WO2004081799A1 - 受信装置および情報閲覧方法 - Google Patents
受信装置および情報閲覧方法 Download PDFInfo
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- WO2004081799A1 WO2004081799A1 PCT/JP2004/002125 JP2004002125W WO2004081799A1 WO 2004081799 A1 WO2004081799 A1 WO 2004081799A1 JP 2004002125 W JP2004002125 W JP 2004002125W WO 2004081799 A1 WO2004081799 A1 WO 2004081799A1
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- Prior art keywords
- information
- media
- program
- data
- reception
- Prior art date
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/85—Assembly of content; Generation of multimedia applications
- H04N21/854—Content authoring
- H04N21/8543—Content authoring using a description language, e.g. Multimedia and Hypermedia information coding Expert Group [MHEG], eXtensible Markup Language [XML]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/431—Generation of visual interfaces for content selection or interaction; Content or additional data rendering
- H04N21/4312—Generation of visual interfaces for content selection or interaction; Content or additional data rendering involving specific graphical features, e.g. screen layout, special fonts or colors, blinking icons, highlights or animations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/431—Generation of visual interfaces for content selection or interaction; Content or additional data rendering
- H04N21/4312—Generation of visual interfaces for content selection or interaction; Content or additional data rendering involving specific graphical features, e.g. screen layout, special fonts or colors, blinking icons, highlights or animations
- H04N21/4314—Generation of visual interfaces for content selection or interaction; Content or additional data rendering involving specific graphical features, e.g. screen layout, special fonts or colors, blinking icons, highlights or animations for fitting data in a restricted space on the screen, e.g. EPG data in a rectangular grid
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
- H04N21/84—Generation or processing of descriptive data, e.g. content descriptors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/162—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing
- H04N7/163—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing by receiver means only
Definitions
- the present invention relates to a receiving apparatus and method for receiving and browsing contents including contents such as video, audio, text, or still images and layout information of the contents, and an information browsing method.
- contents such as video, audio, text, or still images and layout information of the contents, and an information browsing method.
- SM IL Synchronized Multimedia Integration Language
- SMIL is a description language similar to the hypertext description language HTML, which is very popular nowadays through the Internet, but is a more suitable description language for distributing multimedia data including moving images.
- the information from the third line, 1 ayout>, to the eighth line, ⁇ 1ayout>, is the content spatial rate information.
- regions v, t, and i in which moving images, texts, and still images are arranged are defined.
- 1 2nd line Up to 14th line define time information for playing video, audio, text, and still images, respectively.
- 1 " S included in each of the 2nd to 14th lines For rc ", the URL for acquiring the media is specified.
- the video and audio are recorded in RTSP (Real Time Streaming Protocol, Internet Draft RFC 2326) protocol, It is specified that text and still images are acquired using the HTTP protocol.
- the client 704 which is a content receiving terminal, acquires a SMIL file in which the content is described from the server 1 (701) via a network such as the Internet using a protocol such as HTTP. After obtaining the SMIL file, the client 704 interprets the SMIL file and obtains each described medium, that is, text, a still image, a moving image, audio, or the like from the server.
- the client 704 acquires moving image data and audio data from the server 2 (702), and acquires text data and still image data from the server 3 (703).
- the client 704 reproduces each of the described media at an appropriate position and an appropriate time based on the spatial information and the time information described in the acquired SMIL file.
- the receiving terminal can appropriately acquire the decoder. is there. As a result, it is possible to decode (decode) all types of multimedia data assumed by the receiving terminal.
- the above-described media distribution method does not consider the transmission state of multimedia data at all. That is, no consideration is given to the case where the receiving terminal cannot receive multimedia data.
- a receiving terminal far away from a base station may be able to receive media data at a low bit rate, and a receiving terminal near a base station may be able to receive media data at a high bit rate.
- a receiving terminal far from the base station may be difficult for a receiving terminal far from the base station to receive large-sized data such as video data and to receive only media such as text and still images.
- the multimedia data specified by SMIL cannot be received.
- the receiving device can decode (decode) all types of multimedia data specified by the transmitting side, there is a problem that the content specified by SMIL cannot be displayed properly. is there.
- An object of the present invention is to provide a receiving terminal capable of displaying content in a form suitable for the receiving state of the media when displaying the content composed of various media such as transmitted video, audio, still image, and text. It is to be.
- a transmitting side transmits a plurality of layout information for determining a display layout of at least one or more media and media data constituting the layout information
- a receiving side transmits the media from the transmitting side.
- the receiving side can select the layout information suitable for the receiving state of the medium and display the received medium using the selected layout information.
- FIG. 1 is a diagram showing a description example of an SMIL file
- Figure 2 illustrates how a client plays content stored on a server.
- FIG. 3A is a first diagram showing the media distribution system according to the first embodiment of the present invention.
- FIG. 3B is a second diagram illustrating the media distribution system according to the first embodiment
- FIG. 3C is a third diagram showing the media distribution system according to the first embodiment
- FIG. 4A is a first diagram illustrating a difference in program reproduction result according to a physical or logical distance from a relay node in the receiving terminal according to the first embodiment
- FIG. 4B is a second diagram for explaining a difference in the reproduction result of the program according to the physical or logical distance from the relay node in the receiving terminal according to the first embodiment
- FIG.4C is a third diagram for explaining a difference in the reproduction result of the program according to the physical or logical distance from the relay node in the receiving terminal according to the first embodiment
- FIG. 4D is a fourth diagram illustrating a difference in a program reproduction result according to the physical or logical distance from the relay node in the receiving terminal according to the first embodiment
- FIG. 5 is a schematic diagram showing an overall image of the media distribution system according to the first embodiment.
- FIG. 6 is a diagram showing a program table held by the server according to the first embodiment.
- FIG. 7 is a diagram showing a configuration of a reception management table according to the first embodiment.
- FIG. 8 is a diagram showing program information according to the first embodiment in SDP (Session D escription Protocol, IE i, Internet Draft RFC). 2327).
- FIG. 9 is a diagram in which the rate information in the first embodiment is described in SMIL.
- FIG. 10 is a diagram showing a format of a bucket header according to the first embodiment.
- FIG. 11 is a diagram for explaining an example in which program information according to Embodiment 1 is transmitted by SDP,
- FIG. 12 is a flowchart showing the operation of the server according to the first embodiment.
- FIG. 13 is a flowchart of the media transmission process of the server according to the first embodiment.
- FIG. 14 is a flowchart illustrating an operation of the receiving terminal according to Embodiment 1.
- FIG. 15 is a flowchart of the receiving process of the receiving terminal according to Embodiment 1.
- FIG. 16 is a flowchart illustrating a program selection process performed by the receiving terminal according to Embodiment 1.
- FIG. 17 is a flowchart showing layout information receiving processing of the receiving terminal according to Embodiment 1.
- FIG. 18 is a flowchart showing the AV data receiving process of the receiving terminal according to Embodiment 1.
- FIG. 19 is a flowchart illustrating text / still image data reception processing of the receiving terminal according to Embodiment 1.
- FIG. 20 is a flowchart illustrating a process of determining whether a receiving terminal can continuously receive data according to Embodiment 1.
- FIG. 21 is a flowchart illustrating an operation of a table management process of the receiving terminal according to Embodiment 1. ,
- FIG. 22 is a block diagram showing an overview of a content system according to Embodiment 2 of the present invention.
- FIG. 23 is a flowchart showing an operation of the receiving terminal according to the second embodiment.
- Embodiment 1 according to the present invention will be described with reference to the drawings.
- the usage of the communication network according to the first embodiment will be described with reference to FIGS. 3A to 3C. Will be described.
- 3A to 3C are diagrams showing a media distribution system according to the first embodiment.
- the media distribution system is configured so that the reception terminal 104 receives the content distributed from the server 102 as the transmission device via the communication network 101. It has become.
- the server 102 transmits contents for various media, such as moving images, sounds, music, texts, still images, layout information, and programs.
- the server 102 transmits program information and program data as contents.
- the program information includes the outline of the program, the start / end time of the broadcast, the communication port used for the broadcast (channels in TV broadcasting, specifically, the destination IP address and port number). Is the data describing the receiving conditions of the above.
- SDP SessOnDesCripipiontProtocoll
- the program data is media such as video, audio, music, text, still images, and programs, and layout information for displaying these media in combination.
- SMIL SynchronzizeldMultiemediaIntegagratioonLanguguage
- R JAVA
- the receiving terminal 104 is a terminal having a different display resolution or processing capability, such as a mobile phone, a TV, a PDA, and a personal computer.
- the receiving terminal 104 first receives the program information transmitted from the server 102, and opens a receiving channel for receiving program data described in the program information to receive the program data. Then, the receiving terminal 104 reproduces the program corresponding to the program information.
- the receiving terminal 104 may simultaneously receive a command from a plurality of servers that distribute the program. Further, the receiving terminal 104 may be capable of simultaneously connecting to not only a single transmission line but also a plurality of transmission lines.
- the communication network 101 may be a wired network (for example, ADSL, ISDN, ATM, FTTH, etc.) or a wireless network (for example, mobile phone, wireless LAN, etc.).
- a wired network for example, ADSL, ISDN, ATM, FTTH, etc.
- a wireless network for example, mobile phone, wireless LAN, etc.
- Communication devices are interconnected by a relay node 103 such as a router or a gateway (GW).
- a relay node 103 such as a router or a gateway (GW).
- the relay node 103 has a broadcast or multicast function, and can duplicate a data bucket in the relay node 103.
- a one-to-one type communication may be performed between the server 102 and the receiving terminal 104, or a one-to-N type communication between the server 102 and the receiving terminal 104 using a broadcast / multicast function. Communication may be performed.
- the program information and the program data may be transmitted using the same transmission path, or may be transmitted using different transmission paths.
- program information may be transmitted using a broadcast network
- program data may be transmitted using a communication network.
- the first embodiment may be configured to include a communication network 105 in which a wired network and a wireless network are interconnected as shown in FIG. 3B.
- Embodiment 1 may be a communication mode in which server 102 is present at various places, broadcasts data to a nearby area, and receiving terminal 104 receives the data, as shown in FIG. 3C.
- a Bluetooth protocol or a wireless LAN can be used as a transmission protocol.
- connection path between the server 102 and the receiving terminal 104 is not limited to the communication network 101, but may be a broadcasting network (for example, terrestrial digital broadcasting, satellite digital broadcasting, etc.) or a system configuration in which a broadcasting network and a communication network are integrated. You may.
- a broadcasting network for example, terrestrial digital broadcasting, satellite digital broadcasting, etc.
- one-to-one communication is performed between the server 102, the middle node, and the relay node 103 (section of the wired network).
- the distribution is performed between the relay node 103 and the receiving terminal 104 by using a broadcast function using a wireless network.
- FIGS. 4A to 4D are diagrams illustrating the difference in the reproduction result of a program in the receiving terminal 104 according to the physical or logical distance from the relay node 103.
- the server 102 transmits text data (201), low-resolution still image data 1 (202), still image data 2 (203), MPEG4 video stream data (204, 206), and high-resolution still image data. It is assumed that data 1 (205) is being transmitted.
- MPEG4 video stream data 204 and 206 are obtained by encoding the same image at high resolution and low resolution.
- the MPEG4 video stream data 204 is encoded at low resolution, and the MPEG4 video stream data 206 is encoded at high resolution.
- the server 102 is transmitting MPEG4 video stream data 204 as intra-coded frames (I frames) and MPEG4 video stream data 206 as inter-coded frames (P frames).
- the display result shown in FIG. 4A is a display result when receiving terminal 104 power S, text data 201, and low-resolution still image data 1 (202) can be received.
- text data 201 and low-resolution still image data 1 (202) are displayed on receiving terminal 104.
- the display result shown in Fig. 4B shows the reproduction of a program when still image data 2 (203) can be received in addition to text data 201 and low-resolution still image data 1 (202) at the receiving terminal 104.
- the receiving terminal 104 employs a layout suitable for displaying the text data 201, the low-resolution still image data 1 (202), and the still image data 2 (203).
- the display result shown in Fig. 4C shows that the receiving terminal 104 has text data 201, low angle?
- This is a reproduction result of a program when MPEG4 video stream data 204 can be generated in addition to the still image data 1 (202) and still image data 2 (203) of the image density.
- the receiving terminal 104 adopts a layout in which the MPEG4 video stream data 204 is arranged in the center, and the text data 201, the still image data 1 (202), the still image data 2 (203), and the reduced size are displayed. are doing.
- the receiving terminal 104 This is a program reproduction result when EG4 video stream data 206 and high-resolution still image data 1 (206) can be received.
- the receiving terminal 104 has a higher resolution of the still image data 1 and a higher video frame rate than the case shown in FIG. 4C.
- the receiving terminal 104 displays a program by performing an appropriate rating suitable for those media, and furthermore, the information is transmitted by many media. If it can be displayed, the program is displayed by performing a rating suitable for those media.
- FIG. 5 is a schematic diagram illustrating an overall image of the media distribution system according to the first embodiment.
- the server 102 which is a content transmission device, includes a data management unit 301, It comprises a management section 314, a transmission control section 304, a program information generation section 312, and a transmission section 30.5.
- the data management unit 301 has a program table 3 O la, a late information storage unit 301 b for storing the late information, and an AV data storage unit 30 for storing the MPEG 4 video stream data 204, 206. 1 c, a still image storage unit 301 d for storing still image data 202, 203, 205, and a text storage unit 301 e for storing text data 201 .
- the data management unit 301 is a recording medium represented by a hard disk drive.
- the program table 301a is a table for storing information on programs. Each program is broadcast based on this program table 3Ola.
- FIG. 6 is a diagram showing the program table 3Ola held by the server 102.
- the program table 301a stores information of one program, and the server 102 holds the program table 3Ola for the number of programs to be broadcast. In FIG. 5, only one program table 301a is shown for simplification of the drawing.
- the program table 301a is divided into session information 401 and media information 402.
- the session information 401 represents information on the entire program, and the media information 402 represents information on each medium constituting the program.
- Title 400 represents the title of this program.
- the session number 404 is a number uniquely indicating this program.
- the destination address 406 indicates the destination address of the data, and indicates to which address the program data is to be transmitted.
- the media information 402 has information such as the name of the file 407, the name of the transmission 408, the type of the media 409, the required flag 411, and the transmission cycle. .
- the file name of the file stored in the media (program) is described in the name of the file.
- the file name 407 is the name of media data and layout information.
- the transmission name 408 indicates an identifier assigned to uniquely identify the data when the media data is transmitted. This information is used to specify each media in the layout information. In addition, the transmission name of each media is input to the program information.
- the media type 409 indicates the type of the media. This information is input to the program information and transmitted to the receiving device.
- the mandatory flag 410 sets whether or not to allow the receiving terminal 104 to play back a program using the late information having the media as a constituent media when the corresponding media data cannot be played back. It is a flag to indicate. In other words, the mandatory flag 410 is a flag indicating whether or not the medium is essential for reproducing the rate information.
- the mandatory flag 4100 When the mandatory flag 4100 is set to 1, if the media cannot be played, the program is not allowed to be played using the rate information that has the media as a component of the rate.
- the essential flag 410 indicates whether the medium is an essential medium for the corresponding rate information.
- the mandatory flag 410 is described in the program information or the rate information and notified to the receiving device.
- the transmission cycle 'number of repetitions 4 1 1' indicates the repetition cycle of the transmission of the media data when the media data to be transmitted is a still image or text data, and indicates that the media data to be transmitted is stream data. Is the street Indicates how many times the data is transmitted.
- the stream data is A u d i o and V i d e.
- the number of repetitions is infinite (the transmission is continued until the server 102 issues a stop instruction).
- the program table 301 a is configured as described above.
- the program broadcast management section 314 manages the start and end of broadcast of each program.
- the program broadcast management unit 314 stores the program reproduction start and end times, and starts transmission of the program when the transmission start time comes, and ends transmission of the program when the end time comes.
- the program broadcast management unit 314 reads information about the session information 401 from the program table 301a of each program, and broadcast start time and end time of the program recorded there. Remember 5 Then, at the broadcast start time of each program, the program broadcast management section 314 instructs the transmission control section 304 and the program information generation section 312 to start broadcasting the program. Also, when the end time comes, the program broadcast management section 3 14 instructs the transmission control section 304 and the program information generation section 3 12 to end the broadcast of the program.
- the transmission control section 304 reads out the media information 402 of the instructed program table 301a according to the broadcast start instruction from the program broadcast management section 310, and reads the file name 400 of the media information 402. Read media data and rate information that constitute program data based on 7.
- the transmission control unit 304 transfers the read program data to the transmission unit 304.
- the transmission control unit 304 stops the broadcast of the specified program based on the broadcast end instruction from the program broadcast management unit 314.
- the program information generation unit 312 reads out the program information of the instructed program from the data management unit 301 in accordance with the broadcast start instruction from the program broadcast management unit 314. If necessary, information on the broadcast channel of the program data (such as the destination IP address and port number of each media data) is added to the program information. Then, the program information generation unit 312 passes the program information to the transmission unit 3005 at a fixed cycle. Also, the program The information generation unit 312 ends the delivery of the program information of the indicated program to the transmission unit 2005 in accordance with the broadcast end instruction from the program broadcast management unit 314.
- the server 102 needs to be provided with the program information generation unit 312. There is no.
- the transmission unit 305 is an interface capable of transmitting data to the IP network. Further, the transmission section 305 has a function of bucketing the program information and the program data received from the program information generation section 3112 and the transmission control section 304. Further, the transmission unit 3005 has a function of transmitting program information to a predetermined program information channel and transmitting program data to a predetermined channel based on the program information.
- the program information may be generated in real time or may be generated in advance before broadcasting. Also, the program information need not necessarily be transmitted together with the program data, but may be transmitted by another means.
- another server for transmitting the program information may be prepared, and the receiving apparatus may acquire the information from the server by using HTTP or the like.
- the receiving terminal 104 includes a terminal control unit 310, a reception control unit 307, a program selection unit 317, a reproduction control unit 308, a display unit 316, a reception data management unit 318, and transmission. Part 3 15 is provided.
- the terminal control section 310 controls the entire receiving terminal 104. Although the signal lines from the terminal control unit 310 to other processing units are omitted in FIG. 5 for simplification of the drawing, there are actually signal lines for all the processing units.
- the reception control unit 307 accumulates the data received by the transmission unit 315 in the buffer 320. Then, the reception control section 307 determines the type of the stored data, and passes the data to the program selection section 317 when the received data is program information. If the received data is rate information, the reception control section 307 It analyzes the priority of the layout information, the media constituting the layout, whether or not the display of each media is indispensable, and fills in the received data management table 319 described later.
- the reception control section 307 determines whether or not the media playback preparation is completed, and writes the result in the reception data management table 319. In addition, the reception control unit 307 determines whether the media data can be continuously received, and writes the determination result in the reception data management table 319.
- the reception control section 307 has the above functions.
- the program selection unit 317 selects a program to be received from the program information received from the reception control unit 307, and instructs the transmission unit 315 to receive.
- the program selection unit 317 may select a program to be received according to an instruction from a viewer, or the receiving terminal 104 may automatically select the program.
- the program selection unit 317 randomly selects from the received program information.
- the program selection unit 317 causes the display unit 316 to display a list of programs such as program titles. Then, the viewer selects an arbitrary program from the program list displayed on the display unit 3 16.
- the program selection unit 317 obtains a channel for receiving the program data of the program currently being broadcast from the program information.
- the program information is transmitted from the server 102 that transmits the program data.
- the program information can be obtained by another method. For example, there is a method of acquiring from an HTTP server using HTTP.
- the reception data management unit 318 holds the reception data management table 319, detects an update of the reception data management table 319, and determines layout information to be used based on the table management processing described later. Then, the reproduction control unit 308 is notified. The reproduction control unit 308 reads the rate information determined by the reception data management unit 318. Reproduction processing of the program data is performed based on the rate information obtained from the reception control unit 307.
- the reproduction control unit 308 performs various types of decoding processing for decoding processing when reproducing video and audio.
- a standardized method such as MPEG4 or MPEG2 may be used, or a non-standardized method may be used.
- the reproduction control unit 308 determines a display position and a display timing of the text / animation in order to combine the decoded information.
- a standardized method such as MPEG2SMIL or a non-standardized method may be used.
- the transmission unit 315 is an interface capable of receiving a data bucket from the IP network.
- the transmission section 315 has a function of opening a channel for receiving program information to receive program information, and a function of opening a channel instructed to start reception by the program selection section 317 to receive program data.
- the transmission unit 315 has a function of extracting data from the various data buckets received and passing the data to the reception control unit 307. Further, the transmission unit 315 has a function of closing the channel instructed to end reception from the program selection unit 317 and stopping reception of program data.
- the program information and the program data are transmitted on the same transmission path.
- each The signals may be received on different transmission paths.
- the display unit 316 presents various media such as AV data, text, and still images decoded by the playback control unit 308 to the viewer at the timing determined by the playback control unit 308. is there. Specifically, presentation to the viewer is performed using a video display device typified by CRT or LCD, and a sound reproduction device such as a speaker.
- FIG. Fig. 7 Is a diagram showing the configuration of the reception management table 319.
- the data reception management table 319 includes a rate information table 901 and a media table 902.
- the rate information table 901 has fields of priority 903, configuration medium 904, and mandatory flag 905.
- the priority field 903 describes the priority of each layout information.
- the priority is a value indicating which layout is preferentially adopted.
- the priority is higher for layouts that can express content in more detail.
- the priority may be explicitly or implicitly transmitted from the server 102 as the transmitting terminal, or may be determined according to the display policy of the receiving terminal 104.
- the priority of the priority (field) 903 may be explicitly notified from the server 102 using program information or a bucket header, and the notified value may be used. There is also a method in which notification is made explicitly according to a predetermined agreement between 2 and the receiving terminal 104.
- the rate information with the longest transmission interval corresponds to the one that uses a small number of receiving terminals 104, and may include media with a larger amount of information. Therefore, this makes it possible to increase the priority of layout information having a larger amount of information. As a result, the receiving terminal 104 receives a plurality of layout information. When the information becomes reproducible, late information having a larger amount of information can be selected.
- the receiving terminal 104 may select “the layout information including the video has the highest priority” or “the one that uses a large number of media. There is also a method of registering a policy such as "highest priority” and playing back according to that policy.
- the priority of the layout information having the largest number of media or including video media, that is, preferably expressed can be increased.
- the receiving terminal 104 can select layout information that is preferably represented when a plurality of pieces of layout information can be reproduced.
- the receiving terminal 104 has a rule that, among the reproducible layout information, the layout information having the highest priority (in the example in the figure, the smaller the value, the higher the priority), is to reproduce the layout information with priority .
- that the layout information can be reproduced means that a part of the media data constituting the layout is in a reproducible state.
- the state in which media data can be played is the state in which pre-buffering has been completed in the case of stream data, and the state in which all media data constituting the medium have been received in the case of text and still image data.
- the configuration media field 904 indicates the media that configures each layout.
- the receiving terminal 104 obtains the media described in the configuration media field 904 by analyzing the rate information.
- the receiving terminal 104 can also acquire the media constituting each layout from the program information.
- the mandatory flag 905 is a flag indicating whether or not the media must be in a playable state in order to perform playback using the layout information. is there.
- the layout information of priority 1 is composed of textl, image, image2, audiol, and videol.
- the mandatory flag 905 is set to S1. Audio 1 and video 1 must be ready for playback. For other media, even if playback is not possible, you can play with the media display area blank.
- the information of the essential flag 905 is stored in the layout information, and the receiving terminal 104 acquires the information and inputs the information to the layout information table 901. If the information of the essential flag 905 is described in the program information, the information may be obtained from the program information and input.
- the media table 902 includes a transmission name (media name) 906, a priority 907, a reception completion flag 908, and a reception continuation possible flag 909.
- the transmission name (field) 906 describes the transmission name of the media notified from the server 102 by the program information.
- Priority (field) 907 describes the priority indicating which medium is to be preferentially used when there are media transmitted with the same transmission name.
- image 1 is transmitted with high-resolution data and low-resolution data to be transmitted. Therefore, if the receiving terminal 104 can receive a high-resolution one, it needs to give priority to a display of a low-resolution one. Therefore, the priority of the high-resolution image 1 is higher than the priority of the low-resolution image 1.
- This priority may be explicitly stored in the program information or the bucket header and sent from the server 102, or may be implicitly notified by a predetermined agreement between the server 102 and the receiving terminal 104. You may.
- the order described in the program information indicates the priority of the media. If the layout information with a longer transmission interval has a higher priority, it is considered that the larger the data amount of the power media, the higher the priority.
- the priority of media in the base layer alone is low, and playback and base layer
- the priority (field) 907 should be filled in so that the priority of the media combining the and the enhancement layer is higher.
- reception completion flag (field) 908 a reception completion flag indicating that the medium is in a playable state is described.
- the reception completion flag is set to 1 when pre-buffering is completed.
- the reception completion flag is set to 1 when the reception of all the media data that constitutes the media is completed.
- a continuous reception possible flag indicating whether or not the media data can be continuously received is described.
- Continuous reception means that packets can be received continuously to some extent. For example, if the bucket loss rate is below a certain threshold, the continuous reception possible flag is set to 1, and if the bucket loss rate exceeds the threshold, the reception continuous possible flag is set to 0.
- the reception control section 307 of the receiving terminal 104 updates the layout information table 901 when receiving the program information and the layout information, and updates the media table 902 when receiving the program information and the medium. . Also, as a result of updating, when the layout information to be reproduced changes, the receiving terminal 104 changes the layout information to be reproduced and performs reproduction.
- an appropriate program display corresponding to receivable data is realized by selecting a piece of layout information that can be played back by the receiving terminal 104 from a plurality of layout information and playing back the selected piece of layout information.
- the receiving terminal 104 In order for the receiving terminal 104 to select appropriate rate information, the receiving terminal 104 needs to 1) prioritize layout information, and 2) media data. , 3) the media data that makes up the layout, 4) the media data required to play the layout, and 5) the media transmission name, must be determined in some way.
- the server 102 notifies the receiving terminal 104, 1) to 5) described above, of the program information.
- FIG. 8 is a diagram in which the program information in the first embodiment is described in SDP (SessionDescripiptiontProtocoll, IETF Int er nt Dr aft RFC 2327).
- the session information portion of the SDP is omitted, and only the media information portion is described.
- the program information 1800 indicates that text, still image, still image, video, audio, and layout information are transmitted as program data.
- the media information of the still image is described in a portion indicated by 1802.
- multiple still images are described to be transmitted with the same transmission name (transmitted with payload types 104 and 105, respectively).
- the terminal 104 it is necessary for the terminal 104 to notify the terminal 104 which media data should be used preferentially.
- the program information 1800 indicates that data transmitted with the payload type 104 has a priority of 1 and data transmitted with the payload type 105 has a priority of 2.
- the portion indicated by 1804 of the program information 1800 describes that video data is transmitted.
- video data it is set so that I-frames and P-frames of MPEG 4 are transmitted with different payload types.
- the portion indicated by 1806 of the program information 1800 indicates that the late information is transmitted.
- a medimap: field indicates the media constituting the rate information and whether the medium is indispensable for the playback of the rate.
- the media to which multiple data is transmitted with the same name is the constituent media. If so, either of them should be received.
- the dependent media is expressed by using a slash as "ku PT1> Zku PT2>" (meaning either "ku PT1> or ku PT2>").
- the layout information of “payload type 100 is the media (ima) of the payload type 109 described before“; ”. ge 2) as a mandatory media, and the payload type 102 (textl) and either 104 or 105 (ima gel) described after ";" as non-essential media. " Represents.
- the receiving terminal 104 can know the information of the configured media without analyzing the layout information, and the processing load of the terminal can be known. Can be lowered.
- the receiving terminal 104 may be configured to detect the information of the media constituting the layout information by analyzing the layout information.
- the server 102 may notify the receiving terminal 104 of 4) media data necessary for reproducing a layout by using the layout information.
- FIG. 9 is a diagram describing the rate information in the first embodiment in SMIL.
- the layout information 1900 The media data included in this layout is described.
- the receiving terminal 104 can record 4) the media data required for reproducing the layout. Can be notified.
- the server 102 may notify the receiving terminal 104 of 1) the priority of the layout information and 2) the priority of the media data using a packet header.
- FIG. 10 is a diagram illustrating a format of a packet header according to the first embodiment.
- a bucket header 2000 shown in FIG. 10 is an example of a case where a data bucket is transmitted by RTP.
- the description of the portion described in 2001 of the packet header 2000 is within the range of the RTP standard, and therefore the description is omitted.
- the description of the portion described in 2002 of the packet header 2000 is a format when the RTP is extended.
- 1 ength is a field for inputting the length of the extension field (the portion described in 2002) in bytes.
- the priority field is a field for inputting the priority of the medium. This field is used to assign the rate information and the priority of the medium. Reserved is reserved Yes, do not use.
- the receiving terminal 104 can recognize 1) the priority of the layout information and 2) the priority of the media data by analyzing the packet header 2000.
- FIG. 11 is a diagram for explaining an example of a case where program information according to Embodiment 1 is transmitted by SDP.
- the fields indicated by 2105 and 2106 are fields in which information on the layout information is described.
- the priority assigned to the program information can indicate the priority of use of the late information.
- the receiving terminal 104 can determine 1) priority of layout information, 2) media The priority of the data, 3) the media data that composes the layout, 4) the media data required to play the layout, and 5) the transmission name of the media can be determined.
- FIG. 12 is a flowchart showing the operation of server 102 in the first embodiment.
- the program broadcast management section 314 When the server 102 is started, the program broadcast management section 314 first reads and stores the transmission start / end time 405 of the program table 3Ola corresponding to the program to be processed (step 501).
- the program broadcast management section 314 waits until the transmission start time or the end time comes (step 502). Then, when the transmission start time of a certain program comes (step 503), the program broadcast management unit 314 extracts the media information 402 of the program table 301a of the program, and transmits the information of the data to be transmitted. Is stored (step 504).
- the program information generation unit 312 of the server 102 refers to the file name 407 of the media information 402 stored by the program broadcast management unit 314, and converts the media data and the rate information included in the media information 402. By allocating transmission channels (step 505), program information is generated and transmitted to the receiving terminal 104 via the transmission unit 305 (step 506).
- the transmission control section 304 starts the media transmission processing (step 507).
- the details of the media transmission processing will be described later.
- FIG. 13 is a flowchart of the media transmission process of the server 102 according to the first embodiment.
- the media transmission process is performed for each media data.
- the transmission control section 304 refers to the media information 402 of the program table 301a of the data management section 301, and extracts the file name 407 included in the program. Then, the transmission control unit 304 stores the media data and the layout information corresponding to the extracted file name 407 in the layout information storage unit 301 b, the AV information storage unit 310 c, and the still image storage unit 304. 1d, read from the text storage unit 301e (step 601).
- the transmission control section 304 divides the read media data and layout information and sends them to the transmission section 305.
- the transmission unit 305 adds the packet header to the transmitted data and converts it into a bucket (step 602).
- the transmission unit 305 periodically transmits the bucket repeatedly from the transmission control unit 304 until there is an instruction to stop transmission of the generated bucket to the receiving terminal 104 (step 604). Thereafter, if there is a transmission stop instruction from the transmission control section 304 (step 605), the data transmission processing is terminated.
- server 102 transmits the media data and the layout information to receiving terminal 104.
- FIG. 14 is a diagram illustrating an operation of receiving terminal 104 according to the first embodiment.
- the transmission unit 315 opens a predetermined channel for receiving program information (step 1001).
- the receiving terminal 104 starts a receiving process by a receiving control unit 307 described later (step 1002), and a table by a receiving data managing unit 318 described later.
- the management process is started (Step 1003).
- each processing unit of the receiving terminal 104 waits for a termination instruction from the terminal control unit 310 (step 1004).
- the transmission unit 315 closes the program information reception channel (step 1005), the reception control unit 307 stops the reception process (step 1006), and the reception data management unit 318 performs the table management process. Is stopped (step 1007).
- the receiving terminal 104 starts the operation and ends the operation.
- FIG. 15 is a flowchart of the receiving process of the receiving terminal 104.
- the reception process is an operation when program information and program data are received, and a process when a user selects a program.
- the reception control unit 307 of the receiving terminal 104 determines whether or not the user has selected a program (step 1101), and if a program is selected, performs a program selection process described later (step 1102).
- reception control section 307 determines whether or not a termination instruction has been received from terminal control section 310 (step 112), and receives the termination instruction. If so, the receiving process ends.
- the transmission unit 315 subsequently receives data such as program information and program data and sends it to the reception control unit 307 (step 1103).
- reception control section 307 determines whether or not the received data is program data (step 1104).
- the reception control unit 307 determines whether the received data is program information (Step 1105).
- the reception control unit 307 instructs the program selection unit 317 to acquire the title of the program.
- program selection The selector 317 obtains the title of the program (step 1106). Then, the program selector 317 presents the program title to the user (step 1107), and returns to step 1101.
- reception control section 307 determines whether or not the received data is layout information (step 1108). Then, a layout information receiving process described later is performed (step 1109), and the process returns to step 1101.
- reception control section 307 determines whether or not the data is AV data (step 110). If the received data is AV data, the reception control section 307 performs an AV data reception process described later (step 111), and returns to step 1101.
- the reception control unit 307 determines whether the received data is text / still image data (step 111). ), Text or still image data, a text 'still image data receiving process is performed (step 1 1 1 3), and the process returns to step 1101.
- the receiving terminal 104 performs the receiving process.
- FIG. 16 is a diagram illustrating the program selection processing of the receiving terminal 104.
- the program selection process is a process of step 1102 shown in FIG.
- the reception control unit 307 determines whether or not another program is currently being reproduced on the reception terminal 104 (step 1201).
- the reception control section 307 creates a layout information table 901 and a media table 902 from the media information of the program information to be received this time (step 1205).
- the reception control unit 307 receives the program from the transmission unit 315. Then, the transmission unit 315 opens the reception channel of the program (step 1206), and ends the processing.
- the reception control section 307 closes the receiving channel of the program being played back in order to process the program received this time (step 1202). 2) The reproduction of the currently reproduced program is stopped (step 1203), and the information stored in the reception data management table 319 is deleted (step 1204). Then, the reception control section 307 shifts to the processing of step 125.
- the receiving terminal 104 performs the program selection process.
- FIG. 17 is a diagram showing the rate information receiving process of the receiving terminal 104. This process is the process of step 1109 shown in FIG.
- the reception control unit 307 checks whether all the divided data are complete (step 1301). .
- the reception control section 307 saves the data in the buffer 320 and returns (step 1302).
- the reception control section 307 reads out the data stored in the buffer 320, forms the late information, and analyzes the media constituting the late information (step 13). 0 3).
- the reception control unit 307 acquires the essential flag of each constituent medium (Step 1304).
- the reception control section 307 inputs the priority 903, the constituent medium 904, and the required flag 905 to the rate information table 901 (step 13305), and The layout information table 901 is saved, and the process ends (step 1306).
- FIG. 18 is a flowchart showing the AV data receiving process of receiving terminal 104 in the first embodiment.
- the AV data receiving process is a process of step 111 shown in FIG.
- the reception control section 307 determines whether or not the received data is AV data that has been received for the first time after receiving the program (step 1401). If the data is the first received data, the reception control unit 307 starts the pre-buffering process (step 1402).
- the pre-buffering process is a process of storing data without performing playback for a certain period of time after receiving the AV data. After that, it proceeds to the processing of step 1406.
- reception control section 307 determines whether or not pre-buffering has been completed (step 1403). ), If the pre-buffering has not been completed, the process proceeds to step 1406.
- the reception control section 307 inputs the priority of the medium to the media table 902 (the information of the priority is explicitly described). If the notification is made by the program information or the bucket header, the information is input. (Step 1444), and the corresponding reception completion flag of the media tape drive 902 is set to 1. (Step 1405).
- the reception control unit 307 performs a continuation reception enable determination process to be described later (step 1406), stores the received data in the buffer 320, and ends the AV data reception process. (Step 1407).
- the reception control section 307 performs AV data reception processing.
- FIG. 19 is a flowchart showing the text 'still image data receiving process.
- Text 'still image data reception processing is step 1 shown in Figure 15 This is the processing of 1 13.
- the reception control unit 307 checks whether all the divided data are complete (step 15). 0 1).
- reception control section 307 saves the data in the buffer 320 and proceeds to the processing of step 1506.
- the reception control section 307 When all the data are collected, the reception control section 307 reads the media data stored in the buffer 320 and forms a medium. Then, the reception control unit 307 inputs a priority in a corresponding column of the media table 902 (when the priority information is explicitly notified, the priority information is notified by program information or a packet header). So enter that information) (step 1503). Next, the reception control section 307 sets the corresponding reception completion flag of the media table 902 to 1 (step 1504).
- the reception control section 307 saves the text / still image data, which is media data, in the buffer 320 (step 1505).
- reception control unit 307 performs a continuous reception enable determination process described later (step 1506), and ends the process.
- the reception control unit 307 performs the text / still image data reception processing.
- FIG. 20 is a flowchart illustrating a process of determining whether or not receiving terminal 104 can continuously receive in Embodiment 1. This processing is the processing of step 1406 in FIG. 18 and step 1506 in FIG.
- the reception control section 307 calculates the packet loss rate L of the media data (step 1601).
- the bucket loss rate can be calculated from the history of buckets received in the past.
- packet loss a sequence number is assigned to a packet, and Can be detected.
- the reception control unit 307 determines whether or not the packet loss rate L is larger than a threshold L 1 (fixed ⁇ S set in advance) (step 1602). It is determined that it is difficult to receive the media continuously, and the continuous reception flag 909 of the corresponding medium is set to 0 (step 163).
- the reception control section 307 determines whether or not the packet loss rate L is smaller than the threshold value L2 (a fixed value set in advance and a value smaller than L1) (step 1604). ), If it is smaller, it is determined that the bucket can be continuously received, the continuous reception possible flag 909 of the corresponding medium is set to 1, and the processing is terminated (step 1605).
- L2 a fixed value set in advance and a value smaller than L1
- the receiving terminal 104 sets the continuous reception flag 909, and determines that the medium can be played when the continuous reception flag 909 is 1 by It is possible to prevent the receiving terminal 104 located at the boundary of the zone from performing unstable reproduction.
- FIG. 21 is a flowchart illustrating the operation of the table management process of receiving terminal 104 in the first embodiment.
- the reception data management unit 318 waits until the contents of the reception data management table 319 are updated (step 1701).
- the reception data management section 3 18 first refers to the layout information table 901, and has the highest priority 903, that is, the most detailed. Then, layout information that can display data is selected and processed (step 1702).
- the reception data management unit 318 configures the configuration of the rate information to be processed.
- the media is acquired from the layout information table 901 (step 1703), and the following playability determination processing is performed for each constituent medium.
- the reception data management unit 318 represents the individual configuration media of the rate information to be processed as configuration media 1 to N.
- N is the number of constituent media.
- the reception data management unit 318 refers to the information of the configuration medium i from the media table 902 (step 1704), and if the configuration medium i has a plurality of priorities, the configuration The highest-priority media i is selected and the following processing is performed (step 1705).
- the reception data management unit 318 confirms that the reception completion flag ⁇ ⁇ ⁇ ⁇ and the continuous reception enable flag of the medium selected in step 1705 are 1 (step 1706, step 1707). .
- Step 1708 the reception data management unit 318 determines that the medium can be played back and determines the next medium (composed medium i + 1). (Step 1708), the process returns to Step 1705 and continues.
- the reception data management unit 318 performs a reproducibility determination process for all N media (step 1709).
- the reception data management section 318 determines whether or not one or more media can be played (step 1710). If one or more media can be played, the selected data is selected. Playback is started based on the late information (step 1711).
- step 1717 If there is no termination instruction from the terminal control unit 310 (step 1717), the reception data management unit 318 returns to the process of step 1701, and if the termination instruction is not received. If so, the process ends.
- the reception data management unit 318 determines that this rate information cannot be played back. Go to step 1 7 1 2.
- step 1712 the reception data management unit 318 determines whether there is any layout information having a lower priority than the layout information currently being processed, that is, whether there is other layout information.
- the reception data management unit 318 selects the layout information having the next highest priority next to the layout information currently being processed (step 1713). Then, the process proceeds to Step 1703.
- step 1712 if there is no low-priority rate information in step 1712, it means that there is no reproducible rate, so the flow advances to step 1701 to wait for the update of the reception data management table 319.
- the reception data management unit 318 determines whether there is a lower priority among the constituent media i in order to detect a reproducible medium (step 1714). If there is one having a lower priority, the reception data management unit 318 selects the next lowest priority (step 1715), and proceeds to the processing of step 1706. move on.
- the reception data management unit 318 confirms the mandatory flag 905 of the medium (step 1716) If the required flag is 0, the media data does not necessarily need to be played, and the process proceeds to the next media playability determination. On the other hand, if the required flag is 1, the received data management unit 318 determines that this rate cannot be reproduced because the media that requires reproduction cannot be reproduced. Then, go to Step 1 ⁇ 1 2.
- the receiving terminal 104 can determine whether or not to reproduce the rate information in a state where some media data cannot be reproduced by referring to the essential flag.
- the receiving terminal 104 performs the table management process.
- receiving terminal 104 can select rate information suitable for the received media data, and display the received media data using the selected rate information. For example, when the receiving terminal 104 receives only text and still images, it performs the appropriate rating for only text and still images and displays it, and can receive video, audio, still images, and text. In addition, it is possible to perform the display by performing a rating suitable for these media. That is, when the receiving terminal 104 displays content including various media such as transmitted video, audio, still images, and text, the content can be displayed in a form suitable for receivable media data.
- the operation of the server 102 and the receiving terminal 104 in the first embodiment may be programmed, stored in a storage medium, and executed by a general-purpose computer.
- the point of transmission of the content (same as program data in the case of broadcasting) is transmitted from the receiving terminal, and the method of acquiring detailed information of the content (program information in the case of broadcasting) Is different from the broadcast type.
- the content distribution method is the same as for broadcasting.
- the usage of the target communication network is the same as that shown in FIG.
- FIG. 22 is a block diagram illustrating an overall image of the content system according to the second embodiment.
- a content distribution management unit 222 is arranged in the server 222 in place of the program broadcast management unit 314, and a program selection unit is arranged in the receiving terminal 222.
- the difference is that a content selection section 2207 is arranged instead of 3170.
- the other parts are the same, so the same reference numerals are given and the detailed description is omitted.
- the content distribution management unit 222 is a means for receiving the content distribution request from the receiving terminal 2221, and managing the distribution of the content. Content distribution is controlled by protocols such as HTTP and RTSP.
- the content selection unit 222 has an interface that allows the user to input a URL, and has a function of acquiring layout information according to the URL input by the user. At this time, it is assumed that the content selection unit 222 obtains a plurality of pieces of layout information.
- FIG. 23 is a flowchart showing the operation of receiving terminal 2 211 in the second embodiment.
- the receiving terminal 2221 obtains the URL of the layout information input by the user in the content selection unit 2207 (step 2300). Subsequently, the reception control unit 307 acquires the rate information from the server 222 via the transmission unit 315 based on the URL acquired in Step 230. (Step 2301).
- the reception control unit 307 acquires a plurality of pieces of rate information, and the priority of the rate information is described in the rate information itself. Subsequently, the reception control unit 307 acquires the URL of the media described in each rate information (step 2302), and transmits a transmission request for the media to the transmission unit 315 based on the URL. Then, the transmission unit 315 sends a media transmission request to the server 2206 (step 2303).
- the reception data management unit 318 selects a layout based on the receivable media data (step 2304), and reproduces the layout. Yes (Step 23 05).
- the method for selecting the layout information is as described in the first embodiment.
- the reproduction control unit 308 stops reproduction and ends (step 2306).
- a system in which the media distribution system according to the first embodiment is applied to a communication type can be realized.
- the server 102 when the server 102 sends a plurality of pieces of rate information and media to the receiving terminal 104, the receiving terminal 104 can transmit various types of media such as video, audio, still images, and text.
- the contents When displaying different contents, the contents can be displayed in a form suitable for the receiving state of the media.
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Information Transfer Between Computers (AREA)
Abstract
Description
Claims
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US10/547,315 US7650567B2 (en) | 2003-03-10 | 2004-02-24 | Reception apparatus and information browsing method |
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JP2003064120A JP4308555B2 (ja) | 2003-03-10 | 2003-03-10 | 受信装置および情報閲覧方法 |
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- 2003-03-10 JP JP2003064120A patent/JP4308555B2/ja not_active Expired - Fee Related
-
2004
- 2004-02-24 US US10/547,315 patent/US7650567B2/en not_active Expired - Fee Related
- 2004-02-24 EP EP04713998.5A patent/EP1603046B1/en not_active Expired - Lifetime
- 2004-02-24 CN CNB2004800065602A patent/CN100435121C/zh not_active Expired - Fee Related
- 2004-02-24 WO PCT/JP2004/002125 patent/WO2004081799A1/ja active Application Filing
Patent Citations (4)
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JP2000020510A (ja) * | 1998-07-06 | 2000-01-21 | Canon Inc | デジタルデータ文書配布方法及びその装置 |
JP2001134518A (ja) * | 1999-11-02 | 2001-05-18 | Nec Corp | データ通信装置およびデータ通信システム |
JP2002351781A (ja) * | 2001-05-30 | 2002-12-06 | Fujitsu Ltd | 画面表示用ページレイアウトを利用したコンテンツ生成装置 |
JP2004054712A (ja) * | 2002-07-22 | 2004-02-19 | Sony Corp | 電子機器装置、サーバ装置、レイアウト記述文書の提供方法 |
Non-Patent Citations (1)
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8326058B2 (en) | 2004-02-09 | 2012-12-04 | Sanyo Electric Co., Ltd. | Image coding apparatus, image decoding apparatus, image display apparatus and image processing apparatus |
US8150173B2 (en) | 2004-10-29 | 2012-04-03 | Sanyo Electric Co., Ltd. | Image coding method and apparatus, and image decoding method and apparatus |
US8208738B2 (en) | 2004-10-29 | 2012-06-26 | Sanyo Electric Co., Ltd. | Image coding method and apparatus, and image decoding method and apparatus |
Also Published As
Publication number | Publication date |
---|---|
JP4308555B2 (ja) | 2009-08-05 |
EP1603046A1 (en) | 2005-12-07 |
CN1759384A (zh) | 2006-04-12 |
US7650567B2 (en) | 2010-01-19 |
EP1603046A4 (en) | 2007-12-05 |
CN100435121C (zh) | 2008-11-19 |
US20060168517A1 (en) | 2006-07-27 |
JP2004272712A (ja) | 2004-09-30 |
EP1603046B1 (en) | 2013-06-19 |
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