Method and apparatus for performing interpolation based on transform and inverse transform

摘要

Provided are a method and apparatus for interpolating an image. The method includes: selecting a first filter, from among a plurality of different filters, for interpolating between pixel values of integer pixel units, according to an interpolation location; and generating at least one pixel value of at least one fractional pixel unit by interpolating between the pixel values of the integer pixel units by using the selected first filter.

主权项

1. An apparatus for motion compensation, the apparatus comprising:
a processor which is configured for determining, in a luma reference picture, a luma reference block for prediction of a current block by using a luma motion vector, generating a luma sample of a 2/4-pixel location by applying an 8-tap interpolation filter to luma samples of an integer pixel location of the luma reference picture, and generating a luma sample of a ¼-pixel location or a ¾-pixel location included in the luma reference block by applying an interpolation filter to the luma samples of the integer pixel location of the luma reference picture without using the generated luma sample of the 2/4-pixel location, wherein the processor is configured for determining, in a chroma reference picture, a chroma reference block for prediction of the current block by using a chroma motion vector, and generating a chroma sample of a 4/8-pixel location included in the chroma reference block, by applying a 4-tap interpolation filter to chroma samples of an integer pixel location of the chroma reference picture, the 8-tap interpolation filter comprises eight filter coefficients, and the 4-tap interpolation filter comprises four filter coefficients.