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CPP100
SECTION 9
CPP1OPS
25/10/06
www.snellwilcox.com
Version 1 Issue 6
9.15
Scratch Filter
Introduction
This filter has been designed to detect and repair vertical scratches, of variable contrast and length, be they
black, white or both, while maintaining picture quality where there are no scratches. To maximise the benefit
obtained from this filter, a suite of filter strengths has been provided.
Operation
Control parameters for the scratch filter can be found under the SCRATCH menu as shown below:
Scratch Filter - On/Off
For unscratched material, it makes sense to turn the scratch filter off.
In order to remove scratches, it is necessary to enable the scratch filter.
Strength
There are three
Filter Strengths
available, and they are denoted as
Min
,
Med
and
Max
.
By increasing the strength of the filter, the potential for detecting and removing more scratches is improved.
While the probability of false alarms is small, increasing the filter strength increases the probability of false
alarms. Thus, when choosing the filter strength for a certain piece of footage, the smallest filter strength that is
sufficient to cope with its scratches should be chosen, thus minimising the number of unrepaired scratches as
well as false alarms, while maintaining maximum picture quality.
FILTERS
SCRATCH
TYPE
STRENGTH
SCRATCH
CONTRAST
LENGTH
Any
Long
Low
Med
High
Min
Med
Max
Both
White
Black