IMAGE CODING METHOD, IMAGE DECODING METHOD, IMAGE CODING APPARATUS, AND IMAGE DECODING APPARATUS

摘要

The present invention aims to reduce a memory bandwidth during image coding. An image coding method includes an acquiring step and a generating step. The 5 acquiring step includes acquiring a reference image. The generating step includes generating a predicted image having resolution larger than that of the reference image, by performing an interpolation to the acquired reference image according to a motion vector for each of the 10 luminance component and the color difference component. The generating step includes generating the predicted image having the color difference component without performing a specific interpolation that means the interpolation processing in which a number of pixels to be accessed in 15 the reference image is large, when a size of a block designated as a unit of the interpolation is smaller than a predetermined threshold value. (l LO ) >- 0 z: 0 <- 0 F < 0 K0 zJ < ID ID( 0 I z~ I < Iu - I<( U D (- 0 ozzu < < a0 > a J c U (D -U oc IL < (90 ~ z 0 Z (D z a 2 LD < , Dz