VIDEO CODING

• US 20070171986A1
• Filed: 02/05/2007
• Published: 07/26/2007
• Est. Priority Date: 07/19/1999
• Status: Active Grant

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Corporation
• Inventors: Hannuksela, Miska
• Granted Patent: US 8,401,089 B2
• Time in Patent Office: Days
• US Class Current: 375/240.260
• CPC Class Codes: H04N 19/00 Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
• CPC Class Codes: H04N 19/159 Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction
• CPC Class Codes: H04N 19/172 the region being a picture, frame or field
• CPC Class Codes: H04N 19/46 Embedding additional information in the video signal during the compression process H04N19/517, H04N19/68, H04N19/70 take precedence
• CPC Class Codes: H04N 19/61 in combination with predictive coding
• CPC Class Codes: H04N 19/70 characterised by syntax aspects related to video coding, e.g. related to compression standards
• CPC Class Codes: H04N 19/89 involving methods or arrangements for detection of transmission errors at the decoder

Abstract

A method of video encoding including receiving a video signal to be coded; coding data representing a frame of said video signal; and repeating part, but not all, of the data. The repeated part including the picture header for the frame. A method of decoding an encoded video signal including receiving coded data representing frames of a video signal; examining the coded data to detect header data and picture data; when an error in the picture header is detected, storing the picture data in a temporary picture data store, detecting a repeat of the header data; and decoding the stored picture data using the repeated header data

Claims

1. A method of video source encoding to form a source encoded bit-stream representative of a sequence of video frames, the method comprising:

forming a first source encoded bit-stream portion representative of a first video frame, the first source encoded bit-stream portion including picture header data for the first video frame and source encoded picture data for the first video frame;

forming a second source encoded bit-stream portion, the second source encoded bit-stream portion including a repeat of at least a part of the picture header data for the first video frame; and

providing the second source encoded bit-stream portion in the source encoded bit-stream subsequent to the first source encoded bit-stream portion.

2. A method according to claim 1, comprising forming a second source encoded bit-stream portion including a repeat of at least a part of the picture header data for the first video frame only if the first video frame is encoded in INTRA-frame format.

3. A method according to claim 1, comprising forming the second source encoded bit-stream portion as a source encoded bit-stream portion representative of an incomplete part of a video frame and including a repeat of at least a part of the picture header data for the first video frame and a first segment of the source encoded picture data for the first video frame.

4. A method according to claim 1, comprising forming the second source encoded bit-stream portion as a source encoded bit-stream portion that includes a repeat of at least a part of the picture header data for the first video frame and further data, the further data indicating that the second source encoded bit-stream portion is representative of a video frame that is unaltered with respect to a reference frame of the video signal.

5. A method according to claim 4, wherein the further data comprises an indication or indications that no source encoded picture data has changed with respect to a previous video frame of the video signal.

6. A method according to claim 1, comprising forming the second source encoded bit-stream portion as a source encoded bit-stream portion representative of a video frame subsequent to the first video frame in the sequence of video frames, the second source encoded bit-stream portion including picture header data for the subsequent video frame and source encoded picture data for the subsequent video frame, and including a repeat of at least a part of the picture header data for the first video frame in the picture header data of the subsequent video frame.

7. A method according to claim 6, comprising including a repeat of at least a part of the picture header data for the first video frame in Supplemental Enhancement Information (SEI) of the subsequent video frame.

8. A method according to claim 7, comprising including a repeat of at least a part of the picture header data for the first video frame in the Supplemental Enhancement Information (SEI) of the subsequent video frame, excluding the picture start code for the first video frame.

9. A method according to claim 6, comprising repeating certain fields of the picture header data for the first video frame in the picture header data of the subsequent video frame.

10. Video source encoding apparatus for forming a source encoded bit-stream representative of a sequence of video frames, the video source encoding apparatus comprising circuitry arranged to:

form a first source encoded bit-stream portion representative of a first video frame, the first source encoded bit-stream portion including picture header data for the first video frame and source encoded picture data for the first video frame;

form a second source encoded bit-stream portion, the second source encoded bit-stream portion including a repeat of at least a part of the picture header data for the first frame; and

provide the second source encoded bit-stream portion in the source encoded bit-stream subsequent to the first source encoded bit-stream portion.

11. Video source encoding apparatus according to claim 10, wherein the circuitry is arranged to form a second source encoded bit-stream portion including a repeat of at least a part of the picture header data for the first video frame only if the first video frame is encoded in INTRA-frame format.

12. Video source encoding apparatus according to claim 10, wherein the circuitry is arranged to form the second source encoded bit-stream portion as a source encoded bit-stream portion representative of an incomplete part of a video frame and to include a repeat of at least part of the picture header data for the first video frame and a first segment of the source encoded picture data for the first frame.

13. Video source encoding apparatus according to claim 10, wherein the circuitry is arranged to form the second source encoded bit-stream portion as a source encoded bit-stream portion that includes a repeat of at least part of the picture header data for the first video frame and further data, the further data signifying that the second source encoded bit-stream portion is representative of a video frame that is unaltered with respect to a reference frame of the video signal.

14. Video source encoding apparatus according to claim 13, wherein the further data comprises an indication or indications that no source encoded picture data has changed with respect to a previous video frame of the video signal.

15. Video source encoding apparatus according to claim 10, wherein the circuitry is arranged to form the second source encoded bit-stream portion as a source encoded bit-stream portion representative of a video frame subsequent to the first video frame in the sequence of video frames, the second source encoded bit-stream portion including picture header data for the subsequent video frame and source encoded picture data for the subsequent video frame and to include a repeat of at least a part of the picture header data for the first video frame in the picture header data for the subsequent video frame.

16. Video source encoding apparatus according to claim 15, wherein the circuitry is arranged to include a repeat of at least a part of the picture header data for the first video frame in Supplemental Enhancement Information (SEI) of the subsequent video frame.

17. Video source encoding apparatus according to claim 16, wherein the circuitry is arranged to include a repeat of at least a part of the picture header data for the first video frame in the Supplemental Enhancement Information (SEI) of the subsequent video frame, excluding the picture start code for the first video frame.

18. Video source encoding apparatus according to claim 15, wherein the circuitry is arranged to repeat certain fields of the picture header data for the first video frame in the picture header data of the subsequent video frame.

20. A network device comprising video source encoding apparatus according to claim 10.

21. A terminal device comprising video source encoding apparatus according to claim 10.

22. A device according to claim 20, wherein the device is arranged to operate in a packet switched network.

23. A device according to claim 20, wherein the device is arranged to operate in a circuit switched network.

24. A device according to claim 20, wherein the device is arranged to operate in a mobile communications network.

25. A device according to claim 20, wherein the device is arranged to operate in the Internet.

26. A device according to claim 20, wherein the device is arranged to provide real-time video.

27. A network including a network device according to claim 20.

19. A data signal comprising a source encoded bit-stream representative of a sequence of video frames, the source encoded bit-stream comprising:

a first source encoded bit-stream portion representative of a first video frame of the sequence of video frames, the first source encoded bit-stream portion including picture header data for the first video frame and source encoded picture data for the first video frame; and

a second source encoded bit-stream portion, the second source encoded bit-stream portion including a repeat of at least a part of the picture header data for the first video frame, the second source encoded bit-stream portion provided in the source encoded bit-stream subsequent to the first source encoded bit-stream portion.