Piecewise cross color channel predictor

Patent metadata

Field	Value
Publication number	US-8971408-B2
Application number	US-201314370674-A
Country	US
Kind code	B2
Filing date	Jan 23, 2013
Priority date	Apr 14, 2011
Publication date	Mar 3, 2015
Grant date	Mar 3, 2015

Abstract

A sequence of visual dynamic range (VDR) images may be encoded using a standard dynamic range (SDR) base layer and one or more enhancement layers. A prediction image is generated by using piecewise cross-color channel prediction (PCCC), wherein a color channel in the SDR input may be segmented into two or more color channel segments and each segment is assigned its own cross-color channel predictor to derive a predicted output VDR image. PCCC prediction models may include first order, second order, or higher order parameters. Using a minimum mean-square error criterion, a closed form solution is presented for the prediction parameters for a second-order PCCC model. Algorithms for segmenting the color channels into multiple color channel segments are also presented.

First claim

The invention claimed is:

1. A method comprising:
accessing a first image and a second image, each of the images comprising one or more color channels, each of the images comprising a plurality of pixels, each pixel having a respective pixel value for each of the one or more color channels, wherein the second image has a dynamic range that is higher than a dynamic range of the first image;
segmenting at least one color channel of the first image into two or more non-overlapping…

Assignees

• Dolby Lab Licensing Corp

Inventors

• Su Guan-Ming
• Qu Sheng
• Yin Peng

Classifications

• H04N19/593 Primary

  Electricity · mapped topic

• H04N19/14

  Electricity · mapped topic

• H04N19/186

  Electricity · mapped topic

• H04N19/119

  Electricity · mapped topic

• H04N19/194

  Electricity · mapped topic