VintaSoft Twain .NET SDK 14.1: Руководство для .NET разработчика
В этом разделе
    Как обработать TWAIN отсканированное изображение?
    В этом разделе
    Вот C#/VB.NET код, который демонстрирует, как получить изображения с TWAIN устройства, обработать отсканированные изображения и сохранить в многостраничном файле TIFF только не пустые изображения:

    /// <summary>
    /// Acquires images from TWAIN device, processes images and saves only not blank images to a multipage TIFF file.
    /// </summary>
    public static void AcquireImagesFromTwainDeviceAndProcessImages()
    {
        // create the device manager
        using (Vintasoft.Twain.DeviceManager deviceManager = new Vintasoft.Twain.DeviceManager())
        {
            // open the device manager
            deviceManager.Open();
    
            // select the device in the default device selectio ndialog
            deviceManager.ShowDefaultDeviceSelectionDialog();
    
            // get reference to the selected device
            Vintasoft.Twain.Device device = deviceManager.DefaultDevice;
    
            // specify that device UI must not be used
            device.ShowUI = false;
            // specify that device must be closed after scan
            device.DisableAfterAcquire = true;
    
            string tiffFilename = System.IO.Path.Combine(System.IO.Directory.GetCurrentDirectory(), "multipage.tif");
    
            // acquire images from device
            Vintasoft.Twain.AcquireModalState acquireModalState = Vintasoft.Twain.AcquireModalState.None;
            Vintasoft.Twain.AcquiredImage acquiredImage;
            do
            {
                acquireModalState = device.AcquireModal();
                switch (acquireModalState)
                {
                    case Vintasoft.Twain.AcquireModalState.ImageAcquired:
                        // get reference to the image acquired from device
                        acquiredImage = device.AcquiredImage;
    
                        // despeckle/deskew/detect border
                        ProcessAcquiredImage(acquiredImage);
                        // add image to multipage TIFF file if image is not blank
                        if (!acquiredImage.IsBlank(0.01f))
                            acquiredImage.Save(tiffFilename);
    
                        // dispose acquired image
                        acquiredImage.Dispose();
                        break;
                }
            }
            while (acquireModalState != Vintasoft.Twain.AcquireModalState.None);
    
            // close the device
            device.Close();
    
            // close the device manager
            deviceManager.Close();
        }
    }
    
    private static void ProcessAcquiredImage(Vintasoft.Twain.AcquiredImage acquiredImage)
    {
        System.Console.WriteLine(string.Format("Image ({0})", acquiredImage.ImageInfo));
    
        try
        {
            // subscribe to processing events
            acquiredImage.Processing += new System.EventHandler<Vintasoft.Twain.ImageProcessing.TwainAcquiredImageProcessingEventArgs>(acquiredImage_Processing);
            acquiredImage.Progress += new System.EventHandler<Vintasoft.Twain.ImageProcessing.TwainAcquiredImageProcessingProgressEventArgs>(acquiredImage_Progress);
            acquiredImage.Processed += new System.EventHandler<Vintasoft.Twain.ImageProcessing.TwainAcquiredImageProcessedEventArgs>(acquiredImage_Processed);
    
            // despeckle/deskew/detect border
            acquiredImage.Despeckle(8, 25, 30, 400);
            acquiredImage.Deskew(Vintasoft.Twain.ImageProcessing.TwainBorderColor.AutoDetect, 5, 5);
            acquiredImage.DetectBorder(5);
        }
        catch (System.Exception ex)
        {
            System.Console.WriteLine("Error: " + ex.Message);
        }
        finally
        {
            // unsubscribe from processing events
            acquiredImage.Processing -= new System.EventHandler<Vintasoft.Twain.ImageProcessing.TwainAcquiredImageProcessingEventArgs>(acquiredImage_Processing);
            acquiredImage.Progress -= new System.EventHandler<Vintasoft.Twain.ImageProcessing.TwainAcquiredImageProcessingProgressEventArgs>(acquiredImage_Progress);
            acquiredImage.Processed -= new System.EventHandler<Vintasoft.Twain.ImageProcessing.TwainAcquiredImageProcessedEventArgs>(acquiredImage_Processed);
        }
    }
    
    static void acquiredImage_Processing(object sender, Vintasoft.Twain.ImageProcessing.TwainAcquiredImageProcessingEventArgs e)
    {
        System.Console.Write(e.Action.ToString() + " ");
    }
    
    static void acquiredImage_Progress(object sender, Vintasoft.Twain.ImageProcessing.TwainAcquiredImageProcessingProgressEventArgs e)
    {
        System.Console.Write(".");
    }
    
    static void acquiredImage_Processed(object sender, Vintasoft.Twain.ImageProcessing.TwainAcquiredImageProcessedEventArgs e)
    {
        System.Console.WriteLine(" finished");
    }
    
    ''' <summary>
    ''' Acquires images from TWAIN device, processes images and saves only not blank images to a multipage TIFF file.
    ''' </summary>
    Public Shared Sub AcquireImagesFromTwainDeviceAndProcessImages()
            ' create the device manager
            Using deviceManager As New Vintasoft.Twain.DeviceManager()
                    ' open the device manager
                    deviceManager.Open()
    
                    ' select the device in the default device selectio ndialog
                    deviceManager.ShowDefaultDeviceSelectionDialog()
    
                    ' get reference to the selected device
                    Dim device As Vintasoft.Twain.Device = deviceManager.DefaultDevice
    
                    ' specify that device UI must not be used
                    device.ShowUI = False
                    ' specify that device must be closed after scan
                    device.DisableAfterAcquire = True
    
                    Dim tiffFilename As String = System.IO.Path.Combine(System.IO.Directory.GetCurrentDirectory(), "multipage.tif")
    
                    ' acquire images from device
                    Dim acquireModalState As Vintasoft.Twain.AcquireModalState = Vintasoft.Twain.AcquireModalState.None
                    Dim acquiredImage As Vintasoft.Twain.AcquiredImage
                    Do
                            acquireModalState = device.AcquireModal()
                            Select Case acquireModalState
                                    Case Vintasoft.Twain.AcquireModalState.ImageAcquired
                                            ' get reference to the image acquired from device
                                            acquiredImage = device.AcquiredImage
    
                                            ' despeckle/deskew/detect border
                                            ProcessAcquiredImage(acquiredImage)
                                            ' add image to multipage TIFF file if image is not blank
                                            If Not acquiredImage.IsBlank(0.01F) Then
                                                    acquiredImage.Save(tiffFilename)
                                            End If
    
                                            ' dispose acquired image
                                            acquiredImage.Dispose()
                                            Exit Select
                            End Select
                    Loop While acquireModalState <> Vintasoft.Twain.AcquireModalState.None
    
                    ' close the device
                    device.Close()
    
                    ' close the device manager
                    deviceManager.Close()
            End Using
    End Sub
    
    Private Shared Sub ProcessAcquiredImage(acquiredImage As Vintasoft.Twain.AcquiredImage)
            System.Console.WriteLine(String.Format("Image ({0})", acquiredImage.ImageInfo))
    
            Try
                    ' subscribe to processing events
                    AddHandler acquiredImage.Processing, New System.EventHandler(Of Vintasoft.Twain.ImageProcessing.TwainAcquiredImageProcessingEventArgs)(AddressOf acquiredImage_Processing)
                    AddHandler acquiredImage.Progress, New System.EventHandler(Of Vintasoft.Twain.ImageProcessing.TwainAcquiredImageProcessingProgressEventArgs)(AddressOf acquiredImage_Progress)
                    AddHandler acquiredImage.Processed, New System.EventHandler(Of Vintasoft.Twain.ImageProcessing.TwainAcquiredImageProcessedEventArgs)(AddressOf acquiredImage_Processed)
    
                    ' despeckle/deskew/detect border
                    acquiredImage.Despeckle(8, 25, 30, 400)
                    acquiredImage.Deskew(Vintasoft.Twain.ImageProcessing.TwainBorderColor.AutoDetect, 5, 5)
                    acquiredImage.DetectBorder(5)
            Catch ex As System.Exception
                    System.Console.WriteLine("Error: " & ex.Message)
            Finally
                    ' unsubscribe from processing events
                    RemoveHandler acquiredImage.Processing, New System.EventHandler(Of Vintasoft.Twain.ImageProcessing.TwainAcquiredImageProcessingEventArgs)(AddressOf acquiredImage_Processing)
                    RemoveHandler acquiredImage.Progress, New System.EventHandler(Of Vintasoft.Twain.ImageProcessing.TwainAcquiredImageProcessingProgressEventArgs)(AddressOf acquiredImage_Progress)
                    RemoveHandler acquiredImage.Processed, New System.EventHandler(Of Vintasoft.Twain.ImageProcessing.TwainAcquiredImageProcessedEventArgs)(AddressOf acquiredImage_Processed)
            End Try
    End Sub
    
    Private Shared Sub acquiredImage_Processing(sender As Object, e As Vintasoft.Twain.ImageProcessing.TwainAcquiredImageProcessingEventArgs)
            System.Console.Write(e.Action.ToString() & " ")
    End Sub
    
    Private Shared Sub acquiredImage_Progress(sender As Object, e As Vintasoft.Twain.ImageProcessing.TwainAcquiredImageProcessingProgressEventArgs)
            System.Console.Write(".")
    End Sub
    
    Private Shared Sub acquiredImage_Processed(sender As Object, e As Vintasoft.Twain.ImageProcessing.TwainAcquiredImageProcessedEventArgs)
            System.Console.WriteLine(" finished")
    End Sub