Dalsa C1240, User Manual, Page: 99 / 327

Nano Series GigE Vision Camera On-Semi Sensor Models • 89
Overview of Global Reset Release (GRR) Exposures
Referring to the following graphic:
•
All sensor lines start integrating at the same time, therefore GRR mode is also known as
Global Start Mode.
• The first sensor line (line 1) only is exposed for the programmed time integration period.
•
The sensor design uses a shared line readout circuit. Therefore again, only a single line of
pixel data can be readout at any given time.
•
With each sensor line starting exposure integration at once, each following line’s exposure is
increased by the readout time required by the previous row.
•
In a well-lit environment with static objects, there is a visible exposure increase from the
top sensor row to the bottom sensor row.
•
With moving objects in a well-lit environment, there is motion blurring from top to bottom.
•
Therefore as described previously, flash lighting in a dark environment is used to freeze
motion. The flash period matches the integration period for line 1. The increasing exposures
for the other sensor lines will not be visible without any other illumination source.
•
Use a Genie Nano output signal for flash control as described above.