WO2011000269A1

WO2011000269A1 - Method and device for high definition display of subtitles in video conference system

Info

Publication number: WO2011000269A1
Application number: PCT/CN2010/074084
Authority: WO
Inventors: 陈健; 况成禹; 李均荣; 谭明宇
Original assignee: 中兴通讯股份有限公司
Priority date: 2009-07-03
Filing date: 2010-06-18
Publication date: 2011-01-06
Also published as: CN101600082A

Abstract

A method and device for high definition display of subtitles in a video conference system are provided in the present invention. The method involves setting the to-be-displayed subtitle name character string, and the attribute of the subtitle character name string. A buffer region is set according to the attribute of the subtitle character name string. The font is extracted from a vector font library, according to the attribute of subtitle character name string, to generate a high definition chromatic graph. The generated high definition chromatic graph is written into the buffer region, and format conversion is performed for the generated high definition chromatic graph, then the high definition chromatic graph is displayed after the format conversion. The application of this invention brings high definition effect for display of subtitles and meets the requirements of concept of high definition in high definition terminal.

Description

Method and device for displaying subtitles in high definition in conference television system

The present invention relates to the field of subtitle display in a conference television system, and more particularly to a method and apparatus for displaying subtitles in high definition in a conference television system. Background technique

With the rapid development of the conference television technology, people are increasingly demanding videos, sounds, images, etc., and pursuing better effects, the current subtitle display effect is increasingly unable to meet people's requirements. The current subtitle overlay uses a binary bitmap, which is generated by a dot matrix font or compressed by other fonts. The biggest disadvantage of the dot matrix font is that it is fixed resolution, that is, each font has a fixed size. When used in the original size, the display is very good, but if you use it to zoom in or out, the display will be very good. Oops, there is usually a jagged phenomenon. However, if the binary bitmap generated by other font compression is enlarged or reduced, it will also appear jagged, which does not meet the requirements of the high definition concept of the current HD terminal.

How to provide a technical solution for high-definition display subtitles in a conference television system is a problem that needs to be solved currently. Summary of the invention

The technical problem to be solved by the present invention is to provide a method and a device for displaying a high-definition subtitle in a conference television system, so that the display of the subtitle can achieve a high-definition effect, so that it meets the requirements of the high-definition concept of the high-definition terminal.

In order to solve the above problems, the present invention provides a method for displaying subtitles in high definition in a conference television system, the method comprising:

Setting a subtitle name string to be displayed and a subtitle name string attribute, and according to the subtitle name String property setting buffer;

Generating a high-definition color map according to the font of the subtitle name string attribute extraction vector character library; performing format conversion on the generated high-definition color map, and displaying the format-converted high-definition color map. Preferably, after generating the high definition color map, the method further comprises: writing the generated high definition color map to the set buffer.

Preferably, the subtitle name string attribute includes any one or more of a subtitle color and a font size of the subtitle name; a subtitle color of the subtitle name includes a font color and a background color of the subtitle name; The picture shows a 16-bit color map.

Preferably, the generating a high-definition color map according to the font in the vector font library according to the subtitle name string attribute includes:

Characterizing the subtitle name string, retrieving the data of the character in the vector font, extracting the endpoint coordinates of the data, geometrically transforming the coordinates of the endpoint, and then according to whether the endpoints are connected or not Generate a high-definition color map.

Preferably, the vector font library is: the pen segmentation of each character is solved into a straight line and a curve, and the parameters of the straight line and the curve are stored, and when displayed, the straight line and the curve are drawn according to the required size.

Preferably, the format of the generated high-definition color map is an RGB format; and the generated high-definition color map is format converted to convert the format of the high-definition color map from an RGB format to a YUV format.

The present invention also provides a device for displaying subtitles in high definition in a conference television system, the device comprising: a main control unit, a digital signal processing (DSP) unit, a graphical user interface (GUI) unit, and a graphics engine font extraction unit, wherein

The GUI unit is configured to set a subtitle name string to be displayed and an attribute thereof, and send the set subtitle name string and its attribute to the main control unit; and receive the subtitle name character sent by the main control unit. The buffer address and size of the string are sent to the graphics engine font extraction list Receiving a size of the high-definition color map sent by the graphics engine font extraction unit and transmitting the size to the main control unit;

The main control unit is configured to set a buffer in the DSP unit according to the received subtitle name string attribute sent by the GUI unit, and send the address and size of the buffer to the GUI. Unit: transmitting the received high definition color map size to the DSP unit;

The graphics engine font extraction unit is configured to: according to the received subtitle name string attribute sent by the GUI unit, extract a font in the vector font to generate an HD color map; and send the generated HD color map size to the GUI Unit

The DSP unit is configured to read the high-definition color map according to the received size of the high-definition color map sent by the main control unit, perform format conversion on the high-definition color map, and display the format-converted high-definition color map.

Preferably, the graphics engine font extraction unit is further configured to: write the generated high definition color map into the buffer; the DSP unit is further configured to read the high definition color map from the buffer.

Preferably, the subtitle name string attribute includes any one or more attributes of a subtitle color and a font size of the subtitle name; the subtitle color of the subtitle name includes a font color and a background color of the subtitle name; 16-bit color map.

Preferably, the graphics engine font extraction unit is further configured to: perform character encoding on the subtitle name string, retrieve data of the character in a vector font, and extract end point coordinates of the data, to the endpoint The coordinates are geometrically transformed, and an HD color map is generated based on whether or not each endpoint is connected.

Preferably, the format of the high-definition color map generated by the graphics engine font extraction unit is RGB grid The format of the high-definition color map after the format conversion is a YUV format.

Compared with the prior art, the invention can be applied to enable the display of the subtitles to achieve the high-definition effect, so as to meet the requirements of the high-definition concept of the high-definition terminal; the fonts in the vector font can be extracted by the graphics engine font extraction program to generate various sizes and colors. Different fonts have solved the problem of serious sawtooth phenomenon in the prior art, which improves the visual effect of the user and achieves the purpose of high definition display. DRAWINGS

1 is a schematic structural view of an apparatus for displaying subtitles in high definition in a conference television system according to the present invention;

2 is a flow chart of a method for displaying subtitles in high definition in a conference television system according to the present invention; and FIG. 3 is a flow chart of high definition display of subtitles of the present invention. detailed description

The invention will be further described below in conjunction with the drawings and specific embodiments.

As shown in FIG. 1 , a device for displaying subtitles in high definition in a conference television system of the present invention, the device can be located in a conference television terminal, comprising: a main control unit, a digital signal processing (DSP) unit, and a graphical user interface (GUI) Unit and graphics engine font extraction unit, wherein

The GUI unit is configured to set a subtitle name string to be displayed and an attribute thereof, and send the set subtitle name string and its attribute to the main control unit; and receive the subtitle name character sent by the main control unit. The buffer address and size of the string are sent to the graphics engine font extraction unit; the size of the high-definition color map sent by the graphics engine font extraction unit is received and sent to the main control unit;

The main control unit is configured to set a buffer in the DSP unit according to the received subtitle name string attribute, and send the address and size of the buffer to the GUI unit; The size of the color map is sent to the DSP unit; The graphics engine font extraction unit is configured to: according to the received subtitle name string attribute sent by the GUI unit, extract a font in the vector font to generate a high-definition color map and write the high-definition color map into the buffer; The size of the generated HD color map is sent to the GUI unit;

The DSP unit is configured to read the high-definition color map from the buffer according to the received size of the high-definition color map sent by the main control unit, perform format conversion on the high-definition color map, and display the format converted HD color map.

The GUI unit and the main control unit communicate through a socket (socket), and the GUI unit and the graphics engine font extraction unit communicate through the socket, and the main control unit and the DSP unit communicate through the inter-chip queue.

The method for displaying subtitles in high definition in the conference television system of the present invention, as shown in FIG. 2, includes: Step 201: The GUI unit sets a subtitle name string to be displayed, and sets the subtitle name string attribute, and the set subtitles are included. The name string and the information of the subtitle name string attribute are sent to the main control unit;

The site name string attribute includes: a subtitle color and/or a font size of the subtitle name; and the subtitle color of the subtitle name includes a font color and a background color of the subtitle name.

Here, the subtitle name to be displayed is exemplified by the venue name.

Step 202: The main control unit receives the site name string and its attributes, sets a buffer according to the site name string attribute in the DSP unit, and sends the address and size of the buffer to the GUI unit.

Step 203: The GUI unit sends the field name string and its attributes and the address and size of the received buffer to the graphics engine font extraction unit.

Step 204: The graphics engine font extraction unit generates a 16-bit color map according to the font in the vector font library, and writes the generated color map into the buffer area set in the DSP unit.

The vector font is to divide the pen of each character into various lines and curves, and then write down these The parameters of the line and curve, when displayed, draw the lines according to the specific size, which restores the original characters. The advantage of the vector font is that you can zoom in and out at will and make it undistorted.

The graphics engine font extraction unit generates a 16-bit color map by extracting the font in the vector font according to the venue name string attribute, and includes the following steps:

Characterizing the character string of the site name, retrieving the data of the character in the vector font, extracting the coordinates of the endpoint, performing appropriate geometric transformation on the coordinates of the endpoint, and generating a character, that is, 16 bits, according to whether the endpoint is connected. Color map.

Step 205: The graphics engine font extraction unit sends information including the color map size to the GUI unit, and the GUI unit sends the received information including the color map size to the main control unit.

Step 206: The main control unit sends the received information including the color map size to the DSP unit.

Step 207: The DSP unit reads the 16-bit color map stored in the buffer according to the received information, performs format conversion on the color map, and displays the format-converted color map, thereby realizing high-definition display of the site name.

The color map generated by the graphics engine font extraction unit is in RGB format. The DSP needs to convert the RGB format to YUV format to optimize the transmission of color video signals.

The overall method of the present invention will be described below with reference to the accompanying drawings and examples of the venue. As shown in Figure 3:

Step 301: The GUI unit sets a string and a string attribute to be displayed; the GUI unit sends a message to the main control unit to display the site name “Shenzhen Venue 1”;

Among them, setting the string attribute is mainly to set the string to be displayed "Shenzhen venue Γ the font size is 72, the font color is yellow, and the background color is blue.

Step 302: After receiving the message, the main control unit sets a buffer according to the site name string attribute in the DSP unit, and feeds back the buffer address and size to the GUI unit, and the GUI unit The "Shenzhen Venue 1" is obtained from the message fed back by the main control unit.

Step 303: The GUI unit sends the character string to be displayed and its attribute and buffer address and size to the graphics engine font extraction unit.

Step 304: The graphics engine font extraction unit extracts the font in the vector font to generate a 16-bit color map of the character string to be displayed, and writes the 16-bit color map into the buffer.

Step 305: The graphics engine font extraction unit sends the size of the generated 16-bit color map to the GUI unit.

Step 306: The GUI unit sends a message to the main control unit to notify the size of the 16-bit color map generated by the main control unit.

The 16-bit color map has a size of 328*90 (width * height). Because the height and width of the Chinese character display are larger than the normal ASCII code, the height and width should be adjusted appropriately.

Step 307: The main control unit notifies the DSP unit of the size of the generated 16-bit color map, so that the DSP unit reads the high-definition color map.

Step 308: The DSP unit reads the generated 16-bit color map from the buffer, converts the RGB format to YUV, and displays the formatted color map information.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope of the present invention. All should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

Claim

A method for displaying subtitles in high definition in a conference television system, characterized in that the method comprises:

Setting a subtitle name string to be displayed and the subtitle name string attribute, and setting a buffer according to the font name string attribute;

Generating a high-definition color map according to the font of the subtitle name string attribute extraction vector character library; performing format conversion on the generated high-definition color map, and displaying the format-converted high-definition color map.

2. The method of claim 1, wherein after generating the high definition color map, the method further comprises: writing the generated high definition color map to the set buffer.

The method according to claim 1, wherein the subtitle name string attribute includes: any one or more of a subtitle color and a font size of the subtitle name;

The subtitle color of the subtitle name includes: a font color and a background color of the subtitle name;

The high definition color map is a 16-bit color map.

The method according to claim 1, wherein the generating a high-definition color map by extracting a font in the vector font from the subtitle name string attribute comprises:

5. The method according to claim 1, wherein the vector font library is: decomposing a pen segment of each character into a straight line and a curve, and storing parameters of the straight line and the curve, when displayed, according to the requirements Dimensions, draw the lines and curves.

The method according to claim 1, wherein the generated high-definition color map has a format of RGB;

The formatting of the generated high-definition color map is to convert the format of the high-definition color map from an RGB format to a YUV format.

7. A device for displaying subtitles in a high definition conference television system, the device comprising: a main control unit, a digital signal processing DSP unit, a GUI unit of a graphical user interface, and a graphics engine font extraction unit, wherein

The GUI unit is configured to set a subtitle name string to be displayed and an attribute thereof, and send the set subtitle name string and its attribute to the main control unit; and receive the subtitle sent by the main control unit The buffer address and size of the name string are sent to the graphics engine font extraction unit; the size of the high-definition color map sent by the graphics engine font extraction unit is received and sent to the main control unit;

The main control unit is configured to set a buffer in the DSP unit according to the received subtitle name string attribute sent by the GUI unit, and send the address and size of the buffer to the a GUI unit; transmitting a size of the received high definition color map to the DSP unit;

The DSP unit is configured to read the high-definition color map according to the received size of the high-definition color map sent by the main control unit, perform format conversion on the high-definition color map, and display a format-converted high-definition color Figure.

The device according to claim 7, wherein the graphics engine font extraction unit is further configured to: write the generated high-definition color map into the buffer; the DSP unit is further used to The buffer reads the high definition color map.

9. The apparatus according to claim 7, wherein the subtitle name string attribute comprises: any one or more attributes of a subtitle color and a font size of the subtitle name;

The high definition color map is a 16-bit color map.

10. The apparatus of claim 7, wherein the graphics engine font extraction The unit is further configured to: perform character encoding on the subtitle name string, retrieve data of the character in a vector font, extract an endpoint coordinate of the data, perform geometric transformation on the endpoint coordinate, and then perform each end point according to each end point Whether the connected logo generates a high-definition color map.

11. The apparatus according to claim 7, wherein the vector font library is: dividing a pen of each character into a straight line and a curve, and storing parameters of the straight line and the curve, when displayed, according to the requirements Dimensions, draw the lines and curves.

The device according to claim 7, wherein the format of the high-definition color map generated by the graphics engine font extraction unit is an RGB format; and the format of the high-definition color map after the format conversion is a YUV format.