US 10,542,264 B2 · Memory reduction implementation for weighted angular prediction

Abstract

A method and apparatus for decoding JVET video, including receiving a bitstream and generating predictor pixels for angular prediction using pixels at projected positions along both a top reference row (main reference line) and a left reference column (side reference line). By combining projected pixel values on the main reference line with projected pixel values on the side reference, a predictor pixel at coordinate (x,y) can be determined. Further weighting the values according to a distance between predictor pixels and projected pixel positions on the main and side references may be included in the combination of pixel values. The weight parameter may be determined from a weighting table. Further, the weights for horizontal and vertical predictors may be computed based on that of a horizontal and vertical predictor, whichever is more accurate.

Claims15

Dependent claims

An apparatus for coding video data by generating predictor pixels for angular prediction using pixels at projected positions on both top reference row and left reference column positions, the apparatus comprising one or more processors configured to:

receive a bitstream comprising video data;
select an intra direction mode for coding at least a portion of the video data, wherein the intra direction mode is a first intra direction mode in a plurality of intra direction modes that includes at least one weighted intra direction mode;
and
predict a pixel at coordinate(x,y) in accordance with P[x,y]=((((x+1)*Recon[x+y+2,−1])+((y+1)*Recon[−1,x+y+2]))*S[x+y+2]+(y+x+2)/2)>>>ShiftDenom),
wherein Recon[0,0] is a reconstructed pixel at top left coordinate (0,0) of a current coding node, S[n] is a weight parameter determined from a weighting table, and ShiftDenom is a factor for a shifted down operation.

2 more elements

receive a bitstream comprising video data;
select an intra direction mode for coding at least a portion of the video data, wherein the intra direction mode is a first intra direction mode in a plurality of intra direction modes that includes at least one weighted intra direction mode;
and
predict a pixel at coordinate (x,y) in accordance with
P
⁡
[
x
,
y
]
=
(
(
(
horWeight
*
Recon
⁡
[
x
+
y
+
2
,
-
1
]
)
+
(
verWeight
*
Recon
⁡
[
-
1
,
x
+
y
+
2
]
)
+
(
y
+
x
+
2
)
/
2
)
⪢
ShiftDenom
)
,
wherein
⁢
⁢
horWeight
=
{
(
1
⪡
ShiftDenom
)
-
verWeight
when
⁢
⁢
x
<
y
(
y
+
1
)
*
S
⁡
[
x
+
y
+
2
]
otherwise
,
and
wherein
⁢
⁢
verWeight
=
{
(
x
+
1
)
*
S
⁡
[
x
+
y
+
2
]
when
⁢
⁢
x
<
y
(
1
⪡
ShiftDenom
)
-
horWeight
otherwise
,
wherein Recon[0,0] is a reconstructed pixel at top left coordinate (0,0) of a current coding node, S[n] is a weight parameter determined from a weighting table, and ShiftDenom is a factor for a shifted down operation.

133 more elements

receive a bitstream comprising video data;
select an intra direction mode for coding at least a portion of the video data, wherein the intra direction mode is a first intra direction mode in a plurality of intra direction modes that includes at least one weighted intra direction mode;
and
predict a pixel at coordinate (x,y) in accordance with
P
⁡
[
x
,
y
]
=
(
(
(
horWeight
*
Recon
⁡
[
x
+
y
+
2
,
-
1
]
)
+
(
verWeight
*
Recon
⁡
[
-
1
,
x
+
y
+
2
]
)
+
(
y
+
x
+
2
)
/
2
)
⪢
ShiftDenom
)
wherein
⁢
⁢
horWeight
=
{
(
1
⪡
ShiftDenom
)
-
verWeight
when
⁢
⁢
x
<
y
(
y
+
1
)
*
S
⁡
[
x
+
y
-
1
]
otherwise
,
and
wherein
⁢
⁢
verWeight
=
{
(
x
+
1
)
*
S
⁡
[
x
+
y
-
1
]
when
⁢
⁢
x
<
y
(
1
⪡
ShiftDenom
)
-
horWeight
otherwise
,
wherein Recon[0,0] is a reconstructed pixel at top left coordinate (0,0) of a current coding node, S[n] is a weight parameter determined from a weighting table, and ShiftDenom is a factor for a shifted down operation.

132 more elements

Dependencies are inferred from the claim text.

Memory reduction implementation for weighted angular prediction

Life of this patent

Memory reduction implementation for weighted angular prediction

Life of this patent

Abstract

Claims15