ICogAcqLookupTable.SetLookupTable Method

ICogAcqLookupTable SetLookupTable Method

Cognex VisionPro 9.20

Access the specified lookup table values as an array.

Namespace: Cognex.VisionPro
Assembly: Cognex.VisionPro.Core (in Cognex.VisionPro.Core.dll) Version: 80.0.0.0

Syntax

void SetLookupTable(
	int index,
	byte[] value
)

void SetLookupTable(
	int index,
	byte[] value
)

Sub SetLookupTable ( 
	index As Integer,
	value As Byte()
)

Sub SetLookupTable ( 
	index As Integer,
	value As Byte()
)

void SetLookupTable(
	int index, 
	array<unsigned char>^ value
)

void SetLookupTable(
	int index, 
	array<unsigned char>^ value
)

Parameters

index: Type: System Int32
The index of the lookup table. For cameras that support only one lookup table, this value should always be zero. For dual tap cameras, the index of the even field is zero, and the index of the odd field is 1.

value: Type: System Byte

Events

Event Type	Reason
ICogChangedEvent Changed	Fires when the lookup table is changed. The following state flag may be affected: SfGetLookupTable

Event Type

Reason

ICogChangedEvent Changed

Fires when the lookup table is changed.

The following state flag may be affected:

SfGetLookupTable

Exceptions

Exception	Condition
ArgumentException	value is not of the proper size for the pixel depth of this FIFO.
ArgumentException	index is < zero or > NumLookupTables − 1.

Remarks

Sets or gets lookup table values as an array.

NumLookupTables determines how many lookup tables a camera supports. Lookup table numbering starts at zero. The index for a camera that supports only one lookup table, then, would be 0.

For dual tap cameras that provide even- and odd-field lookup tables, lookup table 0 is the even field and lookup table 1 is the odd field.

Default Value: An identity table.

Examples

C++

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using Cognex.VisionPro;

private CogFrameGrabbers myFrameGrabbers;
private ICogFrameGrabber myFrameGrabber;
private ICogAcqFifo myAcqFifo;

private void InitializeFifo()
{
    const string VIDEO_FORMAT = "Sony XC75 640x480";
    ICogAcqLookupTable LUTParams;

    myFrameGrabbers = new CogFrameGrabbers();
    myFrameGrabber = myFrameGrabbers[0];
    myAcqFifo = myFrameGrabber.CreateAcqFifo(VIDEO_FORMAT, 
        Cognex.VisionPro.CogAcqFifoPixelFormatConstants.Format8Grey, 0, false);

    LUTParams = myAcqFifo.OwnedLookupTableParams;

    if (LUTParams  != null) {
        byte[] inverseLut = LUTParams.GetLookupTable(0);

        for (int i = 0; i <= 255; i++)
            inverseLut[i] = (byte) (255 - i);
            LUTParams.SetLookupTable(0, inverseLut);
      }
}

using Cognex.VisionPro;

private CogFrameGrabbers myFrameGrabbers;
private ICogFrameGrabber myFrameGrabber;
private ICogAcqFifo myAcqFifo;

private void InitializeFifo()
{
    const string VIDEO_FORMAT = "Sony XC75 640x480";
    ICogAcqLookupTable LUTParams;

    myFrameGrabbers = new CogFrameGrabbers();
    myFrameGrabber = myFrameGrabbers[0];
    myAcqFifo = myFrameGrabber.CreateAcqFifo(VIDEO_FORMAT, 
        Cognex.VisionPro.CogAcqFifoPixelFormatConstants.Format8Grey, 0, false);

    LUTParams = myAcqFifo.OwnedLookupTableParams;

    if (LUTParams  != null) {
        byte[] inverseLut = LUTParams.GetLookupTable(0);

        for (int i = 0; i <= 255; i++)
            inverseLut[i] = (byte) (255 - i);
            LUTParams.SetLookupTable(0, inverseLut);
      }
}

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Imports Cognex.VisionPro

Private myFrameGrabbers As CogFrameGrabbers
Private myFrameGrabber As Cognex.VisionPro.ICogFrameGrabber
Private myAcqFifo As Cognex.VisionPro.ICogAcqFifo

Private Sub InitializeFifo()
        Const VIDEO_FORMAT = "Sony XC75 640x480"
        Dim LUTParams As Cognex.VisionPro.ICogAcqLookupTable

        myFrameGrabbers = New CogFrameGrabbers
        myFrameGrabber = myFrameGrabbers.Item(0)
        myAcqFifo = myFrameGrabber.CreateAcqFifo(VIDEO_FORMAT, CogAcqFifoPixelFormatConstants.Format8Grey, 0, False)

        LUTParams = myAcqFifo.OwnedLookupTableParams

        If Not LUTParams Is Nothing Then
            Dim i As Integer
            Dim inverseLut As Byte()
            inverseLut = LUTParams.GetLookupTable(0)
            For i = 0 To 255
                inverseLut(i) = 255 - i
            Next
            LUTParams.SetLookupTable(0, inverseLut)
        End If
End Sub

Imports Cognex.VisionPro

Private myFrameGrabbers As CogFrameGrabbers
Private myFrameGrabber As Cognex.VisionPro.ICogFrameGrabber
Private myAcqFifo As Cognex.VisionPro.ICogAcqFifo

Private Sub InitializeFifo()
        Const VIDEO_FORMAT = "Sony XC75 640x480"
        Dim LUTParams As Cognex.VisionPro.ICogAcqLookupTable

        myFrameGrabbers = New CogFrameGrabbers
        myFrameGrabber = myFrameGrabbers.Item(0)
        myAcqFifo = myFrameGrabber.CreateAcqFifo(VIDEO_FORMAT, CogAcqFifoPixelFormatConstants.Format8Grey, 0, False)

        LUTParams = myAcqFifo.OwnedLookupTableParams

        If Not LUTParams Is Nothing Then
            Dim i As Integer
            Dim inverseLut As Byte()
            inverseLut = LUTParams.GetLookupTable(0)
            For i = 0 To 255
                inverseLut(i) = 255 - i
            Next
            LUTParams.SetLookupTable(0, inverseLut)
        End If
End Sub