Method for coding RGB color space signal

• US 8,135,225 B2
• Filed: 06/22/2007
• Issued: 03/13/2012
• Est. Priority Date: 06/04/2007
• Status: Expired due to Fees

• Current Assignee: Korea Electronics Technology Institute (Government of South Korea)
• Original Assignee: Korea Electronics Technology Institute (Government of South Korea)
• Inventors: Kim, Yong-Hwan, Park, Ji-Ho, Choi, Byeong-Ho, Kim, Je-Woo, Paik, Joonki
• Primary Examiner(s): Mehta, Bhavesh
• Assistant Examiner(s): Patel, Nirav G
• Application Number:
  US11/767,242
• Publication Number:
  US 20080298694A1
• Time in Patent Office: 1,726 Days
• Field of Search: 382/236
• US Class Current: 382/236
• 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 19/103 Selection of coding mode or of prediction mode
• CPC Class Codes: H04N 19/159 Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/186 the unit being a colour or a chrominance component
• CPC Class Codes: H04N 19/61 in combination with predictive coding
• CPC Class Codes: H04N 19/82 involving filtering within a prediction loop
• CPC Class Codes: H04N 19/86 involving reduction of coding artifacts, e.g. of blockiness

Abstract

A method for coding an RGB color space signal is disclosed. In accordance with the method, a base plane is encoded using an independent mode, and an enhanced plane is encoded by referring to the base plane without converting the RGB color space signal into YCbCr color space signal to reduce a redundancy between RGB planes and improve a compression ratio of an image.

Claims

1. A method for encoding an RGB color space signal, comprising steps of:

(a) encoding a base plane from the RGB color space signal having a color_plane_id of a first value using an H.264/Advanced Video Coding independent mode profile, wherein the color_plane_id of the first value is configured to indicate base plane encoding; and

(b) encoding one or more enhanced planes having a color_plane_id of a second value by referring to the base plane, wherein the color_plane _id of the second value is configured to indicate enhanced plane encoding, and wherein the step (b) further comprises;

(b-1) encoding a current macroblock by referring to a reference macroblock in an intra base plane macroblock mode, wherein the reference macroblock is a macroblock of the base plane;

(b-2) encoding the current macroblock using an intra prediction mode of the base plane; and

(b-3) encoding a difference between residual information generated by encoding the current macroblock and residual information generated by encoding the reference macroblock, wherein the residual information generated by encoding the reference macroblock is information generated by encoding the reference macroblock using the intra prediction mode in the base plane, and the residual information generated by encoding the current macroblock is information generated by encoding the current macroblock using a mode identical to the intra prediction mode of the base plane when the current macroblock is a macroblock included in the one or more enhanced plane.

2. The method in accordance with claim 1, wherein the first value is zero and the second value is 1 or higher.

3. The method in accordance with claim 1, wherein encoding the one or more enhanced plane comprises encoding a first enhanced plane and a second enhanced plane, and the step (b) comprises encoding the first enhanced plane by referring to the base plane and encoding the second enhanced plane by referring to the base plane and the first enhanced plane.

4. The method in accordance with claim 1, wherein information on a use of the intra base plane macroblock mode is stored in at least one of a macroblock hierarchy, a slice information, a slice header, a slice extended information, a picture parameter set and a sequence parameter set.

5. The method in accordance with claim 1, further comprising subjecting the residual information generated by encoding the reference macroblock to low pass filtering in a vertical direction, a horizontal direction, or a DC direction.

6. A method for encoding an RGB color space signal, comprising steps of:

(a) encoding a base plane from the RGB color space signal having a color_plane_id of a first value using an H.264/Advanced Video Coding independent mode profile, wherein the color_plane_id of the first value is configured to indicate base plane encoding; and

(b) encoding one or more enhanced planes having a color_plane_id of a second value by referring to the base plane, wherein the color_plane_id of the second value is configured to indicate enhanced plane encoding, wherein a reference macroblock is an inter macroblock in an inter base plane macroblock mode, and a current macroblock is encoded using a motion information of the reference macroblock, and wherein the step (b) further comprises;

(b-1) encoding the current macroblock using a motion information of the base plane; and

(b-2) encoding a difference between residual information generated by encoding the current macroblock and residual information generated by encoding the reference macroblock.

7. The method in accordance with claim 6, further comprising subjecting the residual information generated by encoding the reference macroblock to a low pass filtering in a vertical direction, a horizontal direction, or a DC direction.

8. A method for encoding an RGB color space signal, comprising steps of:

(a) encoding a base plane from the RGB color space signal having a color_plane_id of a first value using an H.264/Advanced Video Coding independent mode profile, wherein the color_plane_id of the first value is configured to indicate base plane encoding; and

(b) encoding one or more enhanced planes having a color_plane_id of a second value by referring to the base plane, wherein the color_plane_id of the second value is configured to indicate enhanced plane encoding, wherein a reference macroblock is an inter macroblock in an inter base plane macroblock mode, and a current macroblock is encoded using a reference index of the reference macroblock and using a motion vector as a prediction value, and wherein information on a use of the inter base plane macroblock mode is stored in at least one of a macroblock hierarchy, a slice information, a slice header, a slice extended information, a picture parameter set and a sequence parameter set.

9. A method for encoding an RGB color space signal, comprising steps of:

(a) encoding a base plane from the RGB color space signal having a color_plane_id of a first value using an H.264/Advanced Video Coding independent mode profile, wherein the color_plane_id of the first value is configured to indicate base plane encoding;

(b) encoding one or more enhanced planes having a color_plane_id of a second value by referring to the base plane, wherein the color_plane_id of the second value is configured to indicate enhanced plane encoding; and

(c) carrying out a filtering having a constant intensity for deblocking.