光学控件Aspose.OMR教程（4）：.NET 中的 C# 光学标记识别 (OMR) 软件

(一) C# 光学标记识别 (OMR) 软件的特点

我们的光学标记识别 (OMR) 软件将具有以下功能：

1. 交互式调整识别参数并实时观察其效果。我们可以调整以下内容：
   • 识别阈值
   • 飞涨
   • 显示/隐藏气泡
2. 选择并加载以下格式的扫描图像：
   • PNG
   • JPG/JPEG
   • 动图
   • TIF/TIFF
3. 识别图像上的光学标记。
4. 以 CSV 格式导出结果并将其保存到本地磁盘。

(二) C# 光学标记识别 .NET API 和 UI 控制

Aspose.OMR for .NET API 允许设计、创建和识别答题卡、测试、MCQ 试卷、测验、反馈表、调查和选票。此外，它还提供了一个图形用户界面控件，可以添加到 .NET UI 应用程序中。我们将在 .NET UI 应用程序中集成 Aspose.OMR for .NET UI 控件，以开发 OMR 扫描仪/阅读器应用程序。请下载API 的 DLL 或使用NuGet安装它。

PM> Install-Package Aspose.OMR

(三) 开发 OMR 软件的步骤

我们可以按照以下步骤开发基于 GUI 的 OMR 扫描仪/阅读器应用程序：

• 首先，创建一个新项目并选择WPF App (.NET Framework)项目模板。

• 接下来，在Configure your new project对话框中，输入Project name，选择Location并设置其他参数。

• 然后，打开NuGet 包管理器并安装Aspose.OMR for .NET包。

• 接下来，将新文件DialogHelper.cs添加到项目中。

• 将以下代码添加到新创建的DialogHelper.cs中。

internal class DialogHelper{/// <summary>/// The filter string for the dialog that opens template images./// </summary>private static readonly string ImageFilesFilterPrompt = "Image files |*.jpg; *.jpeg; *.png; *.gif; *.tif; *.tiff;";/// <summary>/// The filter string for the dialog that saves recognition results/// </summary>private static readonly string DataExportFilesFilterPrompt = "Comma-Separated Values (*.csv)" + " | *.csv";/// <summary>/// Shows Open Image file dialog./// </summary>/// <returns>Path to selected file, or <c>null</c> if no file was selected.</returns>public static string ShowOpenImageDialog(string suggestedDir = null){OpenFileDialog dialog = new OpenFileDialog();return ShowDialog(dialog, ImageFilesFilterPrompt, suggestedDir);}/// <summary>/// Shows Save Recognition Results file dialog./// </summary>/// <returns>Path to selected file, or <c>null</c> if no file was selected.</returns>public static string ShowSaveDataDialog(string suggestedName){SaveFileDialog dialog = new SaveFileDialog();return ShowDialog(dialog, DataExportFilesFilterPrompt, suggestedName);}/// <summary>/// Displays given dialog and returns its result as a <c>string</c>./// </summary>/// <param name="dialog">The dialog to show.</param>/// <param name="filter">File type filter string.</param>/// <param name="suggestedDir">Suggested dialog initial directory</param>/// <param name="suggestedName">Suggested file name</param>/// <returns>Path to selected file, or <c>null</c> if no file was selected.</returns>private static string ShowDialog(FileDialog dialog, string filter, string suggestedDir = null, string suggestedName = null){string fileName = null;dialog.Filter = filter;dialog.RestoreDirectory = true;if (suggestedName != null){dialog.FileName = suggestedName;}if (suggestedDir != null){dialog.InitialDirectory = suggestedDir;}boolresult = dialog.ShowDialog();if (result == true){fileName = dialog.FileName;}return fileName;}}

• 接下来，使用以下 XAML 内容更新MainWindow.xaml文件。

<Window x_Class="OMR_APP.MainWindow"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"xmlns:local="clr-namespace:OMR_APP"mc:Ignorable="d"Title="Aspose OMR Demo" Height="880" Width="1100"><Grid Background="WhiteSmoke"><Grid.RowDefinitions><RowDefinition Height="40"></RowDefinition><RowDefinition Height="*"></RowDefinition></Grid.RowDefinitions><ToolBar Grid.Row="0" Background="LightGray"><TextBox Name="txtTemplatePath" Margin="5" Width="400" Height="30" Background="White"HorizontalContentAlignment="Center" VerticalContentAlignment="Center"></TextBox><Button Margin="5" Width="100" Height="30" Background="White"Content="Get control" HorizontalContentAlignment="Center" VerticalContentAlignment="Center"Click="GetButtonClicked"/><Separator/><Button Margin="5" Width="100" Height="30" Background="White"Content="Select Image" Click="SelectImageClicked"/><Button Margin="5" Width="100" Height="30" Background="White"Content="Recognize Image" Click="RecognizeImageClicked"/><Button Margin="5" Width="100" Height="30" Background="White"Content="Export Results" Click="ExportResultsClicked"/></ToolBar><ContentControl Grid.Row="1" x_Name="CustomContentControl"HorizontalAlignment="Center" VerticalAlignment="Center"/></Grid></Window>view rawOMR-Software-CSharp_MainWindow.xaml hosted with by GitHub之后，替换MainWindow.xaml.cs文件中的以下内容。/// <summary>/// Template for testing/// </summary>private static readonly string TemplateFilePath = @"C:FilesOMRSheet.omr";/// <summary>/// Path to the license Aspose.OMR.NET.lic file/// </summary>private static readonly string LicensePath = @"";private CorrectionControl control;public MainWindow(){InitializeComponent();// Set and show template file pathtxtTemplatePath.Text = TemplateFilePath;// Set license, provide License file Path and uncomment to test full results//License lic = new License();//lic.SetLicense(LicensePath);}public string UserImagePath { get; set; }public string DataFolderPath { get; set; }/// <summary>/// Loads and displays CorrectionControl/// </summary>private void GetButtonClicked(object sender, RoutedEventArgs e){string path = txtTemplatePath.Text;try{OmrEngine engine = new OmrEngine();TemplateProcessor processor = engine.GetTemplateProcessor(path);control = engine.GetCorrectionControl(processor);CustomContentControl.Content = control;control.Initialize();}catch (Exception ex){MessageBox.Show(ex.Message,"Exception");}}/// <summary>/// Select and display image/// </summary>private void SelectImageClicked(object sender, RoutedEventArgs e){if (control == null){return;}string imagePath = DialogHelper.ShowOpenImageDialog(this.DataFolderPath);if (string.IsNullOrEmpty(imagePath)){return;}this.UserImagePath = imagePath;control.LoadAndDisplayImage(imagePath);}/// <summary>/// Recognize loaded image/// </summary>private void RecognizeImageClicked(object sender, RoutedEventArgs e){if (control == null){return;}control.RecognizeImage();}/// <summary>/// Export results to CSV/// </summary>private void ExportResultsClicked(object sender, RoutedEventArgs e){if (control == null){return;}string imageName = Path.GetFileNameWithoutExtension(this.UserImagePath);string path = DialogHelper.ShowSaveDataDialog(imageName);if (string.IsNullOrEmpty(path)){return;}control.ExportResults(path);MessageBox.Show("The exported resultant CSV file can be found here : " + path, "Operation Successful");}

• 最后，运行应用程序。

(四) C# 光学标记识别 (OMR) 软件演示

以下是我们刚刚创建的 OMR Scanner/Reader 应用程序的演示。

(五) 结论

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