Method for encoding and decoding video signals

• US 20060072670A1
• Filed: 09/22/2005
• Published: 04/06/2006
• Est. Priority Date: 09/23/2004
• Status: Abandoned Application

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Park, Ji Ho, Park, Seung Wook, Jeon, Byeong Moo
• Application Number:
  US11/231,888
• Publication Number:
  US 20060072670A1
• Time in Patent Office: Days
• US Class Current: 375/240.240
• CPC Class Codes: H04N 19/13 Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC]
• CPC Class Codes: H04N 19/132 Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
• CPC Class Codes: H04N 19/139 Analysis of motion vectors, e.g. their magnitude, direction, variance or reliability
• CPC Class Codes: H04N 19/174 the region being a slice, e.g. a line of blocks or a group of blocks
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• 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 19/615 using motion compensated temporal filtering [MCTF]
• CPC Class Codes: H04N 19/63 using sub-band based transform, e.g. wavelets

Abstract

In one embodiment of the method of decoding an encoded video signal by inverse motion compensated temporal filtering (MCTF), a first image block of the encoded video signal is selectively subtracted from a second image block of the encoded video signal to obtain a decoded second image block. For example, the first image block may be an image block from a H frame in the encoded video signal, and the second image block may be an image block from a L frame in the encoded video signal.

Claims

1. A method of decoding an encoded video signal by inverse motion compensated temporal filtering (MCTF), comprising:

selectively subtracting a first image block of the encoded video signal from a second image block of the encoded video signal to obtain a decoded second image block.

2. The method of claim 1, further comprising:

adding the first image block and the decoded second image block.

3. The method of claim 2, wherein the first image block represents an image difference.

4. The method of claim 1, wherein the first image block represents an image difference.

5. The method of claim 1, further comprising:

obtaining the second image block from at least one of the frames neighboring a frame including the first image block.

6. The method of claim 5, wherein the first image block represents an image difference

7. The method of claim 1, wherein the first image block is an image block from a H frame in the encoded video signal.

8. The method of claim 7, wherein the second image block is an image block from a L frame in the encoded video signal.

9. The method of claim 1, wherein the second image block is an image block from a L frame in the encoded video signal.

10. The method of claim 1, further comprising:

obtaining information indicating whether to subtract the first image block from the second image block; and

wherein

the selectively subtracting step selectively subtracts the first image block from the second image block based on the obtained information.

11. The method of claim 10, wherein the information is deactivated if the first image block was added to an image block to produce the second image block, and the information is activated if the first image block was not added to the image block to produce the second image block.

12. The method of claim 10, wherein the information indicating whether to subtract the first image block is provided in units of frame intervals.

13. The method of claim 10, wherein the information indicates whether to subtract the first image blocks in a frame interval from respective second image blocks.

14. The method of claim 13, wherein the obtaining step obtains the information from a header area of the frame interval.

15. The method of claim 10, wherein the information indicating whether to subtract the first image block is provided in units of slices.

16. The method of claim 10, wherein the information indicates whether to subtract the first image blocks in a slice from respective second image blocks.

17. The method according to claim 16, wherein the obtaining step obtains the information from a header area of the slice.

18. The method according to claim 10, wherein the information indicating whether to subtract the first image block is provided in units of image blocks.

19. The method according to claim 18, wherein the obtaining step obtains the information from a header area of the second image block.

20. A method of decoding an encoded video signal by inverse motion compensated temporal filtering (MCTF), comprising:

selectively performing an inverse update operation.

21. A method of encoding a video signal by motion compensated temporal filtering (MCTF), comprising:

selectively adding a first image block to a second image block associated with the first image block.

22. The method of claim 21, wherein the first image block is an image difference.

23. The method of claim 21, wherein the selectively adding step is performed based on an energy level of the image difference.

24. A method of encoding a video signal by motion compensated temporal filtering (MCTF), comprising:

selectively performing an update operation.

25. A method of encoding a video signal by motion compensated temporal filtering (MCTF), comprising:

adding information to the encoded video signal indicating whether at least one encoded image block in the encoded video signal was obtained by adding an image difference to a image block associated with the image difference.