LightMeterPoint Method
Syntax
CWMachineVision.LightMeterPoint SourceImage, Point, GrayLevelIntensity [, ShowSearchArea = True] [, CoordinateTransformation]
Return Type
On success, this method returns 0. On failure, this function returns a negative number.
Purpose
Measures the pixel intensities in a 3 x 3 pixel neighborhood centered on a point of an image.
Remarks
Use this method with U8, I16, and SGL images.
Parameters
SourceImage As CWIMAQImage
The input image.
Point As CWIMAQPoint
The point around which to measure the intensities.
GrayLevelIntensity As Single
On return, the intensity in the 3 x 3 pixel neighborhood centered on the point.
ShowSearchArea As Variant
[Optional] If True, the search area is overlaid on the image.
This parameter has a default value of True.
CoordinateTransformation As Variant
[Optional] A CWMVCoordinateTransformation object. If supplied, the input search area is transformed using this parameter.
Example
Private Sub Run_Click()
'Inputs to LightMeterPoint
Dim SearchArea As New CWIMAQPoint
Dim Transformation As New CWMVCoordinateTransformation
'Outputs of LightMeterPoint
Dim MeasuredIntensity As Single
'Get the search area from the viewer
CWMachineVision1.GetSelectedPointFromViewer CWIMAQViewer1, SearchArea
'Measure the intensity inside the search region
CWMachineVision1.LightMeterPoint CWIMAQViewer1.Image, SearchArea, MeasuredIntensity, , _
Transformation
'Display the mean intensity in a text box
Text1.Text = MeasuredIntensity
End Sub