X
O
X
X
00
00
00
00
01
02
03
04
05
06
00
00
00
00
01
02
03
04
05
06
10
10
10
10
11
12
13
14
15
16
20
20
20
20
21
22
23
24
25
26
30
30
30
30
31
32
33
34
35
36
40
40
40
40
41
42
43
44
45
46
FrameBuffer
Input Frame
I
Spatial
Filter
Output
Frame
I
o
D
HH
N
f
Noise Level
Estimation
spatial_strength
N
noise_IIR_coefficient
+
D
Motion Detection
-
Reference Frame
(Previous Output Frame)
I
p
Blending
factor
α
Spatiall
y
Filtered
Frame
I
s
Motion
m
temporal_strength
temporal_filter_trigger_noise
+
X
Internal Modules
186
SPRUHI7A – December 2012 – Revised June 2016
Copyright © 2012–2016, Texas Instruments Incorporated
High-Definition Video Processing Subsystem (HDVPSS)
Figure 1-133. Noise Filter Architecture Block Diagram
1.2.10.3.1 Spatial Filter
The algorithm kernel size of the spatial filter is 3 (row) x 7 (column). With edge pixels replicated as shown
in
, a 3x7 sliding window is used to process the entire 32x32 tile.
Figure 1-134. Top-left Corner of a Tile After the Boundary Replication
For each 3x7 input, one pixel comes out as output as shown in
.
3x7 Pixel Output
For U and V channels, this filtering needs to be performed only at even rows and even columns due to the
4:2:0 format.