RecognitionAlternate.Confidence Property
Gets the level of confidence that a recognizer has in the recognition of a RecognitionAlternate object.
Namespace: Microsoft.Ink
Assembly: Microsoft.Ink (in Microsoft.Ink.dll)
Syntax
'Declaration
Public ReadOnly Property Confidence As RecognitionConfidence
'Usage
Dim instance As RecognitionAlternate
Dim value As RecognitionConfidence
value = instance.Confidence
public RecognitionConfidence Confidence { get; }
public:
property RecognitionConfidence Confidence {
RecognitionConfidence get ();
}
public function get Confidence () : RecognitionConfidence
Property Value
Type: Microsoft.Ink.RecognitionConfidence
The level of confidence that a recognizer has in the recognition of a RecognitionAlternate object or of a gesture.
Remarks
If the alternate represents a phrase or sentence, the value represents the lowest confidence level of a recognition segment found in the phrase or sentence. However, if the alternate represents a word, the value represents the confidence level of the word.
Note
This property throws an exception if the Recognizer that generates the RecognitionAlternate does not support confidence levels.
Of the Microsoft® recognizer, only the Microsoft English (US) Handwriting Recognizer and the Microsoft Gesture Recognizer support confidence levels. Third party recognizers may or may not support confidence levels.
Examples
This C# example defines event handlers for a form, ConfidenceAlternatesForm, to which a Button control, theButton, has been added. The sample also defines an InkCollector, theInkCollector, a RecognizerContext, theRecognizerContext, and a RecognitionResult, theRecognitionResult, which are used to collect ink and to perform recognition.
The event handler for the form's load event creates an ink collector and gets a recognizer context for the English (US) language.
The event handler for the button's click event performs recognition on the strokes in the ink collector, divides the strokes along confidence boundaries, and colors the strokes according to their confidence level.
[C#]
// Declare ink elements and create drawing attributes.
Microsoft.Ink.InkCollector theInkCollector = null;
Microsoft.Ink.RecognizerContext theRecognizerContext = null;
Microsoft.Ink.RecognitionResult theRecognitionResult = null;
Microsoft.Ink.DrawingAttributes theStrongDA =
new DrawingAttributes(Color.Green);
Microsoft.Ink.DrawingAttributes theIntermediateDA =
new DrawingAttributes(Color.Goldenrod);
Microsoft.Ink.DrawingAttributes thePoorDA =
new DrawingAttributes(Color.Red);
// Event handler for the form's Load event.
private void ConfidenceAlternatesForm_Load(object sender, System.EventArgs e)
{
// Create the ink collector.
this.theInkCollector = new Microsoft.Ink.InkCollector(this.Handle);
this.theInkCollector.Enabled = true;
// Get a recognizer context for the English (US) recognizer.
foreach (Recognizer theRecognizer in new Recognizers())
{
foreach (short lcid in theRecognizer.Languages)
{
// 0409 is the LCID for the en-us language.
if (0x0409 == lcid)
{
this.theRecognizerContext = theRecognizer.CreateRecognizerContext();
break;
}
}
if (null != theRecognizerContext)
{
break;
}
}
// Throw an exception if the recognizer is not found.
if (null == theRecognizerContext)
{
throw new ApplicationException("No recognizer found");
}
}
// Event handler for the button's Click event.
private void theButton_Click(object sender, System.EventArgs e)
{
// Check for ink before performing recognition.
if (0 == this.theInkCollector.Ink.Strokes.Count)
{
System.Windows.Forms.MessageBox.Show("No ink to recognize.");
return;
}
// Perform recognition on the strokes currently in the ink collector.
Microsoft.Ink.RecognitionStatus theRecognitionStatus;
this.theRecognizerContext.Strokes = this.theInkCollector.Ink.Strokes;
this.theRecognitionResult =
this.theRecognizerContext.Recognize(out theRecognitionStatus);
// Check the recognition status.
if (Microsoft.Ink.RecognitionStatus.NoError != theRecognitionStatus)
{
System.Windows.Forms.MessageBox.Show(
"There was an error recognizing the ink.");
return;
}
// Check for a recognition result.
if (null == this.theRecognitionResult)
{
System.Windows.Forms.MessageBox.Show(
"No recognition result available.");
return;
}
// Get the confidence alternates collection for the top alternate.
Microsoft.Ink.RecognitionAlternates theConfidenceAlternates =
this.theRecognitionResult.TopAlternate.ConfidenceAlternates;
using (System.Drawing.Graphics g = this.CreateGraphics())
{
// Clear the drawing surface
g.Clear(this.BackColor);
// For each confidence alternate in the collection:
foreach(Microsoft.Ink.RecognitionAlternate theAlternate
in theConfidenceAlternates)
{
// Update the drawing attributes.
switch (theAlternate.Confidence)
{
case Microsoft.Ink.RecognitionConfidence.Strong:
theAlternate.Strokes.ModifyDrawingAttributes(
theStrongDA);
break;
case Microsoft.Ink.RecognitionConfidence.Intermediate:
theAlternate.Strokes.ModifyDrawingAttributes(
theIntermediateDA);
break;
case Microsoft.Ink.RecognitionConfidence.Poor:
theAlternate.Strokes.ModifyDrawingAttributes(
thePoorDA);
break;
}
}
// Redraw the ink.
this.theInkCollector.Renderer.Draw(g, this.theRecognitionResult.Strokes);
}
}
// Event handler for the form's Closed event.
private void ConfidenceAlternatesForm_Closed(object sender, System.EventArgs e)
{
// Free the resources for the ink collector, recognizer context, and pens.
this.theInkCollector.Dispose();
this.theInkCollector = null;
this.theRecognizerContext.Dispose();
this.theRecognizerContext = null;
}
This Microsoft Visual Basic® .NET example defines event handlers for a form, ConfidenceAlternatesForm, to which a Button control, theButton, has been added. The sample also defines an InkCollector, theInkCollector, a RecognizerContext, theRecognizerContext, and a RecognitionResult, theRecognitionResult, which are used to collect ink and to perform recognition.
The event handler for the form's load event creates an ink collector and gets a recognizer context for the English (US) language.
The event handler for the button's click event performs recognition on the strokes in the ink collector, divides the strokes along confidence boundaries, and colors the strokes according to their confidence level.
[Visual Basic]
' Declare ink elements and create drawing attributes.
Dim theInkCollector As Microsoft.Ink.InkCollector
Dim theRecognizerContext As Microsoft.Ink.RecognizerContext
Dim theRecognitionResult As Microsoft.Ink.RecognitionResult
Dim theStrongDA As Microsoft.Ink.DrawingAttributes = New DrawingAttributes(Color.Green)
Dim theIntermediateDA As Microsoft.Ink.DrawingAttributes = New DrawingAttributes(Color.Goldenrod)
Dim thePoorDA As Microsoft.Ink.DrawingAttributes = New DrawingAttributes(Color.Red)
' Event handler for the form's Load event.
Private Sub ConfidenceAlternatesForm_Load(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles MyBase.Load
' Create the ink collector.
Me.theInkCollector = New Microsoft.Ink.InkCollector(Me.Handle)
Me.theInkCollector.Enabled = True
' Get a recognizer context for the English (US) recognizer.
For Each theRecognizer As Recognizer In New Recognizers
For Each lcid As Short In theRecognizer.Languages
' 0409 is the LCID for the en-us language.
If &H409 = lcid Then
Me.theRecognizerContext = theRecognizer.CreateRecognizerContext()
Exit For
End If
Next
If Not (theRecognizerContext Is Nothing) Then
Exit For
End If
Next
' Throw an exception if the recognizer is not found.
If theRecognizerContext Is Nothing Then
Throw New ApplicationException("No recognizer found")
End If
End Sub
' Event handler for the "Recognize" button's Click event.
Private Sub theButton_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles theButton.Click
' Check for ink before performing recognition.
If Me.theInkCollector.Ink.Strokes.Count = 0 Then
System.Windows.Forms.MessageBox.Show("No ink to recognize.")
Return
End If
' Perform recognition on the strokes currently in the ink collector.
Dim theRecognitionStatus As Microsoft.Ink.RecognitionStatus
Me.theRecognizerContext.Strokes = Me.theInkCollector.Ink.Strokes
Me.theRecognitionResult = _
Me.theRecognizerContext.Recognize(theRecognitionStatus)
' Check for a recognition result.
If (Me.theRecognitionResult Is Nothing) Then
System.Windows.Forms.MessageBox.Show("No recognition result available.")
Return
End If
' Get the confidence alternates collection for the top alternate.
Dim theConfidenceAlternates As Microsoft.Ink.RecognitionAlternates = _
Me.theRecognitionResult.TopAlternate.ConfidenceAlternates
' Create a temporary graphics object.
Dim g As System.Drawing.Graphics = Me.CreateGraphics()
' Clear the drawing surface
g.Clear(Me.BackColor)
' For each confidence alternate in the collection:
For Each theAlternate As Microsoft.Ink.RecognitionAlternate _
In theConfidenceAlternates
' Update the drawing attributes.
Select Case theAlternate.Confidence
Case RecognitionConfidence.Strong
theAlternate.Strokes.ModifyDrawingAttributes(theStrongDA)
Case RecognitionConfidence.Intermediate
theAlternate.Strokes.ModifyDrawingAttributes(theIntermediateDA)
Case RecognitionConfidence.Poor
theAlternate.Strokes.ModifyDrawingAttributes(thePoorDA)
End Select
Next
' Redraw the ink.
Me.theInkCollector.Renderer.Draw(g, Me.theRecognitionResult.Strokes)
' Dispose of the graphics object.
g.Dispose()
End Sub
' Event handler for the form's Closed event.
Private Sub ConfidenceAlternatesForm_Closed(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles MyBase.Closed
' Free the resources for the ink collector and recognizer context.
Me.theInkCollector.Dispose()
Me.theInkCollector = Nothing
Me.theRecognizerContext.Dispose()
Me.theRecognizerContext = Nothing
End Sub
Platforms
Windows 7, Windows Vista, Windows Server 2008 R2, Windows Server 2008
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
Version Information
.NET Framework
Supported in: 3.0