Method of Filter Control for Block-Based Adaptive Loop Filtering

摘要

A method of adaptive loop filtering with implicit sample-based On/Off control for reconstructed video to improve the performance is disclosed. In one embodiment, each pixel of the video data associated with the reconstructed current image unit is classified into a first group and a second group. Adaptive Loop Filter (ALF) is then applied to these pixels belonging to the first group. For pixels in the second group, ALF is not applied. The image unit may correspond to one coding tree block (CTB) or one coding tree unit (CTU). Various classification means for classifying each pixel into a first group or a second group have also been disclosed. The adaptive loop filtering with implicit sample-based On/Off control may also be used as an additional mode in a system supporting block-based On/Off control.

主权项

1. A method of adaptive loop filtering for reconstructed video in a video encoding system or video decoding system, wherein each picture of the reconstructed video is partitioned into image units, the method comprising:
receiving video data associated with a reconstructed current image unit; and applying Implicit Sample-based On/Off ALF (adaptive loop filter) to the video data, wherein said applying Implicit Sample-based On/Off ALF comprises: classifying each pixel of the video data associated with the reconstructed current image unit into a first group or a second group based on reconstructed video commonly available to both an encoder side and a decoder side; applying adaptive loop filter to the pixels of the video data associated with the reconstructed current image unit belonging to the first group; and skipping the adaptive loop filter for the pixels of the video data associated with the reconstructed current image unit belonging to the second group.