JP2006340113A - Transmission apparatus, reception apparatus, transmission processing method, reception processing method, and program therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmission apparatus for transmitting coded data whereby a receiver side of the coded data can decode the coded data with processing contents adaptive to the processing capability of the receiver side. <P>SOLUTION: The transmission apparatus transmits packet data for a GOP 1 storing coded data of hierarchical data of a lower layer when hierarchically coded. Further, the transmission apparatus 11 transmits packet data for a GOP 2 including error correction unit data of the coded data of the GOP 1 and coded data of hierarchical data of an upper layer. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a transmission device, a reception device, a transmission processing method, a reception processing method, and a program thereof used for transmitting or receiving encoded data via a network.

For example, in recent years, various content data has been provided by video streaming or the like via a network.
Such a network is usually a best-effort method, and video packet data may be treated as a lost packet in the receiving device due to network troubles or the maximum delay time.
In such a system, it is important how to solve the packet loss problem in video streaming and to decode the video data with high quality in the receiving apparatus.

In the conventional method, on the transmission side, each hierarchical data of video data is divided into a plurality of (K) units based on the network state by a method such as FEC (Forward Error Correction), and an error occurs in the plurality of units. A correction code is added to expand to N units.
Here, the set of (N, K) is dynamically determined by the available bandwidth of the network and the packet loss rate.

  Video data subjected to hierarchical encoding such as JPEG (Joint Photographic Coding Experts Group) 2000 is composed of data of a plurality of hierarchical data, and has a characteristic that the influence on the image quality increases as it becomes hierarchical data of the higher hierarchy. Have.

Weiping Li, “Overview of Fine Graularity Scalability in MPEG-4 Video Standard,” IEEE Tran. On Circuits and Systems for Video Technology, Vol. 11, No. 3, March 2001. J. Li, S. Lei, “An Embedded Still Image Coder with Rate-Distortion Optimization.” IEEE TRANSACTION ON IMAGE PROCESSING, Vol. 8, No. 7, July 1999. P. A. Chou, A. E. Mohr, A. Wang, and S. Mehrotra, “Error control for receiver-driven layered multicast of audio and video” IEEE Trans. Multimedia, 3 (1): 108-122, March 2001. R. Puri and K. Ramchandran, “Multiple description source coding through forward error correction codes” In Proc. Asilomar Conference on Signal, Systems, and Computers, Asilomar, CA, Oct. 1999, IEEE. P. A. Chou, H. J. Wang, V. N. Padmanabham, “Layered Multiple description coding”, Packet Video Workshop, Nantes, France, April 2003. Y. Zhu, B. Li, J. Guo, “Multicast with Network coding in Application-Layer Overlay Networks,” IEEE JSAC, vol. 22, No. 1, Jan. 2004. G. Wang, S. Futemma, E. Itakura, “FEC-based Scalable Multiple Description Coding for Overlay Network Streaming”, IEEE CCNC'05, LAS VEGAS, USA, Jan. 2005. P. Ferre, A. Doufexi, A. Nix, D. Bull, and J. Chung-How, “Packetization Strategies for enhanced video transmission over Wireless LANs,” the 14th international Packet Video Workshop in Irvine, USA, Dec. 13- 14, 2004.

By the way, when video data is encoded and distributed, there is a demand for a system in which a decoding device that receives the video data can perform a decoding process suitable for the processing capability of the decoding device.
However, in the above-described conventional system, encoding is performed on the assumption that all hierarchical data is used for decoding at the decoding destination, so it is difficult to answer the above-described request.
The above-mentioned request is not limited to video data, but also applies to various encoded data.

  In order to solve the above-described problems of the prior art, the present invention enables a receiving apparatus for receiving encoded data to decode encoded data with processing contents suitable for the processing capability of the receiving side. An object is to provide a device, a transmission processing method, a reception processing method, and a program thereof.

  In order to solve the above-described problems of the prior art and achieve the above-described object, a transmission device according to a first aspect of the present invention is a transmission device that transmits encoded data that has been hierarchically encoded. First encoding means for generating a plurality of first divided data by dividing and encoding a predetermined number of hierarchical data among the plurality of hierarchical data constituting the data of the data, and the predetermined one of the plurality of hierarchical data Including second encoding means for generating a plurality of second divided data by dividing and encoding hierarchical data other than the number of hierarchical data, and the first divided data generated by the first encoding means Transmission for transmitting to the network first packet data, second packet data including error correction unit data of the first divided data and the second divided data generated by the second encoding means System And a means.

  A receiving apparatus according to a second aspect of the invention is a receiving apparatus that receives encoded data that has been subjected to hierarchical encoding, and includes a plurality of pieces of data generated by dividing and encoding a predetermined number of pieces of hierarchical data among a plurality of hierarchical data. Generated by dividing and encoding first packet data including first divided data, error correction unit data of the first divided data, and hierarchical data other than the predetermined number of hierarchical data among the plurality of hierarchical data Receiving means for receiving the second packet data including the plurality of second divided data, the first packet data received by the receiving means is selected, and the first packet data included in the first packet data is selected. Decoding means for decoding one divided data to generate the predetermined number of hierarchical data.

  A receiving apparatus according to a third aspect of the invention is a receiving apparatus that receives encoded data that has been hierarchically encoded, and includes a plurality of pieces of data generated by dividing and encoding a predetermined number of pieces of hierarchical data among a plurality of pieces of hierarchical data. Generated by dividing and encoding first packet data including first divided data, error correction unit data of the first divided data, and hierarchical data other than the predetermined number of hierarchical data among the plurality of hierarchical data Receiving means for receiving the second packet data including the plurality of second divided data, and the first divided data included in the first packet data received by the receiving means, The second divisional data included in the second packet data is generated by performing error correction with the error correction unit data included in the packet data and then decoding to generate the predetermined number of layer data. Decoding the over data and a decoding means for generating the hierarchical data other than the hierarchical data of the predetermined number.

  A transmission processing method according to a fourth aspect of the present invention is a transmission processing method for transmitting encoded data that has been subjected to hierarchical encoding, and a predetermined number of hierarchical data among a plurality of hierarchical data constituting data to be encoded Dividing and encoding the first divided data to generate a plurality of first divided data, and dividing and encoding hierarchical data other than the predetermined number of hierarchical data among the plurality of hierarchical data A second step of generating divided data, first packet data including the first divided data generated in the first step, error correction unit data of the first divided data, and the second And a third step of sending the second packet data including the second divided data generated in the step to the network.

  A reception processing method according to a fifth aspect of the invention is a reception processing method for receiving hierarchically encoded data, and is generated by dividing and encoding a predetermined number of hierarchical data among a plurality of hierarchical data. Dividing and encoding first packet data including a plurality of first divided data, error correction unit data of the first divided data, and hierarchical data other than the predetermined number of hierarchical data among the plurality of hierarchical data A first step of receiving second packet data including a plurality of second divided data generated in the step, and selecting the first packet data received in the first step; And a second step of decoding the first divided data included in the packet data to generate the predetermined number of hierarchical data.

  A reception processing method according to a sixth aspect of the invention is a reception processing method for receiving hierarchically encoded data, and is generated by dividing and encoding a predetermined number of hierarchical data among a plurality of hierarchical data. Dividing and encoding first packet data including a plurality of first divided data, error correction unit data of the first divided data, and hierarchical data other than the predetermined number of hierarchical data among the plurality of hierarchical data A first step of receiving second packet data including a plurality of second divided data generated in the first step, and first divided data included in the first packet data received in the first step Is decoded after the error correction unit data included in the second packet data is error-corrected to generate the predetermined number of layer data, and before being included in the second packet data. It decodes the second divided data and a second step of generating a hierarchical data other than the hierarchical data of the predetermined number.

  A program according to a seventh aspect of the invention is a program executed by a transmission device that transmits encoded data that has been hierarchically encoded, and a predetermined number of hierarchies among a plurality of hierarchical data that constitute data to be encoded A first procedure for dividing and encoding data to generate a plurality of first divided data; and a plurality of second data by dividing and encoding hierarchical data other than the predetermined number of hierarchical data among the plurality of hierarchical data The second procedure for generating the divided data, the first packet data including the first divided data generated in the first procedure, the error correction unit data of the first divided data, and the second The transmitting apparatus is caused to execute a third procedure for transmitting the second packet data including the second divided data generated by the procedure (2) to the network.

  According to the present invention, a transmission device, a reception device, a transmission processing method, a reception processing method, which enables a reception side of encoded data to decode encoded data with processing contents suitable for the processing capability of the reception side, Those programs can be provided.

Hereinafter, a communication system according to an embodiment of the present invention will be described.
The transmission device 11 is an example of the transmission device of the invention of the first aspect, the low-end reception device 13 is an example of the reception device of the invention of the second aspect, and the high-end reception device 15 is the reception of the invention of the third aspect. It is an example of an apparatus.
The low end unit generator 23 shown in FIG. 2 is an example of the first encoding means of the first aspect of the invention, and the high end unit generator 33 is an example of the second encoding means.
Further, the low-end packetization unit 29 and the high-end packetization unit 39 shown in FIG. 2 are examples of the transmission control means of the first aspect of the invention.
A program RPG shown in FIG. 11 is an example of the program of the present invention.

FIG. 1 is a conceptual diagram of a communication system 1 according to an embodiment of the present invention.
As shown in FIG. 1, in the communication system 1, the transmission device 11 transmits content data CONT to the low-end reception device 13 and the high-end reception device 15 in a packet format.
Communication in the communication system 1 is performed, for example, via a wired or wireless network such as the Internet in which the bandwidth and packet loss rate vary.
Note that the numbers of the low-end receiving device 13 and the high-end receiving device 15 are arbitrary.

<Transmitter 11>
FIG. 2 is a configuration diagram of the transmission apparatus 11 shown in FIG.
As illustrated in FIG. 2, the transmission device 11 includes, for example, a memory 21, a static parameter determination unit 22, a low end unit generation unit 23, a low end buffer memory 25, an interface 26, a network state detection unit 27, and a low end dynamic parameter determination unit. 28, a low-end packetization unit 29, a high-end unit generation unit 33, a high-end buffer memory 35, a high-end dynamic parameter determination unit 38, and a high-end packetization unit 39.
For example, the transmission device 11 transmits the content data to the reception devices 13 and 15 in a streaming format.

[Memory 21]
The memory 21 stores content data CONT to be transmitted.
In the present embodiment, the content data CONT is data that is hierarchically encoded by, for example, JPEG (Joint Photographic Coding Experts Group) 2000 or MPEG (Motion Picture Experts Group) 4-FGS.
In JPEG2000, for example, an encoding apparatus divides a transform coefficient obtained by performing discrete wavelet transform on encoded image data into a plurality of code blocks, and performs bit-plane decomposition on each code block.
Then, the encoding apparatus divides each bit plane into a plurality of encoding passes, and controls the code amount in units of encoding passes.
Also, JPEG2000 defines hierarchical data that is a group of encoded data corresponding to SNR improvement in a reproduced image.
Each hierarchical data has a characteristic that the influence on the image quality of the decoded image is larger than that of the upper hierarchical data, for example.
The encoding apparatus can improve the reproduced image step by step by additionally transmitting the data of the upper layer data to the data of the lower layer data. Also, truncation processing can be performed on data exceeding a given bit rate.

[Static parameter determination unit 22]
The static parameter determination unit 22 is independent of the state of the network 19 (offline), and based on the worst state of the network 19 and the maximum available bit rate that are assumed in advance, the static parameter (n _i , k _i ) To decide.
In the static parameters (n _i , k _i ), “i” indicates the layer data number of the content data CONT.
In the present embodiment, as the hierarchical data number “i” decreases, the influence on the image quality of the decoded image increases.
k _i indicates the number by which the static parameter determination unit 22 divides the hierarchical data Layer _i of transmission data into a plurality of information unit data IU.
N _i is unit data of code unit data obtained by encoding the plurality of information unit data IU constituting the hierarchical data Layer _i of the transmission data and the error correction code unit data in the static parameter determination unit 22 Indicates the total number.
k _i / n _i is, for example, 0.6.
Static parameter determination unit 22 outputs the static parameter k _i to the low-end unit generation unit 23 and the high-end unit generation unit 33.
The static parameter determination unit 22 outputs the static parameter _ni to the low end unit generation unit 23 and the high end unit generation unit 33.
In the present embodiment, the case where the common parameters k _i and _ni are used in the low-end unit generation unit 23 and the high-end unit generation unit 33 is illustrated. However, the static parameter determination unit 22 includes the low-end unit generation unit 23 and the high-end unit generation unit 33. The parameters may be generated individually for each of the unit generation units 33.

[Low-end unit generator 23]
The low end unit generation unit 23 divides the hierarchical data Layer _i (1 ≦ i ≦ L1) constituting the content data CONT read from the memory 21 into a plurality of information units.
For example, as illustrated in FIG. 3, the low-end unit generation unit 23 converts the hierarchical data Layer _i (1 ≦ i ≦ L1) into k _i information units based on the static parameter ki from the static parameter determination unit 22. The data is divided into data U _ki .
Here, low-end unit generation unit 23, _{k i-number} of consecutive symbols in a hierarchical data _{Layer i (1 ≦ i ≦ L1} ) to generate information unit data _{IU ki} as belonging to different information unit data _{IU ki.}
In FIG. 3, each number represents a symbol, and _Bi is the last symbol.

Next, low-end unit generation unit 23, the generated layer data _{Layer i (1 ≦ i ≦ L1} ) of the _{k i} pieces of information unit data _IU i1 _{~IU iki} code unit data _U i1 corresponding to each _{~U ik} i and (n _i −k _i ) pieces of error correction unit data U _{i (ki + 1) to} U _{ini corresponding} thereto are generated. That is, low-end unit generation unit 23 generates the _{n i} pieces of unit data _U i1 _{~U ini.}
The low end unit generation unit 23 writes the unit data U _{i1 to} U _ini of all hierarchical data Layer _i (1 ≦ i ≦ L1) into the low end buffer memory 25 and the high end buffer memory 35.
Here, n _i > k _i .

[Interface 26]
The interface 26 communicates with the low-end receiving device 13 and the high-end receiving device 15 shown in FIG.

[Network status detection unit 27]
The network state detection unit 27 monitors the communication state of the network 19 via the interface 26, and dynamically detects the available bandwidth of the network 19, the packet loss rate, and the like.

[Low-end dynamic parameter determination unit 28]
The low-end dynamic parameter determination unit 28 determines the available bit amount R1 for GOP1 based on the available bandwidth detected by the network state detection unit 27.
The low-end dynamic parameter determination unit 28 calculates the GOP size N1 of GOP1 by dividing the determined available bit amount R1 by a predetermined packet length PL as shown in the following formula (1).
The GOP size N1 indicates the number of packet data used to transmit one GOP1.

[Equation 1]
N1 = R1 / P _L
... (1)

Low-end dynamic parameter determination unit 28, the number, i.e., of the N1 packet data hierarchical data Layer _i (1 ≦ _i ≦ the unit data (information blocks) for each hierarchical data _{Layer i (1 ≦ i ≦ L1} ) K1 _i indicating the number of packet data including unit data of L1) is determined.
That is, the low-end dynamic parameter determination unit 28 sets the set K1 = [K1 ₁ ,. , K1 _i ,. . K1 _L ] is defined, and an optimum set K1 for obtaining D (R) which is the minimum total distortion (Distortion) is searched.
The total strain D (R) is defined as in the following formula (2).

In the above equation (2), P (N1, r) indicates the probability that r packets out of N packets are lost, and R _i is the layer data Layer _i (1 ≦ i ≦ L1). The number of bits at the end is shown.
d (R _i ) indicates the source distortion when the scalable bit stream is truncated at the position of R _i .
In the present embodiment, a distortion model “y = Cx ^1-2γ ” is adopted for ^{simplification} . Here, C is a positive number, γ is on the order of 1, and x indicates a bit rate by a unit bpp (bit per pixel).
The total strain shown in the above equation (2) is subject to the constraint of the following equation (3).

In the above formula _{(3), (R i -R} i-1) / k i indicates the data length of the unit data U of the hierarchical data _{Layer i (1 ≦ i ≦ L1} ).
R _c is a redundant bit.
In the present embodiment, when R _i (i <L) is fixed, the above formula (2) can be expressed by the following formula (4).

From the above equation (4), it can be seen that the total distortion is composed of the source distortion d (R _L ) and the channel distortion dc (R _L ).
The channel distortion dc (R _L ) is an item other than the source distortion d (R _L ) in the above formula (4).

As a result, the low-end dynamic parameter determination unit 28 determines the trade-off between the source distortion and the channel distortion as shown in the following formula (5), thereby obtaining the minimum total distortion D (R). Set K1 = [K1 ₁ ,. . . K1 _L ] is searched.

The low-end dynamic parameter determination unit 28 performs an iterative operation by the Lagrangian algorithm based on the above equation (5), so that the optimum set K1 = [K1 ₁ ,. . . K1 _L ] is generated.
At this time, as shown in FIG. 4, the low-end dynamic parameter determination unit 28 searches the set K1 so that “K1 _i ≦ K1 _j ” when “i <j”.

 The low-end dynamic parameter determination unit 28 outputs the determined set K1 and GOP size N1 as dynamic parameters (N1, K1) to the low-end packetization unit 29 for GOP1.

[Low-end packetization unit 29]
Based on the set K1 and the GOP size N1 input from the low-end dynamic parameter determining unit 28, the low-end packetizing unit 29 is a unit of 1 GOP stored in the low-end buffer memory 25 as shown in FIG. the selected unit data _U i1 _{~U ini} of the data _U i1 _{~U ini,} stored in the N1 packet data Packet1～N1.
At this time, as shown in FIGS. 4 (A) and 5 (A), the low-end packetizing unit 29 includes all hierarchical data units of the hierarchical data Layer 1 to L 1 inside each of the packet data Packets 1 to N 1. Data U _{i1 to} U _ini are stored.

In the present embodiment, the low-end packetization unit 29 stores, for example, all the information unit data IU _{i1 to} IU iki of _1GOP to be processed stored in the low-end buffer memory 25 in the packet data Packets _{1 to} N1.
Further, the low-end packetizing unit 29 includes (N1−K1 _i ) × (k _i / K1 _i ) among the error correction unit data U _{i (ki + 1) to} U _ini stored in the low-end buffer memory 25. ) Worth of error correction unit data is stored in the packet data packets 1 to N1.

As shown in FIG. 4A, the low-end packetization unit 29 stores unit data U _i1 stored in each of the packet data Packets ₁ to N as the hierarchical data Layer _i (1 ≦ i ≦ L1) becomes smaller. ~U as data of _ini increases the same or generates the packet data Packet1～N.

  The low-end packetizing unit 29 transmits the packet data Packets 1 to N1 in the GOP format shown in FIG. 4A from the interface 26 to the low-end receiving device 13 and the high-end receiving device 15 shown in FIG.

[High-end unit generator 33]
The high-end unit generation unit 33 divides hierarchical data Layer _i (L1 + 1 ≦ i ≦ L2) constituting the content data CONT read from the memory 21 into a plurality of information units.
For example, as illustrated in FIG. 3, the high-end unit generation unit 33 converts the hierarchical data Layer _i (L1 + 1 ≦ i ≦ L2) into k _i information units based on the static parameter ki from the static parameter determination unit 22. Data U _ki is generated.
Here, the high-end unit generation unit 33, _{k i-number} of consecutive symbols in a hierarchical data _{Layer i (L1 + 1 ≦ i} ≦ L2) to generate information unit data _{IU ki} as belonging to different information unit data _{IU ki.}
In FIG. 3, each number represents a symbol, and _Bi is the last symbol.

Code Next, a high-end unit generation unit 33, as shown in FIG. 3, corresponding to each of the _{k i} pieces of information unit data _IU i1 _{~IU iki} the generated layer data _{Layer i (1 ≦ i ≦ L1} ) Unit data U _{i1 to} U _iki and (n _i −k _i ) pieces of error correction unit data U _{i (ki + 1) to} U _ini corresponding to the unit data U _{i1 to} U _iki are generated. That is, the high end unit generation unit 33 generates n _i unit data U _{i1 to} U _ini .
Here, ni> ki.
The high-end unit generation unit 33 writes the unit data U _{i1 to} U _ini of all hierarchical data Layer _i (L1 + 1 ≦ i ≦ L2) into the low-end buffer memory 25.

[High-end dynamic parameter determination unit 38]
The high-end dynamic parameter determination unit 38 determines the available bit amount R2 for GOP2 based on the available bandwidth detected by the network state detection unit 27.
High-end dynamic parameter determination unit 38, similarly to the low-end dynamic parameter determination unit 28, the available bit amount R2 in which the determined, calculates the GOP size N2 division to GOP2 at predefined packet length P _L .
The GOP size N2 indicates the number of packet data used to transmit one GOP2.

Further, the high-end dynamic parameter determination unit 38 uses the same method as the low-end dynamic parameter determination unit 28, and the number of unit data (information blocks) for each hierarchical data Layer _i (L1 + 1 ≦ i ≦ L2), that is, N2 Of the packet data, K2i indicating the number of packet data including the unit data of the hierarchical data Layer _i (L1 + 1 ≦ i ≦ L2) is determined.
That is, the high-end dynamic parameter determination unit 38 sets the set K2 = [K2 _{L1 + 1} ,. , K2 _i ,. . K2 _L2 ] is defined, and an optimum set K2 for obtaining D (R) which is the minimum total distortion (Distortion) is searched.
At this time, as shown in FIG. 4, the high-end dynamic parameter determination unit 38 searches the set K2 such that “K2 _i ≦ K2 _j ” when “i <j”.

 The high-end dynamic parameter determination unit 38 outputs the determined set K2 and GOP size N2 as dynamic parameters (N2, K2) to the high-end packetization unit 39 for GOP2.

[High-end packetization unit 39]
Based on the set K2 and the GOP size N2 input from the high-end dynamic parameter determining unit 38, the high-end packetizing unit 39 is a unit for 1 GOP stored in the high-end buffer memory 35 as shown in FIG. the selected unit data _U i1 _{~U ini} of the data _U i1 _{~U ini,} stored in the N2 packet data PacketN1 + 1~N2.
At this time, as shown in FIG. 4B, the high-end packetizing unit 39 includes unit data U _{i1 to U1} of all the hierarchical data Layer _{L1 + 1 to L2} inside each of the packet data Packets N1 + _{1 to N2.} Store _ini .
Further, the high-end packetization unit 39 reads out the error correction unit data of Layers 1 to _L1 from the high-end buffer memory 35, and further stores them in N2 packet data Packets N1 + 1 to N2, as shown in FIG. 4B. Store.

In the present embodiment, the high-end packetization unit 39 stores, for example, all the information unit data IU _{i1 to} IU iki of _1GOP to be processed stored in the high-end buffer memory 35 in the packet data PacketN1 + _{1 to} N2.
Further, the high-end packetization unit 39 includes (N2-K2 _i ) × (k _i / K2 _i ) among the error correction unit data U _{i (ki + 1) to} U _ini stored in the high-end buffer memory 35. ) Worth of error correction unit data is stored in packet data Packets N1 + 1 to N2.

As shown in FIG. 4B, the high-end packetizing unit 39 stores unit data U _i1 stored in each packet data packet N1 + 1 to N2 as _i of the hierarchical data Layer _i (L1 + 1 ≦ i ≦ L2) decreases. as the data amount of ~U _ini increases the same or generates the packet data PacketN1 + 1~N2.

The high-end packetizing unit 39 transmits the packet data Packets N1 + 1 to N2 in the GOP format shown in FIGS. 4B and 5B from the interface 26 through the network 19 to the low-end receiving device 13 and the high-end receiving device shown in FIG. 15 to send.
Here, and FIG. 5 (B) the amount of data NUM _L1 within one packet data error correction unit data of Layer _L1 shown in _'is in one packet data error correction unit data of Layer _L1 in GOP1 shown in FIG. 4 It does not have to match the data amount NUM _L1 .

Hereinafter, an operation example of the transmission apparatus 11 illustrated in FIG. 2 will be described.
6 and 7 are flowcharts for explaining an operation example of the transmission apparatus 11 shown in FIG.
Note that steps ST2a, ST3a, ST6a, ST7a and steps ST2b, ST3b, ST6b, ST7b shown in FIGS. 6 and 7 may be processed in parallel.

Step ST1:
The static parameter determination unit 22 is independent of the state of the network 19 (offline), and based on the worst state of the network 19 and the maximum available bit rate that are assumed in advance, the static parameter (n _i , k _i ) To decide.
The static parameter determination unit 22 outputs the static parameter k _i to the low end unit generation unit 23 and the high end unit generation unit 33.
The static parameter determination unit 22 outputs the static parameter _ni to the low end unit generation unit 23 and the high end unit generation unit 33.

Step ST2a:
The low end unit generation unit 23 divides the hierarchical data Layer _i (1 ≦ i ≦ L1) constituting the content data CONT read from the memory 21 into a plurality of information units.

Step ST2b:
The high-end unit generation unit 33 divides hierarchical data Layer _i (L1 + 1 ≦ i ≦ L2) constituting the content data CONT read from the memory 21 into a plurality of information units.

Step ST3a:
Low-end unit generation unit 23 based on the static parameters _{n i} input from the static parameter determining unit 22 at step ST1, ki pieces of information units of the hierarchical data Layer _i generated in step ST2a (1 ≦ i ≦ L1) expanded by adding an error correction code to data _IU i1 _{~IU iki} (e.g., performs Reed-Solomon coding and LT coding), and generates the _{n i} pieces of unit data _U i1 _{~U ini.}
Low-end unit generation unit 23 writes the _{n i} pieces of unit data _U i1 _{~U ini} the low-end buffer memory 25 and high-end buffer memory 35.

Step ST3b:
High-end unit generation unit 33 based on the static parameters _{n i} input from the static parameter determining unit 22 at step ST1, _{k i} pieces of information of the hierarchical data Layer _i generated in step ST2a (L1 + 1 ≦ i ≦ L2) unit data _IU i1 expanded by adding an error correction code to _{~IU iki} (e.g., performs Reed-Solomon coding and LT coding), and generates the _{n i} pieces of unit data _U i1 _{~U ini.}
High-end unit generation unit 33 writes the _{n i} pieces of unit data _U i1 _{~U ini} high-end buffer memory 35.

Step ST4:
The transmission device 11 is connected to the network 19.
That is, the transmission device 11 generates unit data U _{i1 to} U _ini based on static information about the network 19 before connection to the network 19, and writes this in the buffer 25.
Note that while the transmission device 11 is connected to the network 19, the unit data U _{i1 to} U _ini may be generated based on a static state related to the network 19.

Step ST5:
The network state detection unit 27 monitors the communication state of the network 19 via the interface 26, and dynamically detects the available bandwidth of the network 19, the packet loss rate, and the like.

Step ST6a:
The low-end dynamic parameter determination unit 28 determines the available bit amount R based on the available bandwidth detected by the network state detection unit 27.
Then, the low-end dynamic parameter determination unit 28 calculates the GOP size N1 based on the determined available bit amount R1 by the above equation (1).
Further, the low-end dynamic parameter determination unit 28 sets the set K1 = [K1 ₁ ,. , K1 _i ,. . K1 _L ] is defined, and an optimum set K1 that minimizes the total distortion D (R) shown in Expression (4) is searched.
The low-end dynamic parameter determination unit 28 outputs the searched set K1 and GOP size N1 to the low-end packetization unit 29 as dynamic parameters (N1, K1).

Step ST6b:
The high-end dynamic parameter determination unit 38 determines the available bit amount R based on the available bandwidth detected by the network state detection unit 27.
Then, the high-end dynamic parameter determination unit 38 calculates the GOP size N2 based on the determined available bit amount R2 by the above equation (1).
Further, the high-end dynamic parameter determination unit 38 sets the set K2 = [K2 ₁ ,. , K2 _i ,. . K2 _L ] is defined, and an optimal set K2 that minimizes the total distortion D (R) shown in Expression (4) is searched.
The high-end dynamic parameter determination unit 38 outputs the searched set K2 and GOP size N2 to the high-end packetization unit 39 as dynamic parameters (N2, K2).

Step ST7a:
Based on the set K1 and the GOP size N1 input from the low-end dynamic parameter determination unit 28, the low-end packetizing unit 29, as shown in FIG. 4A, generates hierarchical data Layer1 to Layer1 stored in the low-end buffer memory 25. The unit data U _{i1 to} U _ini selected from the unit data U _{i1 to} U _ini for 1 GOP of L1 are stored in N1 packet data Packets 1 to N1.
Further, the low-end packetizing unit 29 includes (N1−K1 _i ) × (k _i / K1 _i ) among the error correction unit data U _{i (ki + 1) to} U _ini stored in the low-end buffer memory 25. ) Worth of error correction unit data is stored in the packet data packets 1 to N1.
Then, the low-end packetizing unit 29 transmits the packet data Packets 1 to N1 in the GOP1 format shown in FIG. 4A from the interface 26 to the low-end receiving device 13 and the high-end receiving device 15 shown in FIG. .

Step ST7b:
Based on the set K2 and the GOP size N2 input from the high-end dynamic parameter determination unit 38, the high-end packetization unit 39, as shown in FIG. 4B, the hierarchical data Layer _{L1 + 1} stored in the high-end buffer memory 35. the selected unit data _U i1 _{~U ini} of unit data _U i1 _{~U ini} of 1GOP fraction of _～L2, stored in the N1 packet data PacketN1 + 1~N2.
Furthermore, high-end packetizing unit 39, an error correction unit of 1GOP to be processed, which is stored in the high-end buffer memory 35 data _{U i (ki} + _{1) ~U} of _{ini, (N2-K2i) ×} (k i / K2 i) Are stored in the packet data PacketN1 + 1 to N2.
Further, the high-end packetization unit 39 reads out the error correction unit data of Layers 1 to _L1 from the high-end buffer memory 35, and further stores them in N2 packet data Packets N1 + 1 to N2, as shown in FIG. 4B. Store.
Then, the high-end packetizing unit 39 transmits packet data Packets N1 + 1 to N2 in the GOP2 format shown in FIG. 4B from the interface 26 to the low-end receiving device 13 and the high-end receiving device 15 shown in FIG. .

  The transmission device 11 transmits the static parameters and dynamic parameters described above included in the header data of GOP1 and GOP2.

<Low-end receiver 13>
FIG. 8 is a block diagram of the low-end receiving device 13 shown in FIG.
As shown in FIG. 8, the low-end receiving device 13 includes, for example, an interface 51, a control data extracting unit 52, a network state detecting unit 53, a low-end depacketizing unit 54, a low-end buffer memory 55, a low-end channel decoder 56, and a decoder 57. Have.

  The interface 51 receives the packet data packets 1 to N1 of GOP1 shown in FIG. 4A and the packet data packets N1 + 1 to N2 of GOP2 shown in FIG. Of these, packet data packets 1 to N1 of GOP1 are output to the low-end depacketization unit 54.

The control data extraction unit 52 extracts the static parameters (n _i , k _i ) from the GOP 1 received by the interface 51, and outputs them to the low end channel decoder 56.
Further, the control data extraction unit 52 extracts the dynamic parameters (N1, K1 _i ) from GOP1 received by the interface 51, and outputs this to the low-end depacketization unit 54.

  The network state detection unit 53 detects the network state based on the depacket state of the low-end depacketization unit 54 and transmits the detection result to the transmission device 11 via the interface 51.

Based on the dynamic parameters (N1, K1 _i ) input from the control data extraction unit 52, the low-end depacketization unit 54 extracts the code unit data U _{i1 to} U _ini from the packet data packets 1 to N1 of the GOP1. Is written into the low-end buffer memory 55.

The low-end channel decoder 56 performs error correction processing (channel decoding processing) on the unit data U _{i1 to} U _ini read from the low-end buffer memory 55 based on the static parameters (n _i , k _i ) input from the control data extraction unit 52. ) Is performed for each hierarchical data Layer _i (1 ≦ i ≦ L1).

The decoder 57 decodes (decodes) the data error-corrected by the low-end channel decoder 56 for each layer data Layer _i (1 ≦ i ≦ L1).

Hereinafter, an operation example of the low-end receiving device 13 illustrated in FIG. 8 will be described.
First, the interface 51 transmits the packet data packets 1 to N1 of GOP1 shown in FIG. 4A and the packet data packets N1 + 1 to N2 of GOP2 shown in FIG. Receive.
Then, the interface 51 outputs the packet data packets 1 to N1 of GOP1 to the low-end depacketization unit 54.

Next, the control data extraction unit 52 extracts the static parameters (n _i , k _i ) from GOP 1 received by the interface 51, and outputs them to the low end channel decoder 56.
Further, the control data extraction unit 52 extracts the dynamic parameters (N1, K1 _i ) from the GOP1 received by the interface 51, and outputs this to the low-end depacketization unit 54.

Next, the low-end depacketizing unit 54 extracts unit data U _{i1 to} U _ini from the packet data packets 1 to N1 of GOP1 based on the dynamic parameters (N1, K1 _i ) input from the control data extracting unit 52. This is written into the low end buffer memory 55.
Next, the low-end channel decoder 56 performs error correction processing of the unit data U _{i1 to} U _ini read from the low-end buffer memory 55 based on the static parameters (n _i , k _i ) input from the control data extraction unit 52. , For each hierarchical data Layer _i (1 ≦ i ≦ L1).
Next, the decoder 57 decodes (decodes) the error-corrected data for each layer data Layer _i (1 ≦ i ≦ L1).

<High-end receiver 15>
FIG. 9 is a block diagram of the high-end receiving device 15 shown in FIG.
As shown in FIG. 9, the high-end receiver 15 includes, for example, an interface 61, a control data extraction unit 62, a network state detection unit 63, a low-end depacketization unit 64, a low-end buffer memory 65, a low-end channel decoder 66, a high-end depacket. And a high-end buffer memory 75, a high-end channel decoder 76, and a decoder 77.

  The interface 61 receives the packet data packets 1 to N1 of GOP1 shown in FIG. 4A and the packet data packets N1 + 1 to N2 of GOP2 shown in FIG. Among them, the packet data Packets 1 to N1 of GOP1 are output to the low-end depacketization unit 64, and the packet data Packets N1 + 1 to N2 of GOP2 are output to the high-end depacketization unit 74.

The control data extraction unit 62 extracts static parameters (n _i , k _i ) from GOP 1 received by the interface 61, and outputs them to the low end channel decoder 56 and the high end channel decoder 76.
Further, the control data extraction unit 62 extracts the dynamic parameters (N1, K1 _i ) from the GOP1 received by the interface 61 and outputs the dynamic parameters (N1, K1 _i ) to the low-end depacketization unit 64.
Further, the control data extraction unit 62 extracts the dynamic parameters (N2, K2 _i ) from the GOP2 received by the interface 61 and outputs the dynamic parameters (N2, K2 _i ) to the high-end depacketization unit 74.

  The network state detection unit 63 detects the network state based on the depacket states of the low-end depacketization unit 64 and the high-end depacketization unit 74 and transmits the detection result to the transmission device 11 via the interface 61.

Based on the dynamic parameters (N1, K1 _i ) input from the control data extraction unit 62, the low-end depacketization unit 64 extracts the unit data U _{i1 to} U _ini from the packet data packets 1 to N1 of the GOP1. Write to the low end buffer memory 65.

The low-end channel decoder 66 performs error correction processing (channel decoding processing) on the unit data U _{i1 to} U _ini read from the low-end buffer memory 65 based on the static parameters (n _i , k _i ) input from the control data extraction unit 62. ) Is performed for each hierarchical data Layer _i (1 ≦ i ≦ L1).
At this time, the low-end channel decoder 66 performs GOP1 error correction processing based on the error correction unit data stored in GOP2.

Based on the dynamic parameters (N2, K2 _i ) input from the control data extraction unit 62, the high-end depacketization unit 74 extracts unit data U _{i1 to} U _ini from the packet data PacketN1 + 1 to N2 of GOP1, Write to the low end buffer memory 65 and the high end buffer memory 75.

The high-end channel decoder 76 performs error correction processing (channel decoding processing) on the unit data U _{i1 to} U _ini read from the high-end buffer memory 75 based on the static parameters (n _i , k _i ) input from the control data extraction unit 62. ) Is performed for each hierarchical data Layer _i (L1 + 1 ≦ i ≦ L2).

The decoder 77 decodes (decodes) the data error-corrected by the low-end channel decoder 66 and the high-end channel decoder 76 for each layer data Layer _i (1 ≦ i ≦ L2).

Hereinafter, an operation example of the high-end receiving device 15 illustrated in FIG. 9 will be described.
The interface 61 receives the packet data packets 1 to N1 of GOP1 shown in FIG. 4A and the packet data packets N1 + 1 to N2 of GOP2 shown in FIG. To do.
Then, the interface 61 outputs the received GOP1 packet data Packets 1 to N1 to the low-end depacketizing unit 64, and outputs GOP2 packet data Packets N1 + 1 to N2 to the high-end depacketizing unit 74.

Next, the control data extraction unit 62 extracts the static parameters (n _i , k _i ) from the GOP 1 received by the interface 61, and outputs them to the low end channel decoder 66 and the high end channel decoder 76.
Further, the control data extraction unit 62 extracts the dynamic parameters (N1, K1 _i ) from the GOP1 received by the interface 61 and outputs the dynamic parameters (N1, K1 _i ) to the low-end depacketization unit 64.
Further, the control data extraction unit 62 extracts the dynamic parameters (N2, K2 _i ) from the GOP2 received by the interface 61 and outputs the dynamic parameters (N2, K2 _i ) to the high-end depacketization unit 74.

Next, based on the dynamic parameters (N1, K1 _i ) input from the control data extraction unit 62 by the low-end depacketization unit 64, unit data U _{i1 to} U _ini are extracted from the packet data packets 1 to N1 of GOP1. This is written into the low end buffer memory 65.
Next, the low-end channel decoder 66 corrects the unit data U _{i1 to} U _ini read from the low-end buffer memory 65 based on the static parameters (n _i , k _i ) input from the control data extraction unit 62 ( Channel decoding processing) is performed for each hierarchical data Layeri (1 ≦ i ≦ L1).
At this time, the low-end channel decoder 66 performs GOP1 error correction processing based on the error correction unit data stored in GOP2.

In parallel with the processing of the low-end depacketization unit 64 and the low-end channel decoder 66 described above, the high-end depacketization unit 74 is based on the dynamic parameters (N2, K2 _i ) input from the control data extraction unit 62. , Unit data U _{i1 to} U _ini are extracted from packet data Packets N1 + 1 to N2 of GOP1 and written into the low-end buffer memory 65 and the high-end buffer memory 75, respectively.
Further, the high-end channel decoder 76 performs error correction processing (channels) of the unit data U _{i1 to} U _ini read from the high-end buffer memory 75 based on the static parameters (n _i , k _i ) input from the control data extraction unit 62. (Decoding process) is performed for each layer data Layer _i (L1 + 1 ≦ i ≦ L2).

Next, the decoder 67 decodes (decodes) the data error-corrected by the low-end channel decoder 66 and the high-end channel decoder 76 for each layer data Layer _i (1 ≦ i ≦ L2).

As described above, according to the communication system 1, the transmission apparatus 11 generates GOP1 packet data Packets 1 to N1 and GOP2 packet data N1 + 1 to N2 and sends them to the network 19.
Here, GOP1 is hierarchical data that has a large influence on the image quality of the decoded image, and the low-end receiving device 13 can generate a decoded image that is good to some extent, but not the highest image quality, by decoding only GOP1.
On the other hand, the high-end receiving device 15 performs error correction of the packet data 1 to N1 of GOP1 based on the error correction unit data in GOP2, and further higher layer data in addition to the layer data included in GOP1 By decoding the packet data for the target, it is possible to generate a decoded image with higher image quality than the low-end receiving device 13.
Here, the data processing amount of the low-end receiving device 13 can be significantly reduced as compared with the high-end receiving device 15, and a system corresponding to a plurality of receiving devices having different processing capabilities can be provided.

In addition, as described above, in the transmission device 11, the unit parameter U _i1 to the unit data U _i1 to the unit 19 based on the static information of the network 19 in advance using the static parameter determination unit 22, the low-end unit generation unit 23, and the high-end unit generation unit 33. U _ini is generated and stored in the low-end buffer memory 25 and the high-end buffer memory 35.
Then, the network state detection unit 27 dynamically detects the state of the network 19, and based on the result, the low-end dynamic parameter determination unit 28 and the high-end dynamic parameter determination unit 38 determine the dynamic parameters (N1, K1i). , (N2, K2 _i ).
The low-end packetizing unit 29 reads unit data U _{i1 to} U _ini of the hierarchical data Layer _i (1 ≦ i ≦ L1) from the low-end buffer memory 25 based on the dynamic parameters (N1, K1 _i ), Based on this, packet data Packets 1 to N1 shown in FIG. 4A are generated and transmitted.
Further, the high-end packetization unit 39 reads the unit data U _{i1 to} U _ini of the hierarchical data Layeri (L1 + 1 ≦ i ≦ L2) from the high-end buffer memory 35 based on the dynamic parameters (N2, K2i), Based on this, packet data Packets N1 + 1 to N2 shown in FIG. 4B are generated and transmitted.
Thus, according to the transmission apparatus 11, even if the state of the network 19 changes, only the combination pattern of the unit data U _{i1 to} U _ini is changed, and no new unit data U _{i1 to} U _ini is generated. Therefore, when the state of the network 19 fluctuates, the amount of computation required by the transmission device 11 can be significantly reduced compared to the conventional case, and real-time transmission of content data can be realized with a small-scale and low-cost device configuration.

FIG. 10 is a diagram for explaining an example of the structure of GOP1 and GOP2 shown in FIG. 4 when the hierarchical data has two levels. In this way, NUM ₂ is 4 when the hierarchy data is 2 hierarchies.
In this example, if 4 packet data out of 6 packet data can be received, the receiving side can decode all the two layer data by error correction.

The present invention is not limited to the embodiment described above.
That is, those skilled in the art may make various modifications, combinations, subcombinations, and alternatives regarding the components of the above-described embodiments within the technical scope of the present invention or an equivalent scope thereof.
In the above-described embodiment, the low-end dynamic parameter determination unit 28 and the high-end dynamic parameter determination unit 38 determine the available bit amount R from the available bandwidth and determine the GOP size N from the available bit amount R. However, the GOP sizes N1 and N2 and the sets K1 and K2 may be determined based on the packet loss rate detected by the network state detection unit 27.

In the above-described embodiment, the case where a plurality of hierarchical data is stored in 2 GOPs is exemplified.
In this case, for example, error correction unit data of GOP2 is included in the third GOP3.

  In the above-described embodiment, image data is exemplified as transmission target data. However, audio data may be used.

For example, all or part of the functions of any one of the transmission device 11, the low-end reception device 13, and the high-end reception device 15 described above may be realized in a form in which the processing circuit executes a program.
For example, as shown in FIG. 11, the interface 51, the memory 52, and the processing circuit 53 may be connected by a data line 50 to configure any one of the transmission device 11, the low-end reception device 13, and the high-end reception device 15.
In this case, the transmission device 11, the low-end reception device 13, and the low-end reception device 13 read and execute the program PRG from the memory 52, and realize the function (processing) described in the above-described embodiment.

FIG. 1 is an overall configuration diagram of a communication system according to a first embodiment of this invention. FIG. 2 is a block diagram of the transmission apparatus in FIG. FIG. 3 is a diagram for explaining the functions of the low-end unit generator and the high-end unit generator shown in FIG. FIG. 4 is a diagram for explaining packet data of GOP1 and GOP2 generated by the transmission apparatus shown in FIG. FIG. 5 is a diagram for explaining packet data of GOP1 and GOP2 generated by the transmission apparatus shown in FIG. FIG. 6 is a flowchart for explaining an operation example of the transmission apparatus shown in FIG. FIG. 7 is a continuation flowchart of FIG. 6 for explaining an operation example of the transmission apparatus shown in FIG. FIG. 8 is a block diagram of the low-end receiving apparatus shown in FIG. FIG. 9 is a block diagram of the high-end receiving apparatus shown in FIG. FIG. 10 is a diagram for explaining the configuration of GOPs 1 and 2 shown when performing two-layer encoding. FIG. 11 is a diagram for explaining a modification of the transmission device, the low-end reception device, and the high-end reception device shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Transmitter, 13 ... Low end receiver, 15 ... High end receiver, 21 ... Memory, 22 ... Static parameter determination part, 23 ... Low end unit production | generation part, 25 ... Low end buffer memory, 27 ... Network state detection part, 28 ... low-end dynamic parameter determination unit, 29 ... low-end packetization unit, 33 ... high-end unit generation unit, 35 ... high-end buffer memory, 38 ... high-end dynamic parameter determination unit, 39 ... high-end packetization unit, 51 ... interface, 52 ... Control data extraction unit 53... Network state detection unit 54. Low end depacketization unit 55. Low end buffer memory 57 57 Decoder 61. Interface 62 62 Control data extraction unit 63 Network state detection unit 64. Low-end depacket 65: Low end buffer memory, 66 ... Low end channel decoder, 74 ... High end depacketization unit, 75 ... High end buffer memory, 76 ... High end channel decoder, CONT ... Content data, IUi1-IUiki ... Information unit data, Ui1-Uini ... Unit data, Packet1 to N ... Packet data

Claims (14)

A transmission device for transmitting hierarchically encoded data,
First encoding means for generating a plurality of first divided data by dividing and encoding a predetermined number of hierarchical data among a plurality of hierarchical data constituting the encoding target data;
Second encoding means for dividing and encoding hierarchical data other than the predetermined number of hierarchical data among the plurality of hierarchical data to generate a plurality of second divided data;
The first packet data including the first divided data generated by the first encoding means, the error correction unit data of the first divided data, and the second data generated by the second encoding means. A transmission control unit that transmits second packet data including the divided data to a network. The first encoding unit generates and generates a plurality of first divided data by dividing and encoding a predetermined number of hierarchical data from the plurality of hierarchical data having a large influence on the quality of decoded data. Item 2. The transmission device according to Item 1. The transmission control means includes
Storing at least one of the first divided data obtained for all of the predetermined number of hierarchical data in the first packet data;
The at least one said error correction unit data and at least one said 2nd division data obtained about all the hierarchy data other than said predetermined number are stored in said 2nd packet data. Transmitter. The first encoding unit and the second encoding unit generate the first divided data and the second divided data before obtaining network state data indicating the state of the network,
The transmission device according to claim 1, wherein the transmission control unit generates the first packet data and the second packet data based on the network state data after acquiring the network state data. The first encoding means generates the error correction unit data;
The transmission device according to claim 1, wherein the transmission control unit generates the second packet data including the error correction unit data generated by the first encoding unit. The first encoding unit and the second encoding unit respectively generate the first divided data and the second divided data based on a worst communication state assumed in advance for the network. The transmission device according to 1. Detecting means for detecting at least one of an available bandwidth and a packet loss rate of the network;
The transmission control unit generates the first packet data and the second packet data by using at least one of an available bandwidth and a packet loss rate detected by the detection unit as the network state data. 4. The transmission device according to 3. The transmission control means includes
Generating and sending the first packet data including error correction unit data of the first divided data;
The transmission apparatus according to claim 1, wherein the second packet data including error correction unit data of the second divided data is generated and transmitted. A receiving device for receiving hierarchically encoded data,
First packet data including a plurality of first divided data generated by dividing and encoding a predetermined number of hierarchical data among a plurality of hierarchical data, error correction unit data of the first divided data, and the plurality Receiving means for receiving second packet data including a plurality of second divided data generated by dividing and encoding hierarchical data other than the predetermined number of hierarchical data of the hierarchical data;
A receiving device comprising: decoding means for selecting the first packet data received by the receiving means and decoding the first divided data included in the first packet data to generate the predetermined number of hierarchical data. A receiving device for receiving hierarchically encoded data,
First packet data including a plurality of first divided data generated by dividing and encoding a predetermined number of hierarchical data among a plurality of hierarchical data, error correction unit data of the first divided data, and the plurality Receiving means for receiving second packet data including a plurality of second divided data generated by dividing and encoding hierarchical data other than the predetermined number of hierarchical data of the hierarchical data;
The first divided data included in the first packet data received by the receiving means is error-corrected with the error correction unit data included in the second packet data, and then decoded to decode the predetermined number of layer data And a decoding unit configured to generate and decode hierarchical data other than the predetermined number of hierarchical data by decoding the second divided data included in the second packet data. A transmission processing method for transmitting hierarchically encoded data, comprising:
A first step of generating a plurality of first divided data by dividing and encoding a predetermined number of hierarchical data among a plurality of hierarchical data constituting the data to be encoded;
A second step of dividing and encoding hierarchical data other than the predetermined number of hierarchical data among the plurality of hierarchical data to generate a plurality of second divided data;
First packet data including the first divided data generated in the first step, error correction unit data of the first divided data, and the second divided data generated in the second step; And a third step of transmitting the second packet data including: to the network. A reception processing method for receiving hierarchically encoded data, comprising:
First packet data including a plurality of first divided data generated by dividing and encoding a predetermined number of hierarchical data among a plurality of hierarchical data, error correction unit data of the first divided data, and the plurality A first step of receiving second packet data including a plurality of second divided data generated by dividing and encoding hierarchical data other than the predetermined number of hierarchical data of the hierarchical data;
Selecting the first packet data received in the first step, decoding the first divided data included in the first packet data, and generating the predetermined number of hierarchical data; A reception processing method. A reception processing method for receiving hierarchically encoded data, comprising:
First packet data including a plurality of first divided data generated by dividing and encoding a predetermined number of hierarchical data among a plurality of hierarchical data, error correction unit data of the first divided data, and the plurality A first step of receiving second packet data including a plurality of second divided data generated by dividing and encoding hierarchical data other than the predetermined number of hierarchical data of the hierarchical data;
The first divided data included in the first packet data received in the first step is error-corrected with the error correction unit data included in the second packet data and then decoded and the predetermined number of layers And a second step of generating data and generating hierarchical data other than the predetermined number of hierarchical data by decoding the second divided data included in the second packet data. A program executed by a transmission device that transmits hierarchically encoded data,
A first procedure for dividing and encoding a predetermined number of hierarchical data among a plurality of hierarchical data constituting data to be encoded to generate a plurality of first divided data;
A second procedure for dividing and encoding hierarchical data other than the predetermined number of hierarchical data among the plurality of hierarchical data to generate a plurality of second divided data;
First packet data including the first divided data generated in the first procedure, error correction unit data of the first divided data, and the second divided data generated in the second procedure; A program for causing the transmitting apparatus to execute a third procedure for transmitting second packet data including the data to the network.

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