METHOD AND APPARATUS FOR ENCODING VIDEO COLOR ENHANCEMENT DATA, AND METHOD AND APPARATUS FOR DECODING VIDEO COLOR ENHANCEMENT DATA

摘要

A highly accurate reproduction of visual intensity and contrast rather than the conventional 8-bit color depth is more and more used, motivating the development of an enhanced dynamic range called high bit-depth. A method for encoding a first, low bit-depth image (IMBL) of M bit RGB pixels and a second, high bit-depth video image (IMEL) of N bit RGB pixels, MN, both having same spatial resolution, comprises generating a first transfer function (LUTinter) based on color histograms (HistBL, HistEL) of the first and the second video image, generating a second transfer function (LUTfinal) based on the first transfer function (LUTinter), applying (TR) the second transfer function (LUTfinal) to the first video image, wherein a transformed first video image (IMTR, BL) is generated, calculating and encoding the residual (IMres) f encoding the first video image (IMBL) and transmitting the encoded first video image (IMBL), the second transfer function (LUTfinal) and the encoded difference.