Dalsa Genie Nano Series User Manual

88 • On-Semi Sensor Models Nano Series GigE Vision Camera
Overview of Electronic Rolling Shutter (ERS) Exposures
Referring to the following graphic:
• Each sensor line is exposed for the programmed time integration period.
• Exposures start with Line 1. The sensor design uses a shared line readout circuit. Due to
this simplified circuitry, only a single line of pixel data can be readout at any given time.
Therefore the line 2 exposure (integration period) is delayed by the required readout time of
line 1.
• This delayed line exposure is repeated from the sensor’s first line to its last sensor line.
• This sequence allows the common readout circuit to read the data from each row. This
results in an exposure start time delay between the first to last row – thus the name rolling
shutter.
• To avoid motion artifacts the user needs to freeze motion using flash lighting of suitable
length in a dark environment. The flash is triggered at the start of the last line’s exposure
and stops at the end of the first line’s exposure. The flash must maintain a constant light
output during this period.
• To control the flash device, use the Genie Nano output signal with these feature selections:
outputLineSource=PulseOnStartofExposure, outputLinePulseDelay=flashZoneDelay (delay to
the start of the last line exposure), outputLinePulseDuration=flashZoneDuration (optimal
flash zone time as shown in the graphic below).
• The two new features mentioned, flashZoneDelay and flashZoneDuration, automatically
provide the optimal flash zone time values no matter the exposure duration and any vertical
cropping/offset settings. The user is free to use any delay or duration as required.
• The dark environment illumination ensures minimal exposure (and thus motion artifacts)
during the sensor lines integration time occurring before and after the flash period.

Dalsa Genie Nano Series Specifications

General

Brand	Dalsa
Model	Genie Nano Series
Category	Security Camera
Language	English