Allied Vision Technologies GX1660C Spécifications télécharger pdf (Page 36)

GX1660 Technical Manual Page 36

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.

Auto - The exposure time will vary continuously according to the scene illumination. The Auto exposure function operates

according to the Auto and DSP controls

AutoOnce - The exposure will be set once according to the scene illumination and then remain at that setting even when the

scene illumination changes. The AutoOnce exposure function operates according to the Auto and DSP controls

External - When ExposureMode is set to External the exposure time will be controlled by an external signal appearing on

SyncIn1 or SyncIn2. In order for this feature to work, the parameter FrameStartTriggerMode must be set to SyncIn1 or

SyncIn2. This feature is supported in version 1.36 firmware and above. It is not available on any of the CMOS-based cameras.

ExposureValue – In microseconds. The sensor integration time. 15000 corresponds to 15 ms integration time, 1000 corresponds to

1ms, etc.

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Allied Vision Technologies GX1660C Spécifications Page 36