High-dynamics image transmission system, encoding and decoding units and methods therefor

摘要

A high dynamic picture transmission system is provided. The transmission system includes a coding unit configured to generate a standard bitstream and at least a second bitstream. The standard bitstream coding the pictures such that the luminance of each pixel is coded with a standard dynamic, and the second bitstream contains the information necessary to reconstruct the luminance of high dynamic pictures from the coded luminance with the standard dynamic contained in the standard bitstream.

主权项

1. A coding unit suitable to generate bitstreams coding high dynamic range digital pictures in which a luminance level of each pixel is coded on m bits, m being a whole number greater than or equal to ten, wherein the coding unit is able to generate:
a standard bitstream coding pictures of standard dynamic range Istd obtained from the high dynamic range digital pictures in which the luminance level of each pixel of each standard dynamic range picture is uniquely coded on at most n bits, where n is a whole number strictly less than m, a residual bitstream coding only a difference in luminance levels between each said pixel of a picture ILCD and each corresponding pixel of a picture estimation Istd of said picture ILCD obtained from the pictures of said standard dynamic range Istd, the picture ILCD being the picture displayed by an LCD (Liquid Crystal Display) back-lit by a projector of pictures projecting a picture ILED; and a third bitstream coding pictures ILED in respect of the standard bitstream, the pictures ILED being those projected by a picture projector used to back-light an LCD (Liquid Crystal Display) displaying a picture ILCD.