User`s manual

Operation and Features
3-18 BASLER A101f
DRAFT
3.10 Low Smear
In applications where a
CCD sensor is under con-
stant illumination, high-
contrast images may
show smearing. Smear-
ing is an unwanted effect
that converts dark pixels
into brighter ones. With
the help of the low smear
feature on the A101
f,
smearing is reduced on
the upper part of the im-
age. The effect of the low
smear feature is illus-
trated in Figure 3-15.
The low smear feature
cannot be activated or de-
activated. Low smear is
active all of the time, how-
ever, the feature operates
best at lower frame rates.
A two step process must be used to calculate the maximum frame rate that you can use and still
see the full effect of the low smear feature. First, you must use this formula to calculate the frame
transfer time based on the size of the area of interest (AOI):
where: T(f) = frame transfer time
AOIH = number of rows in the AOI
Second, you must use this formula to calculate the maximum allowed frame:
where: T(f) = frame transfer time
AOIH = number of rows in the AOI
AOIT = number of rows above the AOI
T(e) = exposure time
Figure 3-15: Full Smear (left), Low Smear (right)
T(f) 43 µs [ (1029 - AOIH) x 5.44 µs ] [ (AOIH + 1) x 80.05 µs ] 0.1 µs+++=
Frames/sec.
1,000,000 µs
T(f) [ (AOIH + AOIT) x 7.1 µs ] T(e)++
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