Methods and Systems for Inter-Layer Image Prediction Signaling

• US 20150208081A1
• Filed: 01/26/2015
• Published: 07/23/2015
• Est. Priority Date: 01/23/2007
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Laboratories of America Incorporated (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Segall, Christopher A.
• Granted Patent: US 9,497,387 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06T 2207/20208 High dynamic range [HDR] image processing
• CPC Class Codes: G06T 5/50 using two or more images, e.g. averaging or subtraction
• CPC Class Codes: G06T 5/92 based on global image properties
• CPC Class Codes: G06T 5/94 based on local image properties, e.g. for local contrast enhancement
• CPC Class Codes: H04N 19/105 Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
• CPC Class Codes: H04N 19/134 characterised by the element, parameter or criterion affecting or controlling the adaptive coding
• CPC Class Codes: H04N 19/137 Motion inside a coding unit, e.g. average field, frame or block difference
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/184 the unit being bits, e.g. of the compressed video stream
• CPC Class Codes: H04N 19/186 the unit being a colour or a chrominance component
• CPC Class Codes: H04N 19/187 the unit being a scalable video layer
• CPC Class Codes: H04N 19/36 Scalability techniques involving formatting the layers as a function of picture distortion after decoding, e.g. signal-to-noise [SNR] scalability
• 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 19/46 Embedding additional information in the video signal during the compression process H04N19/517, H04N19/68, H04N19/70 take precedence
• CPC Class Codes: H04N 19/503 involving temporal prediction adaptive coding with adaptive selection between spatial and temporal predictive coding H04N19/107; adaptive coding with adaptive selection among a plurality of temporal predictive coding modes H04N19/109
• CPC Class Codes: H04N 19/61 in combination with predictive coding
• CPC Class Codes: H04N 23/741 by increasing the dynamic range of the image compared to the dynamic range of the electronic image sensors

Abstract

Embodiments of the present invention comprise systems and methods for predicting high dynamic range (HDR) image blocks with block-specific prediction data, where the systems and methods may comprise low dynamic range (LDR) image data and HDR image data for a target image block, where a scaled, offset LDR image block may be combined with HDR residual image block to form an HDR image block corresponding to the target image block.

Claims

1. A method for predicting an image, the method comprising:

receiving a high-level prediction message defining prediction data for a plurality of image elements wherein the message disables transmission of element-specific prediction data for individual image elements;

receiving high dynamic range (HDR) image data for the plurality of image elements, the HDR image data comprising HDR residual image blocks; and

predicting the plurality of image elements using data from the high-level prediction message.

2. The method of claim 1 wherein the plurality of image elements comprises an image block.

3. The method of claim 1 wherein the plurality of image elements comprises an image frame.

4. The method of claim 1 further comprising receiving a high-level prediction message wherein the message enables transmission of element-specific prediction data for individual image elements.

5. The method of claim 1 wherein the prediction data defined by the high-level prediction message comprises a scaling factor.

6. The method of claim 1 wherein the prediction data defined by the high-level prediction message comprises an offset factor.

7. A method for predicting a high dynamic range image block with differentially-coded prediction data, the method comprising:

receiving high dynamic range (HDR) image data for a first image block, the first image block HDR image data comprising a first prediction data for the first image block;

receiving high dynamic range (HDR) image data for a second image block, the second image block HDR image data comprising a prediction difference data related to the first prediction data;

combining the first prediction data and the prediction difference data to determine second prediction data for the second image block; and

determining a first HDR residual image block based on the received HDR image data for the first image block and a decoded low dynamic range (LDR) image, wherein the LDR image is a scaled decoded LDR image, and wherein the scaled decoded LDR image is an offset scaled decoded LDR image.