Apparatus and methods for video compression

Patent metadata

Field	Value
Publication number	US-11765396-B2
Application number	US-202117502852-A
Country	US
Kind code	B2
Filing date	Oct 15, 2021
Priority date	May 13, 2016
Publication date	Sep 19, 2023
Grant date	Sep 19, 2023

Abstract

Reducing artifacts in decoded images includes decoding a first facet of an image, where the first facet includes first edge pixels. A second facet of the image that includes second edge pixels is decoded. The first edge pixels are not adjacent to the second edge pixels and the second facet is decoded independently of the first facet. The first edge pixels are copied to an area adjacent to the second edge pixels. The second edge pixels are filtered using the copied first edge pixels. The second edge pixels are copied to an area adjacent to the first edge pixels. The first edge pixels are filtered using the copied second edge pixels.

First claim

What is claimed is:

1. A method for reducing artifacts in decoded images, comprising:
decoding a first facet of an image, the first facet comprising first edge pixels;
decoding a second facet of the image, the second facet comprising second edge pixels,
wherein the first edge pixels are not adjacent to the second edge pixels, and
wherein the second facet is decoded independently of the first facet;

copying the first edge pixels to an area adjacent to the second edge pixels;
filtering the second edge pixels using the copied first edge pixels;
copying the second edge pixels to an area adjacent to and overlapping the first edge pixels, wherein the copied second edge pixels replace at least some of the first edge pixels, and wherein the first edge pixels are original pixels of the first facet; and
filtering the first edge pixels using the copied second edge pixels.

2. The method of claim 1 , wherein the first edge pixels comprise at least one vector of pixels, the at least one vector of pixels being one of at least one column of pixels or at least one row of pixels.

3. The method of claim 2 , wherein the at least one vector of pixels comprises 8 vectors of pixels.

4. The method of claim 2 , wherein the second edge pixels are arranged in a direction that is perpendicular to the first edge pixels.

5. The method of claim 4 , wherein copying the first edge pixels comprises:
copying a transpose of the first edge pixels to the area adjacent to the second edge pixels.

6. The method of claim 1 , wherein the second edge pixels are filtered further using third pixels of the second facet.

7. The method of claim 6 , wherein the second edge pixels are filtered using a smoothing filter.

8. A device for reducing artifacts in decoded images, comprising:
a processor configured to:
decode a first facet of an image, the first facet comprising first edge pixels;
decode a second facet of the image, the second facet comprising second edge pixels, wherein the first edge pixels are not adjacent to the second edge pixels;
copy the first edge pixels to an area adjacent to the second edge pixels and overlapping the second facet, wherein at least some of the first edge pixels replace at least some original pixels of the second facet of the image; and
filter the second edge pixels using the copied first edge pixels.

9. The device of claim 8 , wherein the first edge pixels comprise at least one vector of pixels, and wherein the at least one vector of pixels is one of at least one column of pixels or at least one row of pixels.

10. The device of claim 9 , wherein the at least one vector of pixels comprises 8 vectors of pixels.

11. The device of claim 9 , wherein the second edge pixels are arranged in a direction that is perpendicular to the first edge pixels.

12. The device of claim 11 , wherein to copy the first edge pixels comprises to:
copy a transpose of the first edge pixels to the area adjacent to the second edge pixels.

13. The device of claim 8 , wherein the second edge pixels are filtered further using third pixels of the second facet.

14. The device of claim 13 , wherein the second edge pixels are filtered using a smoothing filter.

15. A non-transitory computer readable medium storing instructions operable to cause one or more processors to perform operations for reducing artifacts in decoded images, the operations comprising operations to:
decode a first facet of an image, the first facet comprising first edge pixels;
decode a second facet of the image, the second facet comprising second edge pixels, wherein the first edge pixels are not adjacent to the second edge pixels;
copy the first edge pixels to an area adjacent to and overlapping the second edge pixels, wherein at least some of the first edge pixels replace at least some original pixels of the second facet of the image; and
filter the second edge pixels using the copied first edge pixels.

16. The non-transitory computer readable medium of claim 15 , wherein the first edge pixels comprise at least one vector of pixels, and wherein the at least one vector of pixels is one of at least one column of pixels or at least one row of pixels.

17. The device non-transitory computer readable medium of claim 16 , wherein the at least one vector of pixels comprises 8 vectors of pixels.

18. The non-transitory computer readable medium of claim 16 , wherein the second edge pixels are arranged in a direction that is perpendicular to the first edge pixels.

19. The non-transitory computer readable medium of claim 18 , wherein to copy the first edge pixels comprises to:
copy a transpose of the first edge pixels to the area adjacent to the second edge pixels.

20. The non-transitory computer readable medium of claim 15 , wherein the second edge pixels are filtered further using third pixels of the second facet.

Assignees

• Gopro Inc

Inventors

• Abbas Adeel
• Newman David

Classifications

• H04N19/86 Primary

  involving reduction of coding artifacts, e.g. of blockiness · CPC title

• H04N19/597

  specially adapted for multi-view video sequence encoding · CPC title

• H04N19/82

  involving filtering within a prediction loop · CPC title

• H04N19/85

  using pre-processing or post-processing specially adapted for video compression · CPC title

• H04N23/698

  for achieving an enlarged field of view, e.g. panoramic image capture · CPC title