KR20000013907U - TV caption processing unit - Google Patents

Abstract

The present invention displays a graphic window by processing caption information transmitted from the ATV as a packet stream. The caption information includes commands for forming a graphic window such as a window size, a position to be displayed on the screen, and a character display form. A caption processing apparatus included, comprising: a command buffer for storing a command; A command decryption unit configured to decrypt a command stored in the command buffer and generate a paint command for forming the graphic window; A paint processor constituting a caption graphic window screen corresponding to the paint instruction provided from the command decoding unit; And a projection unit for projecting a caption graphic window screen provided by the paint processor.

Description

TV caption processing unit

The present invention relates to a caption processing apparatus for projecting caption information, which is included in video information and transmitted, in particular in an ATV (Advanced Television) system.

In general, the ATV system compresses and transmits digital video and audio data by using a predetermined compression algorithm, for example, a hybrid encoding algorithm, and restores the video and audio data that is compressed and transmitted to the original data to serve a viewer. In this 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.

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, and the caption display type. For example, the window command and the pen command , Synchronous commands, text commands, and so on.

The window command indicates the ID, size, position, and color of the window, and the pen command indicates the size, font style, character style, foreground and background color of the text. . Synchronous commands control data read rates, and text commands are not specifically defined.

Accordingly, when the caption processing apparatus includes the caption information in the video information and is transmitted, the caption processing apparatus extracts the caption information from the video information, decodes each command in the caption information, and generates a paint command for configuring the caption window screen. Form a window graphic to be displayed on the screen according to the command.

However, such a conventional caption processing apparatus is displayed only on a TV monitor, and its function was not varied.

Accordingly, an object of the present invention is to provide a caption processing apparatus in which the caption processing function is more diversified by projecting caption characters.

The present invention for achieving the above object is to display a graphic window by processing the caption information transmitted from the ATV to the packet stream, the caption information includes a graphic such as the size of the window, the position to be displayed on the screen, the character display form A caption processing apparatus including commands for forming a window, comprising: a command buffer for storing the command; A command decryption unit configured to decrypt a command stored in the command buffer and generate a paint command for forming the graphic window; A paint processor constituting a caption graphic window screen corresponding to the paint instruction provided from the command decoding unit; And a projection unit for projecting a caption graphic window screen provided by the paint processor.

1 is a diagram illustrating a structure of a demultiplexed data stream when a subscriber selects a specific channel in an ATV;

Figure 2 is a block diagram showing a caption processing apparatus according to an embodiment of the present invention.

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

205: Video information detector 210: User data detector

215: caption data extraction unit 220: command buffer

225: command decryption unit 230: paint processor

235 projection unit

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

2 shows a caption processing apparatus according to an embodiment of the present invention. In FIG. 2, the caption processing apparatus includes a video information detector 205, a user data detector 210, a caption data extractor 215, a command buffer 220, a command decoder 225, a paint processor 230, and a projection. Part 235 is included.

Referring to FIG. 2, the video information detection unit 205 receives video information, audio information, and control information of a predetermined channel. The video information detector 205 detects only video information among video information, audio information, and control information of a predetermined channel, and outputs it on the line L1.

Video information on the line L1 is provided to the user data detector 210. The user data detection unit 210 detects only the user data stream which is included in the video information on the line L1 and is transmitted and outputs it on the line L2.

The user data stream on line L2 is provided to the caption data extraction unit 215. The caption data extracting unit 215 extracts only the caption data stream included in the user data stream on the line L2 and outputs the caption data stream on the line L3. The caption data stream on the line L3 includes various commands for configuring the caption screen such as the size of the caption window displayed on the screen, the position to be displayed on the screen, the caption display format, and the like.

Various commands for caption screen configuration on line L3 are provided to the command buffer 220. The command buffer 220 stores various commands for caption screen configuration in an input order and sequentially outputs them on the line L4.

Commands on the line L4 are provided to the command decryption unit 225. The command decryption unit 225 reads whether the command on the line L4 is a window command, a pen command, a synchronous command, or a text command. The command decoding unit 225 determines the ID, size, position, color, size of the character, font style, character style, foreground and background color of the character according to the read command, and then generates a corresponding paint command. To the line L5.

The paint instruction on line L5 is provided to paint processor 230. When the paint command on the line L5 is input, the paint processor 230 forms a caption window graphic in response to the paint command. Caption window graphics formed in the paint processor 230 are provided to the projection portion 235 via line L6.

The projection unit 235 projects the caption window graphic on the wall surface or the screen.

As described above, the present invention further increases the caption processing function by adding a function of projecting caption characters in the ATV system.

Claims (1)

A caption information transmitted from the ATV to the packet stream is processed to display a graphic window. The caption information includes captions including commands for forming a graphic window such as a window size, a position to be displayed on the screen, and a character display form. In the processing unit: A command buffer for storing the command; A command decryption unit configured to decrypt a command stored in the command buffer and generate a paint command for forming the graphic window; A paint processor constituting a caption graphic window screen corresponding to the paint instruction provided from the command decoding unit; And a caption processing unit for projecting a caption graphic window screen provided by the paint processor.