8.Features
© 2023 China Daheng Group, Inc. Beijing Image Vision Technology Branch 74
Electronic Rolling Shutter
Exposure time
Readout time
Exposure line by line
Readout after exposure
Reading
Time
Exposing
Figure 8-28 Electronic rolling shutter
Global Reset Release Shutter
As the sensor starts exposure line by line, all of the pixels in the sensor start exposing at the same time.
However, the end time of upper lines and lower lines of the same frame of image is different when capturing
fast moving objects, so the distortion will occur. The Global Reset Release (GRR) shutter mode can
effectively avoid the distortion. If the camera is operated in the GRR shutter mode, you must use flash
lighting.
Exposure time
Readout time
All lines are exposuring at the same time
Readout after exposure
Reading
Time
Exposing
Figure 8-29 Global Reset Release shutter
The implementation process of electronic rolling shutter is as shown in Figure 8-28, different from the
global shutter, electronic rolling shutter exposures from the first line, and starts the second line exposure
after a row period. And so on, after N-1 line, the N line starts exposing. When the first line exposure ends,
it begins to read out the data, and it need a row period time to read out one line (including the line blanking
time). When the first line reads out completely, the second line just begins to read out, and so on, when
the N-1 line is read out, the N line begins to read out, until the whole image is read out completely.
The electronic rolling shutter has low price and high resolution, which is a good choice for some static
image acquisition.
