WO2016036012A1 - Procede et dispositif d'emission/reception d'un signal de diffusion - Google Patents

Procede et dispositif d'emission/reception d'un signal de diffusion Download PDF

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Publication number
WO2016036012A1
WO2016036012A1 PCT/KR2015/008093 KR2015008093W WO2016036012A1 WO 2016036012 A1 WO2016036012 A1 WO 2016036012A1 KR 2015008093 W KR2015008093 W KR 2015008093W WO 2016036012 A1 WO2016036012 A1 WO 2016036012A1
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Prior art keywords
caption
subtitle
scroll
xml
information
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PCT/KR2015/008093
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English (en)
Korean (ko)
Inventor
오현묵
서종열
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엘지전자 주식회사
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Publication of WO2016036012A1 publication Critical patent/WO2016036012A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/025—Systems for the transmission of digital non-picture data, e.g. of text during the active part of a television frame
    • H04N7/035—Circuits for the digital non-picture data signal, e.g. for slicing of the data signal, for regeneration of the data-clock signal, for error detection or correction of the data signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47—End-user applications
    • H04N21/488—Data services, e.g. news ticker
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division

Definitions

  • the present invention relates to an apparatus and method for transmitting and receiving broadcast signals.
  • broadcasting subtitle service is provided in the form of closed caption or DVB (Digital Video Broadcasting) subtitle.
  • DVB subtitles are provided in the form of a bitmap image. Therefore, subtitles of different sizes should be provided for images of various sizes, or services should be provided by scaling subtitles of a single standard. In this case, in the former case, the efficiency decreases in terms of bandwidth, and in the latter case, a sharpness due to scaling occurs.
  • the discussion of high-definition broadcasting service through UHDTV is being actively conducted, and a need for a new broadcasting subtitle service is emerging to solve this problem.
  • An object of the present invention is to improve transmission efficiency in a method and apparatus for transmitting a broadcast signal.
  • Another object of the present invention is to provide a transmission apparatus and method for providing a caption service in a broadcasting network.
  • Another object of the present invention is to provide a broadcast apparatus and method for improving the quality of a subtitle service.
  • the broadcast signal transmission method may include generating a broadcast signal including video data and subtitle data and transmitting the generated broadcast signal.
  • the caption data may include XML caption data.
  • the XML caption data may include caption text and caption metadata.
  • the caption metadata may include information on caption scrolling.
  • the caption metadata may include at least one of a scroll direction, a scroll speed, a scroll type, or a scroll information identifier of the caption.
  • the broadcast signal receiving method may include receiving a broadcast signal including video data and caption data, and processing and outputting the video data and caption data.
  • the caption data may include XML caption data.
  • the XML caption data may include caption text and caption metadata.
  • the caption metadata may include information on caption scrolling.
  • the caption metadata may include at least one of a scroll direction, a scroll speed, a scroll type, or a scroll information identifier of the caption.
  • a high quality subtitle service can be provided in a broadcasting network.
  • a subtitle service having backward compatibility may be provided in a broadcasting network.
  • the broadcast reception device may extract and display a subtitle included in a broadcast signal.
  • FIG. 1 is a diagram illustrating an XML-based broadcast subtitle service according to an embodiment of the present invention.
  • FIG. 2 is a diagram illustrating an operation of a receiver for XML-based subtitles according to an embodiment of the present invention.
  • FIG. 3 is a diagram illustrating an XML subtitle decoder including a scroll function according to an embodiment of the present invention.
  • FIG. 4 illustrates XML captions when smooth scrolling is implemented in an EBU-TT-D according to an embodiment of the present invention.
  • FIG 5 shows information about subtitle scrolling according to an embodiment of the present invention.
  • FIG 6 illustrates subtitle scroll information according to an embodiment of the present invention.
  • FIG. 7 illustrates XML captions when smooth scrolling is implemented in an EBU-TT-D according to another embodiment of the present invention.
  • FIG. 8 illustrates XML captions when smooth scrolling is implemented in an EBU-TT-D according to another embodiment of the present invention.
  • FIG 9 illustrates XML captions when smooth scrolling is implemented in an EBU-TT-D according to another embodiment of the present invention.
  • FIG. 10 illustrates XML captions when smooth scrolling is implemented in an EBU-TT-D according to another embodiment of the present invention.
  • FIG. 11 shows a definition for a caption scroll element according to another embodiment of the present invention.
  • FIG. 12 illustrates XML captions for calling a scroll function by using an identifier according to an embodiment of the present invention.
  • FIG. 13 is a block diagram illustrating a broadcast transmitter according to an embodiment of the present invention.
  • FIG. 14 is a block diagram illustrating a broadcast receiver according to an embodiment of the present invention.
  • 15 is a diagram illustrating a detailed configuration of a broadcast receiver according to an embodiment of the present invention.
  • FIG. 16 illustrates a method of transmitting a broadcast signal including XML subtitles according to an embodiment of the present invention.
  • FIG. 17 illustrates a method of receiving a broadcast signal including XML subtitles according to an embodiment of the present invention.
  • TTML time text markup language
  • EBU-TT EBU time text
  • XML-based subtitle can support various sizes of video and is considered as one of UHD-based next-generation subtitle service method because it is suitable for IP streaming-based service.
  • a method for providing a scroll function in providing an XML-based broadcast media subtitle service can be described.
  • the present invention may describe a style (or metadata) and a scroll direction, a scroll unit, a scroll speed, and a scroll application method related to a scroll function for a subtitle.
  • a unit in which subtitles are displayed on the screen can be described.
  • High Efficiency Video Coding is a high-efficiency video coding standard that offers the same video quality with approximately twice the compression rate compared to traditional H.265 / AVC technology.
  • Extensible Markup Language is a language that is an improvement of HTML. It has improved the homepage building function and search function, and can easily handle the complex data of the client system.
  • the caption data is used as a language, and the XML caption may be composed of a head and a body.
  • PTS Presentation Time Stamp
  • the PTS can be used to synchronize the video ES and the subtitle ES.
  • ES Electronic Stream
  • outputs of the video encoder and the audio encoder may be defined as a video ES and an audio ES, respectively.
  • the XML subtitle ES can be defined and used.
  • TS Transport Stream
  • TS is a transport stream including one or several programs in an MPEG-2 system and can be used for a transmission medium in which a transport error exists.
  • TS may mean a transport stream in which at least two of a video ES, an audio ES, and a subtitle ES are multiplexed and transmitted.
  • FIG. 1 is a diagram illustrating an XML-based broadcast subtitle service according to an embodiment of the present invention. 1 illustrates a diagram of a transmitter, a receiver, and an end-to-end system for a digital broadcast service.
  • the XML-based subtitles used in the present invention can be applied to both UHD / HD / SD since they are not affected by the size of the image.
  • the transmitting end may transmit the compressed image and the modified XML subtitle for transmission through a multiplexer.
  • the receiver demultiplexes the received signal and provides subtitles through image decoding and XML parser, and the graphic engine may modify the subtitle expression method according to the receiver's environment and output it to the display processor.
  • the display processor may output the decoded image and the subtitle.
  • the transmitting end may receive video data and subtitle information.
  • the resolution of the video data input to the transmitter may be UHD, HD or SD.
  • the caption information input to the transmitting end may be written in XML.
  • Video data input to the transmitting end may be encoded by an encoder at the transmitting end (101).
  • the transmitting end may use HEVC (High Efficiency Video Coding) as an encoding method for video data.
  • the transmitting end may synchronize the encoded video data with XML subtitles and multiplex using a multiplexer (102).
  • the XML subtitle can be modified for transmission.
  • the transformation method for the XML subtitle and the metadata generation method for the XML subtitle will be described in detail below.
  • the transmitter may perform channel coding and modulation of the synchronized and multiplexed data and then transmit the broadcast signal as a broadcast signal.
  • the receiving end may receive a broadcast signal and perform demodulation and transport packet decoding.
  • the receiving end may perform video decoding and XML parsing after demultiplexing the decoded transport packet.
  • XML parsing can be performed through an XML parser.
  • the receiving end may acquire metadata, and the metadata may be used as additional information in displaying the video and the subtitle together.
  • the receiver may demodulate the received broadcast signal and perform transport packet decoding (104).
  • the decoded transport packet is input to the video decoder 106 and the XML parser 107 after demultiplexing 105.
  • the video decoder 106 may decode the UHD, HD or SD video data according to the resolution of the received video data.
  • the XML parser 107 may extract XML captions and metadata.
  • the receiving end may implement a scrolling function that displays a large amount of subtitles on a constant screen in displaying video data and XML subtitles using meta data.
  • the receiver can implement a scroll function even in XML-based subtitles.
  • the present invention can be implemented for a subtitle service provided by all types of services such as IP streaming service, storage media, as well as a broadcast service. It can be modified.
  • the decoded video data and the XML subtitle in which the presentation method is modified may be processed and displayed by the display processor 109.
  • the receiver may include an XML subtitle decoder with a scroll function.
  • the XML subtitle decoder may be used in the same sense as the XML parser or in a meaning including the XML parser.
  • the XML caption decoder may receive and decode XML-based captions to output caption text data.
  • the XML subtitle decoder may extract metadata about the subtitles together in decoding the XML-based subtitles.
  • the metadata about the subtitle may include information about the subtitle scrolling.
  • the information about the subtitle scrolling may include information about a scroll direction, a scroll type, a scroll speed, and a writing direction.
  • the caption text data output from the XML caption decoder and the caption scroll information may be input to the graphic engine together with the media time information.
  • the graphics engine may generate caption text data as captions and output the caption text data to the display processor using information on caption scrolling and media time information.
  • the display processor may display the subtitles and provide them to the user.
  • FIG. 3 is a diagram illustrating an XML subtitle decoder including a scroll function according to an embodiment of the present invention. This embodiment may be similarly applied in that the head and the body of the XML subtitle are separately transmitted or represent elements to be newly processed in the head and the body even when the head and the body are simultaneously transmitted.
  • the XML subtitle decoder may include a head / body demultiplexer, an XML head buffer, an XML body buffer, a PTS / media time synchronizer, and an XML parser.
  • the XML subtitle decoder can receive XML subtitle elements.
  • the XML subtitle decoder can separate head and body elements using a head / body demultiplexer.
  • the receiver may store the separated head elements in an XML head buffer and store the separated body elements in an XML body buffer.
  • the elements related to scrolling for subtitles, ebutts: ScrollDirection, ebutts: ScrollType, ebutts: ScrollSpeed are passed through the head's ⁇ tt: ayout> or ⁇ tt: style> or ⁇ tt: metadata>, or ⁇ ebutts: Can be delivered via Scroll>.
  • the case of defining the EBU-TT-D has been described.
  • TTML metadata ttm
  • parameter ttp
  • style tts
  • the elements newly defined in the present invention can be extended to an XML-based subtitle standard such as TTML, EBU-TT, SMPTE-TT, CFF-TT, Youview, and EBU-TT.
  • the receiver may store them in the XML head buffer and refer to them according to the call of the body until new head information is stored.
  • the body to be transmitted in the future may mean a body to be transmitted until the next random access point (RAP).
  • RAP random access point
  • storing the new head information may mean an operation occurring in the next RAP.
  • Information about the subtitle scrolling stored in the buffer can be delivered to the XML parser when the PTS / Media Time Synchronizer reaches the specified time.
  • the XML parser can parse XML subtitles with scrolling.
  • the ⁇ tt: body> included in the XML subtitle can directly specify subtitle scrolling information.
  • ⁇ Tt: body> may also include subtitle scrolling related information in a region or style feature. You can also call the scroll feature from ⁇ tt: body>, ⁇ tt: div> or ⁇ tt: p>. Through this, information about the direction, type, and speed of the caption assigned to the head or body can be used.
  • the graphic engine described above may execute a scrolling function by configuring a subtitle to be displayed on the screen in each frame. For example, in the case of upward line scrolling, if the contents of the first line are filled in a predetermined region, a caption image is generated by deleting the line after the predetermined speed and shifting the contents of the next line upward. Can be shown in the next frame.
  • the broadcast transmission device may define scroll characteristics in the entire region by defining information on subtitle scrolling in ⁇ tt: layout> of ⁇ tt: head> included in the XML subtitle.
  • the XML caption can define scrolling characteristics in ⁇ tt: region> for each region, and the region is set to region 1 in the drawing. This way, if you have multiple regions, you can define different scroll characteristics for each region.
  • XML subtitles can be defined only for a specific style of scrolling properties, for the head / body as a whole, or only for certain divs (division) and p (paragraph). Detailed embodiments thereof will be described later.
  • XML subtitles can consist of a head and a body, where the head can define styling.
  • the styling may define an identifier, a caption color, and a background color of the corresponding style, and may include information about the direction in which the caption is displayed or the alignment reference direction. That is, as shown, the identifier of the style in the XML caption information may be set to BaseStyle, the caption color is red, and the background color is yellow. Also, the direction in which the subtitles are displayed in the XML subtitle information may be set to left to right (ltr), and the text alignment may be aligned based on left.
  • the layout may define a region and may include information about the region identifier, subtitle writing mode, scroll direction, scroll type, and scroll speed. That is, as shown, the region identifier may be defined as region1, the subtitle writing mode may be defined as left to right, top to bottom (lrtb), and the scroll direction may be defined as Bottom2Top.
  • the scroll type may be defined as line 1, and the scroll speed may be defined as 3.
  • the body can select the style and region to use in the division, select the BaseStyle defined by the head, and select region1 as shown.
  • the body may include subtitle text information and may define a display start time and an end time of each subtitle text. Through this, each subtitle text can be displayed using BaseStyle in region1, which is a designated region from a defined start time to an end time.
  • FIG. 5 shows information about subtitle scrolling according to an embodiment of the present invention.
  • various scroll directions are defined, and the scroll directions may be used in other standards.
  • a scrolling direction may be used in the CEA 708 standard.
  • information on scrolling of the subtitle may define an alignment criterion, a print direction, and a scroll direction.
  • the subtitle scrolling information may be set to the left, right, or center of the alignment criteria.
  • the subtitle scrolling information may set a direction from top to bottom or top to bottom or top to bottom with respect to the print direction.
  • the subtitle scrolling information may set a direction from bottom to top, top to bottom, right to left, or left to right with respect to the scroll direction.
  • the specific criteria and directions included in the above-described alignment criteria, print directions, and scroll directions may be combined with each other to configure information about the subtitle scrolling.
  • the XML caption information according to the present invention may support the above-described alignment criteria, print direction, and scroll direction in various ways.
  • XML subtitles can specify the scroll direction, scroll type, and scroll speed as attributes of the layout ⁇ tt: layout>.
  • the scroll direction of the XML subtitle may be defined by ⁇ ebutts: ScrollDirection>, the scroll type by ⁇ ebutts: ScrollType>, and the scroll speed by ⁇ ebutts: ScrollSpeed>. See below for a detailed description of each attribute.
  • (a) is an embodiment of scroll direction information.
  • the information on the scroll direction may be expressed by ScrollDirection and may indicate a direction in which scrolling is progressed.
  • ScrollDirection scrolls from bottom to top (Top2 Bottom), scrolls from top to bottom (Bottom2Top), scrolls from left to right (Left2Right), scrolls from right to left (Right2Left) In the case of specifying.
  • (b) is one embodiment for the scroll type.
  • Information about the scroll type can be expressed as a ScrollType and can specify how to scroll.
  • the case of scrolling in units of lines that can be used for vertical scrolling (Line) and the case of scrolling in units of pixels that can be used in both horizontal or vertical directions (Pixel) are considered.
  • the receiver scrolls the caption line by line, it can also convey information (LineNumber) about how many lines are processed when scrolling.
  • the receiver may scroll the subtitle pixel by pixel in order to create a pushing effect, and may transmit information about the number of pixels (PixelNumber) associated with the natural scrolling effect.
  • the number of pixels associated with the natural scrolling effect may mean the number of horizontal lines in the case of vertical scrolling.
  • LineNumber or PixelNumber is not present or 0, the default value can be used by specifying that scrolling is performed after the region is full of characters.
  • the scroll type information may specify a LineType to specify a type in which the line disappears when scrolling is performed line by line.
  • LineType is selected by selecting an animation effect in which the line disappears normally (Normal), left (Left) or right (Right), or disappears after a certain time flickering (Flicker). Can be specified.
  • ScrollSpeed is one embodiment for scrolling speed.
  • Information about the scroll speed may be expressed as ScrollSpeed, and may be used to indicate the scroll speed when the scroll function is used.
  • ScrollSpeed can be used to express the scrolling speed in lines when the subtitle scrolls vertically. In other words, if ScrollSpeed is set to 3 seconds, the current line disappears and is replaced by one line after 3 seconds after all the top lines are filled. As another embodiment, when the ScrollSpeed is set to 3 seconds, the current line disappears and is replaced by a line above one line after 3 seconds after all the lowest lines are filled.
  • the definition of speed is not limited to the above example, and may be used according to the definition of scroll speed. Units can be based on seconds, or even to the nearest decimal point for more detail.
  • the broadcast transmission device may define information on subtitle scrolling in ⁇ tt: metadata> of ⁇ tt: layout> of ⁇ tt: head> included in an XML subtitle. That is, subtitle scrolling information that is equally applied to the entire layout instead of a specific region may be defined. In other words, the same elements can be applied to the whole area by defining scroll-related properties in the layout.
  • XML subtitles can consist of a head and a body, where the head can define styling.
  • the styling may define an identifier, a caption color, and a background color of the corresponding style, and may include information about the direction in which the caption is displayed or the alignment reference direction. That is, as shown, the identifier of the style in the XML caption information may be set to BaseStyle, the caption color is red, and the background color is yellow. Also, the direction in which the subtitles are displayed in the XML subtitle information may be set to left to right (ltr), and the text alignment may be aligned based on left.
  • the layout may include metadata about caption scrolling and may include information about scroll direction, scroll type, and scroll speed. That is, as shown, the scroll direction may be defined as Bottom2Top, the scroll type is defined as line 1, and the scroll speed is defined as 3.
  • the layout may include a region and may include information about a region identifier and a subtitle writing mode. That is, as shown, the region identifier may be defined as region1, and the subtitle writing mode may be defined as left to right and top to bottom (lrtb).
  • the body can select the style and region to use in the division, select the BaseStyle defined by the head, and select region1 as shown.
  • the body may include subtitle text information and may define a display start time and an end time of each subtitle text. Through this, each subtitle text can be displayed using BaseStyle in region1, which is a designated region from a defined start time to an end time.
  • the subtitle text may be scrolled according to the subtitle scrolling information defined in ⁇ tt: metadata> of ⁇ tt: layout>.
  • both the start time and the end time of the subtitle are displayed.
  • the subtitle may be defined without the end time. If there is no end time, the last subtitle before the current point in time may remain on the screen if the region is defined and no other subtitles are defined at the same location over time.
  • the scroll speed may be defined so that the subtitle disappears after a certain time.
  • the broadcast transmission device may define information on subtitle scrolling in ⁇ tt: metadata> of ⁇ tt: head> included in an XML subtitle. That is, subtitle scrolling information that is equally applied to all regions and all styles may be defined while a head other than a specific layout is defined. In other words, by defining scroll-related attributes in the head, the same element can be applied to all regions and all styles.
  • Such an embodiment may be used to deliver scroll information corresponding to the entire subtitle when all the information for the XML subtitle is transmitted in the RAP.
  • XML subtitles can consist of a head and a body, where the head can define styling.
  • the styling may define an identifier, a caption color, and a background color of the corresponding style, and may include information about the direction in which the caption is displayed or the alignment reference direction. That is, as shown, the identifier of the style in the XML caption information may be set to BaseStyle, the caption color is red, and the background color is yellow. Also, the direction in which subtitles are displayed in the XML subtitle information may be set to left to right (ltr), and the text alignment may be aligned based on left.
  • the layout may include a region and may include information about a region identifier and a subtitle writing mode. That is, as shown, the region identifier may be defined as region1, and the subtitle writing mode may be defined as left to right and top to bottom (lrtb).
  • the head may define metadata.
  • the head may directly include metadata about the subtitle scrolling and may include information about the scroll direction, the scroll type, and the scroll speed. That is, as shown, the scroll direction may be defined as Bottom2Top, the scroll type is defined as line 1, and the scroll speed is defined as 3.
  • the body can select the style and region to use in the division, select the BaseStyle defined by the head, and select region1 as shown.
  • the body may include subtitle text information and may define a display start time and an end time of each subtitle text. Through this, each subtitle text can be displayed using BaseStyle in region1, which is a designated region from a defined start time to an end time.
  • the subtitle text may be scrolled according to the subtitle scrolling information defined in ⁇ tt: metadata> of ⁇ tt: head>.
  • both the start time and the end time of the subtitle are displayed.
  • the subtitle may be defined without the end time. If there is no end time, the last subtitle before the current point in time may remain on the screen if the region is defined and no other subtitles are defined at the same location over time.
  • the scroll speed may be defined so that the subtitle disappears after a certain time.
  • the broadcast transmission device may define information on subtitle scrolling in ⁇ tt: metadata> of ⁇ tt: body> included in an XML subtitle. That is, as shown, the subtitle scroll information may be defined in the body itself.
  • the subtitle scroll information may be defined in the body itself.
  • metadata in ⁇ tt: div> scrolling characteristics by subtitle scrolling information can be applied only to the corresponding division. If defined as metadata in ⁇ tt: body>, all paragraphs in the body ( division).
  • XML subtitles can consist of a head and a body, where the head can define styling.
  • the styling may define an identifier, a caption color, and a background color of the corresponding style, and may include information about the direction in which the caption is displayed or the alignment reference direction. That is, as shown, the identifier of the style in the XML caption information may be set to BaseStyle, the caption color is red, and the background color is yellow. Also, the direction in which subtitles are displayed in the XML subtitle information may be set to left to right (ltr), and the text alignment may be aligned based on left.
  • the layout may include a region and may include information about a region identifier and a subtitle writing mode. That is, as shown, the region identifier may be defined as region1, and the subtitle writing mode may be defined as left to right and top to bottom (lrtb).
  • the body can select the style and region to use in the division, select the BaseStyle defined by the head, and select region1 as shown.
  • the body can also define subtitle scrolling characteristics for use in the division.
  • Bodies can define metadata in ⁇ tt: div>.
  • the body may directly include metadata about the caption scrolling and may include information about the scroll direction, the scroll type, and the scroll speed. That is, as shown, the scroll direction may be defined as Bottom2Top, the scroll type is defined as line 1, and the scroll speed is defined as 3.
  • the body may include subtitle text information and may define a display start time and an end time of each subtitle text.
  • each subtitle text can be displayed using BaseStyle in region1, which is a designated region from a defined start time to an end time.
  • the subtitle text may be scrolled according to the information on the subtitle scroll defined in ⁇ tt: metadata> in ⁇ tt: body>.
  • both the start time and the end time of the subtitle are displayed.
  • the subtitle may be defined without the end time. If there is no end time, the last subtitle before the current point in time may remain on the screen if the region is defined and no other subtitles are defined at the same location over time.
  • the scroll speed may be defined so that the subtitle disappears after a certain time.
  • FIG. 10 illustrates XML captions when smooth scrolling is implemented in an EBU-TT-D according to another embodiment of the present invention.
  • the broadcast transmission device may define information on subtitle scrolling using ⁇ tt: metadata> in ⁇ tt: styling> of ⁇ tt: head> included in an XML subtitle.
  • the same elements can be applied to the whole area by defining scroll-related properties in styling.
  • XML subtitles can consist of a head and a body, where the head can define styling.
  • the styling may define an identifier, a caption color, and a background color of the corresponding style, and may include information about the direction in which the caption is displayed or the alignment reference direction. That is, as shown, the identifier of the style in the XML caption information may be set to BaseStyle, the caption color is red, and the background color is yellow. Also, the direction in which subtitles are displayed in the XML subtitle information may be set to left to right (ltr), and the text alignment may be aligned based on left.
  • the styling may include metadata about subtitle scrolling characteristics and may include information about scroll direction, scroll type, and scroll speed. That is, as shown, the scroll direction may be defined as Bottom2Top, the scroll type is defined as line 1, and the scroll speed is defined as 3.
  • the layout may include a region and may include information about a region identifier and a subtitle writing mode. That is, as shown, the region identifier may be defined as region1, and the subtitle writing mode may be defined as left to right and top to bottom (lrtb).
  • the body can select the style and region to use in the division, select the BaseStyle defined by the head, and select region1 as shown.
  • the body may include subtitle text information and may define a display start time and an end time of each subtitle text. Through this, each subtitle text can be displayed using BaseStyle in region1, which is a designated region from a defined start time to an end time.
  • the subtitle text may be scrolled according to the information on the subtitle scroll defined in ⁇ tt: metadata> in ⁇ tt: styling>.
  • both the start time and the end time of the subtitle are displayed.
  • the subtitle may be defined without the end time. If there is no end time, the last subtitle before the current point in time may remain on the screen if the region is defined and no other subtitles are defined at the same location over time.
  • the scroll speed may be defined so that the subtitle disappears after a certain time.
  • FIG. 11 shows a definition for a caption scroll element according to another embodiment of the present invention.
  • the present embodiment does not define an attribute for subtitle scrolling, but includes information on scroll characteristics by defining an element called ⁇ ebutts: Scroll>, as shown in (a). It can be done. That is, after defining the element, as shown in (b), it is possible to simultaneously define the direction, speed, and type attributes for defining scroll characteristics in the element. In other words, the functions associated with scrolling can be defined simultaneously within ⁇ ebutts: Scroll>.
  • the ⁇ ebutts: Scroll> element may be defined as a container of scroll attributes. That is, the identifier ID may be defined as shown, as well as the direction, speed, and type defining the scroll characteristics. With this defined identifier, the caption scrolling function defined in the head can be called from the body to the ID. You can also apply scrolling to a specific time or sentence using an ID call.
  • the broadcast transmission device may define an ⁇ ebutts: Scroll> element including a scroll feature and an identifier in ⁇ tt: head> included in an XML caption.
  • the body can use the identifier to invoke the scrolling function and apply that scrolling characteristic to each subtitle text or division.
  • XML subtitles can consist of a head and a body, where the head can define styling.
  • the styling may define an identifier, a caption color, and a background color of the corresponding style, and may include information about the direction in which the caption is displayed or the alignment reference direction. That is, as shown, the identifier of the style in the XML caption information may be set to BaseStyle, the caption color is red, and the background color is yellow. Also, the direction in which subtitles are displayed in the XML subtitle information may be set to left to right (ltr), and the text alignment may be aligned based on left.
  • the layout may include a region and may include information about a region identifier and a subtitle writing mode. That is, as shown, the region identifier may be defined as region1, and the subtitle writing mode may be defined as left to right and top to bottom (lrtb).
  • ⁇ ebutts: Scroll> may include an identifier and subtitle scrolling attributes, and may include information about a scroll direction, a scroll type, and a scroll speed. That is, as shown, the scroll direction for the identifier scroll1 may be defined as Bottom2Top, the scroll type is defined as line 1, and the scroll speed may be defined as 3. In addition, as shown, the scroll direction for the identifier scroll2 may be defined as Bottom2Top, the scroll type is defined as line 1, and the scroll speed may be defined as 6.
  • the body can select the style and region to use in the division, select the BaseStyle defined by the head, and select region1 as shown.
  • the body may define a scroll identifier within division, and a scroll characteristic defined together with the scroll identifier may be commonly applied to subtitle text included in division. That is, when scroll1 is selected in division as shown in the drawing, the subtitle texts included in the division are scrolled by applying bottom 2Top, scroll type line 1, and scroll speed 3, which are the scroll directions identified by scroll1. Can be.
  • the body may include subtitle text information and may define a display start time and an end time of each subtitle text.
  • each subtitle text can be displayed using BaseStyle in region1, which is a designated region from a defined start time to an end time.
  • the subtitle text may be scrolled according to the information on the subtitle scrolling called by ⁇ tt: div>.
  • the text included in the paragraph may have a scroll characteristic identified by the separate scroll identifier.
  • the text “Be the good girl you always have to be” can be scrolled by the scrolling property identified by scroll2, that is, the text is below the scroll direction identified by scroll2.
  • Scroll type line 1 and scroll speed 6 are applied to scroll.
  • both the start time and the end time of the subtitle are displayed.
  • the subtitle may be defined without the end time. If there is no end time, the last subtitle before the current point in time may remain on the screen if the region is defined and no other subtitles are defined at the same location over time.
  • the scroll speed may be defined so that the subtitle disappears after a certain time.
  • the broadcast transmitter 1701 may include an encoder 1702, a multiplexer 1703, and / or a transmitter 1704.
  • the resolution of video data input to the broadcast transmitter 1701 may be UHD, HD, or SD.
  • the caption information input to the broadcast transmitter 1701 may be written in XML.
  • Video data input to the broadcast transmitter 1701 may be encoded by the encoder 1702.
  • the transmitting end may use HEVC (High Efficiency Video Coding) as an encoding method for video data.
  • the transmitting end may synchronize the encoded video data and the XML subtitle and multiplex using the multiplexer 1703.
  • the XML caption may include scroll characteristic information on the caption, and may include at least one of a direction, a speed, a type, or an identifier of the caption scroll.
  • the transmitter 1704 may transmit the transport stream output from the multiplexer 1703 as a broadcast signal.
  • the transport stream may be transmitted as a broadcast signal after being channel coded and modulated before transmission.
  • the broadcast receiver 1801 may include a receiver 1802, a demultiplexer 1803, and / or a decoder 1804.
  • the broadcast signal received by the receiver 1802 may be demodulated and then channel decoded.
  • the channel decoded broadcast signal may be input to the demultiplexer 103 and demultiplexed into a video stream and a subtitle stream.
  • the output of the demultiplexer may be input to the decoder 1804.
  • the decoder may include a video decoder and an XML parser. That is, the video stream may be decoded by the video decoder, the subtitle stream by the subtitle decoder, or parsed by an XML parser and output as video data and subtitle data, respectively.
  • Subtitle data can be scrolled using information about subtitle scrolling.
  • the caption scroll information included in the XML-based caption data may include at least one of scroll direction, speed, type, or identifier.
  • the decoder may generate and scroll subtitles based on such subtitle scrolling information. Video and subtitles can be synchronized and displayed by the receiver.
  • the broadcast receiver includes a receiver 1901, a demodulator 1902, a demultiplexer 1803, a video decoder 1904, an XML subtitle decoder 1905, an audio / video subtitle synchronizer (A / V / S sync, 1906), It may include a system information processor (SI processor) 1907, a graphics engine 1908, and / or a display processor 1909.
  • SI processor system information processor
  • the receiver 1901 may receive a broadcast signal transmitted by a transmitter.
  • the received broadcast signal may be input to the demodulator 1902.
  • the demodulator 1902 can demodulate a broadcast signal and output a transport stream (TS).
  • the TS may be input to the demultiplexing unit 1903 and demultiplexed.
  • the demultiplexed TS may include a HEVC bitstream, an XML subtitle, and system information (SI).
  • SI system information
  • the XML subtitle may include metadata.
  • the video decoder 1904 may receive an HEVC bitstream, decode it, and output a video frame.
  • the XML subtitle decoder 1905 may receive an XML subtitle and extract a subtitle.
  • the XML subtitle decoder 1905 may perform a scroll function for parsing metadata about the subtitle scroll included in the XML subtitle.
  • the metadata about the subtitle scroll may include at least one of a scroll direction, a speed, a type, or an identifier of the subtitle scroll.
  • Metadata for subtitle scrolling can apply subtitle scrolling characteristics to specific regions, divisions, or paragraphs, depending on their position within the XML subtitle.
  • the metadata for subtitle scrolling may be defined in a header to apply a subtitle scrolling characteristic to the entire subtitle.
  • the XML subtitle decoder can pass this metadata along with the subtitles to the graphics engine.
  • the system information processor 1907 may extract the OSD information by receiving the system information (SI) information output from the demultiplexer.
  • SI system information
  • the graphics engine 1908 may receive captions and caption metadata from the XML caption decoder 1905 and output caption images.
  • the caption image is generated based on the caption and the metadata of the caption, and at least one of a scroll direction, a speed, or a type of the displayed caption may vary according to scroll characteristics included in the caption metadata.
  • the display processor 1909 may receive the video frame and the subtitle and output the display frame.
  • the display processor 1909 may receive OSD (On Screen Display) information in addition to the video frame and the subtitle to output the display frame.
  • the output display frame may be displayed by the image output device, and the XML caption and video frame described in the present invention may be displayed together.
  • the method for transmitting a broadcast signal including the XML caption includes generating a video data by encoding a video stream (S2210), generating a broadcast signal including the generated video data and the caption information (S2220), and generating the broadcast. It may include the step of transmitting a signal (S2230).
  • Generating video data by encoding the video stream may receive a video stream having a resolution of UHD, HD, or SD, and encode the video stream to generate video data.
  • the video stream may be encoded by High Efficiency Video Coding (HEVC).
  • HEVC High Efficiency Video Coding
  • XML caption data can be generated.
  • the XML caption data may include metadata and the metadata may include data about scrolling characteristics of the caption. That is, the metadata may include at least one of a scroll direction, a scroll speed, a scroll type, or a scroll information identifier.
  • Generating a broadcast signal including the generated video data and subtitle data may build a broadcast signal frame and generate a broadcast signal using a modulation process.
  • the generated broadcast signal may be transmitted as a broadcast signal.
  • a method for receiving a broadcast signal including XML captions includes receiving a broadcast signal (S2310), demultiplexing the received broadcast signal into video data and caption data (S2320), and decoding the video data and caption data. Step S2330 may be included.
  • the broadcast signal received using the receiver may be demodulated and then channel decoded.
  • Demultiplexing the received broadcast signal into video data and caption data may demultiplex the channel decoded broadcast signal into video data and caption data using a demultiplexer.
  • Decoding the video data and the caption data, respectively may decode the video data and obtain the video data using the video decoder.
  • the caption data may be acquired using a caption decoder or an XML parser.
  • the receiver may extract the caption by receiving the XML subtitle.
  • the receiver may acquire information about scroll characteristics to parse metadata included in the XML subtitle.
  • the receiver may perform a scroll function for the caption using a scroll direction, scroll speed, scroll type, or scroll information identifier for the caption.
  • Apparatus and method according to the present invention is not limited to the configuration and method of the embodiments described as described above, the above-described embodiments may be selectively all or part of each embodiment so that various modifications can be made It may be configured in combination.
  • the image processing method of the present invention can be implemented as a processor-readable code on a processor-readable recording medium provided in the network device.
  • the processor-readable recording medium includes all kinds of recording devices that store data that can be read by the processor. Examples of the processor-readable recording medium include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, and the like, and may also be implemented in the form of a carrier wave such as transmission over the Internet. .
  • the processor-readable recording medium can also be distributed over network coupled computer systems so that the processor-readable code is stored and executed in a distributed fashion.
  • the present invention has industrial applicability that is usable and repeatable in the field of broadcast and video signal processing.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

La présente invention concerne un dispositif et un procédé d'émission/réception d'un signal de diffusion numérique comprenant un service de sous-titrage. Un mode de réalisation de la présente invention concerne un procédé de transmission d'un signal de diffusion, qui comporte les étapes consistant à : générer un signal de diffusion comprenant des données vidéo et des données de sous-titrage ; et transmettre le signal de diffusion généré. Le mode de réalisation de la présente invention permet de transmettre un flux de transmission qui fournit un service de sous-titrage de diffusion numérique utilisant des sous-titres XML.
PCT/KR2015/008093 2014-09-04 2015-08-03 Procede et dispositif d'emission/reception d'un signal de diffusion WO2016036012A1 (fr)

Applications Claiming Priority (2)

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US62/045,566 2014-09-04

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010095838A2 (fr) * 2009-02-17 2010-08-26 삼성전자 주식회사 Procédé et appareil de traitement d'image graphique
US20100220175A1 (en) * 2009-02-27 2010-09-02 Laurence James Claydon Systems, apparatus and methods for subtitling for stereoscopic content
US20110019088A1 (en) * 2008-04-17 2011-01-27 Daisuke Kase Digital television signal processor and method of displaying subtitle
US20110242104A1 (en) * 2008-12-01 2011-10-06 Imax Corporation Methods and Systems for Presenting Three-Dimensional Motion Pictures with Content Adaptive Information
WO2011129631A2 (fr) * 2010-04-14 2011-10-20 삼성전자 주식회사 Procédé et appareil pour générer un flux binaire de diffusion pour une diffusion numérique avec des sous-titres, et procédé et appareil pour recevoir un flux binaire de diffusion pour une diffusion numérique avec des sous-titres

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110019088A1 (en) * 2008-04-17 2011-01-27 Daisuke Kase Digital television signal processor and method of displaying subtitle
US20110242104A1 (en) * 2008-12-01 2011-10-06 Imax Corporation Methods and Systems for Presenting Three-Dimensional Motion Pictures with Content Adaptive Information
WO2010095838A2 (fr) * 2009-02-17 2010-08-26 삼성전자 주식회사 Procédé et appareil de traitement d'image graphique
US20100220175A1 (en) * 2009-02-27 2010-09-02 Laurence James Claydon Systems, apparatus and methods for subtitling for stereoscopic content
WO2011129631A2 (fr) * 2010-04-14 2011-10-20 삼성전자 주식회사 Procédé et appareil pour générer un flux binaire de diffusion pour une diffusion numérique avec des sous-titres, et procédé et appareil pour recevoir un flux binaire de diffusion pour une diffusion numérique avec des sous-titres

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