8.Features
© China Daheng Group, Inc. Beijing Image Vision Technology Branch 117
Time
Frame N
Frame N+1
Frame N+2
Frame N
Frame N+1
Sensor
Exposure
Sensor
Readout
Trigger
Trigger
Trigger
Figure 8-19 The trigger acquisition exposure sequence diagram in overlapping exposure mode
Compared with non-overlapping exposure mode, in overlapping exposure mode, the camera can obtain
higher frame rate.
MER-131-210U3M/C(-L) , MER-630-60U3M/C(-L), MER-1070-14U3M/C(-L), MER-1220-
32U3M/C(-L), MER-1520-13U3C(-L), MER-1810-21U3C(-L), MER-2000-19U3M/C(-L), these
cameras only support non-overlapping exposure in trigger mode. When the trigger delay is
less than the frame period, some trigger signals will be shield.
8.2.9. Strobe
Strobe is one of the ways to adjust the brightness of the image, which is a lot different from a global shutter
camera and an electronic rolling shutter camera, especially in strobe control.
All the lines of the global shutter camera are exposed at the same time, and it is simple to supplement
light, and the camera can get the same brightness images as long as the strobe is light during the exposure
of the camera. The width of the flash signal is equal to the exposure time. The width of the flash signal can
be obtained by the following formula:
T
strobe
= T
exposure
The figure below identifies the exposure time of the global exposure product.
strobe
All lines are exposed simultaneously in the sensitive region
All rows of electrons simultaneously
move from the exposure area to the
storage area
Strobe output
Figure 8-20 The relationship between strobe width and exposure time in global shutter mode
