Smartek Vision Giganetix GC Series User Manual page 112

Table 43 shows the read-out time t
Table 43: Read out time ( t
Due to the fact that the exposure duration of each line is shifted, each of them catches a different moment
of the scene, what leads to unwanted effects especially in moving scenes. This effects can be reduced or
completely removed in many cases by creating a controlled illumination situation.
Eliminating Rolling Shutter Effects
In many cases a strobe illumination or mechanical shutter can help to remove the rolling shutter effect in
moving scenes by putting light onto the sensor only while all lines are within integration. Figure 89 shows
this illumination window as t
Frame
Start
Line 1
Line 2
Line 3
Line 4
Line 5
Line 6
Line 7
Line 8
Line N-1
Line N
t
for the default image width of each CMOS model.
ReadRow
Model
GC1281
GC2041
GC2591
GC3851
, staring at t
Illumination
t
Exposure
t
ReadRow
IlluminationDelay
Figure 89: Electronic Rolling Shutter Frame Readout
t
ReadRow
31.75
53.31
36.38
23.09
) per line for CMOS Sensors (ERS)
ReadRow
.
IlluminationDelay
t
Illumination
106
4 Image Acquisition
s
µ
s
µ
s
µ
s
µ
t
FrameReadout
t
ReadRow
Exposure Readout
SMARTEK Vision Giganetix User Manual Version 2.1.4
t