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.
Claims9
A video encoding method of subjecting an input video signal to motion compensation predictive encoding by using a reference picture for an input video signal having a luminance signal and two color difference signals and a motion vector between the input video signal and the reference picture, comprising:
- selecting one combination, for each block of the input video signal, from a plurality of combinations of predictive parameters prepared in advance for each of the luminance signal and two color difference signals and including a weighting factor and offset information;
- generating a prediction picture signal in accordance with at least one designated reference picture number and the predictive parameters of the selected combination, the generating the prediction picture signal including calculating a linear sum of the reference picture signal indicated by the designated reference picture number according to the weighting factor, and adding the offset to the linear sum;
- generating a prediction 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, the designated reference picture number, and index information indicating the selected combination.
A video encoding apparatus of subjecting an input video signal to motion compensation predictive encoding by using a reference picture for an input video signal having a luminance signal and two color difference signals and a motion vector between the input video signal and the reference picture, comprising:
- a selecting unit configured to select one combination, for each block of the input video signal, from a plurality of combinations of predictive parameters prepared in advance for each of the luminance signal and 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 at least one designated reference picture number and the predictive parameters of the selected combination, the generating unit having a function for calculating a linear sum of the reference picture signal indicated by the designated reference picture number according to the weighting factor, and adding the offset to the linear sum;
- a generating unit configured to generate a prediction error signal representing an error between the input video signal and the prediction picture signal;
- and
- an encoding unit configured to encode the predictive error signal, information of the motion vector, the designated reference picture number, and index information indicating the selected combination.
A computer readable storage medium storing instructions of a computer program which when executed by a computer results in performance of steps comprising:
- selecting one combination, for each block of an input video signal having a luminance signal and two color difference signals, from a plurality of combinations of predictive parameters prepared in advance for each of the luminance signal and two color difference signals and including a weighting factor and offset information;
- generating a prediction picture signal in accordance with at least one designated reference picture number and the predictive parameters of the selected combination, the generating the prediction picture signal including calculating a linear sum of the reference picture signal indicated by the designated reference picture number according to the weighting factor, and adding the offset to the linear sum;
- generating a prediction error signal representing an error between the input video signal and the prediction picture signal;
- and
- encoding the predictive error signal, information of a motion vector between the input video signal and the reference picture, the designated reference picture number, and index information indicating the selected combination.
Dependencies are inferred from the claim text.