Video encoding/decoding method and apparatus
AssigneeKabushiki Kaisha Toshiba
InventorsTAKESHI CHUJOH, Shinichiro Koto, Yoshihiro Kikuchi
Life of this patent
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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.
Claims9
A video decoding method comprising;
- decoding encoded data including (a) index information representing a prediction error signal representing an error of a prediction image signal with respect to a video signal having a luminance signal and two color difference signals, (b) motion vector information, (c) at least one reference picture number and (d) index information indicating combination of predictive parameters prepared for each of the luminance signal and the two color difference signals and including a weighting factor and offset information;
- generating a prediction picture signal in accordance with the reference picture number and the predictive parameter of combination indicated by the decoded index information, the generating the prediction picture signal including calculating a linear sum of the reference picture signal indicated by the decoded reference picture number, according to the weighting factor, and adding the offset to the linear sum;
- and
- generating a reconstructed video signal by using the prediction error signal and the prediction signal.
A video decoding apparatus comprising;
- a decoding unit configured to decode encoded data including a prediction error signal representing an error of a prediction image signal with respect to a video signal having a luminance signal and two color difference signals, motion vector information, at least one reference picture number, and index information representing combination of predictive parameters prepared for each of the luminance signal and the two color difference signals and including a weighting factor and offset information;
- a generating unit configured to generate a prediction picture signal in accordance with the reference picture number and the predictive parameters of combination indicated by the decoded index information, the generating unit including a function for calculating a linear sum of the reference picture signal indicated by the decoded reference picture number, according to the weighting factor, and adding the offset to the linear sum;
- and
- a generating unit configured to generate a reconstructed video signal by using the prediction error signal and the prediction signal.
A computer readable storage medium storing instructions of a computer program which when executed by a computer results in performance of steps comprising:
- decoding encoded data including index information representing a prediction error signal representing an error of a prediction image signal with respect to a video signal having a luminance signal and two color difference signals, motion vector information, at least one reference picture number, and index information indicating combination of predictive parameters prepared for each of the luminance signal and the two color difference signals and including a weighting factor and offset information;
- generating a prediction picture signal in accordance with the reference picture number and the predictive parameter of combination indicated by the decoded index information, the generating the prediction picture signal including calculating a linear sum of the reference picture signal indicated by the decoded reference picture number, according to the weighting factor, and adding the offset to the linear sum;
- and
- generating a reconstructed video signal by using the prediction error signal and the prediction signal.
Dependencies are inferred from the claim text.