KR100398866B1 - Caption character processing method in atv system - Google Patents

Abstract

The present invention relates to a character processing method for displaying a character screen based on pen commands in caption information transmitted from a ATV to a packet stream, the method comprising: A) decoding a character array format by decoding the pen command; B) generating a text window for horizontal writing or vertical writing according to the character arrangement format, wherein each of the text windows comprises an upper region, a center region, and a lower region; C) determining the character type to form a character graphic of a normal character, superscript or subscript; D) searching for a predetermined reference point corresponding to the character type and the character arrangement format on the text window; E) forming coordinates based on the searched reference point, and mapping the character graphic to a predetermined position on the formed coordinates.

Description

Caption character processing method of TV system {CAPTION CHARACTER PROCESSING METHOD IN ATV SYSTEM}

The present invention relates to an apparatus for processing caption information included in video information and transmitted in an ATV (Advanced Television) system, and more particularly, to a caption character processing method for processing text information included in sequentially provided caption information. It is about.

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.

In such a window graphic, the character graphic is formed based on the horizontal writing format. That is, the character graphic is formed based on the pen command. As described above, the pen command is related to the size of the character, the font style, the character style, the foreground and the background color of the character, and the horizontal writing of the character array format. By default, all character graphics are written in horizontal writing only.

Accordingly, an object of the present invention is to provide a caption character processing method capable of forming a character graphic for both horizontal writing and vertical writing.

In order to achieve the above object, the present invention provides a caption character processing method for displaying a caption character screen based on pen commands in caption information transmitted from a ATV to a packet stream: A) character array by decoding the pen command; Decrypting the form; B) generating a text window for horizontal writing or vertical writing according to the character arrangement format, wherein each of the text windows comprises an upper region, a center region, and a lower region; C) determining the character type to form a character graphic of a normal character, superscript or subscript; D) searching for a predetermined reference point corresponding to the character type and the character arrangement format on the text window; E) forming coordinates based on the searched reference point, and mapping the character graphic to a predetermined position on the formed coordinates.

1 is a view showing a character processing apparatus for performing the caption character processing method of the present invention,

2 is a flowchart illustrating a caption character processing method according to an embodiment of the present invention;

3 is a text window screen for explaining horizontal writing text processing according to an embodiment of the present invention;

4 is a text window screen for explaining vertical writing text processing according to an embodiment of the present invention;

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

105: caption data extraction unit 110: pen command extraction unit

115: horizontal writing processing unit 120: vertical writing processing unit

125: paint process unit

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

1 is a block diagram of a character processing apparatus for performing a caption character processing method of the present invention, Figure 2 is a caption character processing method according to an embodiment of the present invention.

In FIG. 1, the caption character processing apparatus includes a caption data extracting unit 105, a pen command extracting unit 110, a horizontal writing processing unit 115, a vertical writing processing unit 120, and a paint processing unit 125.

The user data stream including the caption information is provided to the caption data extractor 105. The caption data extraction unit 105 extracts only the caption data stream from the user data stream and provides it on the line L1. The caption data stream on the line L1 is provided to the pen comment extraction unit 110.

Referring to FIG. 2, the pen command extracting unit 110 extracts only pen commands from a caption data stream (S1), and then decodes a character array format command included in the pen command (S2). As a result of the decoding, if the character array format is horizontal writing (S3), each pen commands are provided on the line L2, and if the character array format is vertical writing, each pen commands are provided on the line L3.

Pen commands on the line L2 are provided to the horizontal writing processing unit 115. The horizontal writing processing unit 115 deciphers each pen command to determine a character size (S4) and generates a horizontal writing character window having a predetermined size (S5).

Referring to FIG. 3, horizontal write character windows 205-235 are shown. The horizontal writing character windows 205 to 235 are divided into an upper region 21, a center region 22, and a lower region 23 as illustrated in FIG. 3. After the horizontal writing character window is generated, the horizontal writing signal processor 115 determines whether the character to be generated is a normal character, a superscript, or a subscript (S6). As a result of the determination, in the case of the general character, a character graphic having a size corresponding to the character determined by the decryption of the pen command is formed. When the generated character is a superscript or a subscript, a character graphic having a size reduced by 1 / K is formed than a character of the size determined by the decoding of the pen command (S7).

After the general character graphic, the superscript graphic, or the subscript graphic is formed in this way, the reference point for mapping the character graphic on the character window is searched (S8). The reference point for mapping the general character graphic is the lower left vertex (a) of the center region 22, the reference point for mapping the superscript is the lower left vertex (b) of the upper region 21, and the subscript is mapped. The reference point for this is preset to the lower left vertex c of the center area 22.

Therefore, when the formed character is a general character, the horizontal writing processor 115 searches for the general character reference point a, and the center region 22 or the center region 22 and the lower region based on the searched reference point. After the coordinate axis is formed at (23) (S9, S10), the character graphic is mapped to a predetermined position on the coordinate axis (S11). Referring to FIG. 3, as in the text windows 205 and 215, a letter such as "A" or "x" forms a coordinate only on the center area 22, but a letter such as "g" as in the text window 230 may be used. Coordinates are formed on the central area 22 and the lower area 23 to map the character graphics.

On the other hand, as shown in the text window 235, when the character to be generated is a superscript, the horizontal writing processing unit 115 searches for the superscript reference point (c) (S8), and when the superscript reference point is completed (S9) After the coordinate axis is formed in the upper region 21 based on the found reference point (S10), the superscript is mapped to a predetermined position on the coordinate axis (S11).

In addition, as shown in the text window 220, if the character to be generated is a subscript, the horizontal writing processor 115 searches for the subscript reference point (S8), and if the subscript reference point is searched (S9), the search is completed. After the coordinate axis is formed in the center area 22 based on the reference point thus obtained (S10), the subscript is mapped to a predetermined position on the coordinate axis (S11). By this process, the character mapped to the character window is provided by line L4.

Pen commands on the line L3 are provided to the vertical writing processing unit 120. The vertical writing processing unit 120 decodes each pen command to determine a text size (S12) and generates a vertical text window having a predetermined size (S13).

Referring to FIG. 4, vertical writing text windows 305-325 are shown. As shown in FIG. 4, the vertical writing text window is divided into an upper region 31, a center region 32, and a lower region 33. After the vertical writing character window is generated, the vertical writing signal processing unit 120 determines whether the character to be generated is a normal character, a superscript, or a subscript (S14). As a result of the determination, in the case of the general character, a character graphic having a size corresponding to the character determined by the decryption of the pen command is formed (S15). If the character to be generated is a superscript or subscript, a character graphic of a size reduced by 1 / K is formed than a character of the size determined by the decoding of the pen command.

After the general character graphic, the superscript graphic, or the subscript graphic is formed as described above, a reference point for searching the character graphic on the text window is searched (S16). The reference point for mapping the general character graphic is the lower left vertex (d) of the center region 32, the reference point for mapping the superscript is the lower left vertex (e) of the upper region 31, and the subscript is mapped. The reference point for this is preset as the lower right vertex f of the center area 32.

Therefore, when the formed text is a normal text, the vertical writing processor 115 searches for the general text reference point d as shown in the text window 305 and the text window 320, and then, based on the searched reference point, the center region is based on the searched reference point. (32) Or a coordinate axis is formed in the center area | region 32 and the lower area 33 (S16, S17), and a character graphic is mapped to the predetermined position on a coordinate axis (S18).

When the character to be generated is a superscript, the vertical writing processing unit 120 searches for the superscript reference point (e) (S16). When the superscript reference point (e) is searched for (S17), the searched reference point is searched for. After the coordinate axis is formed in the upper region 31 as a reference (S18), the superscript is mapped to a predetermined position on the coordinate axis (S19).

In addition, when the character to be generated is a subscript, the vertical writing processing unit 120 searches for the subscript reference point f (S16), and when the subscript reference point f is completed (S17), the searched reference point After forming the coordinate axis in the center area 32 on the basis of (S18), the subscript is mapped to a predetermined position on the coordinate axis (S19). By this process, the characters mapped to the character window are provided in line L5.

The text mapped to the text window on line L4 or line L5 is provided to paint process unit 225. When the text mapped to the text window is input through the line L4 or the line L5, the paint processor 225 paints the text and displays it on the screen.

As described above, the present invention has the effect of further enhancing the caption function by enabling both horizontal writing and vertical writing to be used in displaying character information among caption information transmitted by being included in video information.

Claims (2)

A caption character processing method for displaying a character screen based on pen commands in caption information transmitted from an ATV to a packet stream: A) decrypting the pen command to decrypt a character array format; B) generating a text window for horizontal writing or vertical writing according to the character arrangement format, wherein each of the text windows comprises an upper region, a center region, and a lower region; C) determining the character type to form a character graphic of a normal character, superscript or subscript; D) searching for a predetermined reference point corresponding to the character type and the character arrangement format on the text window; E) forming a coordinate based on the searched reference point, and mapping the character graphic to a predetermined position on the formed coordinates. The method of claim 1, wherein step D) comprises: In the horizontal writing text window, the caption character processing of the ATV in which the lower left vertex of the center area is set as the reference point of the normal character and the subscript, and the lower left vertex of the upper area is set as the reference point of the superscript. Way.