Controlling image capture
PIKE Technical Manual
V5.0.0
217
Smear reduction
Smear reduction: definition
Definition
Smear
is an undesirable CCD sensor artefact creating a vertical bright line
that extends above and below a bright spot in an image.
Definition
Smear reduction
is a function implemented in hardware in the camera itself
to compensate for smear.
Smear reduction: how it works
To reduce smear a reference line is used. This reference line is built from the
mean value of the so-called
black lines
(two lines before image start). The
reference line is subtracted from every line of the whole image.
But how will this reduce smearing?
The point is: black lines have no image information but are also affected from
smearing. Thus the smearing effect itself is isolated and can be reduced in
the whole image.
The two additional black lines and the calculated anti-smear values do not
lower the transfer rates significantly due to hardware implementation.
Smear reduction: switch on/off in register and
SmartView
To switch on/off smear reduction in advanced registers, see Chapter
In SmartView:
Edit settings
Adv3
tab (
Smear reduction
Enable
)
