Edje-2000
Real Time MPEG 2 Streaming Encoder
Version 1.3
Adtec Digital, Inc. USA
Page 19 of 19
Horizontal Spatial Filter (HSF)
The HSF is integrated in to the IBM eNV-encoding engine. It was
intended to re-size images as well as filter out noise spatially (with-in the
image) in the horizontal plane. The filter uses an 8-Tap Polyphase filter
for Luminance and a 4-Tap filter for Chrominance pixel values. Adtec
currently uses the IBM coefficient values when setting HSF.
We plan to implement more documentation and user defined coefficients
in future firmware releases.
Default Luminance Coefficient or noise reduction filter table
Option Tap 0
Tap1
Tap 2
Tap 3
Tap 4
Tap 5
Tap 6
Tap 7
0
Off
Off
Off
Off
Off
Off
Off
Off
1
- 8
- 1
72
126
72
1
- 8
0
2
- 4
- 8
64
152
64
- 8
- 4
0
3
- 2
- 16
64
164
64
- 16
- 2
0
4
- 1
- 16
52
186
52
- 16
- 1
0
5
- 4
18
67
94
67
18
- 4
0
6
- 11
- 12
77
148
77
- 12
- 11
0
Default Chrominance Coefficient or noise reduction filter table
Option Tap 0
Tap1
Tap 2
Tap 3
0
Off
Off
Off
Off
1
64
128
64
0
2
48
160
48
0
3
32
192
32
0
4
32
192
32
0
5
65
126
65
0
6
60
136
60
0
Note: HSF cannot be adjusted while encoding
.
Horizontal Fine Pre-filter (HPF)
Horizontal Fine Pre-Filter works in association with horizontal scaling.
The numbers are empirically based.
0 =
Should be used with bit rates under 1 Mbs as the affect will soften the
picture thus reducing macro blocks.
1 =
Should be used between 1 and 2 Mbs. This will reduce macro blocking
in this bit range and provide a slightly softened image.
2 =
Should be used between 2 and 3 Mbs. This will reduce macro blocking
in this bit range and provide a very slightly softened image.
3 =
This will produce the sharpest image and should be used at bit rates of 3
Mbs and higher.
Note: HPF can be adjusted while encoding
.