KR950010338B1 - Digital moving image high speed control system - Google Patents

Abstract

The control device for reproducing digital moving picture in a high speed comprises a digital storing unit for storing a decoded digital picture group signal and control information corresponding to the picture group signal; a controller of reading the intra picture group signal having the control information which can respond to the high speed reproduction and high speed searching mode among the intra, predictive and bidirectional pictures stored at the digital storing unit and controlling the output of the intra picture group signal; and a memory for storing the intra picture group signal based on a control signal and supplying the stored intra picture group signal to a digital signal processing unit.

Description

Digital video high speed playback controller

1 is a block diagram schematically showing a control apparatus for digital video high-speed playback according to the present invention.

FIG. 2 is an internal configuration diagram of the digital storage medium shown in FIG.

3 is a diagram showing an image reproduction (display) procedure in an MPEG system.

* Explanation of symbols for main parts of the drawings

110: digital storage medium 120: controller

130: memory

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a controller for digital video fast playback, and more particularly, to a controller for digital video fast playback capable of high speed playback of a digital video signal stored in a storage medium.

Currently, digital audio (CD, DAT, DCC, EMD), CDG, CD-1, CD-ROM, etc. usually have a high speed search function. However, the video device such as the CDG, CD-I, CD-ROM, etc., but the high-speed playback of the static image signal (static image) is represented by the display device, but this has the disadvantage of showing only the static (still) image.

Therefore, digital video devices such as high-definition television (HDTV), video phone (video pnone), etc. currently being developed are made up of video, and store digital signals provided by such video devices through any digital video recording media (disk, take). A device capable of reproducing the stored video data at high speed is being studied by experts in the art.

Accordingly, an object of the present invention is to provide a control apparatus for digital video high-speed playback that enables high-speed playback of a digital video signal stored in a digital storage medium.

According to the present invention for achieving the above object, I (intra), P (prediction), B (bi-directional) images constituting the image sequence in the MPEG system stored in a predetermined medium is forward prediction and bi-directional prediction A control apparatus for high speed reproduction at predetermined intervals of a video sequence, comprising: a digital storage medium (110) for storing a hatched digital video sequence signal input from an external encoding device and control information corresponding to the video sequence signal; It is possible to cope with the fast playback and fast search modes among the images I (intra), P (prediction), and B (bidirectional) stored in the digital storage medium 110 in the fast playback and fast search modes applied from the outside. A controller 120 for reading an I (intra) image string signal having control information and controlling the output of the read I (intra) image string signal; and a control signal for recording provided from the controller 120; The I (intra) image string signal provided from the digital storage medium 110 is stored, and the stored I (intra) according to the image string control signal for reading provided from the controller 120. And a memory 100 for providing an image string signal to an external digital signal processing apparatus.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a control diagram for digital video high-speed playback according to the present invention, and FIG. 2 is an internal configuration diagram of the digital storage medium shown in FIG.

Referring to FIG. 1, the controller 100 for digital video high-speed playback of the present invention includes a digital storage medium 110, a controller 120, and a memory 130.

In the digital storage medium 110, a digital image (I, B, P, etc.) encoded by an external encoding apparatus includes a digital image string signal (112 in FIG. 2) and control information for the image string signal (111 in FIG. 2). The memory 130 stores an image string signal corresponding to the control information (111 of FIG. 2) read based on the control signal of the controller 120, and is stored to be reproduced in the order shown in FIG. Is provided.

The controller 120 performs a fast playback mode and a fast search mode among the images I (intra), P (prediction), and B (bidirectional) stored in the digital storage medium 110 in the fast playback and fast search modes applied from the outside. And read out the I (intra) image string signal having control information corresponding to the control signal, and control the output of the read I (intra) image string signal.

The memory 130 stores an I (intra) video string signal provided from the digital storage medium 110 based on a control signal for recording provided from the controller 120, and reads the read provided from the controller 120. And an I (intra) image string signal stored according to the image string control signal for the external digital signal processing apparatus.

Referring to FIG. 2, the digital storage medium 110 shown in FIG. 1 includes a first region (control information 111 for image string signals) and a second region (digital image string signals 112). Stored.

First, the control information 111 for the image sequence signal, which is the first region, refers to information required to control the flow of the digital image sequence signal, and may be regarded as a signal for performing high speed image reproduction. Such control information can also normally be detected in the process of restoring as a digital video sequence signal through information source incubation.

Next, the digital image string signal 112, which is the second region, is composed of a sequence of image signal sequences and additional information representing characteristics of the image signal sequence, wherein the additional information includes speed, display size, and configuration information of the image signal sequence. And the like.

Referring to FIG. 3, a procedure of reproducing (displaying) moving picture expert group (MPEG) image information stored in the digital storage medium 110 is illustrated.

The preferred embodiments of the present invention will be described in detail with reference to FIGS. 1, 2 and 3 described above.

As described above, the present invention is a device for controlling video streams stored in the digital storage medium 110 shown in FIGS. 1 and 2 for high speed playback using control information.

As an international standardization organization for generating digital image string signals, MPEG is composed of intra (I) images, predictive (P) images, and bidirection (B) images.

In other words, the decoding (transmission) order in the MPEG system is I1, P2, B3, B4, P5, B6, B7, P8, B9,... It is made sequentially as shown in the, and the reproduction order is made in the order shown in FIG.

In the MPEG system having the image structure as described above, the I (intra) image is used in an encoding method that removes only the complexities from the spatial direction of the current original image, and the P (prediction) and B (bidirectional) images are separated from the spatial direction. Together, it is used for an encoding method for removing redundancy in the time axis direction.

Also, in case of P (prediction) image, the difference signal and motion information between the current original image and the motion compensation predictive image are encoded, and in the case of B (bidirectional) image, P (prediction) image of I (intra) image is encoded. Play after interpolation.

In the video sequence of the MPEG system described above, since the I (intra) image currently has information of the original image, it can be directly played without other images, whereas the P (prediction) and B (bidirectional) images must be I (intra). ) Playback is possible only through video or P (prediction) video.

In addition, as described above and shown, since the structure of the MPEG video sequence has a much smaller number of I (intra) images than the number of B (bidirectional) or P (prediction) images, such a high-speed playback of such image sequence reproduces only a specific image and the remaining images. By jumping to (B and P), more efficient high speed playback can be achieved.

Referring to FIG. 3, when only an I (intra) image is played back, high-speed playback is possible at a speed approximately 10 times that of the normal playback speed.

That is, after playback of 11 (first intra) image, playback of 111 (second intra) at the time of playback of the B2 (bidirectional) image, and playback of 121 (third intra) from the viewpoint of the B3 (bidirectional) image By repeating a series of processes, high speed playback is possible.

However, in order to implement the present invention, I1, I11, I21... The position of the I image of the camera, etc. must be known in advance, and the distance (sec) between each of the I (I1-I11, I11-I21) images must be shorter than the seek time of the digital storage medium 110. .

The search time is defined as a random access time of the digital storage medium 110.

As described above, the distance between the current position of the I (intra) image and each I (intra) image is detected in the information source encoding process of the image information, and as control information in the first region 111 of the digital storage medium 110, Stored.

The following equations (1) and (2) are preferred embodiments of the present invention, which calculate the distance ID (i, j) between the position I A of the I (intra) image and each I (intra) image. .

ID (i, j) = (Ii-IIj) × (recording unit of digital storage medium) × (digital storage medium speed)... … … (One)

IAi = IAj + ID (i, j). … … … … … … … … … … … … … … … … … … … … … … … … … … (2)

Where i, j is an integer other than 0, ID (i, j) is the I-th and j-th I (intra), the distance (sec) between the images, and Ii and Ij are the i- and jth I-images (Byte) ).

In addition, the recording unit of the digital storage medium represents the recording unit per byte (recording unit / BYte), the speed of the digital storage medium represents the position per recording unit (sec / recording unit), and IAi and IAj are the i-th and j-th I (Intra) Indicates the position (sec) of the image.

The distance between the position of the I (intra) image and the I (intra) image calculated from Equations (1) and (2) is stored in the control information (reading) of the first region 111 of the digital storage medium 110. In this case, the controller 120 controls the controller 120 based on the control information (reading) for high speed playback.

For example, in the fast playback or fast search mode during the normal playback operation of the video sequence, the controller 120 determines the I (I) based on the control information (111 in FIG. 2) for the digital video sequence signal encoded in the digital storage medium 110. Intra) video string signal application is read.

That is, the control information indicating the first I (intra) image that is closest to the control signal for selecting the fast playback or fast search function is input to the controller 120.

Here, the first I (intra) image string signal read is provided to the memory 130, and also reads the control information indicating the I (intra) image of the next order and the read I (intra) image. The thermal signal is provided to the memory 130 as described above.

As such, the reading of the I (intra) image and providing the I (intra) image string signal to the memory 100 continue until a control signal for stopping the high speed reproduction or the high speed search function is provided to the controller 120.

Therefore, only the I (intra) video signal among the I (intra) video signal, the P (prediction) video signal and the B (bidirectional) video signals is read, and then the read I (intra) video signal is read into the memory 130. In the memory 130, the I (intra) image string signal, which is input and temporarily stored, is sequentially read and output to an external digital signal processor, thereby enabling high-speed playback and high-speed search.

In addition, the memory 130 provides a control signal informing the controller 120 of the current storage capacity status, and when the storage capacity is larger than the set capacity, the controller 120 from the digital storage medium 110. The image string signal provided to the memory 130 may be temporarily blocked.

For example, assuming that the control signal for selecting the fast playback or fast search function is the B9 point in FIG. 3, the I11 in FIG. 3 is based on the result of reading the control information (FIG. 111) continuing from this B9 point. When the (intra) image is read, the read digital image string signal is provided to the memory 130.

The next I21 position is obtained without reading a plurality of P (prediction) and B (bidirectional) images based on the distance information (e.g. IAj = IAj + ID (i, j)) that has been determined at the time of encoding at the position [1]. After that, the I21 (intra) image string signal is provided to the memory 130.

Therefore, in memory 130, I11, I21,... The image is output to the digital signal processing device.

As described above, in the present invention, an external digital signal processing apparatus detects only an I (intra) image among images (I, P, B, etc.) stored in the digital storage medium 110 during high-speed playback or high-speed search. By outputting as, there is an effect that high speed playback and high speed search are possible.

Claims (1)

A control apparatus for high-speed playback of I (intra), P (prediction), and B (bidirectional) images constituting a video sequence at predetermined intervals in the order of forward prediction and bidirectional prediction in an MPEG system stored in a predetermined medium. A digital storage medium 110 for storing an encoded digital video string signal input from an external encoding device and control information corresponding to the video string signal; Corresponding to the fast playback and fast search mode among the images I (intra), P (prediction), and B (bidirectional) stored in the digital storage medium 110 in the fast playback and fast search modes applied from the outside. A controller (120) for reading the I (intra) image string signal having possible control information and controlling the output of the read I (intra) image string signal; The I (intra) image string signal provided from the digital storage medium 110 is stored based on a control signal for recording provided from the controller 120, and the image for reading provided from the controller 120 is stored. And a memory (100) for providing the stored I (intra) image string signal to an external digital signal processing device according to a column control signal.