Moving picture data code conversion/transmission method and device, code conversion/reception method and device

• US 7,957,465 B2
• Filed: 04/28/2003
• Issued: 06/07/2011
• Est. Priority Date: 04/26/2002
• Status: Expired due to Fees

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Ozawa, Kazunori, Dei, Hiroaki, Hatabu, Atsushi
• Primary Examiner(s): Harold; Marsha D Banks
• Assistant Examiner(s): Prince; Jessica
• Application Number:
  US10/512,458
• Publication Number:
  US 20050226325A1
• Time in Patent Office: 2,962 Days
• Field of Search: 375/240.12, 375/1, 375/25
• US Class Current: 375/240.12
• CPC Class Codes: H04N 19/40 using video transcoding, i.e. partial or full decoding of a coded input stream followed by re-encoding of the decoded output stream
• CPC Class Codes: H04N 19/61 in combination with predictive coding
• CPC Class Codes: H04N 19/895 in combination with error concealment

Abstract

A code conversion/transmission apparatus for being supplied with compressed encoded data and converting and outputting the data to a transmission path has code converter/transmitters for outputting the encoded data input thereto and encoded data produced by re-encoding the encoded data input thereto, or outputting a plurality of encoded data comprising encoded data produced by separately re-encoding the encoded data input thereto, respectively, and transmitting the plurality of encoded data to at least one transmission path. At least a portion of the encoded data input thereto and at least a portion of the re-encoded encoded data are transmitted to the transmission path.

Claims

1. A code conversion and transmission apparatus for moving picture data, comprising:

(a) first moving picture code converting and transmitting means for being supplied with compressed encoded data input thereto and outputting at least one frame of the input encoded data;

(b) second to N^th moving picture code converting and transmitting means, where N is an integer of 2 or more, for decoding at least a portion of the input encoded data, encoding the data obtained by the decoding, and outputting at least one frame of the encoded data thus obtained;

(c) means for sending at least one of outputs from said first to N^th moving picture code converting and transmitting means to first to M^th transmission paths, where M is an integer of 1 or more, and

(d) means for controlling outputs of said second to N^th moving picture code converting and transmitting means and an output of said first moving picture code converting and transmitting means so as to be outputted with time differences, or outputted to each of said first to N^th moving picture code converting and transmitting means with time differences.

2. The code conversion and transmission apparatus according to claim 1 wherein at least one of said first to N^th moving picture code converting and transmitting means selects at least one frame according to the nature of moving pictures or predetermined rules.

3. The code conversion and transmission apparatus according to claim 1, wherein, when said second to N^th moving picture code converting and transmitting means decode said input encoded data and encode the data obtained by the decoding, said second to N^th moving picture code converting and transmitting means compress the data at a compression ratio equal to or higher than the compression ratio of said input encoded data.

4. The code conversion and transmission apparatus according to claim 1, wherein the time differences for the outputs of said first to N^th moving picture code converting and transmitting means are established according to the state of at least one of the transmission paths and predetermined rules.

5. The code conversion and transmission apparatus according to claim 1, comprising means for selecting compression ratios of said first to N^th moving picture code converting and transmitting means and/or the number of encoded data to be transmitted depending on bands that can be used by said first to M^th transmission paths, and sending the data to said first to M^th transmission paths.

6. The code conversion and transmission apparatus according to claim 1, comprising:

first to M^th code conversion and transmission processors each having said first to N^th moving picture code converting and transmitting means,

wherein outputs of said first to M^th code conversion and transmission processors are sent respectively to said first to M^th transmission paths.

9. The code conversion and transmission apparatus according to claim 1, comprising:

moving picture decoding means for decoding and outputting said input encoded data, said moving picture decoding means being shared by a plurality of moving picture code converting and transmitting means of said first to N^th moving picture code converting and transmitting means;

wherein said plurality of moving picture code converting and transmitting means encode decoded data output from said moving picture decoding means upon the encoding of encoded data.

12. A code conversion and transmission system for moving picture data, comprising:

an encoding apparatus for outputting encoded data;

a code conversion and transmission apparatus according to claim 1;

a plurality of code conversion/reception apparatus; and

a plurality of decoding apparatus;

wherein the encoded data from said encoding apparatus are input to said code conversion and transmission apparatus for moving picture data;

said plurality of code conversion/reception apparatus are supplied with the output from said code conversion and transmission apparatus for moving picture data;

said plurality of decoding apparatus are supplied with and decode encoded data from said plurality of code conversion/reception apparatus for moving picture data; and

said plurality of code conversion/reception apparatus comprise;

selecting means for selecting a transmission path for receiving encoded data from first to M^th transmission paths where M is an integer of 1 or more; and

means for receiving encoded data from the transmission path selected by said selecting means, extracting encoded data which are received free of transmission errors and losses, and reconstructing encoded data based on the extracted encoded data and outputting the reconstructed encoded data.

13. The code conversion and transmission system according to claim 12, wherein said code conversion and transmission apparatus for moving picture data transmits the encoded data to said plurality of code conversion/reception apparatus for moving picture data in response to control signals respectively from said plurality of code conversion/reception apparatus for moving picture data.

22. The code conversion and transmission system according to claim 12, further comprising means for selecting one of encoded data in the same frame which is received from said selected transmission path based on at least one of a compression ratio and image quality.

7. A code conversion and transmission apparatus for moving picture data, comprising:

(a) first moving picture code converting and transmitting means for being supplied with compressed encoded data input thereto and outputting at least one frame of the input encoded data;

(b) second to the N^th moving picture code converting and transmitting means, where N is an integer of 2 or more, for decoding at least a portion of the input encoded data, encoding the data obtained by the decoding, and outputting at least one frame of the encoded data thus obtained;

(c) means for sending at least one of outputs from said first to the N^th moving picture code converting and transmitting means to the first M^th transmission paths, where M is an integer of 1 or more,

(d) first to M^th code conversion and transmission processors each having said first to N^th moving picture code converting and transmitting means; and

(e) means for multiplexing and outputting first to N^th encoded data outputs of said first to N^th moving picture code converting and transmitting means of said first to M^th code conversion and transmission processors, with time differences;

wherein multiplexed outputs of said first to M^th code conversion and transmission processors are sent respectively to said first to M^th transmission paths.

8. The code conversion and transmission apparatus according to claim 7, wherein the time differences set for the outputs of said first to N^th moving picture code converting and transmitting means are multiplexed are according to the state of at least one of the transmission paths and predetermined rules.

10. A code conversion and transmission system for moving picture data, comprising:

a code conversion and transmission apparatus; and

a code conversion/reception apparatus,

wherein said code conversion and transmission apparatus comprises;

(a) first moving picture code converting and transmitting means for being supplied with compressed encoded data input thereto and outputting at least one frame of the input encoded data;

(b) second to the N^th moving picture code converting and transmitting means, where N is an integer of 2 or more, for decoding at least a portion of the input encoded data, encoding the data obtained by decoding, and outputting at least one frame of the encoded data thus obtained;

(c) means for sending at least one of outputs from said first to the Nth moving picture code converting and transmitting means to first to M^th transmission paths, where M is a n integer of 1 or more, and

(d) means for controlling delays, multiplexing the data, and outputting the multiplexed data such that the outputs of said first to N^th moving picture code converting and transmitting means of said code apparatus for moving picture data are transmitted with time differences,

wherein said code conversion/reception apparatus comprises;

selecting means for selecting a transmission path for receiving encoded data from first to M^th transmission paths where M is an integer of 1 or more; and

means for receiving encoded data from the transmission path selected by said selecting means, extracting encoded data which are received free of transmission errors and losses, and reconstructing encoded data based on the extracted encoded data and outputting the reconstructed encoded data, and

wherein the multiplexed data are transmitted to the transmission paths.

11. The code conversion and transmission system according to claim 10 wherein said time differences for the outputs of said first to N^th moving picture code converting and transmitting means of said code conversion and transmission apparatus for moving picture data are established according to the state of at least one of the transmission paths and predetermined rules.

21. The code conversion and transmission system according to claim 10, wherein said code conversion/reception apparatus further comprises means for selecting one of encoded data in the same frame which is received from said selected transmission path based on at least one of a compression ratio and image quality.

14. A code conversion and transmission method for moving picture data, which is carried out by a code conversion and transmission apparatus having first to N^th moving picture code converting and transmitting means, where N is an integer of 2 or more, comprising the steps of:

(a) causing said first moving picture code converting and transmitting means to be supplied with compressed encoded data input thereto and output at least one frame of the input encoded data;

(b) causing said second to N^th moving picture code converting and transmitting means to encode data produced by decoding at least a portion of the input encoded data, and output at least one frame of the encoded data thus obtained; and

(c) sending at least one of outputs from said first to N^th moving picture code converting and transmitting means to first to M^th transmission paths,

where M is an integer of 1 or more,

wherein outputs of said second to N^th moving picture code converting and transmitting means in said step (b) and an output in said step (a) are outputted with time differences, and/or respective outputs in said step (b) are outputted with time differences.

15. The code conversion and transmission method according to claim 14, wherein at least one frame is selected according to the nature of moving pictures or predetermined rules.

16. The code conversion and transmission method according to claim 14, wherein in said step (b), when said second to N^th moving picture code means decode said input encoded data and encode the data obtained by the decoding, said second to N^th moving picture code converting and transmitting means compress the data at a compression ratio equal to or higher than the compression ratio of said input encoded data.

17. The code conversion and transmission method according to claim 14, wherein the time differences for the outputs of said moving picture code converting and transmitting means are established according to the state of at least one of the transmission paths and predetermined rules.

18. The code conversion and transmission method according to claim 14, wherein compression ratios of said first to N^th moving picture code converting and transmitting means and/or the number of encoded data to be transmitted is selected depending on bands that can be used by said first to M^th transmission paths, and the data are sent to said first to M^th transmission paths.

19. The code conversion and transmission method according to claim 14, wherein a plurality of moving picture code converting and transmitting means for encoding data produced by decoding moving picture data, of said first to N^th moving picture code converting and transmitting means, are supplied with data which is obtained by decoding in common moving picture decoding means.

20. A code transmission method for moving picture data, comprising the step of receiving encoded data transmitted by a code conversion and transmission method according to claim 14, and a code conversion/reception method comprising the steps of:

selecting at least one transmission path from M transmission paths where M is an integer of 1 or more; and

receiving encoded data from the selected transmission path, extracting encoded data which are received free of transmission errors and losses, and reconstructing encoded data based on the extracted encoded data and outputting the reconstructed encoded data.

23. The code transmission method according to claim 20, wherein if a plurality of encoded data in the same frame are received, one of the encoded data is selected based on at least one of a compression ratio and image quality.

24. The code transmission method according to claim 20, for enabling a computer to function as moving picture decoding means, shared by a plurality of moving picture code converting and transmitting means for encoding data produced by encoding moving picture data, of said first to N^th moving picture code converting/transmitting means, for decoding moving picture data input thereto and supplying the decoded data to said plurality of moving picture code converting and transmitting means.