KR101285906B1 - Method and Apparatus for Recording and Reproducing of Broadcasting Signal capable of Searching Caption Data - Google Patents

Abstract

According to the present invention, after the caption information carried in the broadcast signal is stored in correspondence with the image information, the user can search the stored caption, and when the user selects the caption, the video corresponding to the position of the selected caption is reproduced. Fine-tune the playback of video and make subtitles more convenient.

Broadcast, subtitles, captions, navigation, video, playback

Description

Method and Apparatus for Recording and Reproducing of Broadcasting Signal capable of Searching Caption Data}

1 shows an embodiment of a broadcast recording and reproducing method according to the present invention;

2 illustrates an embodiment of configuring a caption search screen;

3 illustrates an embodiment of a broadcast recording / playback apparatus according to the present invention;

4 is a diagram illustrating an example of configuring an input signal processor.

DESCRIPTION OF THE REFERENCE NUMERALS

21: Video output screen 22: Subtitle search screen

30: broadcast recording and playback apparatus 31: input signal processing unit

32: caption signal processor 33: MPEG decoder

34: video display control unit 35: user interface unit

36: control unit 37: storage

38: display module 41: tuner unit

42: converter 43: MPEG encoder

The present invention relates to a broadcast recording and playback method and apparatus capable of searching for subtitles. In particular, the present invention relates to a caption information stored in a broadcast signal in correspondence with video information, and then allows the user to search for stored subtitles. By reproducing the video corresponding to the position of the selected subtitle, it is possible to more conveniently use various broadcast recording and reproducing apparatuses capable of recording and playing back images.

Currently, most broadcast signals include caption information that can be displayed on a TV device or other display device. Closed caption, which is a type of subtitle, may include dialogue of performers or various additional information. In addition, subtitles have a wide range of applications such as being able to assist the hearing impaired viewers in addition to the purpose of simply translating foreign language lines into Korean.

Such subtitles are generally encoded in a vertical blanking interval (VBI) of a video signal among broadcast signals, and in various image processing apparatuses that receive a broadcast and display it on a display screen, such as a TV device, the caption information Decode and output.

Meanwhile, attempts have been made to enable subtitles to be used in various fields in addition to a function of displaying a subtitle while simultaneously watching a video as in the related art. As an example, subtitles composed of English dialogue can serve as a very good learning textbook for users who want to learn a foreign language.

In addition, with the development of related technologies, a personal video recorder (PVR) or an already stored video program can be stored in a storage medium that is easy to store and retrieve, such as a hard disk drive (HDD) or a flash memory, and can be played back whenever necessary. A variety of broadcast recording and reproducing apparatuses, such as a recorder having a time machine, can be used to conveniently record and use a past machine so that the past broadcast can be viewed again without interruption. Therefore, there is a need to make it easier to use subtitles in such a broadcast recording / playback apparatus.

Accordingly, the present invention has been made in order to meet the necessity as described above, and the user can independently search the stored subtitle after storing the subtitle information carried in the broadcast signal in correspondence with the image information, and the user selects the subtitle. Accordingly, an object of the present invention is to provide a broadcast recording and reproducing method and apparatus capable of searching for subtitles that can reproduce an image corresponding to a position of a selected subtitle.

In order to achieve the above object, a broadcast recording and playback method capable of searching for subtitles according to the present invention, the broadcast recording and playback device receiving a broadcast signal; Storing image information and subtitle information included in the received broadcast signal in correspondence with each other; Outputting the stored subtitle information through a display module to search for subtitle information and to select a desired subtitle; And outputting image information corresponding to the selected subtitle through the display module.

The information to be stored together with the caption information to correspond to the video information includes information for identifying a broadcast program itself and information for designating video information to be played together with the caption.

The step of allowing the subtitle information to be searched may be configured to display a screen for searching the subtitle and a screen for outputting an image corresponding to the currently selected subtitle.

When the user selects a desired subtitle, it may be configured to select and select a section.

The caption information may be configured to be stored at every predetermined time interval. In this case, the predetermined time interval may be set to a time interval in which the same subtitle is maintained.

In accordance with another aspect of the present invention, a broadcast recording and reproducing apparatus capable of searching for a caption includes: an input signal processor configured to receive an analog broadcast signal, MPEG encode video information, and store the encoded video information in a storage; A caption signal processor extracting caption information included in the broadcast signal and storing the caption information in the storage together with the video indication information indicating the video information; An MPEG decoder for decoding MPEG encoded image information; A video display controller configured to synthesize an output signal and an additional signal of the MPEG decoder and output the synthesized signal to a display module; A user interface unit allowing a user to input a control signal; And comprehensively controlling the components according to the user input signal, searching the subtitle information stored in the storage to select a desired subtitle, and the MPEG decoder indicates that the corresponding video indication information among the image information stored in the storage is indicated. And a control unit for controlling to decode the image information.

The input signal processor may include a tuner unit for receiving an analog broadcast signal of a channel selected under the control of the controller, a converter unit for converting a signal received through the tuner unit into a digital signal, and a video signal output from the converter unit. It may include an MPEG encoder for MPEG encoding and storing in the storage in the form of a transport stream (TS).

The controller may be configured to display a screen for searching for the caption and an image corresponding to the currently selected caption.

The controller may be configured to select and select a section when the user selects a desired subtitle.

The caption information and the image indication information may be configured to be stored at predetermined time intervals. In this case, the predetermined time interval may be set to a time interval in which the same subtitle is maintained.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 1, an embodiment of a broadcast recording / playback method capable of searching for subtitles according to the present invention will be described. A broadcast recording / playback apparatus capable of recording and playing back broadcasts receives broadcast signals from various broadcast media (S11). In this case, the broadcast signal may be received through various broadcast media such as terrestrial broadcast, cable broadcast, satellite broadcast, and the broadcast signal may be an analog broadcast signal or a digital broadcast signal.

Then, the broadcast recording / reproducing apparatus extracts subtitle information included in the received broadcast signal and stores the subtitle information corresponding to the corresponding video information (S12).

Here, storing the caption information in correspondence with the image information means that it is possible to specify what caption should appear when each image information is output. The image information may be stored in various forms. For example, the image information may be stored in a transport stream (TS) compressed by an MPEG method. In addition, the caption decoder decodes the caption information included in the broadcast signal and stores the caption information along with information that can be associated with the image information.

Hereinafter, the subtitle search information will be referred to as subtitle search information. That is, the subtitle search information includes not only the subtitle information itself but also information indicating the video information that should appear when the subtitle information is output. Therefore, the subtitle search information includes information for designating a broadcast program related to the subtitle information and position information of the video information to be played back (for example, information that can indicate what video information such as a frame number or a time to be played back). It may include.

On the other hand, the subtitle search information may be configured to store every predetermined time interval (for example, 4 ~ 5 seconds). This is because video information has data of about 30 frames per second, but one subtitle exists over a plurality of frames. In such an embodiment, the time interval in which the subtitle search information is to be stored may be set to a time interval in which the same subtitle is maintained. That is, it may be configured to store one subtitle search information corresponding to a section from when a subtitle appears and immediately before the next subtitle appears. At this time, the position of the image information indicated by the subtitle search information may be the first frame of the corresponding section.

When the user instructs subtitle search using a keypad or a remote controller (eg, a remote controller) provided in the broadcast recording / playback device itself, the user may search for subtitle information by displaying the subtitle information stored in step S12. Subtitles can be selected (S13). In operation S13, a screen for searching for subtitles may be displayed independently, or an image corresponding to the currently selected subtitle may be displayed together with the subtitle search screen.

Referring to FIG. 2, a subtitle search screen is described with reference to FIG. 2. Both a subtitle search screen 22 for searching for a subtitle and a screen 21 for outputting an image corresponding to a currently selected subtitle are output on a TV screen. You can print The subtitle search screen 22 shows the time at which playback is performed, the contents of the subtitles, the synchronous time for the video information, and the like, and a scroll bar for scrolling the subtitles is provided on the right side of the subtitle search screen 22. At the bottom of the subtitle search screen 22, a progress bar 23 indicating the progress of the current video is displayed. When the user selects a subtitle from the subtitle search screen 22, the progress bar 23 is also displayed. Move to that location.

In addition, the user may designate a section to reproduce the image on the subtitle search screen 22. For example, the user may select a section from point A to point B to instruct playback, or may instruct repeat playback of the section.

When the user selects a certain subtitle or a certain section through the step S13, the video information corresponding to the selected subtitle or the subtitle section is reproduced and output through the display module (S14). In operation S14, the corresponding image information may be found and reproduced by referring to the information on the location of the image information stored corresponding to the selected subtitle among the subtitle search information stored in the operation S12.

3, an embodiment of a broadcast recording / playback apparatus capable of searching for subtitles according to the present invention will be described.

The input signal processor 31 receives an analog broadcast signal and MPEG-encodes the video information. The encoded video information is decoded by the MPEG decoder 33 under the control of the controller 36 to display the display module 38. The encoded image information may also be stored in the storage 37. In this case, the MPEG encoded signal may be stored in the form of a transport stream TS.

Referring to FIG. 4, a specific embodiment constituting the input signal processing unit 31 will be described. The input signal processing unit 31 may include a tuner unit receiving an analog broadcast signal of a channel selected under the control of the control unit 36. 41), a converter 42 for converting a signal received through the tuner 41 into a digital signal, MPEG encoding the digital video signal output from the converter 42, It may be configured to include an MPEG encoder 43 to store in the storage 37 in the form.

The caption signal processor 32 extracts caption information from the broadcast signal and stores the caption information in the storage 37 together with the video indication information indicating the video information.

The image indication information is for enabling the user to search for image information corresponding to the selection of a specific subtitle later. The image indication information refers to information that can indicate image information that should appear when the subtitle information is output. Identification information designating a broadcast program related to the caption information and position information of the video information to be played back (for example, information that can inform what kind of video information such as a frame number or a time to be played back).

How to store the caption information and the image indication information can be implemented in a number of ways.

In this case, the caption information and the image indication information may be configured to be stored every predetermined time interval (for example, 4 to 5 seconds). This is because video information has data of about 30 frames per second, but one subtitle exists over a plurality of frames. In such an embodiment, the time interval for storing the caption information and the image indication information may be set to a time interval for maintaining the same caption.

In this regard, a specific embodiment will be described. Information for identifying a broadcast program when a video signal is encoded in the MPEG encoder 43, a frame number, time information (for example, 10 ms units) proceeding from the start of playback, and subtitles Video index information including information and the like may be continuously generated in units of video frames, and the video index information may be stored and managed as caption information and image indication information.

However, since the caption is mostly present over a plurality of frames during a predetermined time interval as described above, the caption information and the image indication information may be stored by grouping the caption into video index information units having the same caption information with reference to the video index information. In this case, each item to be stored may include a caption information field, a broadcast program identification information field, and position information (eg, a frame number) field of image information indicated by the first video index information among video index information having the corresponding caption information. Can be.

The storage 37 may be preferably configured by using a nonvolatile storage means such as a hard disk drive (HDD) or a flash memory.

The MPEG decoder 33 MPEG-decodes MPEG encoded video information, and the video display controller 34 synthesizes an output signal of the MPEG decoder 33 and various additional signals to display the module 38. Outputs to).

The user interface unit 35 allows a user to input a control signal through a keypad or a remote controller (remote control) provided in the broadcast recording / playback apparatus 30 itself, and transmits the input control signal to the controller 36. To pass. In addition, the user interface unit 35 may include an interface means in the form of a graphical user interface (GUI) for providing a user with various menus through the display module 38.

The controller 36 collectively controls the broadcast recording / playback apparatus 30 according to a user input signal input through the user interface unit 35. In particular, when the control signal input through the user interface unit 35 is a signal for instructing the subtitle search, the subtitle search screen for searching the subtitle information stored in the storage 37 may be output through the video display controller 34. To browse and select the desired subtitles.

The controller 36 controls the MPEG decoder 33 to decode the video information indicated by the video indication information related to the subtitle selected by the user on the subtitle search screen among the video information stored in the storage 37.

At this time, the controller 36 may be configured to display the caption search screen 22 and the image 21 corresponding to the currently selected caption so that the caption can be searched as shown in the example of FIG. 2. In addition, when the user selects a desired subtitle, the controller 36 may designate a section by selecting the section on the subtitle selection screen 22 or may repeatedly play the video corresponding to the selected section according to the user's instruction.

As described above, the subtitle information of the video stream is displayed on the screen in chronological order, so that the subtitle can be used more efficiently in video searching, contents grasping, and foreign language learning. In addition, the present invention can be applied as it is even when the caption information is provided as an image file. In particular, more sophisticated and detailed stream search and image control are possible than when using the progress bar, thereby providing excellent convenience for learning through video.

Claims (12)

Receiving, by the broadcast recording / playback apparatus, a broadcast signal; Storing image information and subtitle information included in the received broadcast signal in correspondence with each other; Outputting the stored subtitle information through a display module to search for the subtitle information and to select a desired subtitle; And Outputting image information corresponding to the selected subtitle through the display module; The information to be stored together with the caption information to correspond to the video information includes information for identifying a broadcast program itself and information for designating video information to be played together with the caption. Possible broadcast recording playback method. delete The method of claim 1, And searching for the caption information includes displaying a screen for searching the caption and a screen for outputting a video corresponding to the currently selected caption. The method of claim 1, When the user selects a desired subtitle, broadcast recording playback method capable of searching for a subtitle, characterized in that the section is configured to be selected. The method of claim 1, And the caption information is configured to be stored at a predetermined time interval. 6. The method of claim 5, And the predetermined time interval is configured to be set as a time interval during which the same subtitle is maintained. An input signal processor configured to receive an analog broadcast signal, MPEG encode the image information, and store the encoded image information in a storage; A caption signal processor extracting caption information included in the broadcast signal and storing the caption information in the storage together with the video indication information indicating the video information; An MPEG decoder for decoding MPEG encoded image information; A video display controller configured to synthesize an output signal and an additional signal of the MPEG decoder and output the synthesized signal to a display module; A user interface unit allowing a user to input a control signal; And According to a control signal input by a user, the subtitle information stored in the storage can be searched to select a desired subtitle, and the MPEG decoder decodes the image information related to the selected subtitle related video indication information among the image information stored in the storage. It includes a control unit for controlling to, And the caption information and the image indication information are configured to be stored at predetermined time intervals. The method of claim 7, wherein The input signal processor may include a tuner unit for receiving an analog broadcast signal of a channel selected under the control of the controller, a converter unit for converting a signal received through the tuner unit into a digital signal, and a video signal output from the converter unit. And a MPEG encoder for encoding MPEG and storing the storage in the storage in the form of a transport stream (TS). 9. The method according to claim 7 or 8, And the control unit is configured to display a screen for searching the subtitle and an image corresponding to the currently selected subtitle together. 9. The method according to claim 7 or 8, And the control unit is configured to select and select a section when the user selects a desired subtitle. delete The method of claim 7, wherein And wherein the predetermined time interval is set to a time interval in which the same subtitle is maintained.

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