Filter prediction based on activity metrics in video coding

摘要

This disclosure describes techniques associated with filtering of video data in a video encoding and/or decoding process. In accordance with this disclosure, filtering is applied at an encoder, and filter information is encoded in the bitstream to identify the filtering that was applied at the encoder. Different types of filtering may be applied based on an activity metric determined for the video data. Moreover, in accordance with this disclosure, the manner in which the filter information is encoded into the bitstream may be dependent on the activity metric. In particular, for a first range of the activity metric, one or more filters are encoded directly, and for a second range of the activity metric, one or more filters are predictively encoded.

主权项

1. A method of coding video data, the method comprising:
coding a unit of the video data; and coding information for different filters associated with a filtering of pixel data of the coded unit, the different filters being defined for the coded unit based on different values of an activity metric that quantifies activity associated with one or more sets of pixels within the coded unit, the coding of the information for the different filters comprising:
directly coding, for filter information, the information of one or more of the different filters for a first range of values of the activity metric, andpredictively coding, for the filter information, the information of one or more of the different filters for a second range of values of the activity metric by using predictive filter coefficients and residual filter coefficients.