KR19980075477A - How to play angles on DVD system - Google Patents

Abstract

The present invention relates to an angle reproduction method of a DVD system, comprising: an angle reproduction method of a DVD system for reproducing a disc containing first to Nth (N; positive integer) angles corresponding to each direction of a camera, wherein the disc is reproduced by: A first step of detecting and storing the number of angles recorded on the disc when is mounted on the DVD system; A second step of reproducing and storing only screens corresponding to a Y (Y = positive integer) th I-frame in each of the first to Nth angles; A third step of displaying the screens corresponding to the Y-th I-frame in multiple screens and then clearing the screens corresponding to the Y-th I-frame stored in step 2; And a fourth step of repeatedly performing the second and third steps while increasing the Y value by one.

Description

How to play angles on DVD system

The present invention relates to a digital video disc system (hereinafter referred to as a DVD system), in particular, an angle for displaying an angle screen shot by a camera in multiple directions on a multi-screen, in particular for a scene. It relates to a regeneration method.

Normally, DVD discs contain angle information photographed by the camera in various directions for a scene. Therefore, when the viewer selects angle information of a predetermined angle from among angle information photographed at various angles, there is an advantage in that only the screen of the corresponding angle can be selectively viewed.

That is, as shown in FIG. 1, the DVD disc records angles photographed in respective directions, for example, front, rear, left, and right directions, for a predetermined scene of the camera.

Therefore, when the viewer selects the right angle, for example, the DVD system reproduces only tracks containing the right angle so that the camera can selectively view only the screen shot in the right direction for a certain scene.

However, in the conventional DVD system, when an angle in a specific direction is selected, only the screen of the angle is reproduced, so that the camera cannot simultaneously view the screen shot in each direction.

Accordingly, an object of the present invention is to provide an angle reproducing method that allows a camera in a disc to display screens taken in each direction at the same time in multiple screens, so that a screen corresponding to each direction of each camera can be simultaneously viewed.

The present invention provides an angle playback method of a DVD system which plays back a disc containing first to Nth (N) positive angles corresponding to each direction of a camera in order to achieve the above object. A first step of detecting and storing the number of angles stored in the disk when mounted on the disk; A second step of reproducing and storing only screens corresponding to a Y (Y = positive integer) th I-frame in each of the first to Nth angles; A third step of displaying the screens corresponding to the Y-th I-frame in multiple screens and then clearing the screens corresponding to the Y-th I-frame stored in step 2; And a fourth step of repeatedly performing the second and third steps while increasing the Y value by one.

1 is a view showing a state in which angles are recorded on a disk;

2 is a block diagram of a DVD system;

3 is a detailed flowchart showing a preferred embodiment of the angle reproduction method of the present invention;

4 is a multi-screen view displayed in accordance with a preferred embodiment of the present invention.

<Description of the code | symbol about the principal part of drawing>

100: disc 110: DVD player

120: memory 130: screen multiplexer

140: key input unit 150; System control

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

Generally, images and audio are compressed in a DVD disc. In particular, image information is compressed by a moving picture compression standard called MPEG (Motion Picture Expert Group) -2. MPEG-2 is a high-combination standard for various image coding technologies. Hybrid coding combines motion compensation DPCM (differential pulse coding), two-dimensional DCT (discrete cosine transform), quantization of DCT coefficients, variable-length coding (VLC), and the like. The technique is used by default.

At this time, the motion compensation DPCM estimates the motion of the object between the current frame and the previous frame and predicts the current frame according to the motion of the object to produce a differential signal representing the difference between the current frame and the predicted value. Staffan Ericzzon's Fixed and Adaptive Predictors for Hybrid Predictive / Transform Coding, IEEE Transactions on Communication, COM-33, NO.12 (1985, December), or A Motion Compensated Interframe Coding Scheme for Television Picture, IEEE by Ninomiy and Ohtsuka It is well described in Transations on Communication, COM-30, NO.1 (1982, January).

On the other hand, the type of picture is an I-frame to which only interframe coding is applied according to the above-described motion estimation method, and forward motion estimation / compensation from a previous I-frame or P-frame. A P-frame that is predictively encoded by B, and a B-frame that is bidirectionally motion-compensated from a previous or subsequent I-frame or a P-frame and predictively coded, and is used as a reference for predictive coding other frames, In other words, I-frame and P-frame are called anchor frames.

In particular, since only intra-frame coding is applied to an I-frame, it can be said that the loss of data on the picture is the smallest.

Therefore, the present invention is to detect only the screen of each I-frame for each angle of the disk, and to display the screen of the I-frame corresponding to each direction in multiple screens.

FIG. 2 is a block diagram of a DVD system for performing an angle reproducing method according to the present invention. The disc 100 and angle information corresponding to the shooting direction of the camera are read at predetermined intervals. And 120 to store screens corresponding to I-frames at respective angles corresponding to the shooting directions of the cameras provided from the DVD player 110, and I- corresponding to each direction. The screen multiplexer 130 allows the screens of the frames to be displayed in multiple screens, the key input unit 140 for providing a key signal for angle screen multiplexing, and the I signal stored in the memory 120 when a key signal for angle screen multiplexing is provided. And a system controller 150 for controlling the screens of the frames to be displayed on multiple screens.

3 is a detailed flowchart showing a preferred embodiment of the angle selection method of the present invention, which will be described with reference to the DVD system of FIG.

First, when the disk 100 is mounted on the DVD system (S1), the system controller 150 determines whether the mounted disk 100 is the disk 100 containing the angle information (S2).

In the case of the disc 100 in which the angle information is not recorded, the system controller 150 controls the DVD player 110 to be kept in the standby state (S3), and thereafter, a predetermined function key is input from the key input unit 140. When input, the DVD player 110 is controlled to perform an operation corresponding to the input function key. However, in the case of the disk 100 in which the angle information is stored, the system controller 150 searches for how many angles are formed and stores the number of retrieved angles M in a memory inside the system controller 150. (S4) The DVD player 110 is controlled to maintain the standby state (S5).

In this standby state, when the viewer provides the multi-angle playback key signal to the system controller 150 using the key input unit 140 (S6), the system controller 150 controls the DVD player 110 to control the disc ( The first angle N = 1 recorded first among the angles recorded in the track 100 is searched for (S7, S8).

The DVD player 110 searches for the first angle N = 1 among the angles recorded in the track of the disc 100 under the control of the system controller 150.

When the search for the first angle N = 1 is completed (S9), the system control unit 150 controls the DVD player 110 to play the first angle N = 1 (S10). The screen corresponding to the I-frame among the first angles is stored in the memory 120 (S11 and S12).

The DVD player 110 reads one angle (N = 1) data contained in the disc 100 under the control of the system controller 150 to perform digital signal processing and MPEG decoding, but the first angle of the first angle in the decoding process. Search for screen data (N = 1, Y = 1) corresponding to the first I-frame.

If the screen data (N = 1, Y = 1) of the first I-frame of the first angle is found in the decoding process, the DVD player 110 notifies the system controller 150 of the search result, The screen data (N = 1, Y = 1) of the first I-frame is provided to the memory 120. Therefore, the memory 120 may store the screen data (N = 1, Y = 1) of the first I-frame of the first angle (S12).

On the other hand, if the system controller 150 is informed that the screen data (N = 1, Y = 1) of the first I-frame of the first angle has been retrieved, the system controller 150 searches for a start position of the second angle (N = 2). The player 110 is controlled (S13, S14, S8).

When the search is completed (S9), the system controller 150 controls the DVD player 110 to play the second angle (N = 2), while the first I-frame of the second angle of the played angle screen is displayed. The screen data (N = 2, Y = 1) is stored in the memory 120 (S10, S11, S12).

The DVD player 110 reads out the second angle screen (N = 2) data contained in the disc 100 under the control of the system control unit 150 to perform digital signal processing and MPEG decoding, and during the decoding process, the second angle screen (N = 2) data is read. Retrieves the screen data (N = 2, Y = 1) of the first I-frame in.

If the screen data (N = 2, Y = 1) of the first I-frame of the second angle is found in the decoding process, the DVD player 110 notifies the system control unit 150 of the search result, The screen data (N = 2, Y = 1) of the first I-frame is provided to the memory 120. Therefore, the screen data (N = 2, Y = 1) of the first I-frame of the second angle will be stored in the memory 120.

After all the screen data of the first I-frames of the first to Nth angles stored in the disk 100 are stored (N = M, Y = 1) (S13), the system controller 150 stores the memory. While controlling the DVD player 110 and the screen multiplexer 130 so that the screen data of the I-frame stored in the 120 is displayed in multiple screens (S15), the memory 120 is cleared (S16). .

Accordingly, the screen data stored in the memory 120 is provided to the screen multiplexer 130 via the DVD player 110, and the screen multiplexer 140 is configured to display the screens corresponding to the respective shooting directions of the camera in multiple screens. The signal is processed and output.

Therefore, the screens corresponding to the respective shooting directions of the camera will be displayed as multiple screens as shown in FIG. 4.

Thereafter, the system controller 150 controls the DVD player 110 so that only the screen data (Y = 2) of the second I-frame of the first to Nth angles (N = 1 to N = M) is stored in memory ( The DVD player 110 is controlled to be stored at 120 (S8 to S13).

The DVD player 110 stores the screen data (Y = 2) of the second I-frames of the first to Nth angles (N = 1 to N = M) through the processes S8 to S13 described above. Save it to After all of the picture data (Y = 2) of the second I-frame of the first to Nth angles (N = 1 to N = M) are stored in the memory 120 (N = M, Y = 2) The system controller 150 controls the DVD player 110 and the screen multiplexer 130 so that screen data of I-frames stored in the memory 120 are displayed in multiple screens (S14) and clears the memory 120. (clear) (S15, S16, S17, S18).

Accordingly, the screen data stored in the memory 120 is provided to the screen multiplexer 130 via the DVD player 110, and the screen multiplexer 140 is configured to display the screens corresponding to the respective shooting directions of the camera in multiple screens. The signal is processed and output.

As such, in the present invention, the screens of the first I-frames of the first to Nth angles (N = 1 to N = M) are displayed in multiple screens, and then again the first to Nth angles (N = 1). Through the screens of the first I-frames of the first to Nth angles (from N = 1 to N = M) through the process of displaying the screens of the second I-frames of N to M) in multiple screens. The screens of the last I-frame are sequentially displayed in multiple screens.

Subsequently, after the first I-frames of the first to Nth angles (N = 1 to N = M) are sequentially displayed in multiple screens from the screens of the first I-frame to the screens of the last I-frame (S17), the system control unit ( 150 stops the operation of the DVD player 110 (S19).

As described above, the present invention has the effect of simultaneously displaying the screen shot in each direction by the camera in the disc in multiple screens, the screen corresponding to each direction of each camera at the same time.

Claims (1)

In the angle playback method of the DVD system for playing a disc containing the first to N (N; positive integer) angles corresponding to each direction of the camera: A first step of detecting and storing the number of angles recorded on the disc when the disc is mounted on the DVD system; A second step of reproducing and storing only screens corresponding to a Y (Y = positive integer) th I-frame in each of the first to Nth angles; A third step of displaying the screens corresponding to the Y-th I-frame in multiple screens and then clearing the screens corresponding to the Y-th I-frame stored in step 2; And a fourth step of repeating the second and third steps while increasing the Y value by one.