Method and apparatus for conversion of HDR signals

Converting a high dynamic range (HDR) source video signal with a source colour space to a lower dynamic range (LDR) target television signal with a target colour scheme, comprising: receiving the video signal from the source and providing it as a luminance component and seperate colour components fo...

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Bibliographic Details
Main Author Tim Borer
Format Patent
LanguageEnglish
Published 10.08.2016
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
PHYSICS
PICTORIAL COMMUNICATION, e.g. TELEVISION
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Summary:Converting a high dynamic range (HDR) source video signal with a source colour space to a lower dynamic range (LDR) target television signal with a target colour scheme, comprising: receiving the video signal from the source and providing it as a luminance component and seperate colour components for each pixel; determining a maximum brightness for the colour components in the target colour scheme; applying a compression function, that depends on the maximum intensity, to the luminance component of each pixel; outputting the compressed luminance component and distinct colour components in the target colour scheme; and/or performing the inverse process. A 3D look-up table (LUT) may be used in the tone mapping. Compression curves may be used in the colour grading. Transformation formula may include a limiting aspect. An opto-electronic transfer function (OETF) may be used. A system gamma may be used. Colour format may be RGB or YCbCr. Non-linearity may be applied to each channel. The extended dynamic range (EDR) signal may have a wider gamut than the standard dynamic range (SDR) signal. Colour values may be compressed. The dynamic range reduction may be implemented in a receiver, transmitter, set top box, display, camera or studio chain.
Bibliography:Application Number: GB20150002016