Grass Valley 8981NR - Manual (Page 24)

24 8981NR Instruction Manual
Configuration
Noise Filters
The Noise Filters page ( Figure 9 on page 25 ) provides the controls for
turning on and adjusting noise filtering and enabling the display bar and
split screen and the impulse and random noise generators.
Refer to Configuration Summary on page 13 for an overview of each function
and when to use each filtering type. Table 3 on page 16 also gives a
summary of value ranges, step sizes, default values, etc. for each function.
• Recursive Filter pulldown – turn recursive filtering on or off.
With recursive filtering on, the following recursive noise controls can
be set:
• Noise Threshold – set the amount of noise threshold in percent.
• Coefficient – set the noise recursive coefficient.
These controls will be grayed out when the Recursive Filter is off.
• Median Filter pulldown – turn median filtering on or off.
The following controls can be enabled for use with the noise filters:
• Display Bar – enables a sliding horizontal white bar to indicate the rela-
tive value for noise threshold (top) and recursive coefficient (bottom)
on a black background.
• Split Screen – allows the output to be split for comparing the unproc-
essed video data on the right to the processed video on the left.
• Random Noise Generator – adds a pseudo-random, wide-band noise to the
input. Can be used for experimenting with the noise threshold and
recursion coefficient controls. Most actual noise sources will be lower
than with this generator and will require lower settings.
• Impulse Noise Generator – adds a positive, single pixel impulse to the noise
generator output. The random noise generator must also be enabled.
Useful for testing the median filter.
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