Adaptive filtering method and apparatus based on image characteristic in video coding system

摘要

A method for filtering a reconstructed picture performed by a decoding apparatus according to the present invention comprises the steps of: calculating an activity of an image with respect to a target area of a reconstructed picture; determining a directionality of the image with respect to the target area; Selecting a particular filter in the set of filters based on the selected filter, and performing filtering on the reconstructed picture based on the selected filter. According to the present invention, adaptive filtering can be applied based on an image characteristic of a target block of a reconstructed picture, thereby improving the subjective / objective picture quality of the reconstructed picture.