 is performed. I do. Since it is difficult to reproduce images of P-pictures and B-pictures using only their own data, high-speed reproduction using only I-picture data that does not require a reference image is easy. In the high-speed reproduction in this case, as shown in FIG. 22C, a large number of the second I pictures 12I of the first display screen group are continuously displayed on the screen, and then the second I picture 12I of the second display screen group is displayed. I picture 2
Since a large number of 2Is are continuously displayed, there is a problem to be solved that the movement becomes unnatural.

[0012]

When a high-speed reproduction of a coded picture group consisting of a plurality of picture-compressed continuous pictures capable of reproducing a group of pictures from a medium disk spirally or concentrically recorded. A reproduction mode input means for giving an instruction of a high-speed reproduction mode, a signal conversion means for converting a signal read out from the medium disk by the pickup into the encoded screen group and reproduction position information of the pickup, and display from the encoded screen group. Decoding means for decoding the screen group and outputting a picture identification signal at the same time, a motor control signal for controlling the motor and a pickup control signal for controlling the pickup while referring to the reproduction mode signal, the reproduction position information of the pickup and the picture identification signal. And a system control means for outputting a decoding process control signal for controlling the decoding process, and a pick When the read position of the pickup is read from the pickup control signal by one coded screen group or one coded screen group and the data for the first several screens of the coded screen group that follows it, another data which is not continuous is read. Pickup control means for moving to the position where the encoded screen group is recorded and motor control means for controlling the rotation speed of the spindle motor for rotating the medium disk according to the motor control signal are provided.

[0013]

With respect to the coded screen group which is the target of the encoding process, the same process as in the case of reproducing at the normal speed is performed regardless of the speed of the high speed reproduction, so that the same specific picture is displayed many times in the high speed reproduction. There is no unnatural movement. Therefore, there is an effect that the high speed reproduction speed can be freely set.

It is also possible to hierarchize an arbitrary component of a pixel block constituting each picture and reproduce only a high priority part of the arbitrary component in high speed reproduction. Further, if the search is missed in the first high-speed reproduction, the search location can be shifted.

[0015]

【Example】

Example 1. FIG. 1 shows the circuit configuration of an embodiment of the present invention. A moving image by predictive coding is recorded on the spiral track 11 of the disk 10, and the reading position of the pickup 20 is skipped as shown by an arrow 12 as in the case of FIG. During high-speed reproduction, a reproduction mode signal 58 for instructing high-speed reproduction from the reproduction mode input unit 26, reproduction position information 54 indicating the reproduction position of the pickup 20 output from the signal conversion unit 21, and the decoding unit 3.
The system control unit 25 controls the spindle motor 22 that drives the disk 10 in response to the picture identification signal 57 output from the motor control unit 23.
And a pickup control signal 52 to the pickup control unit 24 that performs the skip operation of the pickup 20.

FIG. 2 shows that the system control unit 25 includes a GOP period detector 29, and the decoding unit 30 includes a buffer 32 and a decoder 33. G
The OP period detector 29 detects the GOP period, whereby the system control unit 25 controls each unit.

The signal converter 21 converts the signal read by the pickup 20 into the coded screen group 55 and the reproduction position information 54 of the pickup 20 and sends them to the decoder 30 and the system controller 25, respectively. The motor control unit 23 controls the spindle motor 22 by the motor control signal 51 from the system control unit 25 to control the rotation speed of the disk 10. The pickup control unit 24 receives the pickup 20 according to the pickup control signal 52 from the system control unit 25.
The skip operation is performed.

As shown in FIG. 2, the decoding unit 30 includes a buffer 32 and a decoder 33, and according to a decoding processing control signal 53 sent from the system control unit 25,
The display screen group is decoded from the coded screen group read by the pickup 20 and displayed on the display 40.

According to the present invention, when one coded screen group G _c i is read out, another coded screen group G _c which is distant from it is then read.
The operation is simple if the method of reading out one j is taken, but the coded screen group G _c i may not be closed (decoded) by itself, so that the coded screen group immediately before is not. In some cases, a predicted picture may be obtained by referring to the picture included in G _c i-1. In the present embodiment, even in such a case, a method of displaying the same number of consecutive pictures as the pictures included in one display screen group G _c i by reading the encoded data more than the number of pictures to be actually displayed is provided. Disclosure.

FIG. 3A shows the disk 10 of the apparatus shown in FIG.
The encoded screen group G _c i (for example, i = 2) obtained by reading from the pickup 20 during normal reproduction is shown in FIG. 6B at a speed r (r> 1) times that of normal reproduction. The high-speed coded screen group G _cp i (for example, i = 2) required for high-speed reproduction obtained by reading from the pickup 20 when 10 is rotated at high speed is shown in FIGS. An explanation of the symbols of each picture shown in c) is shown.

At the time of normal reproduction shown in FIG. 3A, the pickup 20 moves from the track 11 on the disc 10 to the MPE.
In order to read the picture data in the screen order defined by G1, the second digit symbol indicating the screen display order is not arranged in the display order. As shown in FIG. 3B, during high-speed reproduction, the disk 10 is rotated at a speed r times that of normal reproduction under the control of the motor controller 23.
The pictures 22I to 31B in the normal reproduction shown in FIG.
Reading up to B.

Here, in the normal reproduction shown in FIG. 9A, G _c 1 is placed before the coded screen group G _c 2 specified here.
, And G _c 3 is read after that, it is possible to reproduce all the pictures of G _c 2. On the other hand, in high-speed reproduction, the high-speed encoded screen group G _cp 2 in FIG.
Just before reading the
_If 20B and 21B of _cp 2 were predicted from 1 EP of G _c 1, then 20B and 21B cannot be decoded.

Here, to display the same number of consecutive pictures as the number of victims in one display screen group G _d i, G _c 3
It is necessary to add and read the three pictures of 32I, 30B, and 31B included in 1) or read the data from the EP of G _c 1. In this embodiment, the former is described. The signal of each picture read by the pickup 20 in this way is included in the signal converter 3 included in the decoding unit.
It is temporarily stored in the buffer 32 via 1 and is decoded by the decoder 33 at a required time. It should be noted that, here, continuous pictures are displayed by reading out more data than the number of pictures to be actually displayed. However, pictures that cannot be read and decoded in one encoded screen group G _c i are not displayed. Alternatively, the coded screen group G _c i read by high-speed reproduction at the time of encoding can be subjected to high-speed reproduction without performing prediction from the previous picture.

In FIG. 4A, the output of the pickup 20 thus read in the double speed high speed reproduction mode, the output of the buffer 32 in FIG. 4B, and the high speed in FIG. 4C are shown. The screen displayed by the reproduction shows the details of the picture displayed in one high-speed screen group D _dpi (i = 2) in (c) in (d). Pickup 2 shown in FIG.
0 is output to the high-speed encoded screen group G _cp i (i = 2, 4,
6) is read out with a seek operation interposed therebetween.
In the output of the buffer 32 of FIG. 9B, the seek operation period is filled, the decoding processing is performed, and the high-speed display screen group G _dp i (i = 0, 2, 4, 6) of FIG. To be done. FIG. 6 (d) shows the enlarged contents of the time t of the high-speed display screen group G _dp i (i = 2). According to this, G _dp 2 shows the screen display order 2 to E of GOP2. , GOP3 screen display order 0 and 1 are included.

In the display example of FIG. 4, for example, all the pictures (frames) that can be reproduced from the high-speed encoded screen group G _cp 2 are displayed on the screen 22I to 31B in FIG. It is also possible to thin out and display an appropriate picture according to the above. Alternatively, a picture that can be played back from the high-speed coded screen group G _cp i may be played back from a picture (frame) in the middle without being played back from the first picture (frame) in the group.

FIG. 5A shows a high-speed display screen group G _dp i (i = 0, 3, 6, 9, ...) In the case of 3 × speed, which is shown in FIG.
Is a high-speed display screen group G _dp i (i = 0,
4, 8, 12, ...), but in FIG. 7C, the high-speed display screen group G _dp i (i = 0, S, 2S, 3S, ...) In the case of S speed.
Is displayed as time t elapses. Although the normal reproduction is performed without skipping the pickup 20 in the first embodiment, even in the normal reproduction, the disk 10 is rotated at a high speed to read necessary data, and then temporarily read until the next data is read. It is also possible to pause the reading. In this case, it is not necessary to particularly increase the rotation speed of the disk 10 during high speed reproduction.

Example 2. The circuit configuration of the high-speed reproducing apparatus according to the second embodiment of the present invention is the same as that shown in FIG.

FIG. 6, FIG. 7, FIG. 8 and FIG. 9 show frequency components reproduced by the apparatus of FIG. Here, FIG.
As shown in (a), each picture has A pixel blocks B
It is assumed to be divided into 0 to BA-1. For example, 8
Each block divided into × 8 pixels is converted into a frequency component as shown in FIG. 7B by two-dimensional DCT of the pixel shown in FIG. 7A as a level signal or a differential signal of each pixel. It Here, each pixel block Bi (i =
0 to A-1) are converted into frequency component blocks B _f i. FIG. 6B shows the frequency component block B _f of FIG. 7B.
i is a schematic diagram. Each frequency component block B _f i is hierarchized into a block low band component B _f iL and a block high band component B _f iH as shown in FIG. 8, for example. The state of the picture at that time is shown in FIG.

FIG. 10 shows a block low-pass component B _f i in a pixel block that can be used in the second embodiment.
It shows various aspects of the division of L and the block high-frequency component B _f iH. That is, FIG. 9A is the diagonal division shown in FIG. FIG. 10 (b) shows an inverted L-shaped division, FIG. 10 (c) shows vertical division, and FIG. 10 (d) shows horizontal division. In the following description, the diagonal division in FIG.

In FIG. 11, the block low-frequency components B _f iL (i = 0) of many pixel blocks included in the picture Pi (i = 0) in the decoder 33 included in the decoding unit 30 of the apparatus of FIG.
Shows how to handle to A-1) and block high-frequency component B _f iH. Each block low-frequency component _Bf iL and block high-frequency component B _f iH included in the picture P0 of FIG. 11A is the block low-frequency component B _f iL (i = 0 to a-1) a batch, then together collectively block high-frequency component _{B f iH (i = 0~A-} 1), FIG (picture as shown in c) the low-frequency component P _f iL (i = 0) and picture high-frequency component P _f iH
The processing is performed as (i = 0). This is represented for each picture by two frequency components as shown in FIG.

FIG. 12 shows the low-frequency components P _f of C pictures.
iL (i = 1~C-1) and a picture high frequency component P _f i
The state of the process of collecting H 2 is shown. Each picture low-pass component P _f iL and picture high-pass component P in FIG.
_f iH is the low frequency component P _f i of each picture as shown in FIG.
Collectively L (i = 0~C-1) , together collectively then each picture high frequency component _{P f iH (i = 0~C-} 1), the group as shown in FIG. (C) Low-frequency component G _f iL (i =
0) and the group high-frequency component G _f iH (i = 0).

In the above description, the block low frequency component B _f
iL and block high frequency component B _f iH and group low frequency component G _f
The case where iL and i indicating the order of the group high-frequency components G _f iH are sequentially arranged has been described, but the order may be shuffled (random order) or the like.

The contents of the track 11 on the disk 10 are shown in FIG. 13 (a), and the symbols representing the contents are shown in FIG. 13 (b). From the center side of the spiral track 11, the group low band component G _f 0L, the group high band component G _f 0H, the group low band component G _f 1L, the group high band component G _f 1H, and the group low band component G _f 2
L, group high frequency component G _f 2H, group low frequency component G _f 3L, ... Are recorded in this order. In normal reproduction, all group low band components and group high band components G _f 0L, G _f 0H, G _f 1L, G _f 1H,
G _f 2L, G _f 2H, G _f 3L, ... Are reproduced, but in high-speed reproduction, the group high frequency component G _f iH is not reproduced, and only the necessary one of the group low frequency components G _f iL is reproduced. Skip and play. In this reproduction, since the group high frequency component G _f iH is skipped, time can be spared, and by using it as a seek period, high speed reproduction can be realized as in the case of the first embodiment. In addition, this Example 2
In the case but coded frame group G _c i is described as being coded completely independently, which is predicted from the previous coded frame group G _c i-1 is Example 1 As described above, the decoding can be performed by extraly reading the signal or limiting the picture to be displayed.

FIG. 14 (a) shows the output of the pickup 20 when normal reproduction is performed from the disc 10 of FIG. 13 (a), and FIG. 14 (b) shows its screen. As for the output of the pickup 20, the group low band component and the group high band component are G _f 0L, G _f 0H, G _f 1L, G _f 1 as shown in FIG.
H, G _f 2L, G _f 2H, ... Are read. Decrypt it 3
0, and the display screen P _d i is displayed as shown in FIG.
(I = 0~C-1) and a display screen group G _d i (i =
0, 1) is displayed.

FIG. 15 shows the output of the pickup 20 when high-speed reproduction at double speed is performed from the disc 10 of FIG. 13 (a), the output of the buffer 32 in FIG. 15 (b), and the output of the buffer 32 in FIG. 15 (c). _{Shows a} display screen P _d i. As shown in FIG. 9A, when the pickup 20 reads the group low frequency component G _f 0L, the pickup 20 immediately enters the seek operation without reading the group high frequency component G _f 0H, and the next group low frequency component G _The operation of reading _f 2L is repeated. From the buffer 32 at a time you leave out any read after read out the group low-frequency component G _f 0L as shown in FIG. (B), low-order group-frequency component G _f 2L
The operation of reading is repeated. The display screen P _d i at that time is a display screen group G _d i (i composed of a display screen P _d i (i = 0 to C-1) composed of C pictures as shown in FIG. = 0, 2) is displayed. Since the high frequency component is not reproduced during the high speed reproduction, the image quality is deteriorated as compared with the case of the normal reproduction of FIG. 14, but there is not much problem when confirming the display contents at the high speed.

FIG. 16 shows the output of the pickup 20 when high-speed reproduction at S speed is performed from the disk 10 of FIG. 13 (a), the output of the buffer 32 in FIG. 16 (b), and the output of the buffer 32 in FIG. 16 (c). _{Shows a} display screen P _d i. As shown in FIG. 9A, when the pickup 20 reads the group low frequency component G _f 0L, the pickup 20 immediately enters the seek operation without reading the group high frequency component G _f 0H, and the next group low frequency component G _The operation of reading _f SL is repeated. After reading out the group low-frequency component G _f 0L from the buffer 32 as shown in FIG. 7B, there is a period in which nothing is read for a while, and the next group low-frequency component G _f SL is read.
The operation of reading is repeated. The display screen P _d i at that time is a display screen group G _d i (i composed of a display screen P _d i (i = 0 to C-1) composed of C pictures as shown in FIG. = 0, S) is displayed.

Although the case of double speed is illustrated in FIG. 15 and the case of S speed is illustrated in FIG. 16 as described above, the number of skipped groups (i.e., the number of i) is changed even if the speed of high speed reproduction is changed. ), The image quality is not affected by its playback speed.

In the second embodiment, the case where the frequency component is divided into two layers and the high speed reproduction is performed by using only the low frequency component has been described. However, other than the use of the frequency component, a plurality of layers are included in the group. If recording is performed separately and only the layer with high priority is reproduced at the time of high-speed reproduction, the same reproduction can be performed.

Example 3. The circuit structure of the high-speed reproducing apparatus according to the third embodiment of the present invention is the same as that shown in FIG. In the first and second embodiments, when high-speed reproduction is performed at several tens of times, a considerably large number of screen groups are skipped. Therefore, a scene to be searched (target scene) is reproduced once at high speed. Does not always play in. Therefore, it is necessary to reproduce this target scene in high-speed reproduction in order to take advantage of the large double speed that is made possible by the first and second embodiments. In the third embodiment, the function of surely searching for a target scene is added to the functions of the first and second embodiments.

FIG. 17 shows how the system control unit 25 (FIG. 1) is controlled when the function of reliably searching the target scene is added to the functions of the first and second embodiments. FIG. 17A illustrates a case where the first high speed reproduction is performed by the functions of the first and second embodiments.
Recording time t1, t2, t3, ... (for example, 1 minute,
At 2 minutes, 3 minutes, ...), there is a period T in which the target scene occurs across time t2. Since the shaded portion is reproduced at high speed, the period T is not reproduced and the target scene is missed. Therefore, in the second search operation, the system control unit 25 stores the position information that is reproduced (searched) at high speed in the first time, and the first search is performed in the second search shown in FIG. Pickup control signal 52 indicating search position information so as to search between search locations
Is output to the pickup control unit 24. Then, in the second search by high speed reproduction, the target scene is reproduced at high speed as shown in FIG.

When the first and second high speed reproductions are combined, it means that the period indicated by the diagonal lines in FIG. 6C is reproduced. Therefore, when the target scene cannot be reproduced at high speed, the third scene is reproduced. Do the second search. At that time, the system control unit 25 causes the pickup control unit 25 to output the pickup control signal 52 indicating the position information of the non-shaded portion in FIG. 6C, that is, the portion not reproduced in the first and second high speed reproductions. To 24. The position information at the time of high speed reproduction is based on the time t at the time of recording in FIG.
It may be determined by referring to the identification (indicating order) information of the images included in the image data read by the pickup 20 from.

In the high-speed reproduction method described above,
Although skip is performed every time one encoded screen group G _c i is read, a plurality of encoded screen groups G _c i, G _c i + 1, ...
It is also possible to control to skip after reading.

[0043]

As is apparent from the above description, according to the present invention, it is not necessary to limit the speed of high-speed reproduction, and even if the reproduction speed is increased, the same image quality of natural motion can be obtained in high-speed reproduction. To be Therefore, the effect of the present invention is extremely large.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram showing an embodiment of the present invention.

FIG. 2 is a circuit configuration diagram showing the inside of a system control unit and a decoding unit, which are components of FIG.

FIG. 3 is an image signal diagram showing an image signal when the disc of FIG. 1 is reproduced normally and at high speed.

FIG. 4 is a group processing display diagram showing the relationship between the image signals subjected to the group processing and the screen display when high-speed reproduction is performed by the apparatus of FIG.

FIG. 5 is a group processing display diagram when a higher speed reproduction is performed than in the case of FIG.

6 is an arrangement of pixel blocks of a picture reproduced by the apparatus of FIG. 1, an arrangement of pixel blocks showing frequency components thereof, and a frequency component diagram thereof.

7 is a frequency component block diagram when DCT is performed on a pixel to be reproduced by the device of FIG.

FIG. 8 is a layout diagram of block low-frequency components and block high-frequency components reproduced by the apparatus of FIG.

9 is a pixel block frequency component arrangement diagram in which a pixel block of a picture reproduced by the device of FIG. 1 is divided into frequency components.

10 is a block diagram of a pixel block processed by the apparatus of FIG.
It is a frequency component figure which showed the division | segmentation method of the frequency component at the time of T.

FIG. 11 is a picture signal creation diagram showing how the apparatus of FIG. 1 creates a picture signal from a pixel block for each frequency component.

FIG. 12 is a screen group signal creation diagram showing a state in which a screen group signal is created from a picture for each frequency component in the apparatus of FIG. 1.

13 is a recording layout diagram when the screen group signal is recorded and arranged on the disc in the apparatus of FIG. 1. FIG.

14 is a screen group signal diagram when the screen group is reproduced from the disc of FIG. 13 at a normal speed.

15 is a screen group signal diagram when the screen group is reproduced from the disc of FIG. 13 at a speed twice as high as a normal speed.

16 is a signal diagram of a screen group when the screen group is reproduced from the disc of FIG. 13 at a high speed that is S times the normal speed.

FIG. 17 is a high-speed reproduction time relationship diagram showing a time relationship between a recording time and a reproduction screen when a target scene is searched for by high-speed reproduction from a disc.

FIG. 18 is a picture screen group diagram showing the relationship between a conventional picture and a screen group.

FIG. 19 is a screen code array diagram showing a relationship between a conventional screen display and an array of encoded screen signals.

FIG. 20 is a partial configuration diagram showing a part of a configuration when high-speed reproduction is performed from a disc by a conventional device.

21 is a pick-up operation diagram showing a pick-up operation in the case of performing high-speed reproduction with the apparatus of FIG.

22 is a high-speed reproduction diagram showing a relationship between an image signal and a screen when high-speed reproduction is performed by the apparatus of FIG.

[Explanation of symbols]

10 disk 11 track 12 arrow 20 pick-up 21 signal conversion unit 22 spindle motor 23 motor control unit 24 pickup control unit 25 system control unit 26 reproduction mode input unit 29 GOP period detector 30 decoding unit 32 buffer 33 decoder 40 display 51 motor control signal 52 pickup control signal 53 decoding control signal 54 reproduced position information 55 coded frame group 56 display screen unit 57 picture identification signal 58 reproduced mode signal Bi pixel block B _f i frequency component block B _f iL block low-frequency component B _f iH block high-frequency component G _c i coded screen group G _cp i high-speed coded screen group G _d i display screen group G _dp i high-speed display screen group G _f iL group low-frequency component G _f iH group high-frequency component Pi picture P _d i display screen P _f iL Picture low-frequency component P _f iH Picture high-frequency component

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical indication location H04N 5/783 J (72) Inventor Ryuji Nishito 4-36-19 Yoyogi, Shibuya-ku, Tokyo Stock company Within Graphics Communication Laboratories (72) Inventor Hironori Akasaka 4-36-19 Yoyogi, Shibuya-ku, Tokyo Within Graphics Communication Laboratories (72) Inventor Akihiro Nakajima 4-yoyogi, Shibuya-ku, Tokyo 36-19 No. 19 in Graphics Communications Laboratories, Inc. (72) Inventor Yusumi Wataya 4-36, Yoyogi, Shibuya-ku, Tokyo No. 36-19 in Graphics Communications Laboratories, Inc.

Claims (8)

[Claims] 1. A coded screen group (G _c i) consisting of a plurality of picture-compressed continuous pictures capable of reproducing a group of display screen groups (G _d i) including a plurality of pictures in a spiral and concentric circles. When a high-speed reproduction is performed by the pickup 20 from the medium disk (10) recorded by one of the above-described modes, a reproduction mode signal (58) for instructing the normal reproduction mode or the high-speed reproduction mode is obtained. Reproduction mode input processing (26) for reproducing the signal read from the medium disk (10) by the pickup (20) and reproduction position information of the encoded screen group (G _c i) and the pickup (20). A signal conversion process for converting into (54) is performed (21), and the display screen group (G _d ) is changed from the encoded screen group (G _c i).
i) is decoded and a picture identification signal (57) is output at the same time (30), and the reproduction mode signal (58), reproduction position information (54) of the pickup (20), and the picture identification signal (57). ), A system control process for outputting a motor control signal (51) for motor control, a pickup control signal (52) for pickup control, and a decoding process control signal (53) for decoding process control. (25), pickup control processing for moving the read position of the pickup (20) from the pickup control signal (52) (24), and from the motor control signal (51) to the medium disk (10).
A motor control process for controlling the rotation speed of a spindle motor (22) for rotating the motor is performed (23), and one of the non-consecutive encoded screen groups or one encoded screen group and the head of the following encoded screen groups A high-speed playback method for digitally compressed moving images that reads out data for several screens. 2. The high-speed reproduction method for a digitally compressed moving image according to claim 1, wherein, in the motor control processing, a speed at which the medium disc is rotated is higher than a rotation speed in a normal reproduction mode. 3. In the system control processing, the coded screen group (G _c i) recorded on the medium disk (10) is layered by image constituent components forming an image ( G _f iL, G _f iH), and in the high-speed reproduction mode, system control processing is performed so as to read data (G _f iL) of a layer having a high priority of the image constituents. High-speed playback method for moving images. 4. In the system control processing, when the operation in the high speed reproduction mode is performed subsequent to the operation in the high speed reproduction mode already executed, the encoded screen searched in the operation in the high speed reproduction mode already executed. The high-speed reproduction method for a digitally compressed moving image according to claim 1, wherein the pickup control signal (52) indicating the read-out position of the pickup (20) is output so as to avoid the group (G _c i). 5. A coded screen group (G _c i) consisting of a plurality of image-compressed continuous pictures capable of reproducing a group of display screens (G _d i) including a plurality of pictures is spirally and concentrically circled. When a high-speed reproduction is performed by the pickup 20 from the medium disk (10) recorded by one of the above-described modes, a reproduction mode signal (58) for instructing the normal reproduction mode or the high-speed reproduction mode is obtained. And a reproduction mode input means (26) for reproducing the signal read from the medium disc (10) by the pickup (20) and reproduction position information (Gci) of the encoded screen group ( _Gc i) and the pickup (20). Signal conversion means (21) for converting into 54), and the display screen group (G _d from the encoded screen group (G _c i).
i) and a decoding means (30) for simultaneously outputting the picture identification signal (57), the reproduction mode signal (58), the reproduction position information (54) of the pickup (20) and the picture identification signal (57). System control means (25) for outputting a motor control signal (51) for motor control, a pickup control signal (52) for pickup control, and a decoding process control signal (53) for decoding process control. ), Pickup control means (24) for moving the read position of the pickup (20) from the pickup control signal (52), and the medium disc (10) from the motor control signal (51).
And a motor control means (23) for controlling the rotation speed of a spindle motor (22) for rotating the same, and one of the non-continuous coded screen groups or one coded screen group and the head of the coded screen group that follows. A high-speed playback device for digitally compressed moving images that reads data for several screens. 6. The high-speed reproducing apparatus for digitally compressed moving images according to claim 5, wherein the motor control means rotates the medium disc at a speed higher than the rotation speed in the normal reproduction mode. 7. The system control means is one in which the coded screen group (G _c i) recorded on the medium disk (10) is hierarchized by image constituent components forming an image ( G _f iL, G _f iH), and the digitally compressed moving image according to claim 5, wherein system control is performed so as to read data (G _f iL) of a layer having a high priority of the image constituents in the high-speed reproduction mode. High speed playback device. 8. The coded screen searched in the already performed operation in the high speed reproduction mode when the system control means performs the operation in the high speed reproduction mode after the operation in the high speed reproduction mode already performed. The high-speed reproduction apparatus for a digitally compressed moving image according to claim 5, wherein the pickup control signal (52) indicating the read position of the pickup (20) is output so as to avoid the group (G _c i).