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GX1660 User Manual
70-0057A-A
Allied Vision Technologies (Canada) Inc.
32
DSPSubregionLeft - defines the position of left edge of the DSP subregion. Measured in pixels from the left
edge. Defaults to zero.
DSPSubregionRight - defines the position of the right edge of the DSP subregion as measured from the left
side of the image. Defaults to a huge number much larger than the maximum number of sensor columns.
DSPSubregionTop - Defines the top edge of the DSP subregion defined as the number of pixels from the
top edge of the full image. Defaults to zero.
DefectMask
This feature is only available on the GE4000 and GE4900 cameras. The standard model of these cameras use
Class 2 sensors which can have column defects. The DefectMask replaces defective columns with interpolated
values based on neighboring columns. Class 1 and Class 0 sensors are available for these cameras which do
not require any column masking.
DefectMaskColumnEnable - The defect mask can be set to On or Off.
Exposure
Auto
This group of controls relates to the camera auto-exposure function.
NOTE: The camera must be acquiring images in order for the auto exposure algorithm to update.
ExposureAutoAdjustDelay – Currently unimplemented.
ExposureAutoAdjustTol – In percent. A threshold. Sets a range in variation from
ExposureAutoTarget in which the autoexposure algorithm will not respond. Can be used to limit
exposure setting changes to only larger variations in scene lighting.
ExposureAutoAlg – The following algorithms can be used to calculate auto-exposure:
Mean – The arithmetic mean of the histogram of the current image is compared to
ExposureAutoTarget, and the next image adjusted in exposure time to meet this target. Bright
areas are allowed to saturate.
FitRange – The histogram of the current image is measured, and the exposure time of the next
image is adjusted so bright areas are not saturated. Generally, the Mean setting is preferred.
ExposureAutoMax – In microseconds. This sets the upper bound to the exposure setting in
autoexposure mode. This is useful in situations where frame rate is important. This value would
normally be set to something less than 1x10^6/(desired frame rate).
ExposureAutoMin - In microseconds. This sets the lower bound to the exposure setting in
autoexposure mode.
ExposureAutoOutliers – In percent. The percentage of image pixels that do not have to fit into the
proper exposure range.
ExposureAutoRate – In percent. Determines the rate at which the autoexposure function changes
the exposure setting.
ExposureAutoTarget – In percent. Controls the general lightness or darkness of the auto exposure
feature; specifically the target mean histogram level of the image, 0 being black, 100 being white.
ExposureMode
Manual - The camera exposure time is fixed by ExposureValue parameter.