QUALCOMM Incorporated
Adaptive loop filtering classification in video coding

Abstract:

A video encoder and/or video decoder are configured to apply an adaptive loop filter to a reconstructed block of video data. The video encoder and/or video decoder may be configured to determine gradient values for a window that covers the reconstructed block of video data, determine a scaling factor for the gradient values based on a number of available pixels in the window that are on a same side of a virtual boundary as the reconstructed block, and scale the gradient values based on the scaling factor. The video encoder and/or video decoder may determine a class of adaptive loop filter based on the scaled gradient values.