| 摘要 |
FIELD: physics, computer engineering.SUBSTANCE: invention relates to computer engineering. A video encoder for encoding a first frame sequence, sample values of which are presented in a first format which covers a first dynamic range, comprises a converter for converting sample values of frames of the first sequence from the first format to a second format with a second dynamic range using a mapping function which maps a portion of the first dynamic range, set by a mapping parameter, to the second dynamic range to obtain a second frame sequence; a video encoding stage for encoding the second frame sequence through weighted temporal prediction of the first frame of the second sequence using the second frame of the second sequence of the reconstructed version of the second frame of the second sequence, weighted by a weight parameter and shifted by a shifting parameter as a reference frame; and a parameter setting unit for setting the weight parameter and the shifting parameter depending on the mapping parameter of the second frame of the first sequence and setting the mapping parameter of the first frame of the first sequence.EFFECT: high efficiency of shared mapping of the dynamic range and temporal prediction.20 cl, 7 dwg |
