Point Grey Flea3 FL3-U3 - 7.3 Gain

Point Grey Flea3 USB 3.0 Technical Reference 7 Imaging Parameters and Control
Field Bit Description
A_M_Mode [7]
Read: read a current mode
Write: set the mode
0: Manual, 1: Automatic
[8-19] Reserved
Value [20-31]
Value.
A write to this value in ‘Auto’ mode will be ignored.
7.2.2 Example: Setting Brightness Using the FlyCapture API
The following FlyCapture 2.0 code snippet adjusts brightness to 0.5% using the C++ interface. The snippet assumes a
Camera object cam.
//Declare a Property struct.
Property prop;
//Define the property to adjust.
prop.type = BRIGHTNESS;
//Ensure the property is set up to use absolute value control.
prop.absControl = true;
//Set the absolute value of brightness to 0.5%.
prop.absValue = 0.5;
//Set the property.
error = cam.SetProperty( &prop );
7.3 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 camera 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 up to 24 dB in
steps of 0.046 dB. On FL3-U3-13Y3, gain is variable up to 18 dB.
Increasing gain also increases image noise, which can affect image quality. To increase
image intensity, try adjusting the lens aperture (iris) and shutter time (page 111) first.
Auto/one-push gain control is only supported in free-running trigger mode.
Revised 9/27/2012
Copyright ©2011-2012 Point Grey Research Inc.
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