Wireless video transmission system

• US 9,544,602 B2
• Filed: 06/30/2006
• Issued: 01/10/2017
• Est. Priority Date: 12/30/2005
• Status: Expired due to Fees

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Laboratories of America Incorporated (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Demircin, Mehmet Umut, van Beek, Petrus J. L.
• Primary Examiner(s): SENFI, BEHROOZ M
• Application Number:
  US11/479,077
• Publication Number:
  US 20070153916A1
• Time in Patent Office: 3,847 Days
• Field of Search: 348/387, 348/385, 348/386, 348/388, 348/411, 348/412, 348/413, 348/414, 375/240, 375/240.01, 375/240.03, 375/240.26, 375/240.24, 375/240.12, 375/240.17, 375/240.28
• US Class Current: 1/1
• CPC Class Codes: H04N 19/124 Quantisation
• CPC Class Codes: H04N 19/146 Data rate or code amount at the encoder output
• CPC Class Codes: H04N 19/177 the unit being a group of pictures [GOP]
• 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 21/2365 Multiplexing of several video streams
• CPC Class Codes: H04N 21/23805 Controlling the feeding rate to the network, e.g. by controlling the video pump
• CPC Class Codes: H04N 21/4347 Demultiplexing of several video streams

Abstract

A transmission systems suitable for video.

Claims

1. A method for transmitting video content comprising:

(a) encoding a plurality of frames of said video by a sender at a data rate;

(b) transmitting said encoded video across a network interconnection to a receiver;

(c) wherein said encoding includes allocating bits for a plurality of frames of said video based upon;

(i) a delay constraint used to allocate a first quantity of bits to an upcoming block of video, the delay constraint estimating a waiting time for the first frame of the upcoming block to be sent to the receiver; and

(ii) a rate distortion model used to further allocate the bits within the first quantity to individual frames within the upcoming block, and which models the change in distortion in at least one first frame as a mathematically linear function of a change in bits allocated to encode only an identified second individual frame.

2. The method of claim 1 wherein said rate distortion model comprises Δ

D_j(x_j)=a_jx_j+b_j, where Δ

D_j is a change in distortion in at least one frame, x_j measures a reduction in bits allocated to frame j and a_i and b_j represent constants.

3. The method of claim 2 where x_j is expressed as a bit rate reduction ratio.

4. The method of claim 3 wherein said model is based upon I, P, and B frames.

5. The method of claim 3 wherein said allocation is based upon a sequential set of frames.

6. The method of claim 3 wherein said allocation is based upon a backlog of data at said sender.

7. The method of claim 3 wherein said allocation for a current frame is based upon future frames.

8. The method of claim 3 wherein said allocation is based upon a location within a group of frames.

9. The method of claim 2 wherein said types of frames includes I, B, and P frames.

10. The method of claim 2 wherein said allocation is based upon a sequential set of frames.

11. The method of claim 2 wherein said allocation is based upon a backlog of data at said sender.

12. The method of claim 2 wherein said allocation for a current frame is based upon future frames.

13. The method of claim 2 wherein said allocation is based upon a location within a group of frames.

14. The method of claim 3 wherein said rate distortion model relates the bit rate reduction of one frame of said plurality of frames to a measure of the average distortion of said plurality of frames of said video.

15. The method of claim 14 wherein said measure of average distortion is based on a mean square error.

16. The method of claim 14 wherein said bit rate reduction is achieved by transcoding said video.

17. The method of claim 14 wherein said relation is linear.

18. The method of claim 14 wherein said allocation is based upon minimizing the distortion of said plurality of frames of said video.

19. The method of claim 18 wherein said minimizing is based on equalizing the distortion caused by each frame of said plurality of frames of said video.

20. The method of claim 1 wherein said allocation is based on the end-to-end delay.

21. The method of claim 20 wherein said allocation is based on the initial play-out buffering duration of said receiver.

22. The method of claim 20 wherein said allocation is based on the bandwidth available for transmission of said video across said network interconnection.

23. The method of claim 20 wherein said plurality of frames corresponds to a group of pictures.

24. The method of claim 20 wherein said plurality of frames includes fewer frames than a group of pictures.

25. The method of claim 20 wherein said plurality of frames includes more frames than a group of pictures.

26. The method of claim 14 wherein said measure of average distortion is based on the signal-to-noise ratio.