Edje-2000
Real Time MPEG 2 Streaming Encoder
Version 1.3
Adtec Digital, Inc. USA
Page 21 of 21
Vertical Spatial Filter (VSF)
The video encoder provides a vertical filter for reducing spatial noise in the
vertical direction. The vertical filter is also used for chrominance sub
sampling (4:2:2 to 4:2:0 input chroma format conversion). Adtec currently
uses the IBM coefficient values when setting VSF.
This filter uses a 4-tap filter for luminance pixel values and a 5-tap polyphase
filter for chrominance pixel values.
VSF Luminance Table
Option Tap 0
Tap1
Tap 2
Tap 3
0
Off
Off
Off
Off
1
66
124
66
0
2
18
156
87
- 5
3
18
156
87
- 5
4
46
110
84
16
VSF Chrominance to be documented later
Note: VSF cannot be adjusted while encoding.
Vertical Temporal Filter (VTF)
The video encoder can temporally [over time] filter input pixel data using
its 2-tap temporal filter. The 2-tap filter allows pixel values of the current
incoming picture to be weighted against the corresponding pixel values
of the previous input picture. Adtec currently uses the IBM coefficient
values when setting VTF.
VTF Configuration Table
Option 1
2
3
4
0
164
7
7
7
1
164
7
6
5
2
164
7
5
4
3
164
7
4
3
4
164
6
3
2
Note: VTF can be adjusted while encoding.
Vertical Offset
Set the vertical offset to capture Vertical Blanking Lines
.
Currently only used to support Adtec Closed Captioning by setting
Vertical Offset to 1
