Video encoding method and apparatus, and video decoding method and apparatus using interpolation filter on which image characteristic is reflected
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United States of America Patent
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May 19, 2020
Grant Date -
Jan 25, 2018
app pub date -
Nov 4, 2015
filing date -
Nov 4, 2014
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Abstract
Provided are a video encoding method and apparatus to which an interpolation filter is applied according to characteristics of an image for motion compensation, and a video decoding method and apparatus corresponding thereto. The video encoding method according to various embodiments includes determining a degree of change between neighboring samples of at least one integer pixel unit adjacent to a reference sample of an integer pixel unit of a current sample and the reference sample; determining an interpolation filter among interpolation filters having different frequency passbands and configured to produce reference samples of a sub-pixel unit to predict the current sample, based on the degree of change; determining a predicted sample value of the current sample by using a reference sample of a sub-pixel unit produced by applying the determined interpolation filter; and encoding a residual value between the predicted sample value and a sample value of the current sample.
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