METHOD AND DEVICE FOR INTERPOLATING IMAGES BY USING A SMOOTHING INTERPOLATION FILTER

摘要

Provided are a method of interpolating an image by determining interpolation filter coefficients, and an apparatus for performing the same. The method includes: differently selecting an interpolation filter, from among interpolation filters for generating at least one sub-pel-unit pixel value located between integer-pel-unit pixels, based on a sub-pel-unit interpolation location and a smoothness; and generating the at least one sub-pel-unit pixel value by interpolating, using the selected interpolation filter, pixel values of the integer-pel-unit pixels.

主权项

1. An apparatus for motion compensation, the apparatus comprising:
a luma interpolation filtering unit 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 of the current block, and generating a luma sample of a 2/4-pixel location included in the luma reference block by applying an 8-tap filter to luma samples of a integer pixel location of the luma reference picture; and a chroma interpolation filtering unit which is configured for determining, in a chroma reference picture, a chroma reference block for prediction of fa current block, by using a chroma motion vector of the current block, and generating at least one chroma sample of at least one of ⅛, 2/8 and ⅜-pixel locations included in the chroma reference block by applying a 4-tap filter to chroma samples of a integer pixel location of the chroma reference picture, wherein the 8-tap filter comprises eight filter coefficients, and the 4-tap filter comprises four filter coefficients.