US 2017/0302965 A1 · ADAPTIVE DIRECTIONAL LOOP FILTER

Abstract

Adaptive directional loop filtering can reduce the number of blocking artifacts produced by coding a non-perpendicular picture edge in a frame of a video sequence. A directional filter is selected from a set of directional filters based on one of an orientation of the non-perpendicular picture edge or filter data included as part of an encoded video sequence in association with the frame. The selection can include selecting a directional filter based on a directional intra prediction mode used for encoding the block, a filter angle most closely matching an angle explicitly signaled as part of the video sequence, the incremental reduction of the number of blocking artifacts, a threshold value for blocking artifacts, or a frequency of filter use. Each directional filter of the set of directional filters can have a filter angle between 0 and 180 degrees, exclusive.

Claims20

Dependent claims

An apparatus, comprising:

at least one processor configured to execute instructions stored in a non-transitory storage medium to:
identify, in a frame of an encoded video sequence, a picture edge that is non-perpendicular with respect to a boundary of a current block of the frame;
select a directional filter from a set of directional filters based on filter signaling data included as part of the encoded video sequence in association with the frame, each directional filter having a respective filter angle;
and
apply the selected directional filter to the picture edge.

2 more elements

An apparatus, comprising:

at least one processor configured to execute instructions stored in a non-transitory storage medium to:
identify, in a current block of a frame, a group of pixels defining a picture edge that is non-perpendicular with respect to a boundary of the current block;
select a directional filter from a set of directional filters based on an orientation of the picture edge, each directional filter having a respective filter angle;
and
apply the selected directional filter to the picture edge during an encoding or decoding of the frame.

2 more elements

A method for encoding or decoding a video signal using a computing device, the video signal including frames defining a video sequence, the frames having blocks, and the blocks having pixels, the method comprising:

identifying, in a current block of a current frame of the video sequence, a group of pixels defining a picture edge that is non-perpendicular with respect to a boundary of the current block;
selecting a directional filter from a set of directional filters based on one of an orientation of the picture edge or filter signaling data included as part of an encoded video sequence in association with the current frame, each directional filter having a filter angle;
and
applying the selected directional filter to the picture edge during an encoding or decoding of the frame.

1 more element

Dependencies are inferred from the claim text.

Adaptive directional loop filter

Life of this patent

Adaptive directional loop filter

Life of this patent

Abstract

Claims20