JP5839195B2 - Recording device, thumbnail management information creation device, recording method and recording program - Google Patents

Description

  The present invention relates to a recording device, a thumbnail management information creation device, a recording method, and a recording program, and more particularly to a recording device, a thumbnail management information creation device, a recording method, and a recording program for recording a stream.

  Japanese Unexamined Patent Application Publication No. 2007-116472 (Patent Document 1) discloses a technique for enabling a user to efficiently jump to a desired scene while checking automatically created thumbnail images. Yes. That is, in conjunction with the recording stop of the remote controller, the thumbnail image creation unit extracts thumbnail still images from the recorded video data at regular intervals to create thumbnail images. Each thumbnail image is stored in the memory unit together with the elapsed time from the recording start time by the timer unit. When the skip key is operated during reproduction, a plurality of thumbnail images are displayed in a list based on the operation time. When one of the displayed thumbnail images is selected, playback is started from the scene of the thumbnail image.

JP 2007-116472 A

  However, in the technique described in Patent Document 1, when a plurality of output format streams are created from one input stream and the created streams are recorded simultaneously, the thumbnails are shared by the plurality of streams. There is a possibility that synchronization between the image and each stream may be lost. If the thumbnail image and each stream cannot be synchronized, for example, even if a thumbnail image is selected, playback cannot be started accurately from the scene of the selected thumbnail image. Also, if thumbnails are created for each output format, the processing becomes complicated and the processing load increases. Further, since the elapsed time from the recording start time is used, it may be difficult to synchronize the streams for each output format. If the streams cannot be synchronized, for example, the streams cannot be seamlessly connected from one scene in one stream to the continuation of the same scene in another stream.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a program corresponding to a thumbnail image with a simple process in a configuration for recording a stream in which program information is divided into a plurality of packets. To provide a recording device, a thumbnail management information creation device, a recording method, and a recording program capable of displaying an image more accurately.

  (1) In order to solve the above problem, a recording apparatus according to an aspect of the present invention is a recording apparatus for recording a stream obtained by dividing information of one or a plurality of programs into a plurality of packets, A thumbnail creation unit for creating a thumbnail image from program images included in the stream; a display timing acquisition unit for obtaining timing information indicating the timing at which the program image corresponding to the thumbnail image should be displayed from the stream; A thumbnail map creation unit for creating and storing a thumbnail map indicating a correspondence relationship between the thumbnail image and the timing information, and displaying the program image corresponding to the specified thumbnail image based on the thumbnail map And a reproduction processing unit for performing the processing.

  In this way, a thumbnail image is created, and by acquiring timing information for designating the timing for displaying the program image corresponding to the created thumbnail image on the display device, the thumbnail image having a clear correspondence with the timing information is obtained. Can be displayed. Further, by using timing information instead of the recording elapsed time counted from the recording start time, the absolute time in the program can be associated with the thumbnail image.

  In addition, since thumbnail images and thumbnail maps are created, when it becomes necessary to specify the absolute time corresponding to a thumbnail image, for example, when performing playback processing, the thumbnail image is referred to by referring to the thumbnail map. The absolute time corresponding to can be specified. Conversely, even when it becomes necessary to specify a thumbnail image corresponding to the absolute time, the thumbnail image corresponding to the absolute time can be specified by referring to the thumbnail map.

  For example, if a thumbnail map is created during recording, it is not necessary to create a thumbnail image and a thumbnail map each time playback processing is performed. At this time, the thumbnail image and the absolute time can be specified by referring to the thumbnail map.

  (2) Preferably, the thumbnail creation unit creates a thumbnail image from a recorded image created by processing a recorded image of a program image included in the stream, and the recording device further includes the timing information and the timing information A recorded image map creating unit for creating and storing a recorded image map indicating a correspondence relationship with the recorded image, wherein the reproduction processing unit is configured to specify the thumbnail specified based on the thumbnail map and the recorded image map; Processing for displaying the recorded image corresponding to the image is performed.

  With such a configuration, it is possible to clarify the correspondence between the recorded image and the timing information indicating the absolute time. Thereby, it is possible to clarify the correspondence between the thumbnail image having a clear correspondence with the timing information and the recorded image. Since the thumbnail image and the recorded image can be strictly associated with each other, the thumbnail image and the recorded image can be synchronized.

  For example, when a recorded image map is created at the time of recording, it is not necessary to create a recorded image map every time it is necessary to specify a recorded image from an absolute time, such as when performing a reproduction process or a special reproduction process. . At this time, the recorded image can be specified from the absolute time by referring to the recorded image map created at the time of recording.

  (3) More preferably, the thumbnail creation unit creates the thumbnail image from a plurality of the recorded images created by different image quality or different methods corresponding to the program images included in the stream, and the recorded image map The creation unit creates and saves a recorded image map indicating a correspondence relationship between the timing information and the plurality of recorded images.

  With such a configuration, it is possible to synchronize between a plurality of recorded images created with different image quality or different methods.

  (4) Preferably, the thumbnail map creation unit creates a thumbnail map indicating a correspondence relationship between the timing information and thumbnail storage position information for specifying a storage position in the storage unit for storing the thumbnail image. And save.

  By creating such a thumbnail map, timing information can be specified from the thumbnail storage position information for specifying the storage position of the thumbnail image in the storage unit with reference to the thumbnail map.

  (5) Preferably, the display timing acquisition unit uses a PTS (Presentation Time Stamp) value in a header of the packet including the program image as timing information indicating the timing at which the program image is to be displayed.

  Thus, by using the PTS value in the header of the packet, it is possible to specify an absolute time indicating the timing for displaying the program image included in the packet on the display device.

  (6) More preferably, the recorded image map creation unit is a recorded image map showing a correspondence relationship between the timing information and storage position information for specifying a storage position in a storage unit for storing the recorded image. Create and save.

  Thus, by referring to the recorded image map, the storage position of the recorded image in the storage unit can be acquired from the timing information.

  (7) More preferably, the recording apparatus further receives a designation of a thumbnail image as a position for starting reproduction of a program, and a start position designation unit for accepting designation of an image quality or a method for performing the reproduction. The timing information corresponding to the designated thumbnail image is extracted based on the thumbnail map, and the timing information corresponding to the extracted timing information of the designated image quality or the method is extracted based on the recorded image map. A map management unit for extracting a recorded image, and the reproduction processing unit starts reproduction from the recorded image extracted by the map management unit.

  With such a configuration, it is possible to start playback from a recorded image created based on a program image corresponding to a specified thumbnail image with a specified image quality or method.

  (8) Preferably, the thumbnail creation unit creates the thumbnail image from an I picture of a program image included in the stream.

  With such a configuration, a recorded image map of an I picture can be created, so that the recorded image map can be used for special reproduction such as fast-forwarding. Further, since the reproduction process can be started only from the I picture, reproduction can be started from the recorded image corresponding to the thumbnail image.

  (9) More preferably, the thumbnail creation unit creates the thumbnail image from the recorded image created by the lowest image quality or a predetermined method among the plurality of recorded images created by different image quality or different methods. .

  With such a configuration, it is possible to reduce the processing load for creating a thumbnail image.

  (10) In order to solve the above problem, a thumbnail management information creating apparatus according to an aspect of the present invention is a recording apparatus for recording a stream in which information of one or a plurality of programs is divided into a plurality of packets. The thumbnail management information creating apparatus used in the above-mentioned, wherein a thumbnail creating unit for creating a thumbnail image from the program image included in the stream, and timing information indicating the timing at which the program image corresponding to the thumbnail image should be displayed Is obtained from the stream, and a thumbnail map creating unit for creating and storing a thumbnail map indicating the correspondence between the thumbnail image and the timing information.

  In this way, a thumbnail image is created, and by acquiring timing information for designating the timing for displaying the program image corresponding to the created thumbnail image on the display device, the thumbnail image having a clear correspondence with the timing information is obtained. Can be displayed. Further, by using timing information instead of the recording elapsed time counted from the recording start time, the absolute time in the program can be associated with the thumbnail image.

  In addition, since thumbnail images and thumbnail maps are created, when it becomes necessary to specify the absolute time corresponding to a thumbnail image, for example, when performing playback processing, the thumbnail image is referred to by referring to the thumbnail map. The absolute time corresponding to can be specified. Conversely, even when it becomes necessary to specify a thumbnail image corresponding to the absolute time, the thumbnail image corresponding to the absolute time can be specified by referring to the thumbnail map.

  For example, if a thumbnail map is created during recording, it is not necessary to create a thumbnail image and a thumbnail map each time playback processing is performed. At this time, the thumbnail image and the absolute time can be specified by referring to the thumbnail map.

  (11) In order to solve the above-described problem, a recording method according to an aspect of the present invention is a recording method in a recording apparatus for recording a stream in which information of one or a plurality of programs is divided into a plurality of packets. A step of creating a thumbnail image from program images included in the stream, a step of obtaining timing information indicating the timing at which the program image corresponding to the thumbnail image is to be displayed from the stream, and the thumbnail image And a step of creating and storing a thumbnail map indicating the correspondence relationship of the timing information, and a step of performing a process of displaying the program image corresponding to the specified thumbnail image based on the thumbnail map.

  In this way, a thumbnail image is created, and by acquiring timing information for designating the timing for displaying the program image corresponding to the created thumbnail image on the display device, the thumbnail image having a clear correspondence with the timing information is obtained. Can be displayed. Further, by using timing information instead of the recording elapsed time counted from the recording start time, the absolute time in the program can be associated with the thumbnail image.

  In addition, since thumbnail images and thumbnail maps are created, when it becomes necessary to specify the absolute time corresponding to a thumbnail image, for example, when performing playback processing, the thumbnail image is referred to by referring to the thumbnail map. The absolute time corresponding to can be specified. Conversely, even when it becomes necessary to specify a thumbnail image corresponding to the absolute time, the thumbnail image corresponding to the absolute time can be specified by referring to the thumbnail map.

  For example, if a thumbnail map is created during recording, it is not necessary to create a thumbnail image and a thumbnail map each time playback processing is performed. At this time, the thumbnail image and the absolute time can be specified by referring to the thumbnail map.

  (12) In order to solve the above problem, a recording program according to an aspect of the present invention is used in a recording apparatus for recording a stream obtained by dividing information of one or more programs into a plurality of packets. A recording program comprising: creating a thumbnail image from a program image included in the stream in a computer; and acquiring timing information indicating the timing for displaying the program image corresponding to the thumbnail image from the stream. And a step of creating and storing a thumbnail map indicating a correspondence relationship between the thumbnail image and the timing information, and a process of displaying the program image corresponding to the specified thumbnail image based on the thumbnail map A program for executing steps It is.

  In this way, a thumbnail image is created, and by acquiring timing information for designating the timing for displaying the program image corresponding to the created thumbnail image on the display device, the thumbnail image having a clear correspondence with the timing information is obtained. Can be displayed. Further, by using timing information instead of the recording elapsed time counted from the recording start time, the absolute time in the program can be associated with the thumbnail image.

  In addition, since thumbnail images and thumbnail maps are created, when it becomes necessary to specify the absolute time corresponding to a thumbnail image, for example, when performing playback processing, the thumbnail image is referred to by referring to the thumbnail map. The absolute time corresponding to can be specified. Conversely, even when it becomes necessary to specify a thumbnail image corresponding to the absolute time, the thumbnail image corresponding to the absolute time can be specified by referring to the thumbnail map.

  For example, if a thumbnail map is created during recording, it is not necessary to create a thumbnail image and a thumbnail map each time playback processing is performed. At this time, the thumbnail image and the absolute time can be specified by referring to the thumbnail map.

  According to the present invention, in a configuration for recording a stream in which program information is divided into a plurality of packets, a recording apparatus and a thumbnail capable of more accurately displaying program images corresponding to thumbnail images with simple processing A management information creation device, a recording method, and a recording program are provided.

It is a figure which shows the structure of the video recording apparatus which concerns on embodiment of this invention. It is a figure which shows the structure of the media chip which concerns on embodiment of this invention. It is a figure which shows an example of the video TS packet in the stream which concerns on embodiment of this invention. It is a figure which shows an example of the PTS map which concerns on embodiment of this invention. It is a figure which shows an example of the thumbnail map which concerns on embodiment of this invention. It is a figure which shows an example of the reproduction position selection screen which concerns on embodiment of this invention. It is a figure which shows an example of the sequence of the operation | movement procedure of the video recording process in the video recording apparatus which concerns on embodiment of this invention. It is a figure which shows an example of the relationship between the thumbnail map and PTS map which concern on embodiment of this invention. It is a figure which shows an example of the sequence of the operation | movement procedure of the reproduction | regeneration processing in the video recording apparatus which concerns on embodiment of this invention. It is a figure which shows an example of the production | generation process of the recorded image performed for every image quality in the image quality conversion process part which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

[Configuration of recording device]
FIG. 1 is a diagram showing a configuration of a recording apparatus according to an embodiment of the present invention.

  Referring to FIG. 1, the recording apparatus 10 includes a receiving unit 12, a PTS value extracting unit (display timing acquiring unit) 13, an image quality conversion processing unit 14, a packet counting unit 15, and an HDD (storage unit) 16. , A PTS map creation unit (recorded image map creation unit) 17, a thumbnail creation unit 18, a thumbnail map creation unit 19, a start position designation unit 20, a playback processing unit 21, a memory 22, and a map management unit 23. Prepare. The HDD 16 may be provided outside the recording device 10.

  For example, in the recording apparatus 10, the functions of the PTS value extraction unit 13, the image quality conversion processing unit 14, the packet counting unit 15, the PTS map creation unit 17, the thumbnail creation unit 18, and the thumbnail map creation unit 19 are realized by a media chip. The

FIG. 2 is a diagram showing the configuration of the media chip according to the embodiment of the present invention.
Referring to FIG. 2, media chip 40 includes PTS value extraction unit (display timing acquisition unit) 43, image quality conversion processing unit 44, packet counting unit 45, and PTS map creation unit (recorded image map creation unit) 47. A thumbnail creation unit 48 and a thumbnail map creation unit 49. Hereinafter, the description of the recording apparatus 10 will be replaced with the description of each block in the media chip 40.

  Referring to FIG. 1 again, the recording apparatus 10 receives and processes a stream obtained by dividing information of one or more programs into a plurality of packets. For example, the recording apparatus 10 receives and processes a stream according to the MPEG2-TS (Moving Picture Experts Group 2 Transport Stream) standard.

  More specifically, the recording device 10 is, for example, an HDD recorder, receives a stream from the station side device, decodes video and audio from the received stream, and reproduces a program on the display device. This station side device is, for example, a device installed in a digital broadcast station.

  The receiving unit 12 is, for example, a tuner, and selectively tunes and amplifies a radio signal in a predetermined frequency band in the radio signal received by the antenna 11, and then extracts a stream by performing analog-digital conversion. . That is, the receiving unit 12 extracts a stream including a predetermined program transmitted from a specific station side device by selecting a predetermined tuning destination. Then, the reception unit 12 outputs the extracted stream to the PTS value extraction unit 13.

  The station side device may be a server compatible with IPTV (Internet Protocol Television) that transmits a stream by a wired system such as FTTH (Fiber To The Home) using an optical fiber as a transmission path. The receiving unit 12 may receive a stream stored in a memory that can be connected from the outside, for example, and output the stream to the PTS value extracting unit 13.

  The stream includes a plurality of TS (Transport Stream) packets, and each TS packet includes a PID (Packet Identification) that is an identifier. The stream includes a TS packet indicating PSI (Program Specific Information) in addition to a video TS packet indicating program video and an audio TS packet indicating program audio. This PSI includes a PAT (Program Association Table) and a PMT (Program Map Table). The PAT includes one or more programs included in the stream, that is, a channel ID that is an identifier of one or more programs that are currently being broadcast, and a PMT PID that includes information on each broadcast channel. The PMT includes PIDs of video TS packets and audio TS packets that include the contents of the corresponding program. PAT and PMT are repeatedly transmitted from the station side device at predetermined intervals.

  That is, the plurality of TS packets in the stream includes a video TS packet and an audio TS packet, which are playback target packets indicating video or audio of the program. The plurality of TS packets in the stream includes a PMT packet that is created corresponding to a program and includes a PID of a reproduction target packet of the corresponding program, and a PAT packet that includes a PID of one or more PMT packets.

  Next, video TS packets and audio TS packets in the stream will be described.

  FIG. 3 is a diagram showing an example of a video TS packet in the stream according to the embodiment of the present invention.

  Referring to FIG. 3, a stream includes a plurality of PES (Packetized Elementary Streams). As for the video of the program, there are PES of I picture (Intra-Picture), P picture (Predictive-Picture) and B picture (By-directionally Predictive-Picture).

  PES is a packetized ES (Elementary Stream) indicating video data or audio data in MPEG2. The video TS packet is a packet obtained by dividing a PES including video data of a program every 188 bytes. Similarly, the audio TS packet is a packet obtained by dividing a PES including audio data of a program every 188 bytes.

  The I picture, P picture, and B picture are images drawn in each frame for displaying a moving image. Since an I picture has no dependency relationship with previous and subsequent frames, an image is created by decoding an I picture alone. On the other hand, since the P picture and the B picture are dependent on the preceding and succeeding frames, an image is not created even if these are decoded alone. Since the I picture does not require the preceding and following frames when creating the image, it is used for an image for special reproduction such as fast-forwarding or a preview, for example.

  A PES including program image data or program audio data includes a PTS (Presentation Time Stamp) value, which is timing information indicating the timing of image display or audio output, in the header of the PES or TS packet. . In addition, the clock of the station apparatus that is the stream transmission side and the clock of the recording apparatus 10 that is the stream reception side do not necessarily match. The stream in MPEG2-TS includes a PCR (Program Clock Reference) for synchronizing the station side apparatus and the recording apparatus 10 every 30 milliseconds, for example. The recording device 10 synchronizes its own clock with the clock of the station side device using the PCR read from the stream.

  Referring again to FIG. 1, the PTS value extraction unit 13 extracts the PID of the PMT related to a predetermined program from the PAT in the stream extracted by the reception unit 12. Next, the PTS value extraction unit 13 specifies the PMT by the extracted PID, and analyzes the specified PMT, thereby acquiring the PID of the video TS packet including the video data of the predetermined program. Next, the PTS value extraction unit 13 specifies a PES including program image data of a predetermined program based on the acquired PID of the video TS packet. Next, if the program image data included in the specified PES is, for example, an I picture, the PTS value extraction unit 13 extracts a PTS value from the header of the PES or TS packet. Next, the PTS value extraction unit 13 outputs the extracted PTS value to the PTS map creation unit 17 and the thumbnail map creation unit 19. The PTS value extraction unit 13 outputs, for example, the PID of the acquired video TS packet to the image quality conversion processing unit 14 together with a stream including information on a predetermined program.

  The image quality processing conversion unit 14 receives a stream including information on a predetermined program from the PTS value extraction unit 13. Also, the image quality conversion processing unit 14 receives, for example, the PTS of the video TS packet from the PTS value extraction unit 13. The image quality conversion processing unit 14 specifies a PES based on the PID of the video TS packet, and extracts a program image of a predetermined program from the specified PES. Next, the image quality conversion processing unit 14 performs recorded image processing on the extracted program image.

  Specifically, the image quality conversion processing unit 14 creates a recorded image having the same resolution as the extracted program image. At this time, the image quality conversion processing unit 14 creates a recorded image corresponding to “Fine” having the same image quality as the original program image. The image quality conversion processing unit 14 converts the image quality of the program image and creates a recorded image with a reduced resolution, for example. At this time, the image quality conversion processing unit 14 creates a recorded image corresponding to “Medium” of the normal image quality and “Coarse” for the mobile phone having the roughest image quality.

  Further, when creating a recorded image from the program image, the image quality conversion processing unit 14 may create the recorded image by a method different from the encoding method of the program image data used in the program image. Specifically, the recorded image may be created by a method such as MPEG-4 (Moving Picture Experts Group 4) or ASF (Advanced Systems Format).

  The image quality processing conversion unit 14 creates a recording stream for each image quality based on the created recorded image. The image quality conversion processing unit 14 may change the video format when creating a recording stream. The image quality processing conversion unit 14 outputs a recording stream of Fine, Medium, and Coarse image quality to the packet counting unit. At this time, the image quality conversion processing unit 14 may output, for example, the PID of the video TS packet including the I picture to the packet counting unit.

  The image quality processing conversion unit 14 outputs, for example, a recorded image converted to a coarse image quality to the thumbnail creating unit 18 when a predetermined program image is recorded. The predetermined program image is, for example, an I picture every 15 seconds.

  The thumbnail creation unit 18 creates a thumbnail image with lower image quality from the recorded image received from the image quality processing conversion unit 14. The thumbnail is, for example, an image obtained by reducing the image quality of an I picture every 15 seconds, and is used when a list is displayed on a reproduction position selection screen described later. Next, the thumbnail creation unit 18 outputs the created thumbnail to the thumbnail map creation unit 19.

  When receiving the recording stream from the image quality conversion processing unit 14, the packet counting unit 15 counts the information amount of the recording stream for each image quality and records the information on the HDD 16. Specifically, the packet counting unit 15 counts the number of bytes of the packet of the recording stream received from the image quality conversion processing unit 14 for each image quality, and then records the packet on the HDD 16. The packet counting unit 15 integrates the counted number of bytes to obtain a packet offset value for each image quality, which is the total number of bytes of the recorded stream packets recorded on the HDD 16 so far.

  The packet counting unit 15 receives the PID of the video TS packet including the I picture from the image quality conversion processing unit 14 every 0.5 seconds, for example. When the packet counting unit 15 recognizes that the PES of the stream including the image of the I picture has been received based on the PID, the packet counting unit 15 calculates the packet offset value for each image quality before counting the number of bytes of the received PES. 17 output. The packet counting unit 15 may perform the output process every 0.5 seconds, for example. By referring to the packet offset value, the position of the PES including the I picture in the recording stream can be specified.

  When the recording device 10 records a stream, the PTS map creation unit 17 creates a recorded image map indicating the correspondence between the PTS value and the recorded image. Specifically, the PTS map creating unit 17 creates a PTS map indicating the correspondence between the PTS value received from the PTS value extracting unit 13 and the packet offset value received from the packet counting unit 15. Further, the PTS map creation unit 17 expands the PTS map on the memory 22 as necessary, and stores it in the HDD 16.

FIG. 4 is a diagram showing an example of the PTS map according to the embodiment of the present invention.
Referring to FIG. 4, the packet offset value for each image quality is stored in association with the PTS value. Since the screen display time can be calculated based on the PTS value, it may be omitted. The I picture name is identification information for specifying the I picture.

  The thumbnail map creation unit 19 receives a thumbnail image from the thumbnail creation unit 18 when the recording device 10 records a stream. The thumbnail map creation unit 19 stores the received thumbnail image in the HDD 16. At this time, the thumbnail map creation unit 19 creates a thumbnail map by associating the file path, which is the storage destination information of the thumbnail image, with the PTS value received from the PTS value extraction unit 13.

FIG. 5 is a diagram showing an example of a thumbnail map according to the embodiment of the present invention.
Referring to FIG. 5, the file path is stored in association with the PTS value. The file path is the file name of the thumbnail image file represented by a full path. Further, the screen display time can be omitted because it can be calculated based on the PTS value, or may be used when a playback position selection screen described later is displayed. In addition, the aspect ratio extracted when creating the thumbnail may be added to the thumbnail map. Further, the thumbnail map creation unit 17 develops the thumbnail map on the memory 22 as necessary, and stores it in the HDD 16.

  The HDD 16 is a storage device such as a hard disk drive and records the recording stream received from the packet counting unit 15. Further, when the recording stream is requested after the packet offset value is specified from the reproduction processing unit 21, the HDD 16 outputs the recording stream from the position specified by the packet offset value to the reproduction processing unit 21.

  The HDD 16 stores thumbnail images received from the thumbnail map creation unit 19 via the memory 22. The HDD 16 outputs a thumbnail image to the reproduction processing unit 21 in response to a request from the reproduction processing unit 21.

  The HDD 16 stores the thumbnail map received from the thumbnail map creation unit 19 via the memory 22. The HDD 16 outputs a thumbnail map to the map management unit 23 via the memory 22 in response to a request from the map management unit 23.

  Further, the HDD 16 stores the PTS map received from the PTS map creation unit via the memory 22. The HDD 16 outputs a PTS map to the map management unit 23 via the memory 22 in response to a request from the map management unit 23.

  The memory 22 is a memory such as a DRAM (Dynamic Random Access Memory), for example, and stores various types of information exchanged between the units in the recording apparatus 10. The memory 22 expands data output from the HDD 16 as necessary, and stores the expanded data in the HDD 16 as necessary.

  When the start position designating unit 20 receives a display requesting operation for the playback position selection screen by the user, the start position designating unit 20 causes the map management unit 23 to specify a thumbnail image necessary for displaying the playback position selection screen on the display device. In addition, the start position designation unit 20 accepts the selection of a thumbnail image by the user on the playback position selection screen, and notifies the map management unit 23 of the selected thumbnail image.

FIG. 6 is a diagram showing an example of a playback position selection screen according to the embodiment of the present invention.
Referring to FIG. 6, a thumbnail image created from a program image of a predetermined program included in the stream is displayed on the playback position selection screen. At this time, the screen display time corresponding to each thumbnail image may be displayed on the playback position selection screen. The user can designate the position where the program starts to be reproduced by selecting a thumbnail image on the reproduction position selection screen.

  The map management unit 23 refers to a thumbnail map created when a predetermined program is recorded on the HDD 16 in response to a display request for the playback position selection screen by the start position specifying unit 20 and displays the playback position selection screen. Identify the thumbnail images required for Then, the map management unit 23 notifies the reproduction processing unit 21 of the identified thumbnail image. Further, the map management unit 23 specifies a packet offset value of a predetermined image quality corresponding to the thumbnail image from the thumbnail map and the PTS map based on the thumbnail image notified from the start position specifying unit 20. Then, the map management unit 23 notifies the reproduction processing unit 21 of the specified packet offset value of the predetermined image quality.

  The reproduction processing unit 21 displays or reproduces the program image or the recorded image on the display device. Specifically, upon receiving notification about the thumbnail image from the map management unit 23, the reproduction processing unit 21 reads the thumbnail image from the HDD 16 and displays a reproduction position selection screen on the display device. In addition, when the playback processing unit 21 receives a packet offset value of a predetermined image quality from the map management unit 23, the playback processing unit 21 reads and reads the stream from the storage position specified by the packet offset value in the recording stream of the predetermined image quality in the HDD 16. The stream is decoded and reproduced on the display device.

[Recording operation of recording device]
Next, an operation performed when the recording apparatus 10 records a program included in the received stream for each image quality will be described in detail. In the following, the operation description of the recording device 10 is replaced with the operation description of the media chip 40.

  The recording apparatus 10 reads out and executes each step of each flowchart shown below from a memory (not shown). This program can be installed externally. The installed program is distributed in a state stored in a recording medium, for example.

  FIG. 7 is a diagram showing an example of a sequence of an operation procedure of recording processing in the recording apparatus according to the embodiment of the present invention.

  With reference to FIG. 7, first, the receiving unit 12 receives a stream including the program in order to record a predetermined program designated by the user (step S <b> 102).

  Next, the receiving unit 12 outputs the received stream to the PTS value extracting unit 13 (step S104).

  Next, for example, the PTS value extraction unit 13 identifies a PES including an I picture from the received stream, and extracts a PTS value associated with the I picture from the packet header of the identified PES (step S106).

  In addition, when receiving the stream from the receiving unit 12 for the first time, the PTS value extracting unit 13 may perform an initialization operation. The initialization operation includes, for example, a reset operation for setting a packet offset value for each image quality to 0, a new PTS map, a new thumbnail map, and a file for saving a recording stream in the HDD 16. The file name for storing the PTS map, the thumbnail map, and the recording stream may be specified from the name of a predetermined program included in the received stream, for example.

  Next, the PTS value extraction unit 13 outputs the extracted PTS value to the thumbnail map creation unit 19 (step S108).

  Next, upon receiving the PTS value from the PTS value extracting unit 13, the thumbnail map creating unit 19 stores the received PTS value in the thumbnail map shown in FIG. 5 (step S112).

  Further, the PTS value extracting unit 13 outputs the extracted PTS value to the PTS map creating unit 17 (step S110).

  Next, when receiving the PTS value from the PTS value extracting unit 13, the PTS map creating unit 17 stores the received PTS value in the PTS map shown in FIG. 4 (step S114).

  Further, the PTS value extraction unit 13 outputs, for example, the PID of the video TS packet to the image quality conversion processing unit 14 together with the stream received from the reception unit 12 (step S116).

  Next, when receiving the stream from the PTS value extraction unit 13, the image quality conversion processing unit 14 creates a recording stream (Fine) having the same image quality as the received stream, for example (step S118).

  More specifically, for example, when the PID of the video TS packet is received from the PTS value extraction unit 13, the image quality conversion processing unit 14 identifies a PES based on the PID and extracts a program image of a predetermined program from the identified PES. To do. Next, the image quality conversion processing unit 14 creates a recorded image having the same image quality as the extracted program image. The image quality conversion processing unit 14 creates a PES based on the created recorded image, and creates a recorded stream (Fine) including the rewritten PAT and PMT as necessary. At this time, the image quality conversion processing unit 14 may change the video format. Further, the image quality conversion processing unit 14 may output the PID of the video TS packet of the recording stream (Fine) including, for example, an I picture to the packet counting unit 15.

  Next, the image quality conversion processing unit 14 outputs the created recording stream (Fine) to the packet counting unit 15 (step S120).

  Next, the packet counting unit 15 receives the recording stream (Fine) from the image quality conversion processing unit 14. At this time, the packet counting unit 15 may receive the PID of the video TS packet including the I picture in the recording stream (Fine) from the image quality conversion processing unit 14, for example. When receiving the video TS packet including the I picture specified from the PID, the packet counting unit 15 outputs a packet offset value (Fine) to the PTS map creating unit 17 (step S122).

  Next, when receiving the packet offset value (Fine) from the packet counting unit 15, the PTS map creating unit 17 receives the packet offset value (FTS) received from the PTS value extracting unit 13 and the packet offset value (Fine) received from the packet counting unit 15 in step S110. Fine) is stored in the PTS map in association with each other (step S124).

  Further, the packet counting unit 15 counts the number of bytes of the packet of the recording stream (Fine) received from the image quality conversion processing unit 14. Next, the packet counting unit 15 adds the counted number of bytes to the packet offset value (Fine) (step S126).

  Next, the packet counting unit 15 outputs the recording stream (Fine) received from the image quality conversion processing unit 14 to the HDD 16 (Step S128), and records it on the HDD 16 (Step S130).

  Further, when receiving the stream from the PTS value extracting unit 13, the image quality conversion processing unit 14 creates a recording stream (Medium) of normal image quality, for example (step S132).

  More specifically, the image quality conversion processing unit 14 creates a recorded image obtained by converting the program image of the predetermined program extracted in step S118 to a normal image quality, for example. The image quality conversion processing unit 14 creates a PES based on the created recorded image, and creates a recording stream (Medium) including the rewritten PAT and PMT as necessary. At this time, the image quality conversion processing unit 14 may change the video format. Further, the image quality conversion processing unit 14 may output the PID of the video TS packet of the recording stream (Medium) including the I picture to the packet counting unit 15, for example.

  Next, the image quality conversion processing unit 14 outputs the created recording stream (Medium) to the packet counting unit 15 (step S134).

  Next, the packet counting unit 15 receives a recording stream (Medium) from the image quality conversion processing unit 14. At this time, the packet counting unit 15 may receive, for example, the PID of the video TS packet including the I picture in the recording stream (Medium) from the image quality conversion processing unit 14. When receiving the video TS packet including the I picture specified from the PID, the packet counting unit 15 outputs the packet offset value (Medium) to the PTS map creating unit 17 (step S136).

  Next, when receiving the packet offset value (Medium) from the packet counting unit 15, the PTS map creating unit 17 receives the PTS value received from the PTS value extracting unit 13 in step S110 and the packet offset value ( (Medium) is stored in the PTS map in association with each other (step S138).

  Further, the packet counting unit 15 counts the number of bytes of the packet of the recording stream (Medium) received from the image quality conversion processing unit 14. Next, the packet counting unit 15 adds the counted number of bytes to the packet offset value (Medium) (step S140).

  Next, the packet counting unit 15 outputs the recording stream (Medium) received from the image quality conversion processing unit 14 to the HDD 16 (Step S142), and records it on the HDD 16 (Step S144).

  Further, when receiving the stream from the PTS value extraction unit 13, the image quality conversion processing unit 14 creates, for example, a video recording stream (Coarse) for the mobile phone having the roughest image quality (Step S146).

  More specifically, the image quality conversion processing unit 14 creates a recorded image obtained by converting the program image of the predetermined program extracted in step S118 to the coarsest image quality, for example. The image quality conversion processing unit 14 creates a PES based on the created recorded image, and creates a recorded stream (Coarse) to which the rewritten PAT and PMT are added as necessary. At this time, the image quality conversion processing unit 14 may change the video format. Further, the image quality conversion processing unit 14 may output the PID of the video TS packet of the recording stream (Coarse) including the I picture to the packet counting unit 15, for example.

  Next, the image quality conversion processing unit 14 outputs the created recording stream (Coarse) to the packet counting unit 15 (step S148).

  Next, the packet counting unit 15 receives the recording stream (Coarse) from the image quality conversion processing unit 14. At this time, the packet counting unit 15 may receive the PID of the video TS packet including the I picture in the recording stream (Coarse) from the image quality conversion processing unit 14, for example. When receiving the video TS packet including the I picture specified from the PID, the packet counting unit 15 outputs a packet offset value (Coarse) to the PTS map creating unit 17 (step S150).

  Next, when receiving the packet offset value (Coarse) from the packet counting unit 15, the PTS map creating unit 17 receives the PTS value received from the PTS value extracting unit 13 and the packet offset value received from the packet counting unit 15 (step S 110). (Coarse) is associated and stored in the PTS map (step S152).

  Further, the packet counting unit 15 counts the number of bytes of the packet of the recording stream (Coarse) received from the image quality conversion processing unit 14. Next, the packet counting unit 15 adds the counted number of bytes to the packet offset value (Coarse) (step S154).

  Next, the packet counting unit 15 outputs the recording stream (Coarse) received from the image quality conversion processing unit 14 to the HDD 16 (step S156), and records it on the HDD 16 (step S158).

  For example, when creating the coarsest recorded image from the program image in step S146, the image quality conversion processing unit 14 outputs the created recorded image (Coarse) to the thumbnail creating unit 18 (step S160).

  Next, when receiving the recorded image (Coarse) from the image quality conversion processing unit 14, the thumbnail creating unit 18 creates a thumbnail image from the recorded image (Coarse) (step S162).

  Next, the thumbnail creation unit 18 outputs the image data of the created thumbnail image to the thumbnail map creation unit 19 (step S164).

  Next, when the thumbnail map creation unit 19 receives the image data of the thumbnail image from the thumbnail creation unit 18, the thumbnail map creation unit 19 outputs the received thumbnail image image data to the HDD 16 (step S166) and stores it in the HDD 16 (step S170).

  Next, the thumbnail map creation unit 19 stores the file path indicating the storage destination of the thumbnail image stored in the HDD 16 in the thumbnail map in association with the PTS value received from the PTS value extraction unit 13 in step S108 (step S172). ).

  With the above operation, a recording process for recording a program included in the received stream onto the HDD 16 for each image quality is performed while creating a PTS map and a thumbnail map.

  Note that the image quality conversion processing unit 14 may create a recorded image by a method different from the data encoding method used in the program image in steps S118, S132, and S146 in the above operation.

  Since an I picture is included every 0.5 seconds in a stream including a program, for example, in steps S124, S138 and S152 in the above operation, a PTS value and a packet offset value are recorded in the PTS map every 0.5 seconds. The The PTS map updated every 0.5 seconds can be used to specify the storage position in the HDD 16 of the recorded image corresponding to the PTS value when performing special playback such as fast-forwarding.

  In addition, the image quality conversion processing unit 14 does not always need to output the recorded image with the coarsest image quality created from the I picture to the thumbnail creating unit 18 in step S162. For example, when the thumbnail image is used to specify the reproduction start position, the image quality conversion processing unit 14 may output the recorded image to the thumbnail creating unit 18 every 15 seconds. As a result, thumbnail images are created every 15 seconds, so that the burden of thumbnail creation processing can be reduced.

  In step S106, the PTS value is extracted from the program image in the stream received by the receiving unit 12. The PTS value indicates a timing at which a program image corresponding to a packet including the PTS value is displayed on the display device. Therefore, the PTS value indicates the absolute time in the program. That is, the recording device 10 can associate absolute time with the thumbnail image and the packet offset value created when recording the stream.

  Further, when a thumbnail image is designated, the PTS value corresponding to the thumbnail image can be specified in the thumbnail map. In the PTS map, the packet offset value can be specified from the PTS value. The packet offset value indicates the storage position of the recorded image in the recording stream recorded on the HDD 16. That is, by specifying a thumbnail image, a recorded image corresponding to the thumbnail image can be specified. Therefore, it is possible to synchronize the thumbnail image and the recorded image.

  Further, when the recording apparatus 10 creates a recording stream of a plurality of image quality from, for example, three types of recorded images of Fine, Medium, and Course, the thumbnail image and the recorded image can be synchronized by the PTS value. It is not necessary to create an image. Thereby, the recording apparatus 10 can simplify the process of creating the thumbnail image and reduce the load.

  In step S162, a thumbnail image is created from the coarse recorded image having the coarsest image quality. Therefore, a thumbnail image is created as compared with a case where a thumbnail image is created from a fine or medium recorded image with higher image quality. Processing load can be reduced. Further, instead of the coarse recorded image, for example, a thumbnail image may be created from a recorded image created by MPEG-4 which is a mobile system. This also reduces the processing load for creating thumbnail images.

  In the above operation, three types of recording streams of Fine, Medium, and Course are created from the stream received by the receiving unit 12, but only one type of recording stream may be created. Even in this case, by using the PTS value, it is possible to strictly associate the thumbnail image and the recorded image in the recording stream.

  Further, in the above operation, the recording apparatus 10 creates a recording stream including recorded images with different image quality, but may create a recording stream including recorded images with different methods. Also in this case, the thumbnail map and the PTS map are created as in the case of creating the recording stream including the recorded images having different image quality, so that the thumbnail image and the recorded image can be synchronized.

[Relationship between thumbnail map and PTS map]
Next, the relationship between the thumbnail map and the PTS map will be described in detail.

  FIG. 8 is a diagram showing an example of the relationship between the thumbnail map and the PTS map according to the embodiment of the present invention.

  Referring to FIG. 8, first, FIG. 8A schematically shows a thumbnail image that can be specified by the PTS value, the screen display time, the file name in the file path, and the file path included in the thumbnail map shown in FIG. It is shown.

  A thumbnail image can be specified by a file path. The screen display time can be calculated based on the PTS value. That is, the thumbnail image and the screen display time can be associated with each other.

  FIG. 8B schematically shows the relationship between the recording stream (Fine), the recording stream (Medium), the recording stream (Coarse), and the packet offset value shown in FIG. The horizontal axis indicates the packet offset value in each recording stream. The capacity of the recording stream (Fine) having the best image quality is the largest, and the capacity decreases in the order of the recording stream (Medium) and the recording stream (Coarse).

  Referring to FIG. 5, for example, thumbnail images displayed as “S” shown in FIG. 8A are associated with PTS values of 5,406,146. Then, referring to FIG. 4, in the PTS map, the packet offset value associated with the PTS value “5,406,146” is specified. Thus, the packet offset value is 134,463 bytes in the recording stream (Fine), 33,514 bytes in the recording stream (Medium), and 17,042 bytes in the recording stream (Coarse) for each image quality.

  Then, by reading the data from the packet offset value specified in each recording stream, it is possible to acquire the data of the recorded image created from the program image that is the basis of the thumbnail image.

  In addition, the correspondence between the PTS value and the packet offset value of the recording stream (Fine), the recording stream (Medium), and the recording stream (Coarse) is clarified by the PTS map. Can be synchronized.

[Recording device playback operation]
Next, the operation in which the recording device 10 performs the reproduction process of the recorded stream from the recorded image created from the program image that is the basis of the designated thumbnail image will be described in detail.

  FIG. 9 is a diagram showing an example of a sequence of an operation procedure of reproduction processing in the recording apparatus according to the embodiment of the present invention.

  Referring to FIG. 9, first, the program and image quality to be reproduced are designated by the user. Next, the user performs an operation on the start position designating unit 20 for causing the display device to display a playback position selection screen for selecting a position at which to start playback of the program (step S202). For example, it is assumed that the user designates a predetermined program with Fine image quality.

  Next, when receiving a display request operation for a playback position selection screen by the user, the start position specifying unit 20 outputs a playback position selection screen display command including a program name of a predetermined program to the map management unit 23 (step S204) ).

  Next, when receiving a reproduction position selection screen display command from the start position specifying unit 20, the map management unit 23 acquires a program name of a predetermined program, for example. Next, the map management unit 23 specifies a thumbnail map created when a recording stream including a predetermined program is recorded on the HDD 16 based on the program name, and reads out and refers to the thumbnail map (step S206).

  Next, the map management unit 23 specifies a file path for specifying the storage position of the thumbnail image in the HDD 16 with the screen display time from 0s00 to 1m15s00, for example, in the thumbnail map shown in FIG.

  Next, the map management unit 23 notifies the reproduction processing unit 21 of the identified file path (step S210).

  Next, when the reproduction processing unit 21 receives a file path from the map management unit 23, the reproduction processing unit 21 reads out a thumbnail image corresponding to the received file path from the HDD 16 (step S211).

  Next, the reproduction processing unit 21 displays the reproduction position selection screen shown in FIG. 6 including the thumbnail image read from the HDD 16 on the display device (step S212).

  Next, for example, when the start position designation unit 20 receives a selection of a thumbnail image displayed as “S” by the user and having a screen display time “1 minute 00 second” (step S214), the start position designation unit 20 selects the selected thumbnail image. A selection thumbnail notification including information for specifying, program name and image quality of a predetermined program is output to the map management unit 23 (step S216). The information for specifying the selected thumbnail image is, for example, “c: ¥ stb ¥ 20111120 ¥ TN-4.tmb” which is the file path of the thumbnail image. The image quality is “Fine”, for example.

  Next, upon receiving the selected thumbnail notification from the start position specifying unit 20, the map management unit 23 acquires, for example, a file path of a thumbnail image. Next, the map management unit 23 identifies a thumbnail map created when a recording stream including a predetermined program is recorded on the HDD 16 based on the program name, reads out from the HDD 16 and refers to it (step S218).

  Next, the map management unit 23 specifies “5,406,146” which is a PTS value corresponding to “c: ¥ stb ¥ 20111120 ¥ TN-4.tmb” in the thumbnail map shown in FIG. S220).

  Next, the map management unit 23 specifies and refers to the PTS map created when the recording stream including the predetermined program is recorded on the HDD 16 based on the program name (step S222).

  Next, the map management unit 23 identifies “134,463”, which is the packet offset value of the image quality “Fine”, corresponding to the PTS value “5,406,146” (step S224).

  Next, the map management unit 23 notifies the reproduction processing unit 21 of “134,463” that is the specified packet offset value (step S226). At this time, the map management unit 23 may notify the reproduction processing unit 21 of a packet offset notification including the program name of a predetermined program, for example.

  Next, the reproduction processing unit 21 receives a packet offset value from the map management unit 23. At this time, the reproduction processing unit 21 receives a program name of a predetermined program from the map management unit 23, for example. Next, the playback processing unit 21 specifies the file name of the recorded stream having the image quality “Fine” from the program name, and sends a stream request including the specified file name and the packet offset value that can specify the storage location to the HDD 16. Output (step S228).

  Next, when receiving a stream request from the reproduction processing unit 21, the HDD 16 acquires a file name and a packet offset value, and specifies a read position in the HDD 16 (step S230).

  Next, the HDD 16 reads the recording stream (Fine) from the specified reading position, and outputs the read recording stream (Fine) to the reproduction processing unit 21 (step S232).

  Next, the reproduction processing unit 21 reproduces the recording stream (Fine) received from the HDD 16 on the display device (step S234). At this time, the playback processing unit 21 can start playback from the screen on which “S” is displayed.

  With the above operation, a reproduction operation for reproducing the stream recorded by the recording device 10 is performed with reference to the PTS map and the thumbnail map.

  By the way, in the operation procedure shown in FIG. 7, the image quality conversion processing unit 14 performs recorded image processing by, for example, sequential operation when program image processing is performed on the program image included in the PES of the stream. Therefore, the recording image processing time for the recorded images created from the same program image, for example, the recorded images included in the recorded stream (Fine), the recorded stream (Medium), and the recorded stream (Coarse), is different. In the following, the difference in time during which recorded images created from the same program image are processed will be described.

  FIG. 10 is a diagram showing an example of a recorded image creation process performed for each image quality in the image quality conversion processing unit according to the embodiment of the present invention.

  Referring to FIG. 10, the horizontal axis indicates the elapsed recording time, that is, the time counted from the time when the recording apparatus 10 starts recording a predetermined program included in the stream.

  The image quality conversion processing unit 14 performs, for example, the image quality of an I picture (IPicture-119) that is a program image received from the PTS value extraction unit 13 when performing recorded image processing in steps S118, S132, and S146 shown in FIG. Suppose you want to convert

  In step S118 shown in FIG. 7, the time when the image quality conversion processing unit 14 starts the recorded image processing from the program image to the image quality of Fine is set to t1. The time when the image quality conversion processing unit 14 finishes creating the recorded image (Fine) is set to t2. At this time, since the program image and the recorded image (Fine) have the same image quality, the processing time is short.

  In step S132 shown in FIG. 7, the time when the image quality conversion processing unit 14 starts the recorded image processing from the program image to the medium image quality is set to t2. Then, the time when the image quality conversion processing unit 14 finishes creating the recorded image (Medium) is t3.

  Also, in step S146 shown in FIG. 7, the time when the image quality conversion processing unit 14 starts the recorded image processing from the program image to the coarse image quality is set to t3. The time when the image quality conversion processing unit 14 finishes creating the recorded image (Coarse) is set to t4.

  When the image quality conversion processing unit 14 performs the recorded image processing for creating a plurality of recorded images of the same image quality from the same program image, if the recorded image processing is performed in a sequential manner, the elapsed recording time for which the recorded image processing is performed is performed. Different for each image quality. For example, the elapsed recording time associated with the recorded image (Fine) in the recorded stream (Fine) is t2. Also, the elapsed recording time associated with the recorded image (Medium) in the recorded stream (Medium) is assumed to be t3. Also, the elapsed recording time associated with the recorded image (Coarse) in the recorded stream (Coarse) is assumed to be t4.

  In addition, in step S162 illustrated in FIG. 7, the time when the thumbnail creating unit 18 starts creating a thumbnail image from the recorded image (Coarse) is set to t4. Then, the time when the thumbnail creating unit 18 finishes creating the thumbnail image is set to t5. For example, the elapsed recording time associated with the thumbnail image is t5.

  For example, when it is desired to start playback from the thumbnail image, if the playback start position is specified based on the recording elapsed time t5 corresponding to the thumbnail image, the following problem occurs. That is, since t2, t3, t4, and t5 are generally different times, there is no recorded image having a recording elapsed time that exactly matches the recording elapsed time t5 corresponding to the thumbnail. Therefore, in the above case, there is a possibility that the reproduction is started from a recorded image created at a time after t5. That is, there is a problem that synchronization cannot be established between the thumbnail images and the recorded images in the recording stream. Since t2, t3 and t4 are generally different times, it is difficult to synchronize the recorded streams.

  In order to synchronize between the thumbnail image and the recorded image in the recorded stream, if a thumbnail is created for each recorded stream, the thumbnail image creating process in step S162 shown in FIG. 7 needs to be performed for the image quality of Fine and Medium. And the processing load increases.

  Even when trying to solve the above problem by performing the recorded image processing and the thumbnail image creation processing in parallel, it is difficult to strictly synchronize between the recorded images in the thumbnail image and the recorded stream, or the recorded images in the plurality of recorded streams. .

  Further, in the recorded image processing shown in FIGS. 7 and 10, the program image is subjected to image conversion processing for each one to create a recorded image. For example, a GOP (Group of Picture) including a series of about 15 program images is used. ) Recorded image processing may be performed in units. At this time, it becomes more difficult to synchronize the thumbnail image and the recorded image.

  On the other hand, in the recording device according to the embodiment of the present invention, the thumbnail creation unit 18 creates a thumbnail image from the program image included in the stream. The PTS value extraction unit 13 acquires a PTS value indicating the timing at which the program image corresponding to the thumbnail image should be displayed from the stream. The thumbnail map creation unit 19 creates and stores a thumbnail map indicating the correspondence between the thumbnail image and the PTS value. Then, the reproduction processing unit 21 performs processing for displaying a program image corresponding to the designated thumbnail image based on the thumbnail map.

  In this way, a thumbnail image is created, and a thumbnail image with a clear correspondence with the PTS value is obtained by acquiring the PTS value for designating the timing for displaying the program image corresponding to the created thumbnail image on the display device. Can be displayed. Further, the absolute time can be associated with the thumbnail image by using the PTS value instead of the recording elapsed time counted from the recording start time.

  In addition, since thumbnail images and thumbnail maps are created, when it becomes necessary to specify the absolute time corresponding to a thumbnail image, for example, when performing playback processing, the thumbnail image is referred to by referring to the thumbnail map. The absolute time corresponding to can be specified. Conversely, even when it becomes necessary to specify a thumbnail image corresponding to the absolute time, the thumbnail image corresponding to the absolute time can be specified by referring to the thumbnail map.

  For example, if a thumbnail map is created during recording, it is not necessary to create a thumbnail image and a thumbnail map each time playback processing is performed. At this time, the thumbnail image and the absolute time can be specified by referring to the thumbnail map.

  Further, in the recording apparatus according to the embodiment of the present invention, the thumbnail creating unit 18 creates a thumbnail image from the recorded image created by performing the recorded image processing on the program image included in the stream. The PTS map creation unit 17 creates and stores a PTS map indicating the correspondence between the PTS value and the recorded image. Then, the playback processing unit 21 performs processing for displaying a recorded image corresponding to the designated thumbnail image based on the thumbnail map and the PTS map.

  With such a configuration, the correspondence between the recorded image and the PTS value indicating the absolute time can be clarified. Thereby, it is possible to clarify the correspondence between the thumbnail image having a clear correspondence with the PTS value and the recorded image. Since the thumbnail image and the recorded image can be strictly associated with each other, the thumbnail image and the recorded image can be synchronized.

  For example, when a PTS map is created during recording, the PTS map does not have to be created every time a recorded image needs to be specified from the absolute time, such as when performing a reproduction process or a special reproduction process. At this time, the recorded image can be identified from the absolute time by referring to the PTS map created at the time of recording.

  Further, in the recording apparatus according to the embodiment of the present invention, the thumbnail creating unit 18 creates a thumbnail image from a plurality of recorded images created with different image quality or different methods corresponding to program images included in the stream. Then, the PTS map creation unit 17 creates and stores a recorded image map that indicates the correspondence between the timing information and the plurality of recorded images.

  With such a configuration, it is possible to synchronize between a plurality of recorded images created with different image quality or different methods.

  In the recording device according to the embodiment of the present invention, the thumbnail map creating unit 19 creates a thumbnail map indicating the correspondence between the PTS value and the file path for specifying the storage position of the thumbnail image in the HDD 16. And save.

  By creating such a thumbnail map, the PTS value can be identified from the file path that is the storage destination of the thumbnail image in the HDD 16 with reference to the thumbnail map.

  In the recording apparatus according to the embodiment of the present invention, the PTS value extraction unit 13 uses a PTS (Presentation Time Stamp) value in the header of a packet including the program image as timing information indicating the timing at which the program image should be displayed. Use.

  Thus, by using the PTS value in the header of the packet, it is possible to specify an absolute time indicating the timing for displaying the program image included in the packet on the display device.

  In the recording apparatus according to the embodiment of the present invention, the PTS map creating unit 17 indicates the correspondence between the PTS value and the packet offset value for specifying the storage position in the HDD 16 for storing the recorded image. Create and save a PTS map.

  In this way, by referring to the PTS map, the storage position of the recorded image in the HDD 16 can be acquired from the PTS value.

  In the recording apparatus according to the embodiment of the present invention, the start position designating unit 20 accepts designation of a thumbnail image as a position at which program reproduction is started, and accepts designation of image quality or method for reproduction. The map management unit 23 extracts a PTS value corresponding to the designated thumbnail image based on the thumbnail map, and records a recorded image corresponding to the extracted PTS value of the designated image quality or method based on the PTS map. Extract. Then, the playback processing unit 21 starts playback from the recorded image extracted by the map management unit 23.

  With such a configuration, it is possible to start playback from a recorded image created based on a program image corresponding to a specified thumbnail image with a specified image quality or method.

  In the recording apparatus according to the embodiment of the present invention, the thumbnail creation unit 18 creates a thumbnail image from the I picture of the program image included in the stream.

  With such a configuration, a PTS map of an I picture can be created, so that the PTS map can be used for special reproduction such as fast-forwarding. Further, since the reproduction process can be started only from the I picture, reproduction can be started from the recorded image corresponding to the thumbnail image.

  Further, in the recording apparatus according to the embodiment of the present invention, the thumbnail creating unit 18 selects a thumbnail from a recorded image created with the lowest image quality or a predetermined method among a plurality of recorded images created with different image quality or with a different method. Create an image.

  With such a configuration, it is possible to reduce the processing load for creating a thumbnail image.

  Further, in the thumbnail management information creating apparatus according to the embodiment of the present invention, the thumbnail creating unit 18 creates a thumbnail image from the program image included in the stream. The PTS value extraction unit 13 acquires a PTS value indicating the timing at which the program image corresponding to the thumbnail image should be displayed from the stream. Then, the thumbnail map creating unit 19 creates and stores a thumbnail map indicating the correspondence between the thumbnail image and the timing information.

  In this way, a thumbnail image is created, and a thumbnail image with a clear correspondence with the PTS value is obtained by acquiring the PTS value for designating the timing for displaying the program image corresponding to the created thumbnail image on the display device. Can be displayed. Further, the absolute time can be associated with the thumbnail image by using the PTS value instead of the recording elapsed time counted from the recording start time.

  In addition, since thumbnail images and thumbnail maps are created, when it becomes necessary to specify the absolute time corresponding to a thumbnail image, for example, when performing playback processing, the thumbnail image is referred to by referring to the thumbnail map. The absolute time corresponding to can be specified. Conversely, even when it becomes necessary to specify a thumbnail image corresponding to the absolute time, the thumbnail image corresponding to the absolute time can be specified by referring to the thumbnail map.

  Also, for example, when a thumbnail map is created during recording, it is not necessary to create a thumbnail image and a thumbnail map each time playback processing is performed, and the thumbnail image and absolute time can be specified by referring to the thumbnail map. it can.

  Further, although the stream acquisition device and the playback processing device according to the embodiment of the present invention are configured to perform stream reception processing in accordance with the MPEG2-TS standard, the present invention is not limited to this. It may be configured to perform stream reception processing according to another standard.

  The above embodiment should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 10 Recording apparatus 11 Antenna 12 Receiving part 13 PTS value extraction part (Display timing acquisition part)
14 Image quality conversion processing unit 15 Packet counting unit 16 HDD (storage unit)
17 PTS map creation unit (recorded image map creation unit)
18 Thumbnail creation unit 19 Thumbnail map creation unit 20 Start position designation unit 21 Playback processing unit 22 Memory 23 Map management unit 40 Media chip (thumbnail management information creation device)
43 PTS value extraction unit (display timing acquisition unit)
44 Image quality conversion processing unit 45 Packet counting unit 47 PTS map creation unit (recorded image map creation unit)
48 Thumbnail creation part 49 Thumbnail map creation part

Claims (10)

A recording device for recording a stream obtained by dividing information of one or more programs into a plurality of packets,
A thumbnail creating unit for creating a thumbnail image from program images included in the stream;
A display timing acquisition unit for acquiring timing information indicating the timing at which the program image corresponding to the thumbnail image should be displayed from the stream;
A thumbnail map creation unit for creating and saving a thumbnail map indicating the correspondence between the thumbnail image and the timing information;
Based on the thumbnail map, Bei example a reproduction processing unit for performing processing for displaying the program image corresponding to the designated the thumbnail image,
The thumbnail creation unit creates a thumbnail image from a recorded image created by processing a recorded image of a program image included in the stream,
The recording device further includes:
A recorded image map creating unit for creating and storing a recorded image map indicating a correspondence relationship between the timing information and the recorded image;
The reproduction processing unit performs processing for displaying the recorded image corresponding to the designated thumbnail image based on the thumbnail map and the recorded image map,
The thumbnail creating unit creates the thumbnail image from any one of a plurality of the recorded images created in different image quality or in a different method corresponding to the program image included in the stream,
The recorded image map creation unit creates and saves a recorded image map indicating a correspondence relationship between the timing information and the plurality of recorded images . The thumbnail map creation unit creates and saves a thumbnail map indicating a correspondence relationship between the timing information and thumbnail storage position information for specifying a storage position in a storage unit for storing the thumbnail image. Item 2. The recording device according to Item 1 . The display timing acquisition unit, as the timing information indicating the timing for displaying the program video, using a PTS (Presentation Time Stamp) values in the header of the packet including the program image, according to claim 1 or claim 2 Recording device. The recording image map creation unit creates said timing information, the recording image map showing the correspondence between the storage position information for identifying each storage location in the storage unit for storing said plurality of said recorded images The recording device according to claim 1 , wherein the recording device is stored. The recording device further includes:
A start position designation unit for accepting designation of a thumbnail image as a position to start reproduction of a program, and accepting designation of image quality or method when performing the reproduction;
The timing information corresponding to the specified thumbnail image is extracted based on the thumbnail map, and the recording corresponding to the extracted timing information of the specified image quality or the method based on the recorded image map is extracted. A map management unit for extracting images;
The recording apparatus according to claim 1 , wherein the reproduction processing unit starts reproduction from the recorded image extracted by the map management unit. The thumbnail creating unit creates the thumbnail image from the I-picture of the program image included in the stream, the recording apparatus according to any one of claims 1 to 5. The thumbnail creating unit creates the thumbnail images from being the said recorded images created with the lowest quality level or a predetermined method among the plurality of recorded images created with different quality or different manner, claim from claim 1 7. The recording device according to any one of items 6 . A thumbnail management information creating apparatus used in a recording apparatus for recording a stream obtained by dividing information of one or a plurality of programs into a plurality of packets,
A thumbnail creating unit for creating a thumbnail image from program images included in the stream;
A display timing acquisition unit for acquiring timing information indicating the timing at which the program image corresponding to the thumbnail image should be displayed from the stream;
Bei example a thumbnail map generator for creating and storing thumbnail map showing the correspondence between the thumbnail image and the timing information,
The thumbnail creation unit creates a thumbnail image from a recorded image created by processing a recorded image of a program image included in the stream,
The thumbnail management information creation device further includes:
A recorded image map creating unit for creating and storing a recorded image map indicating a correspondence relationship between the timing information and the recorded image;
The thumbnail creating unit creates the thumbnail image from any one of a plurality of the recorded images created in different image quality or in a different method corresponding to the program image included in the stream,
The recorded image map creation unit is a thumbnail management information creation device that creates and stores a recorded image map indicating a correspondence relationship between the timing information and the plurality of recorded images . A recording method in a recording apparatus for recording a stream obtained by dividing information of one or a plurality of programs into a plurality of packets,
Creating a thumbnail image from program images included in the stream;
Obtaining timing information indicating the timing at which the program image corresponding to the thumbnail image should be displayed from the stream;
Creating and storing a thumbnail map indicating the correspondence between the thumbnail image and the timing information;
Based on the thumbnail map, look including the step of performing a process of displaying the program image corresponding to the designated the thumbnail image,
In the step of creating the thumbnail image, a thumbnail image is created from the recorded image created by processing the recorded image of the program image included in the stream,
The recording method further includes:
Creating and storing a recorded image map indicating a correspondence relationship between the timing information and the recorded image,
In the step of performing the process of displaying the program image, based on the thumbnail map and the recorded image map, performing the process of displaying the recorded image corresponding to the specified thumbnail image,
In the step of creating the thumbnail image, the thumbnail image is created from any one of a plurality of the recorded images created in different image quality or different methods corresponding to the program image included in the stream,
A recording method in which, in the step of creating and saving the recorded image map, a recorded image map indicating a correspondence relationship between the timing information and the plurality of recorded images is created and saved . A recording program used in a recording apparatus for recording a stream obtained by dividing information of one or a plurality of programs into a plurality of packets,
Creating a thumbnail image from program images included in the stream;
Obtaining timing information indicating the timing at which the program image corresponding to the thumbnail image should be displayed from the stream;
Creating and storing a thumbnail map indicating the correspondence between the thumbnail image and the timing information;
Performing a process of displaying the program image corresponding to the specified thumbnail image based on the thumbnail map ,
In the step of creating the thumbnail image, a thumbnail image is created from the recorded image created by processing the recorded image of the program image included in the stream,
In addition,
A program for executing a step of creating and storing a recorded image map indicating a correspondence relationship between the timing information and the recorded image;
In the step of performing the process of displaying the program image, based on the thumbnail map and the recorded image map, performing the process of displaying the recorded image corresponding to the specified thumbnail image,
In the step of creating the thumbnail image, the thumbnail image is created from any one of a plurality of the recorded images created in different image quality or different methods corresponding to the program image included in the stream,
In the step of creating and saving the recorded image map , a recording program for creating and saving a recorded image map indicating a correspondence relationship between the timing information and the plurality of recorded images .

Images