Reception apparatus, reception method, and transmission apparatus

Abstract

The video stream is decoded to obtain video data, and the subtitle stream including the caption information is decoded to obtain bitmap data of the caption. The caption display position in the caption display position information included in the caption information is designated as a relative position with respect to the caption display range. In a case where the aspect ratio of the video area is different from the aspect ratio of the display video area, the caption display position is determined with the display video area defined as the caption display range, further resize processing is performed, and the display position control is performed onto the bitmap data of the caption on the basis of the caption display position that has undergone the resize processing. Bitmap data of the caption that has undergone display position control is superimposed on the video data to obtain display video data.

1 . A reception apparatus, comprising:
 processing circuitry configured to
 receive a video stream including video data and a subtitle stream including caption information, the caption information including caption display position information that designates a caption display position by a relative position with respect to a reference point of a caption display range, 
 decode the subtitle stream to obtain caption bitmap data, and 
 superimpose the caption bitmap data at the caption display position on the video data based on the caption display position information, wherein 
   the caption display range in a video area is set based on aspect ratio information indicating the caption display range in the video area when the aspect ratio information exists in the caption information and when a display of the reception apparatus is in a mode of displaying the entire video area.   
     
     
         2 . The reception apparatus according to  claim 1 , wherein the video area is set as the caption display range when the aspect ratio information does not exist in the caption information. 
     
     
         3 . The reception apparatus according to  claim 1 , wherein the caption information is in a timed text markup language (TTML) or TTML-derived format. 
     
     
         4 . The reception apparatus according to  claim 3 , wherein the aspect ratio information is in a root container of the TTML or the TTML-derived format. 
     
     
         5 . The reception apparatus according to  claim 1 , wherein the processing circuitry is further configured to
 determine a caption display area in the caption display range based on the caption display position, wherein   the caption information includes information related to a resizing process of the caption display area based on the aspect ratio information.   
     
     
         6 . A reception method, comprising:
 receiving a video stream including video data and a subtitle stream including caption information, the caption information including caption display position information that designates a caption display position by a relative position with respect to a reference point of a caption display range;   decoding the subtitle stream to obtain caption bitmap data; and   superimposing the caption bitmap data at the caption display position on the video data based on the caption display position information, wherein   the caption display range in a video area is set based on aspect ratio information indicating the caption display range in the video area when the aspect ratio information exists in the caption information and when a display of the reception apparatus is in a mode of displaying the entire video area.   
     
     
         7 . The reception method according to  claim 6 , wherein the video area is set as the caption display range when the aspect ratio information does not exist in the caption information. 
     
     
         8 . The reception method according to  claim 6 , wherein the subtitle information is in a timed text markup language (TTML) or TTML-derived format. 
     
     
         9 . The reception method according to  claim 8 , wherein the aspect ratio information exists in a root container of the TTML or the TTML-derived format. 
     
     
         10 . The reception method according to  claim 6 , further comprising:
 determining a caption display area in the caption display range based on the caption display position, wherein   the caption information includes information related to a resizing process of the caption display area based on the aspect ratio information.   
     
     
         11 . A non-transitory computer readable medium including executable instructions, which when executed by a computer cause the computer to execute a method for a reception apparatus, the method comprising:
 receiving a video stream including video data and a subtitle stream including caption information, the caption information including caption display position information that designates a caption display position by a relative position with respect to a reference point of a caption display range;   decoding the subtitle stream to obtain caption bitmap data; and   superimposing the caption bitmap data at the caption display position on the video data based on the caption display position information, wherein   the caption display range in a video area is set based on aspect ratio information indicating the caption display range in the video area when the aspect ratio information exists in the caption information and when a display of the reception apparatus is in a mode of displaying the entire video area.   
     
     
         12 . The method according to  claim 11 , wherein the video area is set as the caption display range when the aspect ratio information does not exist in the caption information. 
     
     
         13 . The method according to  claim 11 , wherein the subtitle information is in a timed text markup language (TTML) or TTML-derived format. 
     
     
         14 . The method according to  claim 11 , wherein the aspect ratio information exists in a root container of the TTML or the TTML-derived format. 
     
     
         15 . The method according to  claim 11 , further comprising:
 determining a caption display area in the caption display range based on the caption display position, wherein   the caption information includes information related to a resizing process of the caption display area based on the aspect ratio information.