METHOD AND SYSTEM FOR VIDEO NOISE FILTERING

• US 20120026402A1
• Filed: 03/28/2011
• Published: 02/02/2012
• Est. Priority Date: 08/02/2010
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Zhong, Sheng, MacInnis, Alexander
• Granted Patent: US 8,670,073 B2
• Time in Patent Office: Days
• US Class Current: 348/607
• CPC Class Codes: H04N 5/145 Movement estimation for video coding H04N19/51
• CPC Class Codes: H04N 5/21 Circuitry for suppressing or minimising disturbance, e.g. moiré or halo

Abstract

A video processing device may compare a pixel or group of pixels of a current video picture to a pixel or group of pixels of a previous video picture. The video processing device may generate a motion vector for the pixel or group of pixels of the current video picture based on the comparison. The video processing device may determine an amount of filtering to be applied to the pixel or group of pixels of the current video picture. The video processing device may adjust the determined amount of filtering to be applied to the pixel or group of pixels based on the generated motion vector and based on a brightness value.

Claims

1. A method, comprising:

in a video processing device;

comparing a pixel or group of pixels of a current video picture to a pixel or group of pixels of a previous video picture;

generating a motion vector for said pixel or group of pixels of said current video picture based on said comparison;

determining an amount of filtering to be applied to said pixel or group of pixels of said current video picture; and

adjusting said determined amount of filtering to be applied to said pixel or group of pixels based on said generated motion vector and based on a brightness value.

2. The method according to claim 1, wherein said adjusting comprising increasing said determined amount of filtering to be applied to said pixel or group of pixels of said current video picture when a magnitude of one or more components of said motion vector are below a threshold.

3. The method according to claim 1, wherein said adjusting comprises increasing said determined amount of filtering to be applied to said pixel or group of pixels of said current video picture when said brightness value associated with said pixel or group of pixels is below a threshold.

4. The method according to claim 1, wherein said brightness value is an average luminance of said pixel or group of pixels of said current video picture.

5. The method according to claim 1, wherein said brightness value is an average luminance of said pixel or group of pixels of said previous video picture.

6. The method according to claim 1, comprising adjusting said amount of filtering to be applied to said pixel or group of pixels as a piecewise function of said brightness value.

7. The method according to claim 1, comprising adjusting said amount of filtering to be applied to said pixel or group of pixels as a linear or non-linear function of said brightness value.

8. The method according to claim 1, wherein said current video picture and said previous video picture are video frames.

9. The method according to claim 1, wherein said current video picture and said previous video picture are video fields of the same parity.

10. The method according to claim 1, comprising generating filter coefficients based on said determined amount of filtering to be applied to said pixel or group of pixels.

11. A system, comprising:

one or more circuits for use in a video processing device, said one or more circuits being operable to;

compare a pixel or group of pixels of a current video picture to a pixel or group of pixels of a previous video picture;

generate a motion vector for said pixel or group of pixels of said current video picture based on said comparison;

determine an amount of filtering to be applied to said pixel or group of pixels of said current video picture; and

adjust said determined amount of filtering to be applied to said pixel or group of pixels based on said generated motion vector and based on a brightness value.

12. The system according to claim 11, wherein said adjusting comprising increasing said determined amount of filtering to be applied to said pixel or group of pixels of said current video picture when a magnitude of one or more components of said motion vector are below a threshold.

13. The system according to claim 11, wherein said adjusting comprises increasing said determined amount of filtering to be applied to said pixel or group of pixels of said current video picture when said brightness value associated with said pixel or group of pixels is below a threshold.

14. The system according to claim 11, wherein said brightness value is an average luminance of said pixel or group of pixels of said current video picture.

15. The system according to claim 11, wherein said brightness value is an average luminance of said pixel or group of pixels of said previous video picture.

16. The system according to claim 11, wherein said one or more circuits are operable to adjust said amount of filtering to be applied to said pixel or group of pixels as a piecewise function of said brightness value.

17. The system according to claim 11, wherein said one or more circuits are operable to adjust said amount of filtering to be applied to said pixel or group of pixels as a linear or non-linear function of said brightness value.

18. The system according to claim 11, wherein said current video picture and said previous video picture are video frames.

19. The system according to claim 11, wherein said current video picture and said previous video picture are video fields of the same parity.

20. The system according to claim 11, wherein said one or more circuits are operable to generate filter coefficients based on said determined amount of filtering to be applied to said pixel or group of pixels.