Image Acquisition Control AW00123402000
112 Basler ace USB 3.0
6.6 Electronic Shutter Operation
All ace cameras are equipped with imaging sensors that have an electronic shutter. There are two
types of electronic shutter modes used in the sensors: global and rolling (with the variants electronic
rolling and global reset release).
All ace models except the acA1920-25um/uc, acA2500-14um/uc, acA3800-14um/uc, and
acA4600-14uc use sensors with only global shutter modes.
The acA1920-25um/uc, acA2500-14um/uc, acA3800-14um/uc, and acA4600-14uc models use
sensors that support two shutter modes, the electronic rolling shutter mode and the global reset
release shutter mode.
The following sections describe the differences between the shutter modes.
6.6.1 Global Shutter (All Cameras Except acA1920-25,
acA2500-14, acA3800-14, acA4600-10)
All camera models other than the acA1920-25um/uc, acA2500-14um/uc, acA3800-14um/uc, and
acA4600-14uc are equipped with an electronic global shutter. On cameras equipped with a global
shutter, when frame acquisition is triggered, exposure begins for all lines in the sensor as shown in
Figure 49. Exposure continues for all lines in the sensor until the programmed exposure time ends
(or when the frame start trigger signal ends the exposure time, if the camera is using the trigger
width exposure mode). At the end of the exposure time, exposure ends for all lines in the sensor.
Immediately after the end of exposure, pixel data readout begins and proceeds in a linewise fashion
until all pixel data is read out of the sensor.
A main characteristic of a global shutter is that for each frame acquisition, all of the pixels in the
sensor start exposing at the same time and all stop exposing at the same time. This means that
image brightness tends to be more uniform over the entire area of each acquired image, and it helps
to minimize problems with acquiring images of objects in motion.
The cameras can provide an exposure active output signal that will go high when the exposure time
for the first line begins and will go low when the exposure time for the last line ends.
You can determine the readout time for a frame by checking the value of the camera’s Sensor
Readout Time parameter.
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