Method and apparatus for generating a broadcast bit stream for digital broadcasting with captions, and method and apparatus for receiving a broadcast bit stream for digital broadcasting with captions

A method for receiving a broadcasting bitstream for a digital caption broadcast, the method comprising:

• receiving a bitstream comprising encoded video data which includes at least one of a two-dimensional (2D) video and a three-dimensional (3D) video;
• extracting the encoded video data, caption data for reproduction in conjunction with a video, and 3D caption converting information comprising information relating to a converting speed of an offset for reproducing the caption data as a 3D caption from the bitstream by de-multiplexing and parsing the received bitstream;
• and
• determining a reproducing form of the caption data relating to displaying the reproduced caption data as a 3D caption on a video screen, based on the extracted 3D caption converting information,
• wherein the extracting comprises extracting a caption offset converting speed command from a caption service data region of a video stream relating to the bitstream, and
• the determining of the reproducing form comprises reading caption offset converting speed information comprising target offset information indicating a target offset of a 3D caption window and caption offset converting section information indicating a section within which a caption offset is converted, from a caption service data region of the bitstream based on the extracted caption offset converting speed command.

An apparatus for generating a broadcasting bitstream for a digital caption broadcast, the apparatus comprising:

• a video data receiver configured to receive video data in which a video comprising at least one of a two-dimensional (2D) video and a three-dimensional (3D) video is encoded by a video encoding processor;
• a 3D caption converting information determiner configured to determine caption data for reproduction in conjunction with the video, and 3D caption converting information comprising information relating to a converting speed of an offset for reproducing the caption data as a 3D caption;
• and
• a bitstream output unit configured to output a bitstream for a digital broadcast by multiplexing the received video data, the determined caption data, and the determined 3D caption converting information,
• wherein the 3D caption converting information further comprises target offset information indicating a target offset of a caption window and caption converting section information indicating a section within which a caption offset is converted.

An apparatus for receiving a broadcasting bitstream for a digital caption broadcast, the apparatus comprising:

• a bitstream receiver configured to receive a bitstream comprising encoded video data which includes at least one of a two-dimensional (2D) video and a three-dimensional (3D) video;
• an extractor configured to extract the encoded video data, caption data for reproduction in conjunction with a video, and 3D caption converting information comprising information relating to a converting speed of an offset for reproducing the caption data as a 3D caption from the bitstream by de-multiplexing and parsing the received bitstream;
• and
• a caption determiner configured to determine a reproducing form of the caption data relating to displaying the reproduced caption data as a 3D caption on a video screen based on the extracted 3D caption converting information,
• wherein the extractor is further configured to extract a caption offset converting speed command from a caption service data region of a video stream relating to the bitstream, and
• the caption determiner is further configured to determine the reproducing form by reading caption offset converting speed information comprising target offset information indicating a target offset of a 3D caption window and caption offset converting section information indicating a section within which a caption offset is converted, from a caption service data region of the bitstream based on the extracted caption offset converting speed command.