Overview Of Electronic Rolling Shutter (Ers) Exposures - Teledyne m640 User Manual

Genie nano series monochrome & color gige vision area scan
Hide thumbs Also See for m640:
Table of Contents

Advertisement

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.
Nano Series GigE Vision Camera
Genie Nano Series Overview • 43

Advertisement

Table of Contents
loading

Table of Contents