KR19980075476A - How to choose the angle of DVD system - Google Patents

Abstract

The present invention relates to an angle selection method of a DVD system, and to a DVD system for selectively playing only an angle screen of a specific direction on a disc containing angle block information composed of a plurality of angle screens corresponding to each direction of the camera for each predetermined track section. A method of selecting an angle comprising: searching for an angle block recorded first on a track of the disc when the disc is mounted on the DVD system; Reproducing and storing only the angle screens corresponding to the I-frames among the angle screens corresponding to each direction of the camera in the angle block recorded first on the track of the disc; And displaying only the angle screens corresponding to the I-frame on a multi-screen and then selecting a predetermined direction, reproducing only the angle screen in the selected direction.

Description

How to choose the angle of DVD system

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an angle selection method in which an angle selection can be made into a screen, particularly in a digital video disc system (hereinafter referred to as a DVD system).

Typically, tracks of DVD discs contain angle block information for each predetermined section. The angle blocks are composed of angle screens shot by cameras in various directions for a scene.

Therefore, when the viewer selects an angle screen having a predetermined angle among angle screens photographed at various angles, the viewer can selectively view only the angle screen of the corresponding angle.

That is, as shown in FIG. 1, the DVD disc includes angle blocks R for each predetermined section of the disc track T, and each angle block has a direction, for example, before and after a certain scene of the camera. Afterwards, angle pictures taken in the left and right directions are recorded for several seconds.

Therefore, when the viewer selects, for example, the right angle screen, the DVD system selectively plays only the right angle screen.

In such angle reproduction, conventionally, in order to select an angle screen in a predetermined direction, a number key corresponding to the angle screen number is input or a constant angle screen number is selected by looking at a menu screen displayed by letters.

Accordingly, the conventional angle screen selection method is a method of selecting an angle screen in a predetermined direction without viewing angle screens in each direction, and thus information for selecting an angle screen is limited.

Therefore, when the viewer wants to select an angle screen in a certain direction, the present invention provides an angle selection method that displays an angle screen in each direction so that the viewer can select an angle direction by viewing angle screens corresponding to each direction of the camera. Has its purpose.

In order to achieve the above object, an angle selection method of a DVD system selectively playing only an angle screen of a specific direction on a disc containing angle block information including a plurality of angle screens corresponding to each direction of a camera for each predetermined track section. Searching for an angle block recorded first on a track of the disc when the disc is mounted on the DVD system; Reproducing and storing only the angle screens corresponding to the I-frames among the angle screens corresponding to each direction of the camera in the angle block recorded first on the track of the disc; And displaying only the angle screens corresponding to the I-frame on a multi-screen and then selecting a predetermined direction, reproducing only the angle screen in the selected direction.

1 is a view showing a state in which an angle block is recorded on a disk,

2 is a block diagram of a DVD system;

3 is a detailed flowchart illustrating a preferred embodiment of the angle selection 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 I-frame only intra-frame encoding is applied, it can be said that the loss of data on the picture is the least.

Therefore, the present invention detects only the respective I-frames for the angle screens in each direction constituting the angle block of the disc, and displays the angle screens of the I-frames corresponding to each direction in multiple screens, thereby allowing the viewer to view each angle screen. Let's look at them and select the angle direction.

2 is a block diagram of a DVD system for performing an angle selection method according to the present invention, in which an angle block is recorded on a track at predetermined intervals, and a DVD for reading and playing information contained in the disk 100. FIG. The memory 110 stores angle screens of the I-frames corresponding to each direction in the angle block provided from the player 110, the DVD player 110, and the angle screens of the I-frames corresponding to each direction are multi-screen. When the screen multiplexer 130 to display the key input unit 140 provides a key signal for selecting an angle, and a key signal for selecting an angle is provided, angle screens of I-frames stored in the memory 120 are converted into multiple screens. And a system controller 150 to control the display.

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 controls the DVD player 110 to search whether the angle block is recorded on the track of the disk 100 (S2).

In the case of the disc 100 in which the angle block is not recorded, the system controller 150 controls the DVD player 110 to be kept in the standby state (S3), and then 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 disc 100 in which the angle block is stored, the system controller 150 searches for how many angle screens N each angle block is composed of (S4), and the number of angle screens that have been retrieved (M4). ) Is stored in a memory inside the system controller 150 (S5).

Thereafter, the system controller 150 controls the DVD player 110 to search for the first angle block among the angle blocks recorded on the track of the disc 100 (S6).

The DVD player 110 searches for the first angle block among the angle blocks recorded in the track of the disc 100 under the control of the system controller 150.

When the search for the angle block is completed (S7), the system controller 150 controls the DVD player 110 to play back the angle screen (N = 1) recorded first among the angle screens in the angle block. In operation S10, the angle screen corresponding to the I-frame among the reproduced angle screens is stored in the memory 120 (S10).

The DVD player 110 reads out the first angle screen (N = 1) data recorded first in the angle block recorded among the first angle blocks recorded on the disc 100 under the control of the system controller 150, and then performs a digital signal. While processing and MPEG decoding are performed, first angle picture data belonging to an I-frame is retrieved in the decoding process.

When the first angle screen data of the I-frame is searched in the decoding process, the DVD player 110 notifies the system controller 150 of the search result, and provides the memory 120 with the first angle screen data of the I-frame. do. Therefore, the first angle screen data of the I-frame is stored in the memory 120 (S10).

Meanwhile, when notified that the first angle screen data of the I-frame has been retrieved, the system controller 150 controls the DVD player 110 to search for the start position of the second recorded second angle screen N = 2.

When the search is completed, the system controller 150 controls the DVD player 110 to play the second angle screen (N = 2) recorded second, while the angle screen of the I-frame of the played angle screen is displayed. To be stored in the memory 120.

The DVD player 110 reads out the second angle screen (N = 2) data recorded second in the angle block recorded first among the angle blocks recorded on the disc 100 under the control of the system controller 150, and then performs a digital signal. While processing and MPEG decoding are performed, the second angle picture data of the I-frame is retrieved in the decoding process.

If the second angle screen data of the I-frame is found during the decoding process, the DVD player 110 notifies the system controller 150 of the search result, and provides the memory 120 with the second angle screen data of the I-frame. do. Accordingly, the second angle screen data of the I-frame may be stored in the memory 120.

As such, the system controller 150 sequentially plays the angle screens M in the angle block recorded first among the angle blocks recorded on the disk 100, and the angle screen data of the I-frame of each angle screen is stored in memory. To be sequentially stored at 120.

After all of the angle screen data of the I-frame for each angle screen in the angle block recorded on the disk 100 is stored in the memory 120 (N = M) (S11), the system controller 150, the DVD player 110 is controlled to enter the standby state by controlling the DVD player 110 (S12).

Subsequently, when the viewer provides the angle selection key signal to the system controller 150 using the key input unit 140 (S13), the system controller 150 stops multiple angle screens of the I-frames stored in the memory 120. The DVD player 110 and the screen multiplexer 130 are controlled to be displayed on the screen (S14).

The angle screens stored in the memory 120 are provided to the screen multiplexer 130 via the DVD player 110, and the screen multiplexer 140 processes and outputs the angle screens to be displayed as multiple still screens.

Therefore, angle screens photographed in each direction of the camera will be displayed in multiple screens as shown in FIG. 4.

The viewer provides the system control unit 150 with a key signal for selecting an angle screen in a predetermined direction with reference to the multiple still screen as shown in FIG. 4. When a key signal for selecting an angle screen in a predetermined direction is provided from the key input unit 140 (S15), the system controller 150 controls the DVD player 110 to reproduce only the angle screen in the selected direction (S16).

The DVD player 110 reads the information data contained in the track of the disc 100, and when data of a predetermined angle block is read out during playback, only the angle screen in the direction indicated by the system controller 150 in the MPEG decoding process is read. Selectively decode and output.

As described above, in the present invention, when a viewer wants to select an angle in a certain direction, the viewer selects an angle in a certain direction by searching for and displaying only the I-frames of each angle screen in the angle block. There is an effect that can provide more information.

Claims (1)

In the angle selection method of the DVD system for selectively playing only the angle screen of a specific direction on a disc containing angle block information consisting of a plurality of angle screens corresponding to each direction of the camera for each predetermined track section: Searching for an angle block recorded first on a track of the disc when the disc is mounted on the DVD system; Reproducing and storing only the angle screens corresponding to the I-frames among the angle screens corresponding to each direction of the camera in the angle block recorded first on the track of the disc; And displaying only the angle screens corresponding to the I-frames as multiple still pictures, and then playing back only the angle screens in the selected direction.