System and method for video coding in a dynamic environment

• US 8,934,026 B2
• Filed: 05/12/2011
• Issued: 01/13/2015
• Est. Priority Date: 05/12/2011
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Tian, Dihong, Chen, Wen-Hsiung
• Primary Examiner(s): DIEP, TRUNG T
• Application Number:
  US13/106,002
• Publication Number:
  US 20120287302A1
• Time in Patent Office: 1,342 Days
• Field of Search: 348/143, 348/211.99, 3482111-2118, 348/207.1, 348/207.11, 348/222.1, 348/223.1, 348/362
• US Class Current: 348/222.1
• CPC Class Codes: H04N 19/82 involving filtering within a prediction loop
• CPC Class Codes: H04N 21/4223 Cameras H04N23/00 takes precedence
• CPC Class Codes: H04N 21/6125 involving transmission via Internet transmission by internet of broadcast information H04H60/82
• CPC Class Codes: H04N 21/6547 comprising parameters, e.g. for client setup
• CPC Class Codes: H04N 23/661 Transmitting camera control signals through networks, e.g. control via the Internet
• CPC Class Codes: H04N 23/695 Control of camera direction for changing a field of view, e.g. pan, tilt or based on tracking of objects

Abstract

A method is provided in one example embodiment and includes receiving a camera dynamic parameter; determining a reference transform parameter based on the camera dynamic parameter; applying the reference transform parameter to generate a video image; and encoding the reference transform parameter in a bitstream for transmission with the video image. In other more specific instances, the method may include decoding a particular video image; decoding a particular reference transform parameter; and applying a particular reference transform parameter to the particular video image. The entropy-decoded data can undergo inverse quantization and transformation such that reference transformed data is combined with the entropy-decoded data. Additionally, the entropy-decoded data can be subjected to filtering before decoded video images are rendered on a display.

Claims

1. A method, comprising:

receiving a camera dynamic parameter that indicates a change in camera dynamics associated with a video image;

determining a reference transform parameter based on the camera dynamic parameter;

applying the reference transform parameter to a previously-processed video image to generate a reference video image;

encoding the video image using the reference video image;

encoding the reference transform parameter; and

combining the encoded video image and the encoded reference transform parameter to form a bitstream for transmission.

2. The method of claim 1, wherein the camera dynamic parameter is a selected one of a group of parameters for a video camera, the group consisting of:

a) pan-tilt-zoom characteristic of the video camera;

b) an exposure characteristic of the video camera;

c) a white balance characteristic of the video camera; and

d) a focus characteristic of the video camera.

3. The method of claim 1, wherein receiving the camera dynamic parameter further includes:

capturing the video image with a video camera; and

determining the camera dynamic parameter by analysis of adjustments made by the video camera during capturing of video images.

4. The method of claim 1, wherein the reference transform parameter is a selected one of a group of parameters, the group consisting of:

a) an affine transformation;

b) a multiplicative modeling;

c) an exponential modeling; and

d) a point-spread function.

5. The method of claim 1, further comprising:

applying motion estimation and compensation to a reference transformed video signal.

6. The method of claim 1, further comprising:

decoding a particular video image;

decoding a particular reference transform parameter; and

applying a particular reference transform parameter to the particular video image, wherein entropy-decoded data undergoes inverse quantization and transformation such that reference transformed data is combined with the entropy-decoded data.

7. The method of claim 1, wherein encoding the reference transform parameter in the bitstream includes encoding which previously-processed video image is transformed with the reference transform parameter, and which video image is encoded using a transformed previously processed image.

8. Logic encoded in non-transitory tangible media that includes code for execution and when executed by a processor operable to perform operations comprising:

receiving a camera dynamic parameter that indicates a change in camera dynamics associated with a video image;

determining a reference transform parameter based on the camera dynamic parameter;

applying the reference transform parameter to a previously-processed video image to generate a reference video image;

encoding the video image using the reference video image;

encoding the reference transform parameter; and

combining the encoded video image and the encoded reference transform parameter to form a bitstream for transmission.

9. The logic of claim 8, wherein the camera dynamic parameter is a selected one of a group of parameters for a video camera, the group consisting of:

a) pan-tilt-zoom characteristic of the video camera;

b) an exposure characteristic of the video camera;

c) a white balance characteristic of the video camera; and

d) a focus characteristic of the video camera.

10. The logic of claim 8, wherein receiving the camera dynamic parameter further includes:

capturing the video image with a video camera; and

determining the camera dynamic parameter by analysis of adjustments made by the video camera during capturing of video images.

11. The logic of claim 8, wherein the reference transform parameter is a selected one of a group of parameters, the group consisting of:

a) an affine transformation;

b) a multiplicative modeling;

c) an exponential modeling; and

d) a point-spread function.

12. The logic of claim 8, the operations further comprising:

applying motion estimation and compensation to a reference transformed video signal.

13. The logic of claim 8, the operations further comprising:

decoding a particular video image;

decoding a particular reference transform parameter; and

applying a particular reference transform parameter to the particular video image, wherein entropy-decoded data undergoes inverse quantization and transformation such that reference transformed data is combined with the entropy-decoded data.

14. The logic of claim 8, wherein encoding the reference transform parameter in the bitstream includes encoding which previously-processed video image is transformed with the reference transform parameter, and which video image is encoded using a transformed previously processed image.

15. An apparatus, comprising:

a video element;

a memory element configured to store data; and

a processor operable to execute instructions associated with the data such that the apparatus is configured for;

receiving a camera dynamic parameter that indicates a change in camera dynamics associated with a video image;

determining a reference transform parameter based on the camera dynamic parameter;

applying the reference transform parameter to a previously-processed video image to generate a reference video image;

encoding the video image using the reference video image;

encoding the reference transform parameter; and

combining the encoded video image and the encoded reference transform parameter to form a bitstream for transmission.

16. The apparatus of claim 15, wherein the camera dynamic parameter is a selected one of a group of parameters for a video camera, the group consisting of:

a) pan-tilt-zoom characteristic of the video camera;

b) an exposure characteristic of the video camera;

c) a white balance characteristic of the video camera; and

d) a focus characteristic of the video camera.

17. The apparatus of claim 15, wherein receiving the camera dynamic parameter further includes:

capturing the video image with a video camera; and

determining the camera dynamic parameter by analysis of adjustments made by the video camera during capturing of video images.

18. The apparatus of claim 15, wherein the reference transform parameter is a selected one of a group of parameters, the group consisting of:

a) an affine transformation;

b) a multiplicative modeling;

c) an exponential modeling; and

d) a point-spread function.

19. The apparatus of claim 15, wherein the apparatus is further configured for:

applying motion estimation and compensation to a reference transformed video signal.

20. The apparatus of claim 15, wherein the apparatus is further configured for:

decoding a particular video image;

decoding a particular reference transform parameter; and

applying a particular reference transform parameter to the particular video image, wherein entropy-decoded data undergoes inverse quantization and transformation such that reference transformed data is combined with the entropy-decoded data.