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1. (WO2016055875) IMPROVED VIDEO AND IMAGE ENCODING PROCESS

Pub. No.:    WO/2016/055875    International Application No.:    PCT/IB2015/054544
Publication Date: Fri Apr 15 01:59:59 CEST 2016 International Filing Date: Wed Jun 17 01:59:59 CEST 2015
IPC: H04N 19/117
H04N 19/186
H04N 19/187
H04N 19/33
H04N 19/85
Applicants: AGOSTINELLI, Massimiliano
Inventors: AGOSTINELLI, Massimiliano
Title: IMPROVED VIDEO AND IMAGE ENCODING PROCESS
Abstract:
A method for processing image and video data, comprising providing high dynamic range image data (HDR) and a corresponding low dynamic range image data (LDR). The LDR image is encoded in a legacy code stream, while a residual code stream is generated and encoded containing data necessary for the reconstruction of the HDR image in a decoding phase. To generate the residual code stream, LDR image data are processed so as to obtain a processed LDR* image, then a component data of the HDR image and a corresponding component of the processed LDR* image are selected and residual data of the selected component data are calculated by dividing the component of the processed LDR* image data by the component of the HDR image data. The residual data of the selected component are scaled into the range of values comprised between 0 and 1 and are then encoded in a residual code stream. A decoding method is also disclosed which allows reconstruction of an HDR image from a legacy code stream and a residual data code stream.