將 Windows Ink 筆劃辨識為文字和圖案 \(部分機器翻譯\)

發行項
04/25/2024

使用 Windows Ink 內建的辨識功能，將筆跡筆劃轉換成文字和圖形。

Important APIs：InkCanvas、Windows.UI.Input.Inking

使用筆跡分析進行自由格式辨識

在此處，我們將示範如何使用 Windows Ink 分析引擎 (Windows.UI.Input.Inking.Analysis) 將 InkCanvas 上的一組自由格式筆劃分類、分析和辨識為文字或圖形。 (除了文字和圖形辨識之外，筆跡分析還可以用來辨識文件結構、項目符號清單和一般繪圖。)

注意

對於基本、單行、純文字案例 (例如表單輸入)，請參閱本主題後面的受限手寫辨識。

在此範例中，當使用者按一下按鈕以指出完成繪圖時，就會起始辨識。

從筆跡分析範例下載此範例 (基本)

首先，我們設定 UI (MainPage.xaml)。

UI 包含 [辨識] 按鈕、InkCanvas 和標準 Canvas。按下 [辨識] 按鈕時，會分析筆跡畫布上的所有筆跡筆劃，並在標準畫布上繪製對應的圖形和文字。。然後，原始筆跡筆劃會從筆跡畫布中刪除。

<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
     <Grid.RowDefinitions>
         <RowDefinition Height="Auto"/>
         <RowDefinition Height="*"/>
     </Grid.RowDefinitions>
     <StackPanel x:Name="HeaderPanel" 
                 Orientation="Horizontal" 
                 Grid.Row="0">
         <TextBlock x:Name="Header" 
                     Text="Basic ink analysis sample" 
                     Style="{ThemeResource HeaderTextBlockStyle}" 
                     Margin="10,0,0,0" />
         <Button x:Name="recognize" 
                 Content="Recognize" 
                 Margin="50,0,10,0"/>
     </StackPanel>
     <Grid x:Name="drawingCanvas" Grid.Row="1">

         <!-- The canvas where we render the replacement text and shapes. -->
         <Canvas x:Name="recognitionCanvas" />
         <!-- The canvas for ink input. -->
         <InkCanvas x:Name="inkCanvas" />

     </Grid>
</Grid>

在 UI 程式碼後置檔案 (MainPage.xaml.cs)，新增筆跡和筆跡分析功能所需的命名空間類型參考：

然後，我們會指定全域變數：

 InkAnalyzer inkAnalyzer = new InkAnalyzer();
 IReadOnlyList<InkStroke> inkStrokes = null;
 InkAnalysisResult inkAnalysisResults = null;

接下來，我們會設定一些基本的筆跡輸入行為：

InkPresenter 設定為將來自筆、滑鼠和觸控的輸入資料解釋為筆跡筆劃 (InputDeviceTypes)。
筆跡筆劃會使用指定的 InkDrawingAttributes 在 InkCanvas 上轉譯。
也會宣告「辨識」按鈕上 Click 事件的接聽程式。

/// <summary>
/// Initialize the UI page.
/// </summary>
public MainPage()
{
    this.InitializeComponent();

    // Set supported inking device types.
    inkCanvas.InkPresenter.InputDeviceTypes =
        Windows.UI.Core.CoreInputDeviceTypes.Mouse |
        Windows.UI.Core.CoreInputDeviceTypes.Pen | 
        Windows.UI.Core.CoreInputDeviceTypes.Touch;

    // Set initial ink stroke attributes.
    InkDrawingAttributes drawingAttributes = new InkDrawingAttributes();
    drawingAttributes.Color = Windows.UI.Colors.Black;
    drawingAttributes.IgnorePressure = false;
    drawingAttributes.FitToCurve = true;
    inkCanvas.InkPresenter.UpdateDefaultDrawingAttributes(drawingAttributes);

    // Listen for button click to initiate recognition.
    recognize.Click += RecognizeStrokes_Click;
}

在此範例中，我們會在 [辨識] 按鈕的 Click 事件處理常式中執行筆跡分析。

首先，在 InkCanvas.InkPresenter 的 StrokeContainer 上呼叫 GetStrokes，以取得所有目前筆跡筆劃的集合。
如果筆跡筆劃存在，請在 InkAnalyzer 的 AddDataForStrokes 呼叫中傳遞筆劃。
我們嘗試同時辨識繪圖和文字，但您可以使用 SetStrokeDataKind 方法來指定您只對文字感興趣 (包括文件結構和項目符號清單) 或只在繪圖中 (包括圖形辨識)。
呼叫 AnalyzeAsync 以起始筆跡分析並取得 InkAnalysisResult。
如果 Status 傳回 Updated 的狀態，請針對 InkAnalysisNodeKind.InkWord 和 InkAnalysisNodeKind.InkDrawing 呼叫 FindNodes。
逐一查看這兩組節點類型，並在辨識畫布上繪製個別的文字或圖形 (在筆跡畫布下方)。
最後，從 InkAnalyzer 刪除已辨識的節點，並從筆跡畫布中刪除對應的筆跡筆劃。

/// <summary>
/// The "Analyze" button click handler.
/// Ink recognition is performed here.
/// </summary>
/// <param name="sender">Source of the click event</param>
/// <param name="e">Event args for the button click routed event</param>
private async void RecognizeStrokes_Click(object sender, RoutedEventArgs e)
{
    inkStrokes = inkCanvas.InkPresenter.StrokeContainer.GetStrokes();
    // Ensure an ink stroke is present.
    if (inkStrokes.Count > 0)
    {
        inkAnalyzer.AddDataForStrokes(inkStrokes);

        // In this example, we try to recognizing both 
        // writing and drawing, so the platform default 
        // of "InkAnalysisStrokeKind.Auto" is used.
        // If you're only interested in a specific type of recognition,
        // such as writing or drawing, you can constrain recognition 
        // using the SetStrokDataKind method as follows:
        // foreach (var stroke in strokesText)
        // {
        //     analyzerText.SetStrokeDataKind(
        //      stroke.Id, InkAnalysisStrokeKind.Writing);
        // }
        // This can improve both efficiency and recognition results.
        inkAnalysisResults = await inkAnalyzer.AnalyzeAsync();

        // Have ink strokes on the canvas changed?
        if (inkAnalysisResults.Status == InkAnalysisStatus.Updated)
        {
            // Find all strokes that are recognized as handwriting and 
            // create a corresponding ink analysis InkWord node.
            var inkwordNodes = 
                inkAnalyzer.AnalysisRoot.FindNodes(
                    InkAnalysisNodeKind.InkWord);

            // Iterate through each InkWord node.
            // Draw primary recognized text on recognitionCanvas 
            // (for this example, we ignore alternatives), and delete 
            // ink analysis data and recognized strokes.
            foreach (InkAnalysisInkWord node in inkwordNodes)
            {
                // Draw a TextBlock object on the recognitionCanvas.
                DrawText(node.RecognizedText, node.BoundingRect);

                foreach (var strokeId in node.GetStrokeIds())
                {
                    var stroke = 
                        inkCanvas.InkPresenter.StrokeContainer.GetStrokeById(strokeId);
                    stroke.Selected = true;
                }
                inkAnalyzer.RemoveDataForStrokes(node.GetStrokeIds());
            }
            inkCanvas.InkPresenter.StrokeContainer.DeleteSelected();

            // Find all strokes that are recognized as a drawing and 
            // create a corresponding ink analysis InkDrawing node.
            var inkdrawingNodes =
                inkAnalyzer.AnalysisRoot.FindNodes(
                    InkAnalysisNodeKind.InkDrawing);
            // Iterate through each InkDrawing node.
            // Draw recognized shapes on recognitionCanvas and
            // delete ink analysis data and recognized strokes.
            foreach (InkAnalysisInkDrawing node in inkdrawingNodes)
            {
                if (node.DrawingKind == InkAnalysisDrawingKind.Drawing)
                {
                    // Catch and process unsupported shapes (lines and so on) here.
                }
                // Process generalized shapes here (ellipses and polygons).
                else
                {
                    // Draw an Ellipse object on the recognitionCanvas (circle is a specialized ellipse).
                    if (node.DrawingKind == InkAnalysisDrawingKind.Circle || node.DrawingKind == InkAnalysisDrawingKind.Ellipse)
                    {
                        DrawEllipse(node);
                    }
                    // Draw a Polygon object on the recognitionCanvas.
                    else
                    {
                        DrawPolygon(node);
                    }
                    foreach (var strokeId in node.GetStrokeIds())
                    {
                        var stroke = inkCanvas.InkPresenter.StrokeContainer.GetStrokeById(strokeId);
                        stroke.Selected = true;
                    }
                }
                inkAnalyzer.RemoveDataForStrokes(node.GetStrokeIds());
            }
            inkCanvas.InkPresenter.StrokeContainer.DeleteSelected();
        }
    }
}

以下是在辨識畫布上繪製 TextBlock 的函式。我們會使用筆跡畫布上相關聯筆墨筆劃的週框，來設定 TextBlock 的位置和字型大小。

 /// <summary>
 /// Draw ink recognition text string on the recognitionCanvas.
 /// </summary>
 /// <param name="recognizedText">The string returned by text recognition.</param>
 /// <param name="boundingRect">The bounding rect of the original ink writing.</param>
 private void DrawText(string recognizedText, Rect boundingRect)
 {
     TextBlock text = new TextBlock();
     Canvas.SetTop(text, boundingRect.Top);
     Canvas.SetLeft(text, boundingRect.Left);

     text.Text = recognizedText;
     text.FontSize = boundingRect.Height;

     recognitionCanvas.Children.Add(text);
 }

以下是在辨識畫布上繪製省略號和多邊形的函式。我們會使用筆跡畫布上相關聯筆墨筆劃的週框，來設定形狀的位置和字型大小。

 // Draw an ellipse on the recognitionCanvas.
 private void DrawEllipse(InkAnalysisInkDrawing shape)
 {
     var points = shape.Points;
     Ellipse ellipse = new Ellipse();

     ellipse.Width = shape.BoundingRect.Width;
     ellipse.Height = shape.BoundingRect.Height;

     Canvas.SetTop(ellipse, shape.BoundingRect.Top);
     Canvas.SetLeft(ellipse, shape.BoundingRect.Left);

     var brush = new SolidColorBrush(Windows.UI.ColorHelper.FromArgb(255, 0, 0, 255));
     ellipse.Stroke = brush;
     ellipse.StrokeThickness = 2;
     recognitionCanvas.Children.Add(ellipse);
 }

 // Draw a polygon on the recognitionCanvas.
 private void DrawPolygon(InkAnalysisInkDrawing shape)
 {
     List<Point> points = new List<Point>(shape.Points);
     Polygon polygon = new Polygon();

     foreach (Point point in points)
     {
         polygon.Points.Add(point);
     }

     var brush = new SolidColorBrush(Windows.UI.ColorHelper.FromArgb(255, 0, 0, 255));
     polygon.Stroke = brush;
     polygon.StrokeThickness = 2;
     recognitionCanvas.Children.Add(polygon);
 }

以下是此動作中的範例：

分析之前	分析之後

限制手寫辨識

在上一節中 (使用筆跡分析進行自由格式辨識)，我們示範如何使用筆跡分析 API 來分析和辨識 InkCanvas 區域內的任意筆跡筆劃。

在本節中，我們將示範如何使用 Windows Ink 手寫辨識引擎 (而非筆跡分析) 將 InkCanvas 上的一組筆劃轉換成文字 (根據已安裝的預設語言套件)。

注意

本節中顯示的基本手寫辨識最適合單行文字輸入案例 (例如表單輸入)。如需更豐富的辨識案例，包括文件結構、清單專案、圖形和繪圖的分析與解譯 (除了文字辨識之外)，請參閱上一節：使用筆跡分析進行自由格式辨識。

在此範例中，當使用者按一下按鈕以指出完成書寫時，就會起始辨識。

從筆跡手寫辨識範例下載此範例

首先，我們會設定 UI。

UI 包含 [辨識] 按鈕、InkCanvas 和顯示辨識結果的區域。

<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
     <Grid.RowDefinitions>
         <RowDefinition Height="Auto"/>
         <RowDefinition Height="*"/>
     </Grid.RowDefinitions>
     <StackPanel x:Name="HeaderPanel"
                 Orientation="Horizontal"
                 Grid.Row="0">
             <TextBlock x:Name="Header"
                 Text="Basic ink recognition sample"
                 Style="{ThemeResource HeaderTextBlockStyle}"
                 Margin="10,0,0,0" />
             <Button x:Name="recognize"
                 Content="Recognize"
                 Margin="50,0,10,0"/>
     </StackPanel>
     <Grid Grid.Row="1">
         <Grid.RowDefinitions>
             <RowDefinition Height="*"/>
             <RowDefinition Height="Auto"/>
         </Grid.RowDefinitions>
         <InkCanvas x:Name="inkCanvas"
             Grid.Row="0"/>
         <TextBlock x:Name="recognitionResult"
             Grid.Row="1"
             Margin="50,0,10,0"/>
     </Grid>
 </Grid>

在此範例中，您必須先新增筆跡功能所需的命名空間類型參考：
- Windows.UI.Input
- Windows.UI.Input.Inking

然後，我們會設定一些基本的筆跡輸入行為。

InkPresenter 配置為將來自筆和滑鼠的輸入資料解釋為筆跡筆劃 (InputDeviceTypes)。筆跡筆劃會使用指定的 InkDrawingAttributes 在 InkCanvas 上轉譯。也會宣告「辨識」按鈕上 Click 事件的接聽程式。

public MainPage()
    {
        this.InitializeComponent();

        // Set supported inking device types.
        inkCanvas.InkPresenter.InputDeviceTypes =
            Windows.UI.Core.CoreInputDeviceTypes.Mouse |
            Windows.UI.Core.CoreInputDeviceTypes.Pen;

        // Set initial ink stroke attributes.
        InkDrawingAttributes drawingAttributes = new InkDrawingAttributes();
        drawingAttributes.Color = Windows.UI.Colors.Black;
        drawingAttributes.IgnorePressure = false;
        drawingAttributes.FitToCurve = true;
        inkCanvas.InkPresenter.UpdateDefaultDrawingAttributes(drawingAttributes);

        // Listen for button click to initiate recognition.
        recognize.Click += Recognize_Click;
    }

最後，我們會執行基本的手寫辨識。在此範例中，我們使用 [辨識] 按鈕的 click 事件處理常式來執行手寫辨識。

InkPresenter 將所有筆跡筆劃儲存在 InkStrokeContainer 物件中。筆劃透過 InkPresenter 的 StrokeContainer 屬性公開，並使用 GetStrokes 方法檢索。

// Get all strokes on the InkCanvas.
    IReadOnlyList<InkStroke> currentStrokes = inkCanvas.InkPresenter.StrokeContainer.GetStrokes();

建立 InkRecognizerContainer 來管理手寫辨識程序。

// Create a manager for the InkRecognizer object
    // used in handwriting recognition.
    InkRecognizerContainer inkRecognizerContainer =
        new InkRecognizerContainer();

會呼叫 RecognizeAsync 來擷取一組 InkRecognitionResult 物件。辨識結果會針對 InkRecognizer 偵測到的每個字產生。

// Recognize all ink strokes on the ink canvas.
    IReadOnlyList<InkRecognitionResult> recognitionResults =
        await inkRecognizerContainer.RecognizeAsync(
            inkCanvas.InkPresenter.StrokeContainer,
            InkRecognitionTarget.All);

每個 InkRecognitionResult 物件都包含一組文字候選項目。此清單中的最上層專案會被視為辨識引擎的最佳相符項目，後面接著剩餘的候選項目，以降低信賴度。

我們會逐一查看每個 InkRecognitionResult，並編譯候選項目清單。然後會顯示候選項目，並清除 InkStrokeContainer (這也清除 InkCanvas)。

string str = "Recognition result\n";
    // Iterate through the recognition results.
    foreach (var result in recognitionResults)
    {
        // Get all recognition candidates from each recognition result.
        IReadOnlyList<string> candidates = result.GetTextCandidates();
        str += "Candidates: " + candidates.Count.ToString() + "\n";
        foreach (string candidate in candidates)
        {
            str += candidate + " ";
        }
    }
    // Display the recognition candidates.
    recognitionResult.Text = str;
    // Clear the ink canvas once recognition is complete.
    inkCanvas.InkPresenter.StrokeContainer.Clear();

以下是完整按一下處理常式範例。

// Handle button click to initiate recognition.
    private async void Recognize_Click(object sender, RoutedEventArgs e)
    {
        // Get all strokes on the InkCanvas.
        IReadOnlyList<InkStroke> currentStrokes = inkCanvas.InkPresenter.StrokeContainer.GetStrokes();

        // Ensure an ink stroke is present.
        if (currentStrokes.Count > 0)
        {
            // Create a manager for the InkRecognizer object
            // used in handwriting recognition.
            InkRecognizerContainer inkRecognizerContainer =
                new InkRecognizerContainer();

            // inkRecognizerContainer is null if a recognition engine is not available.
            if (!(inkRecognizerContainer == null))
            {
                // Recognize all ink strokes on the ink canvas.
                IReadOnlyList<InkRecognitionResult> recognitionResults =
                    await inkRecognizerContainer.RecognizeAsync(
                        inkCanvas.InkPresenter.StrokeContainer,
                        InkRecognitionTarget.All);
                // Process and display the recognition results.
                if (recognitionResults.Count > 0)
                {
                    string str = "Recognition result\n";
                    // Iterate through the recognition results.
                    foreach (var result in recognitionResults)
                    {
                        // Get all recognition candidates from each recognition result.
                        IReadOnlyList<string> candidates = result.GetTextCandidates();
                        str += "Candidates: " + candidates.Count.ToString() + "\n";
                        foreach (string candidate in candidates)
                        {
                            str += candidate + " ";
                        }
                    }
                    // Display the recognition candidates.
                    recognitionResult.Text = str;
                    // Clear the ink canvas once recognition is complete.
                    inkCanvas.InkPresenter.StrokeContainer.Clear();
                }
                else
                {
                    recognitionResult.Text = "No recognition results.";
                }
            }
            else
            {
                Windows.UI.Popups.MessageDialog messageDialog = new Windows.UI.Popups.MessageDialog("You must install handwriting recognition engine.");
                await messageDialog.ShowAsync();
            }
        }
        else
        {
            recognitionResult.Text = "No ink strokes to recognize.";
        }
    }

國際辨識

Windows 筆跡平台內建的手寫辨識包含 Windows 所支援地區設定和語言的廣泛子集。

如需 InkRecognizer 支援的語言清單，請參閱 InkRecognizer.Name 屬性主題。

您的應用程式可以查詢已安裝的手寫辨識引擎集，並使用其中一個引擎，或讓使用者選取他們慣用的語言。

注意：使用者可以前往設定 - >時間&語言來查看已安裝的語言清單。已安裝的語言列在 [語言] 底下。

若要安裝新的語言套件，並啟用該語言的手寫辨識：

前往設定>時間&語言>區域&語言。
選取新增語言。
從清單中選取語言，然後選擇區域版本。語言現在會列在 [區域&語言] 頁面上。
按一下語言，然後選取 [選項]。
在 [語言選項] 頁面上，下載手寫辨識引擎 (您也可以在此處下載完整的語言套件、語音辨識引擎和鍵盤配置)。

在此處，我們將示範如何使用手寫辨識引擎，根據選取的識別器來解譯 InkCanvas 上的一組筆劃。

當使用者完成寫入時，按一下按鈕就會起始辨識。

首先，我們會設定 UI。

UI 包含 [辨識] 按鈕、列出所有已安裝手寫識別器的下拉式方塊、InkCanvas，以及顯示辨識結果的區域。

<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
        <StackPanel x:Name="HeaderPanel"
                    Orientation="Horizontal"
                    Grid.Row="0">
            <TextBlock x:Name="Header"
                       Text="Advanced international ink recognition sample"
                       Style="{ThemeResource HeaderTextBlockStyle}"
                       Margin="10,0,0,0" />
            <ComboBox x:Name="comboInstalledRecognizers"
                     Margin="50,0,10,0">
                <ComboBox.ItemTemplate>
                    <DataTemplate>
                        <StackPanel Orientation="Horizontal">
                            <TextBlock Text="{Binding Name}" />
                        </StackPanel>
                    </DataTemplate>
                </ComboBox.ItemTemplate>
            </ComboBox>
            <Button x:Name="buttonRecognize"
                    Content="Recognize"
                    IsEnabled="False"
                    Margin="50,0,10,0"/>
        </StackPanel>
        <Grid Grid.Row="1">
            <Grid.RowDefinitions>
                <RowDefinition Height="*"/>
                <RowDefinition Height="Auto"/>
            </Grid.RowDefinitions>
            <InkCanvas x:Name="inkCanvas"
                       Grid.Row="0"/>
            <TextBlock x:Name="recognitionResult"
                       Grid.Row="1"
                       Margin="50,0,10,0"/>
        </Grid>
    </Grid>

然後，我們會設定一些基本的筆跡輸入行為。

InkPresenter 配置為將來自筆和滑鼠的輸入資料解釋為筆跡筆劃 (InputDeviceTypes)。筆跡筆劃會使用指定的 InkDrawingAttributes 在 InkCanvas 上轉譯。

我們呼叫InitializeRecognizerList函式來填入識別器下拉式方塊，其中包含已安裝的手寫識別器清單。

我們也會在 [辨識] 按鈕上宣告 Click 事件的接聽程式，並在識別器下拉式方塊上宣告選取範圍變更事件。

 public MainPage()
 {
    this.InitializeComponent();

    // Set supported inking device types.
    inkCanvas.InkPresenter.InputDeviceTypes =
        Windows.UI.Core.CoreInputDeviceTypes.Mouse |
        Windows.UI.Core.CoreInputDeviceTypes.Pen;

    // Set initial ink stroke attributes.
    InkDrawingAttributes drawingAttributes = new InkDrawingAttributes();
    drawingAttributes.Color = Windows.UI.Colors.Black;
    drawingAttributes.IgnorePressure = false;
    drawingAttributes.FitToCurve = true;
    inkCanvas.InkPresenter.UpdateDefaultDrawingAttributes(drawingAttributes);

    // Populate the recognizer combo box with installed recognizers.
    InitializeRecognizerList();

    // Listen for combo box selection.
    comboInstalledRecognizers.SelectionChanged +=
        comboInstalledRecognizers_SelectionChanged;

    // Listen for button click to initiate recognition.
    buttonRecognize.Click += Recognize_Click;
}

我們會在識別器下拉式方塊中填入已安裝手寫識別器的清單。

建立 InkRecognizerContainer 來管理手寫辨識程序。使用此物件呼叫 GetRecognizers 並擷取已安裝的識別器清單，以填入識別器下拉式方塊。

// Populate the recognizer combo box with installed recognizers.
private void InitializeRecognizerList()
{
    // Create a manager for the handwriting recognition process.
    inkRecognizerContainer = new InkRecognizerContainer();
    // Retrieve the collection of installed handwriting recognizers.
    IReadOnlyList<InkRecognizer> installedRecognizers =
        inkRecognizerContainer.GetRecognizers();
    // inkRecognizerContainer is null if a recognition engine is not available.
    if (!(inkRecognizerContainer == null))
    {
        comboInstalledRecognizers.ItemsSource = installedRecognizers;
        buttonRecognize.IsEnabled = true;
    }
}

如果識別器下拉式方塊選取範圍變更，請更新手寫識別器。

使用 InkRecognizerContainer 根據從識別器下拉式方塊中選取的識別器呼叫 SetDefaultRecognizer。

// Handle recognizer change.
    private void comboInstalledRecognizers_SelectionChanged(
        object sender, SelectionChangedEventArgs e)
    {
        inkRecognizerContainer.SetDefaultRecognizer(
            (InkRecognizer)comboInstalledRecognizers.SelectedItem);
    }

最後，我們會根據選取的手寫識別器來執行手寫辨識。在此範例中，我們使用 [辨識] 按鈕的 click 事件處理常式來執行手寫辨識。

InkPresenter 將所有筆跡筆劃儲存在 InkStrokeContainer 物件中。筆劃透過 InkPresenter 的 StrokeContainer 屬性公開，並使用 GetStrokes 方法檢索。

// Get all strokes on the InkCanvas.
    IReadOnlyList<InkStroke> currentStrokes =
        inkCanvas.InkPresenter.StrokeContainer.GetStrokes();

會呼叫 RecognizeAsync 來擷取一組 InkRecognitionResult 物件。

辨識結果會針對 InkRecognizer 偵測到的每個字產生。

// Recognize all ink strokes on the ink canvas.
IReadOnlyList<InkRecognitionResult> recognitionResults =
    await inkRecognizerContainer.RecognizeAsync(
        inkCanvas.InkPresenter.StrokeContainer,
        InkRecognitionTarget.All);

每個 InkRecognitionResult 物件都包含一組文字候選項目。此清單中的最上層專案會被視為辨識引擎的最佳相符項目，後面接著剩餘的候選項目，以降低信賴度。

我們會逐一查看每個 InkRecognitionResult，並編譯候選項目清單。然後會顯示候選項目，並清除 InkStrokeContainer (這也清除 InkCanvas)。

string str = "Recognition result\n";
// Iterate through the recognition results.
foreach (InkRecognitionResult result in recognitionResults)
{
        // Get all recognition candidates from each recognition result.
        IReadOnlyList<string> candidates =
            result.GetTextCandidates();
        str += "Candidates: " + candidates.Count.ToString() + "\n";
        foreach (string candidate in candidates)
        {
            str += candidate + " ";
        }
}
// Display the recognition candidates.
recognitionResult.Text = str;
// Clear the ink canvas once recognition is complete.
inkCanvas.InkPresenter.StrokeContainer.Clear();

以下是完整按一下處理常式範例。

// Handle button click to initiate recognition.
private async void Recognize_Click(object sender, RoutedEventArgs e)
{
    // Get all strokes on the InkCanvas.
    IReadOnlyList<InkStroke> currentStrokes =
        inkCanvas.InkPresenter.StrokeContainer.GetStrokes();

    // Ensure an ink stroke is present.
    if (currentStrokes.Count > 0)
    {
        // inkRecognizerContainer is null if a recognition engine is not available.
        if (!(inkRecognizerContainer == null))
        {
            // Recognize all ink strokes on the ink canvas.
            IReadOnlyList<InkRecognitionResult> recognitionResults =
                await inkRecognizerContainer.RecognizeAsync(
                    inkCanvas.InkPresenter.StrokeContainer,
                    InkRecognitionTarget.All);
            // Process and display the recognition results.
            if (recognitionResults.Count > 0)
            {
                string str = "Recognition result\n";
                // Iterate through the recognition results.
                foreach (InkRecognitionResult result in recognitionResults)
                {
                    // Get all recognition candidates from each recognition result.
                    IReadOnlyList<string> candidates =
                        result.GetTextCandidates();
                    str += "Candidates: " + candidates.Count.ToString() + "\n";
                    foreach (string candidate in candidates)
                    {
                        str += candidate + " ";
                    }
                }
                // Display the recognition candidates.
                recognitionResult.Text = str;
                // Clear the ink canvas once recognition is complete.
                inkCanvas.InkPresenter.StrokeContainer.Clear();
            }
            else
            {
                recognitionResult.Text = "No recognition results.";
            }
        }
        else
        {
            Windows.UI.Popups.MessageDialog messageDialog =
                new Windows.UI.Popups.MessageDialog(
                    "You must install handwriting recognition engine.");
            await messageDialog.ShowAsync();
        }
    }
    else
    {
        recognitionResult.Text = "No ink strokes to recognize.";
    }
}

動態辨識

雖然上述兩個範例會要求使用者按下按鈕來開始辨識，您也可以使用與基本計時函式配對的筆劃輸入來執行動態辨識。

在此範例中，我們將使用與先前的國際辨識範例相同的 UI 和筆劃設定。

這些全域物件 (InkAnalyzer、InkStroke、InkAnalysisResult、DispatcherTimer) 會在整個應用程式中使用。
```
// Stroke recognition globals.
InkAnalyzer inkAnalyzer;
DispatcherTimer recoTimer;
```

我們不是起始辨識的按鈕，而是新增兩個 InkPresenter 筆劃事件的接聽程式 (StrokesCollected 和 StrokeStarted)，並使用一秒的 Tick 間隔設定基本計時器 (DispatcherTimer)。

public MainPage()
{
    this.InitializeComponent();

    // Set supported inking device types.
    inkCanvas.InkPresenter.InputDeviceTypes =
        Windows.UI.Core.CoreInputDeviceTypes.Mouse |
        Windows.UI.Core.CoreInputDeviceTypes.Pen;

    // Listen for stroke events on the InkPresenter to 
    // enable dynamic recognition.
    // StrokesCollected is fired when the user stops inking by 
    // lifting their pen or finger, or releasing the mouse button.
    inkCanvas.InkPresenter.StrokesCollected += inkCanvas_StrokesCollected;
    // StrokeStarted is fired when ink input is first detected.
    inkCanvas.InkPresenter.StrokeInput.StrokeStarted +=
        inkCanvas_StrokeStarted;

    inkAnalyzer = new InkAnalyzer();

    // Timer to manage dynamic recognition.
    recoTimer = new DispatcherTimer();
    recoTimer.Interval = TimeSpan.FromSeconds(1);
    recoTimer.Tick += recoTimer_TickAsync;
}

接著，我們會定義我們在第一個步驟中宣告的 InkPresenter 事件的處理常式 (我們也覆寫 OnNavigatingFrom 頁面事件來管理計時器)。

StrokesCollected
將筆跡筆劃 (AddDataForStrokes) 新增至 InkAnalyzer，並在使用者停止筆跡時啟動辨識計時器 (舉起手寫筆或手指或放開滑鼠按鈕)。在第一秒沒有筆跡輸入之後，就會起始辨識。

使用 SetStrokeDataKind 方法來指定您只對文字感興趣 (包括檔案結構和項目符號清單) 或只在繪圖中 (包括圖形辨識)。
StrokeStarted
如果新的筆劃在下一個計時器刻度事件之前開始，請停止計時器，因為新的筆劃可能是單一手寫項目的接續。

// Handler for the InkPresenter StrokeStarted event.
// Don't perform analysis while a stroke is in progress.
// If a new stroke starts before the next timer tick event,
// stop the timer as the new stroke is likely the continuation
// of a single handwriting entry.
private void inkCanvas_StrokeStarted(InkStrokeInput sender, PointerEventArgs args)
{
    recoTimer.Stop();
}
// Handler for the InkPresenter StrokesCollected event.
// Stop the timer and add the collected strokes to the InkAnalyzer.
// Start the recognition timer when the user stops inking (by 
// lifting their pen or finger, or releasing the mouse button).
// If ink input is not detected after one second, initiate recognition.
private void inkCanvas_StrokesCollected(InkPresenter sender, InkStrokesCollectedEventArgs args)
{
    recoTimer.Stop();
    // If you're only interested in a specific type of recognition,
    // such as writing or drawing, you can constrain recognition 
    // using the SetStrokDataKind method, which can improve both 
    // efficiency and recognition results.
    // In this example, "InkAnalysisStrokeKind.Writing" is used.
    foreach (var stroke in args.Strokes)
    {
        inkAnalyzer.AddDataForStroke(stroke);
        inkAnalyzer.SetStrokeDataKind(stroke.Id, InkAnalysisStrokeKind.Writing);
    }
    recoTimer.Start();
}
// Override the Page OnNavigatingFrom event handler to 
// stop our timer if user leaves page.
protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
{
    recoTimer.Stop();
}

最後，我們會執行手寫辨識。在此範例中，我們使用 DispatcherTimer 的 Tick 事件處理常式來起始手寫辨識。

呼叫 AnalyzeAsync 以起始筆跡分析並取得 InkAnalysisResult。
如果 Status 傳回 Updated 的狀態，請針對 InkAnalysisNodeKind.InkWord 的節點類型呼叫 FindNodes。
逐一查看節點並顯示已辨識的文字。
最後，從 InkAnalyzer 刪除已辨識的節點，並從筆跡畫布中刪除對應的筆跡筆劃。

private async void recoTimer_TickAsync(object sender, object e)
{
    recoTimer.Stop();
    if (!inkAnalyzer.IsAnalyzing)
    {
        InkAnalysisResult result = await inkAnalyzer.AnalyzeAsync();

        // Have ink strokes on the canvas changed?
        if (result.Status == InkAnalysisStatus.Updated)
        {
            // Find all strokes that are recognized as handwriting and 
            // create a corresponding ink analysis InkWord node.
            var inkwordNodes =
                inkAnalyzer.AnalysisRoot.FindNodes(
                    InkAnalysisNodeKind.InkWord);

            // Iterate through each InkWord node.
            // Display the primary recognized text (for this example, 
            // we ignore alternatives), and then delete the 
            // ink analysis data and recognized strokes.
            foreach (InkAnalysisInkWord node in inkwordNodes)
            {
                string recognizedText = node.RecognizedText;
                // Display the recognition candidates.
                recognitionResult.Text = recognizedText;

                foreach (var strokeId in node.GetStrokeIds())
                {
                    var stroke =
                        inkCanvas.InkPresenter.StrokeContainer.GetStrokeById(strokeId);
                    stroke.Selected = true;
                }
                inkAnalyzer.RemoveDataForStrokes(node.GetStrokeIds());
            }
            inkCanvas.InkPresenter.StrokeContainer.DeleteSelected();
        }
    }
    else
    {
        // Ink analyzer is busy. Wait a while and try again.
        recoTimer.Start();
    }
}

手寫筆互動

共用方式為

將 Windows Ink 筆劃辨識為文字和圖案 \(部分機器翻譯\)

使用筆跡分析進行自由格式辨識

限制手寫辨識

國際辨識

動態辨識

主題範例

其他範例

其他資源

共用方式為

將 Windows Ink 筆劃辨識為文字和圖案 \(部分機器翻譯\)

使用筆跡分析進行自由格式辨識

限制手寫辨識

國際辨識

動態辨識

相關文章

主題範例

其他範例

其他資源