Compression and decoding of single sensor color image data

• US 8,879,861 B2
• Filed: 03/21/2014
• Issued: 11/04/2014
• Est. Priority Date: 03/22/2006
• Status: Active Grant

• Current Assignee: GoPro, Inc.
• Original Assignee: GoPro, Inc.
• Inventors: Newman, David A.
• Primary Examiner(s): Tran, Phuoc
• Application Number:
  US14/222,549
• Publication Number:
  US 20140205191A1
• Time in Patent Office: 228 Days
• Field of Search: 382/166, 382/167, 382/233, 382/240, 382/260, 348/266, 348/267, 348/273, 348/280
• US Class Current: 382/233
• CPC Class Codes: G06F 3/0484 for the control of specific functions or operations, e.g. selecting or manipulating an object, an image or a displayed text element, setting a parameter value or selecting a range
• CPC Class Codes: G06T 9/00 Image coding bandwidth or redundancy reduction for static pictures H04N1/41; coding or decoding of static colour picture signals H04N1/64; methods or arrangements for coding, decoding, compressing or decompressing digital video signals H04N19/00
• CPC Class Codes: H04N 1/648 Transmitting or storing the primary (additive or subtractive) colour signals; Compression thereof H04N1/642 - H04N1/646 take precedence
• CPC Class Codes: H04N 19/117 Filters, e.g. for pre-processing or post-processing sub-band filter banks H04N19/635
• CPC Class Codes: H04N 19/136 Incoming video signal characteristics or properties
• CPC Class Codes: H04N 19/186 the unit being a colour or a chrominance component
• CPC Class Codes: H04N 19/44 Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
• CPC Class Codes: H04N 19/85 using pre-processing or post-processing specially adapted for video compression
• CPC Class Codes: H04N 23/667 Camera operation mode switching, e.g. between still and video, sport and normal or high- and low-resolution modes
• CPC Class Codes: H04N 5/265 Mixing

Abstract

A method is described to greatly improve the efficiency of and reduce the complexity of image compression when using single-sensor color imagers for video acquisition. The method in addition allows for this new image compression type to be compatible with existing video processing tools, improving the workflow for film and television production.

Claims

1. A method for decoding an encoded image representative of an original image at an original resolution and comprising a set of encoded image planes each representative of one or more original image planes of the original image, the method comprising:

in response to receiving a request for the original image;

accessing the set of encoded image planes, at least one encoded image plane representative of two or more original image planes; and

decoding the accessed set of encoded image planes to produce the original image at the original resolution; and

in response to receiving a request for a preview of the original image;

accessing a subset of the set of encoded image planes, the subset comprising less than all of the set of encoded image planes; and

decoding the accessed subset of encoded image planes to produce the original image at a preview resolution lower than the original resolution.

2. The method of claim 1, wherein the preview resolution comprises a resolution that is one-quarter the resolution of the original resolution.

3. The method of claim 1, wherein the set of encoded image planes comprises a first encoded image plane representative of a first color and a second encoded image plane representative of the first color, and wherein the subset of the set of encoded image planes comprises only one of the first encoded image plane and the second encoded image plane.

4. The method of claim 1, wherein decoding the accessed set of encoded image planes comprises:

decoding each of the accessed set of encoded image planes to produce the one or more original image planes; and

combining the one or more original image planes to produce the original image at the original resolution.

5. The method of claim 1, wherein decoding the accessed subset of the set of encoded image planes comprises:

decoding one or more of the accessed subset of the set of encoded image planes to produce a subset of the one or more original image planes, the subset comprising less than all of the one or more original image planes; and

combining the subset of the one or more original image planes to produce the original image at the preview resolution.

6. The method of claim 5, wherein decoding the accessed subset of the set of encoded image planes further comprises:

decoding one of the accessed subset of the set of encoded image planes to produce a preview image plane representative of two original image planes; and

combining the preview image plane and the subset of the one or more original image planes to produce the original image at the preview resolution.

7. The method of claim 6, wherein decoding one of the accessed subset of the set of encoded image planes comprises decoding an encoded image plane comprising an average of the two original image planes.

8. The method of claim 7, wherein the two original image planes are representative of the same color.

9. The method of claim 1, wherein each pixel of the original image at the preview resolution comprises a red sub-pixel, a blue sub-pixel, and a green sub-pixel.

10. The method of claim 1, wherein each pixel of the original image at the original resolution comprises a red sub-pixel, a blue sub-pixel, a first green sub-pixel, and a second green sub-pixel.

11. A system for decoding an encoded image representative of an original image at an original resolution and comprising a set of encoded image planes each representative of one or more original image planes of the original image, the system comprising:

an input configured to receive a request for an image;

a decoder configured to;

in response to receiving a request for the original image;

access the set of encoded image planes, at least one encoded image plane representative of two or more original image planes; and

decode the accessed set of encoded image planes to produce the original image at the original resolution; and

in response to receiving a request for a preview of the original image;

access a subset of the set of encoded image planes, the subset comprising less than all of the set of encoded image planes; and

decode the accessed subset of encoded image planes to produce the original image at a preview resolution lower than the original resolution; and

an output configured to output produced images.

12. The system of claim 11, wherein the preview resolution comprises a resolution that is one-quarter the resolution of the original resolution.

13. The system of claim 11, wherein the set of encoded image planes comprises a first encoded image plane representative of a first color and a second encoded image plane representative of the first color, and wherein the subset of the set of encoded image planes comprises only one of the first encoded image plane and the second encoded image plane.

14. The system of claim 11, wherein decoding the accessed set of encoded image planes comprises:

decoding each of the accessed set of encoded image planes to produce the one or more original image planes; and

combining the one or more original image planes to produce the original image at the original resolution.

15. The system of claim 11, wherein decoding the accessed subset of the set of encoded image planes comprises:

decoding one or more of the accessed subset of the set of encoded image planes to produce a subset of the one or more original image planes, the subset comprising less than all of the one or more original image planes; and

combining the subset of the one or more original image planes to produce the original image at the preview resolution.

16. The system of claim 15, wherein decoding the accessed subset of the set of encoded image planes further comprises:

decoding one of the accessed subset of the set of encoded image planes to produce a preview image plane representative of two original image planes; and

combining the preview image plane and the subset of the one or more original image planes to produce the original image at the preview resolution.

17. The system of claim 16, wherein decoding one of the accessed subset of the set of encoded image planes comprises decoding an encoded image plane comprising an average of the two original image planes.

18. The system of claim 17, wherein the two original image planes are representative of the same color.

19. The system of claim 11, wherein each pixel of the original image at the preview resolution comprises a red sub-pixel, a blue sub-pixel, and a green sub-pixel.

20. The system of claim 11, wherein each pixel of the original image at the original resolution comprises a red sub-pixel, a blue sub-pixel, a first green sub-pixel, and a second green sub-pixel.