Video encoding/decoding method and apparatus
AssigneeKabushiki Kaisha Toshiba
InventorsTakeshi Chujoh, Shinichiro Koto, Yoshihiro Kikuchi
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Abstract
A video encoding method comprises selecting one combination, for each block of an input video signal, from a plurality of combinations each including a predictive parameter and at least one reference picture number determined in advance for the reference picture, generating a prediction picture signal in accordance with the reference picture number and predictive parameter of the selected combination, generating a predictive error signal representing an error between the input video signal and the prediction picture signal, and encoding the predictive error signal, information of the motion vector, and index information indicating the selected combination.
Claims1
A prediction image generation method for generating a prediction image by decoding encoded data obtained by subjecting a video image comprising a luminance and two color differences to prediction encoding, comprising:
- a step of receiving an input of encoded data obtained by encoding, for one or more to-be-decoded block, a plurality of combinations comprising (A) a weighting factor every luminance and two color differences, (B) an offset every luminance and two color differences and (C) a flag indicating presence or non-presence of the weighting factor and the offset for two color differences and encoding, for a to-be-decoded block, (1) a quantized orthogonal coefficient of a prediction error signal for luminance and two color differences, (2) information of a motion vector and (3) an index indicating one combination of the plurality of combinations;
- a step of deriving, for the to-be-decoded block, the weighting factor and the offset from the index and the plurality of combinations;
- a step of generating a prediction image by multiplying a reference image by the weighting factor and adding the offset, based on the motion vector;
- a step of generating the prediction error signal by subjecting the quantized orthogonal coefficient to inverse quantization and inverse orthogonal transform;
- and
- a step of generating a decoded image signal by calculating a sum of the prediction error signal and the prediction image.
Dependencies are inferred from the claim text.