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GX1660 User Manual
70-0057A-A
Allied Vision Technologies (Canada) Inc.
34
Iris
The GC series cameras support video-type auto iris lenses. This control will not appear on GE series cameras
which do not support auto iris.
All video-type auto iris lenses have a default reference voltage. When a voltage larger than this reference
voltage is applied to the lens, the iris closes. When a voltage is applied less than this reference voltage, the
iris opens. The auto iris algorithm calculates the appropriate voltage, IrisVideoLevel, to apply to the lens,
based on the brightness of the current image vs. the IrisAutoTarget.
NOTE: The camera must be acquiring images in order for the auto iris algorithm to update.
IrisAutoTarget – In percent. Controls the general lightness or darkness of the auto iris feature;
specifically the target mean histogram level of the image, 0 being black, 100 being white.
IrisMode – Sets the auto-iris mode
Disabled – Turn off the video auto-iris function.
Video – Turn on the video auto-iris function.
VideoOpen – Fully open the iris.
VideoClosed – Full close the iris.
IrisVideoLevel – In 10 mV units. This attribute reports the strength of the video signal coming from the
camera.
IrisVideoLevelMax - In 10 mV units. Limits the maximum driving voltage for closing the lens iris.
Typically this will be 150, however it may vary dependent on the lens reference voltage.
IrisVideoLevelMin - In 10 mV units. Limits the minimum driving voltage for opening the lens iris.
Typically this will be 0.
WhiteBalance
Auto
The following parameters are used to control the way that the Auto whitebalance function operates.
WhitebalAutoAdjustDelay - Currently unimplemented.
WhitebalAutoAdjustTol - A threshold. This parameter sets a range of scene color changes in which
the automatic whitebalance will not respond. This parameter can be used to limit whitebalance setting
changes to only larger variations in scene color.
WhitebalAutoAlg - The whitebalance algorithm is fixed as "Mean", that is, the algorithm uses the
mean histogram value for the red and blue channels in its calculations.
WhitebalAutoRate - In percent. Determines how fast the Auto Whitebalance updates.
WhitebalMode
Manual – Auto whitebalance is off. Whitebalance can be adjusted directly by changing the
WhitebalValueRed and WhitebalValueBlue parameters.
Auto - Whitebalance will continuously adjust according to the current scene. The Auto function
operates according to the Auto and DSP controls
AutoOnce – A command (of type Enumeration in PvAPI). A single iteration of the auto whitebalance
algorithm is run, and then the camera reverts to Manual WhitebalMode. The AutoOnce function
operates according to the Auto and DSP controls