Low Smear - Basler A101f User Manual

Operation and Features

3.10 Low Smear

In applications where a
CCD sensor is under con-
stant illumination, high-
contrast images
show smearing. Smear-
ing is an unwanted effect
that converts dark pixels
into brighter ones. With
the help of the low smear
feature on
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):
T(f)
where:
Second, you must use this formula to calculate the maximum allowed frame:
Frames/sec.
where:
3-18
may
the ,
f
A101
Figure 3-15: Full Smear (left), Low Smear (right)
= 43 µs + [ (1029 - AOIH) x 5.44 µs ]
T(f) = frame transfer time
AOIH = number of rows in the AOI
≤ ------------------------------------------------------------------------------------------------------------ -
T(f) + [ (AOIH + AOIT) x 7.1 µs ]
T(f) = frame transfer time
AOIH = number of rows in the AOI
AOIT = number of rows above the AOI
T(e) = exposure time
DRAFT
+ [ (AOIH + 1) x 80.05 µs ]
1,000,000 µs
+
+ 0.1 µs
T(e)
BASLER A101
f