Prediction image generation method, image reconstruction method, prediction image generation device, image reconstruction device, prediction image generation program, image reconstruction program and recording medium

摘要

PROBLEM TO BE SOLVED: To provide a prediction image generation method capable of improving encoding efficiency or decoded video quality.SOLUTION: A prediction image generation method for further performing residual prediction to an image generated by inter-screen prediction from a reference picture in the case of generating a prediction image by performing prediction to a prediction target region includes: a primary prediction image generation step of generating a primary prediction image by inter-screen prediction from the reference picture; a residual prediction step of generating a prediction predictive residual by inter-screen prediction from a different reference picture; a prediction image generation step of generating a prediction image from the primary prediction image and the prediction predictive residual; and a prediction image update step of generating a new prediction image by updating the prediction image.