Deblocking filter
View Patent ↗The invention is related to decoding of block wise coded video pictures. The determination of using de-blocking filtering between coded blocks is based on alternative characteristics compared to the characteristics used in H.264/AVC.
1. A method in video decoding for reducing blocking artifacts between at least a first and a second block in a block wise coded video picture, comprising
performing, at a video decoding apparatus, a test of pixel lines crossing a boundary and/or an extension of the boundary between the first and the second blocks, wherein performing the test on the pixel lines includes testing the following relation for said pixel lines
∑
i
=
∈
S
(
a
i
-
2
b
i
+
c
i
+
d
i
-
2
e
i
+
f
i
)
<
β
'
(
QP
)
wherein a is the third closest pixel on the left hand side of the boundary and/or the extension of the boundary, b is the second closest pixel on the left hand side of the boundary and/or the extension of the boundary, c is the closest pixel on the left hand side of the boundary and/or an extension of the boundary, d is the closest pixel on the right hand side of the boundary and/or an extension of the boundary, e is the second closest pixel on the right hand side of the boundary and/or an extension of the boundary and f is the third closest pixel on the right hand side of the boundary and/or an extension of the boundary, i is the line number of lines in the subset S and is greater than 1, and β′(QP) is a threshold value dependent on a first quantization parameter for the video coding.
2. The method of claim 1 , further comprising:
executing a de-blocking filter operation on the boundary neighboring pixels in each of the pixel lines crossing the boundary.