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Exposure Property
See Also 
Leadtools.Multimedia Namespace > CameraControl Class : Exposure Property



Gets or sets the camera's exposure setting.

Syntax

Visual Basic (Declaration) 
Public Property Exposure As Integer
Visual Basic (Usage)Copy Code
Dim instance As CameraControl
Dim value As Integer
 
instance.Exposure = value
 
value = instance.Exposure
C# 
public int Exposure {get; set;}
C++/CLI 
public:
property int Exposure {
   int get();
   void set (    int value);
}

Property Value

The property value.

Example

Visual BasicCopy Code
Public _result As Boolean = False
Public _form As CaptureCtrlForm = New CaptureCtrlForm()
Public Sub CameraControlExample()
  ' reference the capture control
  Dim capturectrl As CaptureCtrl = _form.CaptureCtrl

  Try
     ' try to find a USB video device, use your device name here
     If capturectrl.VideoDevices("USB") Is Nothing Then
       Throw New Exception("No USB video device available")
     End If

     capturectrl.VideoDevices("USB").Selected = True

     ' reference the camera control
     Dim camera As CameraControl = capturectrl.CameraControl

     If Not camera Is Nothing Then
       ' try to set some camera auto properties
       camera.AutoExposure = True
       camera.AutoFocus = True
       camera.AutoIris = True
       camera.AutoPan = False
       camera.AutoRoll = False
       camera.AutoTilt = False
       camera.AutoZoom = True

       ' now try to set some camera manual properties
       camera.Exposure = camera.ExposureInfo.Min
       camera.Focus = camera.FocusInfo.Max
       camera.Iris = camera.IrisInfo.Default
       camera.Pan = camera.PanInfo.Min
       camera.Roll = camera.RollInfo.Min
       camera.Tilt = camera.TiltInfo.Min
       camera.Zoom = camera.ZoomInfo.Min

       ' now increment a property by the stepping delta
       camera.Exposure += camera.ExposureInfo.StepDelta

       ' set the result to what we expect
       _result = (camera.Exposure = camera.ExposureInfo.Min + camera.ExposureInfo.StepDelta)

       ' now check a property to see if it is supported and has a manual setting
       ' if so, set it to auto
       If camera.ExposureInfo.Flags <> CameraControlFlags.Unsupported AndAlso camera.ExposureInfo.Flags = CameraControlFlags.Manual Then
         camera.AutoExposure = True
       End If

       ' set the result to what we expect
       _result = _result And (camera.ExposureInfo.Flags = CameraControlFlags.Auto)
     End If

     ' continue setting capture settings
     ' and possibly start a capture process
     ' ...
  Catch e1 As Exception
     _result = False
  End Try
End Sub
C#Copy Code
public bool _result = false;
public CaptureCtrlForm _form = new CaptureCtrlForm();
public void CameraControlExample()
{
   // reference the capture control
   CaptureCtrl capturectrl = _form.CaptureCtrl;

   try
   {
      // try to find a USB video device, use your device name here
      if (capturectrl.VideoDevices["USB"] == null)
         throw new Exception("No USB video device available");

      capturectrl.VideoDevices["USB"].Selected = true;

      // reference the camera control
      CameraControl camera = capturectrl.CameraControl;

      if (camera != null)
      {
         // try to set some camera auto properties
         camera.AutoExposure = true;
         camera.AutoFocus = true;
         camera.AutoIris = true;
         camera.AutoPan = false;
         camera.AutoRoll = false;
         camera.AutoTilt = false;
         camera.AutoZoom = true;

         // now try to set some camera manual properties
         camera.Exposure = camera.ExposureInfo.Min;
         camera.Focus = camera.FocusInfo.Max;
         camera.Iris = camera.IrisInfo.Default;
         camera.Pan = camera.PanInfo.Min;
         camera.Roll = camera.RollInfo.Min;
         camera.Tilt = camera.TiltInfo.Min;
         camera.Zoom = camera.ZoomInfo.Min;

         // now increment a property by the stepping delta
         camera.Exposure += camera.ExposureInfo.StepDelta;

         // set the result to what we expect
         _result = (camera.Exposure == camera.ExposureInfo.Min + camera.ExposureInfo.StepDelta);

         // now check a property to see if it is supported and has a manual setting
         // if so, set it to auto
         if (camera.ExposureInfo.Flags != CameraControlFlags.Unsupported
            && camera.ExposureInfo.Flags == CameraControlFlags.Manual)
            camera.AutoExposure = true;

         // set the result to what we expect
         _result &= (camera.ExposureInfo.Flags == CameraControlFlags.Auto);
      }

      // continue setting capture settings
      // and possibly start a capture process
      // ...
   }
   catch (Exception)
   {
      _result = false;
   }
}

Remarks

Gets and sets the manual setting for the CameraControlProperty.Exposure property. To get the range and default value of this camera property, use the CameraControl.ExposureInfo property. For more information, refer to the Microsoft documentation for the IAMCameraControl.Get and IAMCameraControl.Set and methods.

Assigning a value to this property can raise an error exception.

For more information, refer to the Error Codes.

Requirements

Target Platforms: Microsoft .NET Framework 2.0, Windows 2000, Windows XP, Windows Server 2003 family, Windows Server 2008 family, Windows Vista, Windows 7

See Also