KR20000044731A - Apparatus for processing prior orders of caption windows in atv - Google Patents

Abstract

PURPOSE: An apparatus for processing prior orders of caption windows in ATV(Advanced Television) is provided to display caption windows of N number on a screen according to prior orders. CONSTITUTION: An apparatus for processing prior orders of caption windows in ATV comprises a video information detection portion(10), an MPEG decoding portion(20), a caption information detection portion(30), a window division portion(40), a control portion(50), a memory(90), window processors of N number(60), a graphic processor(70), and a video processing portion(80). The video information detection portion provides a video packet stream from an ATV transmission stream. The MPEG decoding portion performs MPEG decoding for the video packet stream. The caption information detection portion detects a caption packet from the video packet stream. The window division portion detects caption window information and caption window ID(IDentifiers) according to caption windows of N number from the caption packet. The control portion controls storing of the caption window ID according orders of a high prior order to a low prior order. The memory stores the caption window ID of the high prior order to the low prior order according to a control of the control portion. The window processors of N number provides control commands for forming new caption window screens. The graphic processor forms caption window graphics corresponding to the control commands. The video processing portion processes and displays the caption window graphics on a screen.

Description

AT's Caption Window Priority Processing Unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caption window priority processing apparatus of an ATV (Advanced Television) system. In particular, the caption of an ATV displayed according to the caption window priority when displaying N caption windows on one screen A window priority processing apparatus.

The ATV system is a system that compresses and transmits digital video and audio data using a predetermined compression algorithm, for example, a hybrid encoding algorithm, and restores the video and audio data, which is compressed and transmitted, to the original data to serve a viewer. In such an ATV system, program information, data information, and control information are multiplexed to form a predetermined packet stream, for example, a packet stream in units of 188 bytes, and then carried on a carrier wave.

The program information indicates, for example, TV programs provided by each broadcaster for the purpose of being broadcast to subscribers. The program information includes video information, user information such as caption data and audio information, and the data information is defined according to a service provider. Includes information that becomes

The control information includes a program ID and program guide information such as channel ID, program name, caption service presence, and program grade necessary for demultiplexing and reconfiguring program information or data information of a selected channel from a packet stream transmitted on a carrier. It is usually written in PMT (Program Map Table).

Therefore, based on the control information included in the packet stream, the receiving side of the ATV automatically tunes to the carrier including the program of the selected channel, and then demultiplexes only the program information of the channel selected from the multiplexed and transmitted packet stream. By reconstructing, program information is provided to the viewer.

1 illustrates a structure of a demultiplexed data stream when a subscriber selects a specific channel. As shown in Fig. 1, a data stream includes program information (video information and audio information) and control information of a selected channel.

As shown in FIG. 1, user information such as caption information is substantially included in the video information.

The caption information includes various commands for configuring the caption screen, such as the size of the caption window to be displayed on the screen, the position to be displayed on the screen, the caption display format, and the like. For example, the window command and the pen Commands, synchronous commands, text commands, and so on.

In this case, the window command indicates the ID, size, position, and color of the window, and the pen command acts on the size of the character, font style, character style, foreground and background color of the character. To act. Synchronous commands control data interpretation rates, and text commands are not specifically defined.

Such caption information may be displayed in a maximum of eight windows on one screen. Therefore, the caption information substantially exists in the form of a packet stream in which up to eight caption window information are multiplexed. When eight caption windows are simultaneously displayed on one screen, the caption information overlaps each other to accurately display caption information. There was a case of not being.

The present invention has been made in view of the foregoing, and an object of the present invention is to display caption windows when displaying caption windows on a screen by considering priority of newly defined caption windows among N caption windows. The present invention relates to an ATV caption window priority processing apparatus for preventing overlapping between windows.

In order to achieve the above object, the present invention provides an ATV transport stream, which processes N caption window information for each priority, including commands such as window size, position to be displayed on the screen, and text display form, by priority. A caption window priority processing apparatus. A video information detector for providing a video packet stream from the ATV transport stream; An MPEG decoding unit for MPEG decoding and providing a video packet stream provided by the video information detecting unit; A caption information detector for detecting and providing caption packets from a video packet stream provided by the video information detector; A window separator for detecting and providing caption window information and a caption window ID corresponding to each of the N caption windows from the caption packet provided by the caption information detector; And store the caption window ID provided by the window separator in order of high priority to low priority. A controller which controls to process a caption window according to the stored priority when defining a new caption window; A memory for storing the caption window ID in order of high priority to low priority under the control of the controller; It is configured to correspond to each of the caption window information provided by the window separator, and operated according to the priority provided by the control unit to interpret the commands included in the caption window information to form the newly defined caption window screen. N window processors to provide control commands for the system; A graphics processor configured to form caption window graphics corresponding to control commands provided by the N window processors; And a video processor configured to process the formed caption window graphic on the MPEG decoded video information to display on the screen.

1 is a structural diagram of an ATV bit stream demultiplexed when a subscriber selects a specific channel in general.

2 is a block diagram of an ATV system for caption window priority processing method according to the present invention;

3 is a flowchart of a process for performing a caption window priority processing method of an ATV according to the present invention.

<Description of the symbols for the main parts of the drawings>

10: video information detection unit 20: MPEG decoder

30: caption information detection unit 40: window separation unit

50: control unit 60: window processor

70: graphics processor 80: video processing unit

90 memory

Hereinafter, with reference to the accompanying drawings will be described in detail the operation of the preferred embodiment according to the present invention.

2 is a block diagram showing the configuration of an ATV caption window priority processing apparatus according to the present invention, in which the video information detector 10 and the video information detector 10 provide a video packet stream of a predetermined channel from an ATV transport stream. The MPEG decoder 20 provides MPEG decoding of the provided video packet stream and the caption information detector 30 detects only caption packets from the video packet stream provided by the video information detector 10. The caption packets are included in the caption packets. A window separator 40 which provides window information and window ID of each of the first to eighth caption windows, and stores caption window priorities so as to have a high priority to a low priority for the first to eighth window ID information. The control unit 50 to control the first control unit and to provide a control signal for processing the caption window according to the stored priorities. A control for forming a predetermined caption window according to the caption command included in the window information provided by the window separator 40 by operating according to the priority provided by the controller 50. First through eighth window processors 60 generating commands, graphics processor 70 forming caption window graphics corresponding to control commands provided by first through eighth window processors 60, MPEG decoded video Under the control of the video processing unit 80 and the control unit 50 which process the caption window graphic formed by the graphic processor 70 on the information and display it on the screen, the lower priority is selected from the highest priority among the first to eighth window IDs. It comprises a memory (90) having a stack structure that stores the window ID, and reads and provides it when requested by the controller (90).

A detailed operation of the caption window priority processing apparatus of the ATV according to the present invention will be described with reference to the above-described members.

The video information detector 10 detects the video packet stream from the ATV transport stream and provides the video packet stream to the MPEG decoder 20 and the caption information detector 30. At this time, the MPEG decoder 20 MPEG-decodes the video packet stream provided from the video information detection unit 10 and provides the MPEG packet to the video processing unit 80.

The caption information detector 30 detects caption packets from the video packet stream provided by the video information detector 10 and provides the caption packets to the window separator 40. The window separator 40 detects N caption window information and caption window IDs corresponding to N pieces, i.e., each of the first through eighth caption windows, from the caption packets provided by the caption information detector 30, thereby providing eight caption window information. Each corresponding window processor 60 is provided, and eight caption window IDs are provided to the controller 50.

At this time, each of the eight caption windows is designated by the ID of the caption window. That is, the caption window ID number ranges from 0 to 7, and the priority of the caption window is 0 having the highest priority and 7 having the lowest priority.

The controller 50 stores the caption window IDs from the high priority to the low priority for the eight caption window IDs provided by the window separator 40, that is, the caption window IDs having the priority as described above. Store at 90. That is, the controller 50 controls the memory 90 to be positioned at a higher position as the caption window ID is higher, and when a new caption window is defined and the caption window ID is provided accordingly, the controller 50 corresponds to the priority stored in the memory 90. The control signal for operating the caption window processor is provided to the corresponding window processor among the eight window processors 60.

The memory 90 has a stack structure and stores the caption window ID at a higher position according to the control of the controller 50 and stores the caption window ID at a lower position. For example, if the caption window ID is 0 out of the 8 caption window IDs, as shown above, the priority is high and stored in the highest position of the stack. If the caption window is 7, the priority is lowest. Store at the lowest position of. Therefore, the controller 50 detects the caption window ID when the new caption window is defined and forms the caption window screen according to the order stored in the stack.

Meanwhile, the eight window processors 60 are configured to correspond one-to-one to each caption window information provided by the window separator 40, and are operated according to the priority provided by the controller 50 so that the window separator 40 may operate in the window separator 40. Provides to the graphics processor 70 a control command for forming a caption window screen newly defined by analyzing commands included in the provided caption window information, that is, a window size, a position to be displayed on the screen, and a character display form. .

For example, when three newly defined caption windows are simultaneously input, the controller 50 detects the priority stored in the memory 90 when the IDs of the input caption windows are 0, 2, and 5, and corresponds to the caption windows. It provides a control signal for operating the window processor. That is, if the ID of the newly defined caption window is 0, it has the highest priority, so that the window processor corresponding to the caption window ID is 0, that is, the first window processor 61, is operated. Then, the caption window ID is 2; The third window processor 63 may be operated, and the sixth window processor 66 having a caption window ID of 5 may be operated.

Accordingly, among the eight window processors 60, the first window processor 61 may preferentially have the window size and the screen included in the caption window information corresponding to the first window processor 61 provided by the window separator 40. Provides a command to the graphics processor 70 to interpret a command such as a position to be displayed on the screen and a character display form to form a newly defined caption window screen, that is, a caption window having a caption window ID of 0, and then the controller 50. ) Interprets the commands included in the caption window information corresponding to the third window processor 63 and generates a control command for forming a newly defined caption window screen, that is, a caption window having a caption window ID of 2. To provide.

In addition, the controller 50 interprets the command included in the caption window information corresponding to the sixth window processor 65 to form the caption window having the caption window ID of 6 and provides it to the graphic processor 70.

Accordingly, the graphics processor 70 may display caption window graphics corresponding to the control commands provided by the window processor 60, that is, the first window processor 61, the third window processor 63, and the sixth window processor 66. It is formed sequentially and provided to the video processor 80.

The video processor 80 is configured to process caption window graphics sequentially formed by the graphic processor 70 on the MPEG decoded video information provided from the MPEG decoder 20 and display them on the screen.

3 is a flowchart illustrating a caption window priority processing procedure in the ATV system according to the present invention, which will be described in detail with reference to the block diagram of the ATV system shown in FIG.

The controller 50 determines whether a new caption window is defined in S100. As a result of determination, when a new caption window is defined, an ID for the new caption window is detected (S110).

Then, it is detected whether the detected caption window ID is stored in the memory 90 (S120). As a result of the detection, if the detected caption window ID is already stored in the memory 90, the corresponding window processor is controlled to form a caption window with respect to the recently input caption window ID and to be displayed on the screen (S130).

On the other hand, if the detected caption window ID is not stored in the memory 90, the process proceeds to S140 where priority is determined from the high priority caption window ID to the low priority caption window ID and stored in the memory 90.

The controller 50 proceeds to S150 and when a new caption window is defined, processes the caption window according to a predetermined priority in S140.

As described above, the apparatus according to the present invention allows the caption window newly defined among the N caption windows to be displayed on the screen in consideration of priority, so that the caption windows overlap between the caption windows when the caption windows are displayed on the screen. There is an effect that can be prevented.

Claims (1)

An active caption window priority processing apparatus for processing an N-caption window information, each of which includes a command such as a window size, a position to be displayed on a screen, and a character display type, by a priority, is transmitted through a transport stream. A video information detection unit, wherein the active unit provides a video packet stream from a transport stream; An MPEG decoding unit for MPEG decoding and providing a video packet stream provided by the video information detecting unit; A caption information detector for detecting and providing caption packets from a video packet stream provided by the video information detector; A window separator for detecting and providing caption window information and a caption window ID corresponding to each of the N caption windows from the caption packet provided by the caption information detector; And store the caption window ID provided by the window separator in order of high priority to low priority. A controller which controls to process a caption window according to the stored priority when defining a new caption window; A memory for storing the caption window ID in order of high priority to low priority under the control of the controller; It is configured to correspond to each of the caption window information provided by the window separator, and operated according to the priority provided by the control unit to interpret the commands included in the caption window information to form the newly defined caption window screen. N window processors to provide control commands for the system; A graphics processor configured to form caption window graphics corresponding to control commands provided by the N window processors; And a video processor which processes the formed caption window graphic on the MPEG decoded video information and displays the caption window graphic on a screen.