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Dahua_StartAcquisition

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Module: ThirdParty

Initializes and starts image acquisition in a camera.

Name Type Range Description
Input value
 inDeviceID String* Device identifying number
Input value
 inInputQueueSize Integer 1 - 200 Capacity of output frames queue
Input value
 inFrameRate Real* Requested camera frame rate in frames per second
Input value
 inExposureTime Real* Camera frame exposition time
Input value
 inGain Real* Analog gain of source image in device raw unit
Input value
 inBlackLevel Integer* Black level of source image
Input value
 inTriggerEnabled Bool* Configure trigger enable
Input value
 inTriggerSource DahuaTriggerSource* Source of acquisition trigger
Input value
 inTriggerActivation DahuaTriggerActivation* Circumstances defining when the trigger is activated

Remarks

This filter is intended for establishing connection with a Dahua camera device using MVViewer interface, to initialize image streaming. It is only needed when explicit image acquisition start is required in the initial phase of a program. For example, it can be used to prepare a camera, running in triggered mode, to be able to capture trigger signals before the first invoke of Dahua_GrabImage or to start multiple cameras in sync before the acquisition phase.

The use of this filter is not obligatory. Dahua_GrabImage or Dahua_GrabImage_WithTimeout] filters will initialize and start image acquisition upon their first invoke.

This filter has no effect when invoked for the second time and when invoked after image grabbing filters.

Camera driver software

This filter is intended to cooperate with a camera using its vendor SDK. To be able to connect to a camera, it is required to install MVViewer software with camera dedicated drivers.

MVViewer can be downloaded from the following website: https://www.dahuasecurity.com/ (registration may be required).

Add DLL path to system environment variable may be required.

Recommended MVViewer version for Aurora Vision Studio usage is 2.1.6.

Camera identification

When there is only one camera connected to a computer, field inDeviceID can be set to Auto. In this case, first available camera will be found and connected.

inDeviceID field can be used to pick one of multiple cameras connected to computer. DeviceID can be set to:

  • Serial number - should be specified on device casing in format "vendor:serial number".
Camera parameters

Setting inInputQueueSize parameter to 'Auto' will select four value as input queue size.

All the other parameters exposed by camera filters are optional, setting them to 'Auto' leaves related parameter unchanged in camera (device default or user set configuration).

To change other, more advanced camera parameters, use specific filters.

Parallel execution

This filter cannot be placed in multiple Workers.

Complexity Level

This filter is available on Advanced Complexity Level.

See Also