JP5201251B2 - Information reproducing apparatus and information reproducing method - Google Patents

Information reproducing apparatus and information reproducing method Download PDF

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JP5201251B2
JP5201251B2 JP2011204072A JP2011204072A JP5201251B2 JP 5201251 B2 JP5201251 B2 JP 5201251B2 JP 2011204072 A JP2011204072 A JP 2011204072A JP 2011204072 A JP2011204072 A JP 2011204072A JP 5201251 B2 JP5201251 B2 JP 5201251B2
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display
time information
video
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JP2012050097A (en
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博樹 溝添
宅哉 今出
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株式会社日立製作所
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  The present invention relates to a decoding apparatus, a decoding method, and a disc-type recording medium that decode and display an encoded video signal.

  As background art of this technical field, for example, there is JP-A-2000-134572 (Patent Document 1). In this publication, there is a description “It outputs a video, audio, sub-picture, etc. to a digital TV receiver as a digital signal from a playback device such as a DVD player”. Further, as a solution, “The PCM audio signal decoded by the audio decoder 11 is converted into a packet by the PCM / 1394 packet converter 27 after the presentation time is adjusted by the presentation engine 17. The sub-picture is set to the presentation time by the presentation engine 17, and then converted to a packet by the 1394 packet conversion unit 29. The video PES is converted into TS by the MPEG-PS / TS conversion unit 25 together with the SCR, and the MPEG-TS / It is converted into a packet by the 1394 packet conversion unit 31. Each isochronous packet is sent to the digital TV via the link layer 33 and the physical layer 35. "

  Further, as background art in this technical field, for example, Non-Patent Document 1 is also available.

JP 2000-134572 A

ISO / IEC13818-2 (MPEG2 Video)

  A DVD (Digital Versatile Disc) player is widely used as a type of decoding display device that decodes and displays an encoded video signal. In the case of a DVD player, a bit stream is read from a disk storing an encoded video signal, and the video signal is decoded by a decoder in the player, and displayed.

  In a DVD, in addition to a main video (hereinafter referred to as a main video), it is possible to reproduce a sub video called a sub picture. In some cases, the sub-video is closely related to the main video and content. In such a case, it is desirable to display the main video and the sub-video in synchronization. For example, Patent Document 1 discloses a technique for displaying a main video and a sub-video in synchronization.

  On the other hand, when displaying the main video and the sub video in association with each other, it is convenient if the position and size of the sub video can be changed according to the content of the main video. For example, in FIG. 2A, the sub video is superimposed on the upper right in order to prevent the sub video from hiding the person in the main video. On the other hand, in FIG. 2B, the person in the main video has moved to the right side in the video. At this time, if the position of the sub-picture remains as shown in FIG. Therefore, if the display position of the sub-picture can be moved to the left as shown in FIG. 2B according to the movement of the person in the main picture, the person will not be hidden.

  In this example, the display position of the sub-video needs to be specified with careful consideration of consistency with the main video, so it is convenient if there is a mechanism that allows the main video content creator to specify the display position. In that case, it is necessary that the display position and display size can be specified with an accuracy of one frame unit. The same applies to the image size of the sub-picture.

  Non-Patent Document 1 discloses a technique for designating the display position and display size of an encoded video signal. In the above technique, information on the display position and the display size is inserted into the encoded video signal, and the display position can be specified in units of frames.

  By the way, the additional information for the sub-picture signal such as the display position and the display size is inherently strongly dependent on the application. In other words, there are various types of systems using encoded video signals, such as various storage media such as DVDs, broadcast systems, and distribution via the Internet, and the types of functions, types of additional information, and formats required for each. The transmission method is generally different.

  Therefore, if such additional information is analyzed and extracted by hardware, it becomes difficult to provide flexibility to cope with various applications. In addition, when a new application appears in the future, it is necessary to modify the hardware in order to cope with it, which increases costs.

  On the other hand, if additional information is analyzed and extracted by software, flexibility can be provided, and it is relatively easy to handle when a new application appears in the future. However, if processing is performed by software, the processing speed may not be in time, and there is a possibility that the above-described designation with the accuracy of one frame unit cannot be guaranteed.

  The present invention has been made in view of the above, and it is possible to designate the display position and display size of a sub-picture (secondary video, etc.) with accuracy of one frame unit, and to decode an encoded video signal having a flexible designation method. A display device is provided.

  The subject of this invention is improving the usability of a decoding apparatus.

  The above problems are solved by the invention described in the claims.

  According to the present invention, usability of the decoding device can be improved.

Block diagram of a decoding display device in one embodiment Explanatory drawing of the superimposition of the main image and the sub image in one embodiment Explanatory drawing of auxiliary information in one embodiment Block diagram of a decoding display device in one embodiment Explanatory drawing of auxiliary information in one embodiment Explanatory drawing of auxiliary information in one embodiment

  Embodiments of the present invention will be described below. Sub-pictures (such as sub-pictures) and the following sub-pictures (secondary videos and the like) in the DVD described in the background art and disclosure section are as follows. Is different. That is, the sub-picture in the DVD is intended for an image such as an OSD image in which the number of gradations is small compared to the main video and the image is updated irregularly in units of seconds. The sub-picture in is intended for a natural picture having the same number of gradations and frame rate as the main picture. In addition, due to the above characteristics, DVD sub-pictures are sufficiently practical with a simple encoding method such as run-length compression. However, sub-pictures in the following embodiments have inter-frame correlations typified by MPEG, etc., as with main pictures. It differs from DVD subpictures in that it uses a sophisticated video compression scheme that is utilized and therefore requires a decoder equivalent to the main video.

  FIG. 1 shows a block diagram of a video disk reproducing apparatus according to the first embodiment of the present invention. The disk 11 stores a main video, and the local storage 81 stores a sub video encoded video signal and auxiliary information. The encoded video signal of the main video read from the disk 11 is input to the decoder 21. The decoder 21 decodes the input encoded video signal, and the main video as a result is output to the display screen forming unit 71.

  Similarly, the encoded video signal of the sub video read from the local storage 81 is input to the decoder 22. The decoder 22 decodes the input encoded video signal and outputs the resulting sub-video to the display screen forming unit 71. The reference time counter unit 41 counts the reference time for decoding and outputs the reference time to the decoders 21 and 22, the display screen forming unit 71, and the comparison unit 51. The decoders 21 and 22 perform a decoding process based on the reference time output from the reference time counter unit 41. As a result, the decoding process can be performed by synchronizing the main video and the sub-video.

  Further, auxiliary information is read from the local storage 81. The read auxiliary information is sent to the auxiliary information analysis unit 31.

  The auxiliary information analysis unit 31 analyzes the auxiliary information, and extracts display auxiliary information related to the display position and display size of the sub-picture, and application time information to which the display auxiliary information is applied. The extracted display auxiliary information is sent to the control unit 61. The extracted application time information is sent to the comparison unit 51.

  Note that the analysis of the auxiliary information can be performed prior to the decoding process of the video signal, and thus the auxiliary information analysis process can be performed with a margin. Therefore, in this embodiment, part of the processing in the auxiliary information analysis unit 31 is realized by software processing.

  The processing in the auxiliary information analysis unit 31 will be described in further detail. FIG. 3 shows a part of the auxiliary information supplied to the auxiliary information analysis unit 31 in the form of a bit stream. The auxiliary information is divided in units of packets, and a packet header is inserted for each packet. Information relating to the display position of the sub-picture and information relating to the display size are respectively stored at predetermined positions in the packet, and each piece of information can be extracted by the CPU.

  The display size is configured by information on the number of pixels in the horizontal and vertical directions of the sub-picture when displaying.

  Next, the comparison unit 51 compares the application time information with the reference time input from the reference time counter 41, and outputs the comparison result to the control unit 61.

  The control unit 61 uses the display auxiliary information input from the auxiliary information analysis unit 31 to the display screen forming unit 71 when the comparison result input from the comparison unit 51 indicates “match”. Gives instructions on the video display position and display size.

  The display screen forming unit 71 synthesizes the main video and sub-video screens to form a display screen. At that time, the sub-picture is reduced or enlarged on the basis of the instruction content from the control unit 61 and converted into the designated image size. Furthermore, based on the content of the instruction from the control unit 61, the sub-video is superimposed at the position specified for the main video. The formed display screen is output from the video disk playback device as an image output. Then, after output from the decryption device 100, it is displayed on the display device 200.

  Thus, according to the present embodiment, it is possible to accurately apply the display position and display size of the sub-picture to the time designated by the application time information.

  Furthermore, since a part of the processing of the auxiliary information analysis unit 31 can be realized by software, even if the type and format of the additional information is changed according to various applications, it is possible to flexibly cope with it. Is possible. In the above description, the example in which the display size information is configured by the information of the horizontal and vertical number of pixels of the sub-picture at the time of display has been shown, but the sub-picture code is used instead of the pixel number information. You may comprise by the information of the magnification of the image size at the time of the display with respect to a digitized image size. In this case, the process for obtaining the reduction / enlargement ratio for the sub-picture can be omitted by calculating the ratio of the encoded picture size of the sub-picture to the image size at the time of display. In other respects, it is possible to obtain substantially the same effects as in the present embodiment.

  FIG. 4 shows a block diagram of a video disk reproducing apparatus according to the second embodiment of the present invention. A description of the same parts as those in the first embodiment will be omitted.

  In the present embodiment, unlike the first embodiment, an example in which the sub video and auxiliary information are recorded on the disk 11 together with the main video is shown. When the sub-picture and auxiliary information are recorded on the disk 11 as in the second embodiment, the sub-picture can be enjoyed even in an environment not connected to the network as will be described later. On the other hand, when recorded in the local storage 81 as in the first embodiment, for example, even when sub-pictures and auxiliary information are not recorded on the disk 11, after obtaining both information via a removable recording medium or network, You can enjoy sub-pictures. In addition, even when sub-pictures and auxiliary information are recorded on the disk 11, there is an advantage that the latest sub-pictures can be enjoyed after obtaining the latest information.

  In the present embodiment, the encoded video signal includes a frame ID for uniquely identifying each frame in the encoded information of each frame.

  The decoder 22 also extracts the frame ID of each frame and outputs it to the comparison unit 52 during the sub-picture decoding process.

  FIG. 5 shows a part of the auxiliary information input to the auxiliary information analysis unit 31. In place of the application time information in FIG. 3, application frame ID information is inserted. The application frame ID is extracted and output to the comparison unit 52.

  The comparison unit 52 compares the applied frame ID information with the frame ID of each frame input from the decoder 22 and outputs the comparison result to the control unit 61.

  With the above configuration, the same effect as that of the first embodiment can be obtained when the encoded video signal uses a system in which the frame ID for uniquely identifying each frame is included in the encoded information of each frame. Is possible.

  Next, a third embodiment of the present invention will be described. A description of the same contents as in the first embodiment will be omitted.

  The difference from the first embodiment is the content of the auxiliary information. In this embodiment, auxiliary information is given as a command to the CPU.

  FIG. 6 shows part of the auxiliary information supplied to the auxiliary information analysis unit 31. Thus, for example, a command such as JAVA (registered trademark) is given to the CPU. In the present invention, since a part of the processing of the auxiliary information analysis unit 31 is performed by software processing, it is possible to handle information smoothly by supplying auxiliary information in the form of commands in this way. There is an advantage. With respect to other points as well, it is possible to obtain the same effects as in the first embodiment.

  Next, a fourth embodiment of the present invention will be described. Only differences from the first embodiment will be described.

  The feature of this embodiment is that special effect information relating to movement of the display position of the sub-picture is included in the auxiliary information. Specifically, the horizontal movement amount dX of the sub-picture per unit time, the application start time t0 at which the application of the display position is started, and the application duration tLAST at which the movement of the display position is applied are included in the auxiliary information. Is included. Thus, if the display position of the horizontal sub-picture at time t0 is x0, the display position of the horizontal sub-picture at time t0 + t (0 ≦ t ≦ tLAST) can be expressed as x0 + t × dX.

  The same applies to the vertical direction. It is assumed that the time information used here has a resolution that can specify a time with an accuracy of at least one frame unit.

  The advantage of the present embodiment is that when the sub-picture moves continuously at a constant speed, the amount of auxiliary information necessary to specify the position of the sub-picture can be reduced, and therefore a disk for storing the auxiliary information. It is possible to reduce the capacity.

  Note that the number of frames may be considered instead of the time / time concept described above. That is, instead of “per unit time”, “application start time”, and “application duration”, information of “per frame”, “application start frame ID”, and “number of application continued frames” may be used, respectively. It is possible to obtain the same effect.

Next, a fifth embodiment of the present invention will be described. Only differences from the first embodiment will be described.

  The feature of this embodiment is that special effect information relating to movement of the display position of the sub-picture is included in the auxiliary information. Specifically, the horizontal movement amount dX of the sub-picture per unit time, the application start time t0 at which the application of the display position is started, and the application end time tE at which the movement of the display position is applied are included in the auxiliary information. Is included. Thus, if the display position of the horizontal sub-picture at time t0 is x0, the display position of the horizontal sub-picture at time t0 + t (0 ≦ t ≦ tE−t0) can be expressed as x0 + t × dX. .

  The same applies to the vertical direction.

  The advantage of the present embodiment is that when the sub-picture moves continuously at a constant speed, the amount of auxiliary information necessary to specify the position of the sub-picture can be reduced, and therefore a disk for storing the auxiliary information. It is possible to reduce the capacity.

  Note that the number of frames may be considered instead of the time / time concept described above. That is, instead of “per unit time”, “application start time”, and “application end time”, information of “per frame”, “application start frame ID”, and “application end frame ID” may be used, respectively. It is possible to obtain the same effect.

Next, a sixth embodiment of the present invention will be described. Only differences from the first embodiment will be described.

  The feature of this embodiment is that special effect information relating to the change of the display size of the sub-picture is included in the auxiliary information. Specifically, the sub information display magnification change amount dS per unit time, the application start time t0 at which the application of the display size change starts, and the application duration tLAST at which the display size change is applied are included in the auxiliary information. Is included. Thus, if the display size (magnification) of the horizontal sub-picture at time t0 is S0, the display size (magnification) at time t0 + t (0 ≦ t ≦ tLAST) can be expressed as S0 + t × dS.

  The advantage of this embodiment is that when the sub-picture is continuously enlarged (zoom-in) or reduced (zoom-out) at a constant speed, the code amount of the auxiliary information necessary for specifying the display size of the sub-picture can be reduced. Therefore, it is possible to reduce the disk capacity for storing auxiliary information.

  Note that the number of frames may be considered instead of the time / time concept described above. That is, instead of “per unit time”, “application start time”, and “application duration”, information of “per frame”, “application start frame ID”, and “number of application continued frames” may be used, respectively. It is possible to obtain the same effect.

  While the first to fifth embodiments have been described with reference to the example of the video disk playback device, the present invention is not limited to this. For example, the same effect can be expected in a receiver in which encoded video is transmitted by radio wave or wire. For example, in the case of a movie or the like, when playing a main movie with respect to a main video, a sub-video related to the main video scene is acquired via a network, decoded by a display device, and then synchronized with the main video. Alternatively, it is possible to superimpose and enjoy a movie as a secondary video of a scene related to the main part.

  Other embodiments include a first input unit to which a first encoded video signal is input, a second input unit to which a second encoded video signal is input, and the first encoded video. A first decoding unit for decoding a signal, a second decoding unit for decoding the second encoded video signal, and a video signal decoded by the first and second decoding units. An output unit that outputs the video signal to be displayed on the display unit, and a control unit that controls information on a display position and / or a display size of the video signal decoded by the second decoding unit on the display unit. The video signal decoded by the second decoding unit under the control of the control unit is also decoded by a decoding device that controls to display the video signal decoded by the first decoding unit. Usability in the device can be improved. The information on the display position and / or display size on the display means includes information on time, and the control unit receives the video signal decoded by the second decoding unit based on the information on time. Usability in the decoding display device can also be improved by a decoded video display device that controls to display in synchronization with the video signal decoded by the first decoding unit. Further, the first encoded video signal is input, the second encoded video signal is input, the input first encoded video signal is decoded, and the input second encoded video signal is input. To control information related to the display position and / or display size on the display means of the decoded second decoded video signal, and to the information related to the display position and / or display size on the display means Correspondingly, the usability in the decoding method can be improved also by a decoding method in which the second decoded video signal is synchronized with the first decoded video signal and displayed. Also, a disc-type recording medium on which the first encoded video signal and the second encoded video signal are recorded, the first encoded video signal and the second encoded video signal being decoded, Decoding is also performed by a disk-type recording medium in which information about the display position and / or display size and timing of the second video signal is recorded so that the second video signal is displayed in synchronization with the first video signal. Usability in the device can be improved. A decoding device connectable with the display means, the first decoding unit for decoding the first encoded video, and the second decoding unit for decoding the second encoded video; An output unit for synchronizing and outputting the second decoded video to the display means when outputting the first decoded video to the display means; and the second decoding in synchronization with the first decoded video An analysis unit for analyzing auxiliary information related to a display position and / or display size of the second decoded video on the display unit and an application time thereof when outputting the converted video to the display unit, and the first decoding A time counter indicating the output time of the video, a comparison unit comparing the application time and the output time indicated by the counter, and comparing the second decoding video according to the comparison of the comparison unit and the auxiliary information. The output unit for outputting in synchronization with one decoded video A control unit for controlling may improve the usability by decoding apparatus having. A decoding device connectable with the display means, the first decoding unit for decoding the first encoded video, and the second decoding unit for decoding the second encoded video; An output unit that outputs the second decoded video to the display means in synchronization with the first decoded video; and information on the position, size, and application time that outputs the second decoded video to the display means And an output unit and a control unit that controls the acquisition unit, and the control unit adds the first decoded video to the first decoded video according to information acquired by the acquisition unit. Usability can also be improved by a decoding device that controls the output unit so that the second decoded video is superimposed and displayed on the display means. A decoding device connectable to the display device; a first decoding unit that decodes the first encoded video; and a second decoding unit that decodes the second encoded video; A processing unit that processes information on the position, size, and application time of the second decoded video, a display screen forming unit that superimposes the second decoded video on the first decoded video, and the processing A decoding device comprising: a control unit that controls the display screen forming unit according to information processed by the unit; and an output unit that outputs an image formed by the display screen forming unit. Usability can be improved even if there is. A disk device connectable to a display device, a reproducing unit for reproducing a video signal from a disk, a first decoding unit for decoding a first encoded video reproduced by the reproducing unit, and a second A second decoding unit for decoding the encoded video, a processing unit for processing information on the position, size, and application time of the second decoded video, and the second decoded video A display screen forming unit that superimposes the decoded video, a control unit that controls the display screen forming unit according to information processed by the processing unit, and an output unit that outputs the video formed by the display screen forming unit Even a disk device characterized by comprising the above can improve usability.

  As described above, it is possible to provide a decoded display device for an encoded video signal that can specify the display position and display size of the sub-video with accuracy of one frame unit and has a flexible designation method.

11 Disc 21, 22 Decoder 31 Auxiliary information analysis unit 41 Reference time counter unit 51, 52 Comparison unit 61 Control unit 71 Display screen formation unit

Claims (4)

  1. An encoded video signal of the main video, an encoded video signal of the sub video, display auxiliary information regarding the display position and display magnification of the sub video, auxiliary information including application time information to which the display auxiliary information is applied, and decoding processing An information reproducing apparatus for reproducing information based on reference time information ,
    A first decoder for decoding an encoded video signal of the main video read from a recording medium based on the reference time information ;
    A second decoder that decodes the encoded video signal of the sub-picture read from the local storage based on the reference time information ;
    An auxiliary information extraction unit that extracts the display auxiliary information and the application time information from the auxiliary information read from the local storage;
    While the main video is being output, and an output unit which outputs the sub-picture based on said reference time information the main image and the applied time information is decoded,
    The first decoder and the second decoder synchronize the main video and the sub video by performing a decoding process based on the reference time information,
    When the reference time information and the application time information matches, the display position and the display magnification of the sub-picture is controlled to be determined based on the display auxiliary information,
    The information reproducing apparatus, wherein the encoded video signal of the sub-video and the auxiliary information are downloaded to the local storage via a network.
  2. An encoded video signal of the main video, an encoded video signal of the sub video, display auxiliary information regarding the display position and display magnification of the sub video, auxiliary information including application time information to which the display auxiliary information is applied, and decoding processing An information reproduction method for reproducing information based on reference time information ,
    A first decoding based on the encoded video signal read out from the recording medium the main image to the reference time information,
    A second decoding based on the encoded video signal of the sub-picture read from the local storage to the reference time information,
    Extracting the display auxiliary information and the application time information from the auxiliary information read from the local storage;
    While the main video is being output, and outputs the sub-picture based on said reference time information the main image and the applied time information is decoded,
    When performing the first decoding and the second decoding, by performing a decoding process based on the reference time information, the main video and the sub-video are synchronized,
    When the reference time information and the application time information matches, the display position and the display magnification of the sub-picture is controlled to be determined based on the display auxiliary information,
    The information reproduction method, wherein the encoded video signal of the sub-video and the auxiliary information are downloaded to the local storage via a network.
  3. An information reproducing apparatus according to claim 1, wherein
    The information reproducing apparatus, wherein the auxiliary information is read from the local storage independently of the encoded video signal of the sub-picture.
  4. An information reproducing method according to claim 2, wherein
    The information reproduction method according to claim 1, wherein the auxiliary information is read from the local storage independently of the encoded video signal of the sub-picture.
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