Baumer EXG Panduan Pengguna - Halaman 7

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Baumer EXG Panduan Pengguna
2.1.1.1 Global Shutter
Global shutter means that all pixels of the sensor are reset and afterwards exposed for a 
specified interval (t
exposure
For  each  pixel  an  adjacent  storage  area  exists.  Once  the  exposure  time  elapsed,  the 
information  of  a  pixel  is  transferred  immediately  to  its  storage  area  and  read  out  from 
there.
Due to the fact that photosensitive surface get's "lost" by the implementation of the stor-
age area, the pixels mostly are equipped with microlenses, which focus the light to the 
pixels active area.
2.1.1.2 Rolling Shutter
Rolling shutter means that – in contrast to the global shutter – not the whole sensor is 
exposed at once, but single portions successively. It is said the shutter "rolls" over the 
sensor�
For Baumer EXG cameras with rolling shutter this means two pointers are "rolling" across 
the sensor:
▪ First, the reset pointer deletes any information of former exposures stored within the 
pixels (Frame
). After that the pixels are empty and restart collecting information 
(n-1)
from incoming light – the new exposure (Frame
▪ Once a predefined interval – the exposure time t
pointer rolls across the sensor and the information of the pixels is read out.
▪ For example: On Baumer EXG50, the pass of a pointer lasts approx. 72 msec 
(t
).
Full Frame
Notice
Due  to  technical  issues  of  rolling  shutter,  a  flash  control  depending  on  the  exposure 
time does not make sense. Such cameras should be used in a continuously illuminated 
environment.
). 
Pixel
Active Area (Photodiode)
Storage Area
Reset Pointer
Readout Pointer
Pixels of Frame
(n-1)
Currently exposed pixels (Frame
Read out pixels of current Frame (Frame
) begins.
(n)
 – is elapsed, the readout 
exposure
Microlens
◄ Figure 5
Structure of an imaging 
sensor with global shut-
ter (interline).
– will be deleted
◄ Figure 6
)
(n)
Operating mode of a 
)
rolling shutter.
(n)
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