ADV8003 Hardware Manual
Rev. B, August 2013
343
In DNR mode, it is possible to subtract a fraction of the signal that lies below the set threshold, assumed to be noise, from the original
signal. The threshold is set using
When
is enabled, it is possible to add a fraction of the signal that lies above the set threshold to the original signal
because this data is assumed to be valid data and not noise. The overall effect is that the signal is boosted (similar to using the extended
SSAF filter).
dnr_enable_sharpness
, Encoder Map,
Address 0xE4A5[3]
This bit is used to select the Digital Noise Reduction (DNR) mode.
Function
dnr_enable_sharpness
Description
0
DNR mode
1
DNR sharpness mode
8.4.19.8.
DNR Block Offset Control
allows a shift of the data block of 15 pixels maximum. The coring gain positions are fixed. The block offset shifts the data
in steps of one pixel so that the border coring gain factors can be applied at the same position regardless of variations in input timing of
the data.
blk_offset[3:0]
, Encoder Map,
Address 0xE4A5[7:4]
This signal is used to configure the Digital Noise Reduction (DNR) block offset.
Function
blk_offset[3:0]
Description
0000
Zero pixel offset
0001
One pixel offset
...
1110
14 pixel offset
1111
15 pixel offset
8.4.19.9.
SD Active Video Edge Control
The ADV8003 encoder core is able to control fast rising and falling signals at the start and end of active video in order to minimize
ringing artifacts.
When the active video edge control feature is enabled, the first three pixels and the last three pixels of the active video on the luma
channel are scaled so that maximum transitions on these pixels are not possible. This feature is highlighted in
At the start of active video, the first three pixels are multiplied by 1/8, 1/2, and 7/8, respectively. Approaching the end of active video, the
last three pixels are multiplied by 7/8, 1/2, and 1/8, respectively. All other active video pixels pass through unprocessed.
show the difference between having this feature enabled and disabled. This feature can be enabled using
100 IRE
0 IRE
100 IRE
12.5 IRE
87.5 IRE
0 IRE
50 IRE
LUMA CHANNEL WITH
ACTIVE VIDEO EDGE
DISABLED
LUMA CHANNEL WITH
ACTIVE VIDEO EDGE
ENABLED
06398-
082
Figure 125: Example of Active Video Edge Functionality
Содержание ADV8003
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