GX3300 Technical Manual
Page 37
Gain
Auto
This group of controls relates to the camera auto gain function.
NOTE: The camera must be acquiring images in order for the auto gain algorithm to update.
GainAutoAdjustDelay
–
Currently unimplemented.
GainAutoAdjustTol
- In percent. A threshold. Sets a range in variation from GainAutoTarget in which the auto gain algorithm
will not respond. Can be used to limit gain setting changes to only larger variations in scene lighting.
GainAutoMax
–
In dB. Sets the upper bound to the gain setting in Auto gain mode.
GainAutoMin
–
In dB. Sets the lower bound to the gain setting in Auto gain mode. Normally this number would be set to
zero.
GainAutoOutliers
- In percent. The percentage of image pixels that do not have to fit into the auto gain range
GainAutoRate
- In percent. Determines the rate at which the auto gain function changes the gain setting.
GainAutoTarget
- In percent. Controls the general lightness or darkness of the Auto gain feature. A percentage of the
maximum GainValue.
GainMode
Manual - The camera gain is fixed by GainValue parameter.
Auto - The gain will vary continuously according to the scene illumination. The Auto gain function operates according to the
Auto and DSP controls. Available on cameras with version 1.36 firmware and above.
AutoOnce - The gain will be set once according to the scene illumination and then remain at that setting even when the scene
illumination changes. The AutoOnce gain function operates according to the Auto and DSP controls
GainValue
–
In dB. G
dB
= 20 log
10
(V
in
/V
out
). The gain setting applied to the sensor. Default gain is zero, and gives the best image
quality. However, in low light situations, it may be necessary to increase the gain setting.
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.
