Point Grey Flea3 GigE Technical Reference
8 Flea3 GigE Attributes
The terms “integration”, “exposure” and "shutter" are interchangeable.
The time between the end of shutter for consecutive frames is always constant. However, if the shutter time is
continually changing (e.g. being controlled by Auto Exposure), the time between the beginning of consecutive
integrations will change. If the shutter time is constant, the time between integrations will also be constant.
The camera continually exposes and reads image data off of the sensor under the following conditions:
1. The camera is powered up; and
2. The camera is in free running, not asynchronous trigger, mode. When in trigger mode, the camera simply clears
the sensor and does not read the data off the sensor.
The camera continues to expose images even when data transfer is disabled and images are not being streamed to the
computer. The camera continues exposing images in order to keep things such as the auto exposure algorithm (if
enabled) running. This ensures that when a user starts requesting images, the first image received is properly exposed.
When operating in free-running mode, changes to the shutter value take effect with the next captured image, or the
one after next. Changes to shutter in asynchronous trigger mode generally take effect on the next trigger.
To adjust shutter:
n
GenICam—
Acquisition Control
n
FlyCapture API—
Setting Shutter Using the FlyCapture API
To enable extended shutter:
n
FlyCapture SDK example program—
ExtendedShutterEx
8.10 Gain
Gain is the amount of amplification that is applied to a pixel by the A/D converter. An increase in gain can result in a
brighter image but also an increase in noise.
The Flea3 GigE supports Automatic and One Push gain modes. The A/D converter provides a PxGA gain stage (white
balance/preamp) and VGA gain stage. The main VGA gain stage is available to the user, and is variable between models
per the table below.
Model
Range
FL3-GE-03S1M-C
0 dB to 24 dB
FL3-GE-03S1C-C
0 dB to 24 dB
FL3-GE-03S2M-C
0 dB to 24 dB
FL3-GE-03S2C-C
0 dB to 24 dB
FL3-GE-08S2M-C
0 dB to 24 dB
FL3-GE-08S2C-C
0 dB to 24 dB
FL3-GE-13S2M-C
0 dB to 24 dB
Revised 10/29/2013
Copyright ©2010-2013 Point Grey Research Inc.
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