8.Features
© China Daheng Group, Inc. Beijing Image Vision Technology Branch 57
8.2.8. Set Exposure
Global Shutter
The implementation process of global shutter is as shown in Figure 8-20, all the lines of the sensor are
exposed at the same time, and then the sensor will read out the image date one by one.
The advantage of the global shutter is that all the lines are exposed at the same time, and the images do
not appear offset and distortion when capturing moving objects.
The time width of the flash signal can be got by the following formula:
T
𝑠𝑡𝑟𝑜𝑏𝑒
= T
𝑒𝑥𝑝𝑜𝑠𝑢𝑟𝑒
Exposure time
Readout time
All lines are exposing at the same time
All lines transfer electrons from
exposure area to storage area
Reading electrons from
storage area line by line
Time
Figure 8-20 Global Shutter
Electronic Rolling Shutter
Exposure time
Readout time
Exposure line by line
Readout after exposure
Reading
Time
Exposing
Figure 8-21 Electronic rolling shutter
