Broadcast receiver and 3D subtitle data processing method thereof

Abstract

A broadcast receiver and a 3D subtitle data processing method thereof are disclosed. A method for processing three dimensional (3D) subtitle data includes receiving, by a receiver, a broadcast signal including 3D subtitle data, extracting, by an extracting unit, subtitle display information for a base view and extended subtitle display information for an extended view from the 3D subtitle data, and controlling, by a controller, a 3D subtitle display using the subtitle display information for the base view and the extended subtitle display information for the extended view.

The invention claimed is: 
     
       1. A method of processing a broadcast signal for a 3-dimensional (3D) content, the method comprising:
 encoding video data for the 3D content into a stream, the video data comprising a left picture for a left view and a right picture for a right view for the 3D content; 
 generating signaling information for the video data, wherein the signaling information includes subtitling descriptor including subtitling type information, 
 wherein the subtitling type information indicates that type of subtitle is a 3D subtitle with disparity information for the 3D content; 
 generating packet data including subtitle segment for subtitling of the 3D content; and 
 transmitting the broadcast signal including the video data, the packet data and the signaling information, 
 wherein the subtitle segment includes a segment type information indicating type of data in the subtitle segment, a page identifier indicating a page on which the 3D subtitle is displayed, region information identifying at least one region within the page, object part horizontal position indicating a horizontal position of the top left pixel of an object part in the at least one region, and the disparity information indicating a difference between horizontal positions of subtitles representing a same point in space in the right and left view of the 3D content for the page, and 
 wherein the subtitle segment further includes region size information specifying a horizontal width of the at least one region which is expressed in pixels, and 
 wherein the subtitle segment further includes region disparity information for indicating difference between horizontal positions of regions identified by the region information. 
 
     
     
       2. The method of  claim 1 , wherein the 3D subtitle includes at least one of displayed image, text data, graphic data, and logo. 
     
     
       3. The method of  claim 1 , wherein the subtitle segment further includes region disparity information indicating difference between horizontal positions of regions identified by the region information. 
     
     
       4. The method of  claim 1 , wherein the subtitle segment further includes object part information identifying at least one object part of the 3D subtitle within the at least one region and object part disparity information indicates difference between horizontal positions of object parts identified by the object part information. 
     
     
       5. An apparatus for receiving a broadcast signal for a 3-dimensional (3D) content, the apparatus comprising:
 a receiving unit that receives the broadcast signal including video data for the 3D content, the video data comprising a left picture for a left view and a right picture for a right view for the 3D content; 
 an extracting unit that extracts signaling information for the video data and packet data including subtitle segment for subtitling of the 3D content, 
 wherein the signaling information includes subtitling descriptor including subtitling type information, and 
 wherein the subtitling type information indicates that type of subtitle is a 3D subtitle with disparity information for the 3D content; and 
 a controller that controls a display of the 3D subtitle for the 3D content based on the subtitling type information and the subtitle segment, 
 wherein the subtitle segment includes a segment type information indicating type of data in the subtitle segment, a page identifier indicating a page on which the 3D subtitle is displayed, region information identifying at least one region within the page, object part horizontal position indicating a horizontal position of the top left pixel of an object part in the at least one region, and the disparity information indicating a difference between horizontal positions of subtitles representing a same point in space in the right and left view of the 3D content for the page, and 
 wherein the subtitle segment further includes region size information specifying a horizontal width of the at least one region which is expressed in pixels, and 
 wherein the subtitle segment further includes region disparity information for indicating difference between horizontal positions of regions identified by the region information. 
 
     
     
       6. The apparatus of  claim 5 , wherein the 3D subtitle includes at least one of displayed image, text data, graphic data, and logo. 
     
     
       7. The apparatus of  claim 5 , wherein the subtitle segment further includes region disparity information indicating difference between horizontal positions of regions identified by the region information. 
     
     
       8. The apparatus of  claim 5 , wherein the subtitle segment further includes object part disparity information indicates difference between horizontal positions of object parts identified by the object part information. 
     
     
       9. A digital receiver for processing a stereoscopic content, at least one subtitle and metadata, the digital receiver comprising:
 a receiving unit configured to receive segments including the stereoscopic content, the at least one subtitle and the metadata,   wherein the metadata is used for providing the at least one subtitle,   wherein the metadata comprises region ID for providing an identifier of a display window, and flag information for indicating whether region position information for the display window is present or not, further the region position information is used for representing a position of the display window on which the at least one subtitle is to be rendered; and   a controller coupled with the receiving unit,   the controller is configured to:
 parse the metadata; and 
 present the at least one subtitle together with the stereoscopic content based on the metadata. 
   
     
     
       10. The digital receiver of claim 9, wherein the metadata further comprises the region position information only when the flag information has a specific value. 
     
     
       11. The digital receiver of claim 10, wherein the metadata further comprises disparity information for representing a disparity as a fraction of a width of the display window for at least one view among the left and right views. 
     
     
       12. A method of transmitting a stereoscopic content, at least one subtitle and metadata in a transmitter, the method comprising:
 encoding bitstreams for the stereoscopic content, the stereoscopic content comprising a left picture for a left view and a right picture for a right view;   generating the at least one subtitle and the metadata, wherein the metadata is used for providing the at least one subtitle,   wherein the metadata comprises region ID for providing an identifier of a display window, and flag information for indicating whether region position information for the display window is present or not, further the region position information is used for representing a position of the display window on which the at least one subtitle is to be rendered; and   transmitting segments including the stereoscopic content, the at least one subtitle and the metadata.   
     
     
       13. The method of claim 12, wherein the metadata further comprises the region position information only when the flag information has a specific value. 
     
     
       14. The method of claim 13, wherein the metadata further comprises disparity information for representing a disparity as a fraction of a width of the display window for at least one view among the left and right views. 
     
     
       15. A method of transmitting a stereoscopic content, at least one subtitle and metadata in a transmitter, the method comprising:
 encoding bitstreams for the stereoscopic content, the stereoscopic content comprising a left picture for a left view and a right picture for a right view;   generating the at least one subtitle and the metadata, wherein the metadata is used for providing the at least one subtitle,   wherein the metadata comprises region ID for providing an identifier of a display window, and flag information for indicating whether region position information for the display window is present or not,   wherein the metadata further comprises the region position information when the flag information has a specific value; and   transmitting segments including the stereoscopic content, the at least one subtitle and the metadata.   
     
     
       16. The method of claim 15, wherein the specific value is 1.