namespace TwainExamples_CSharp
{
public partial class How_to_process_acquired_image : System.Windows.Forms.Form
{
/// <summary>
/// TWAIN device manager.
/// </summary>
Vintasoft.Twain.DeviceManager _deviceManager;
public How_to_process_acquired_image()
{
InitializeComponent();
// create and open device manager
_deviceManager = new Vintasoft.Twain.DeviceManager(this);
_deviceManager.Open();
}
/// <summary>
/// Acquire images asynchronously.
/// </summary>
public void AcquireImagesAsynchronously()
{
try
{
// get reference to the default device
Vintasoft.Twain.Device device = _deviceManager.DefaultDevice;
// subscribe to the device events
device.ImageAcquired += new System.EventHandler<Vintasoft.Twain.ImageAcquiredEventArgs>(device_ImageAcquired);
device.ScanCanceled += new System.EventHandler(device_ScanCanceled);
device.ScanFailed += new System.EventHandler<Vintasoft.Twain.ScanFailedEventArgs>(device_ScanFailed);
device.ScanFinished += new System.EventHandler(device_ScanFinished);
// set scanning settings
device.TransferMode = Vintasoft.Twain.TransferMode.Memory;
device.ShowUI = false;
// acquire images asynchronously
device.Acquire();
}
catch (Vintasoft.Twain.TwainException ex)
{
System.Windows.Forms.MessageBox.Show(ex.Message);
}
}
/// <summary>
/// Image is acquired.
/// </summary>
private void device_ImageAcquired(object sender, Vintasoft.Twain.ImageAcquiredEventArgs e)
{
Vintasoft.Twain.AcquiredImage acquiredImage = e.Image;
// despeckle/deskew/detect border
ProcessAcquiredImage(acquiredImage);
// add image to multipage TIFF file if image is not blank
if (!acquiredImage.IsBlank(0.01f))
acquiredImage.Save(@"d:\test.tif");
// dispose the acquired image
acquiredImage.Dispose();
}
/// <summary>
/// Scan is canceled.
/// </summary>
private void device_ScanCanceled(object sender, System.EventArgs e)
{
System.Windows.Forms.MessageBox.Show("Scan is canceled.");
}
/// <summary>
/// Scan is failed.
/// </summary>
private void device_ScanFailed(object sender, Vintasoft.Twain.ScanFailedEventArgs e)
{
System.Windows.Forms.MessageBox.Show("Scan is failed: " + e.ErrorString);
}
/// <summary>
/// Scan is finished.
/// </summary>
void device_ScanFinished(object sender, System.EventArgs e)
{
Vintasoft.Twain.Device device = (Vintasoft.Twain.Device)sender;
// unsubscribe from device events
device.ImageAcquired -= new System.EventHandler<Vintasoft.Twain.ImageAcquiredEventArgs>(device_ImageAcquired);
device.ScanCanceled -= new System.EventHandler(device_ScanCanceled);
device.ScanFailed -= new System.EventHandler<Vintasoft.Twain.ScanFailedEventArgs>(device_ScanFailed);
device.ScanFinished -= new System.EventHandler(device_ScanFinished);
// if device is not closed
if (device.State != Vintasoft.Twain.DeviceState.Closed)
// close the device
device.Close();
System.Windows.Forms.MessageBox.Show("Scan is finished.");
}
/// <summary>
/// Process the acquired image.
/// </summary>
private void ProcessAcquiredImage(Vintasoft.Twain.AcquiredImage acquiredImage)
{
System.Console.WriteLine(string.Format("Image ({0})", acquiredImage.ImageInfo));
try
{
// subscribe to the processing events
acquiredImage.Processing += new System.EventHandler<Vintasoft.Twain.ImageProcessing.AcquiredImageProcessingEventArgs>(acquiredImage_Processing);
acquiredImage.Progress += new System.EventHandler<Vintasoft.Twain.ImageProcessing.AcquiredImageProcessingProgressEventArgs>(acquiredImage_Progress);
acquiredImage.Processed += new System.EventHandler<Vintasoft.Twain.ImageProcessing.AcquiredImageProcessedEventArgs>(acquiredImage_Processed);
// despeckle image
acquiredImage.Despeckle(8, 25, 30, 400);
// deskew image
acquiredImage.Deskew(Vintasoft.Twain.BorderColor.AutoDetect, 1, 1);
// detect border of image
acquiredImage.DetectBorder(5);
}
catch (Vintasoft.Twain.ImagingException ex)
{
System.Console.WriteLine("Error: " + ex.Message);
}
finally
{
// unsubscribe from the processing events
acquiredImage.Processing -= new System.EventHandler<Vintasoft.Twain.ImageProcessing.AcquiredImageProcessingEventArgs>(acquiredImage_Processing);
acquiredImage.Progress -= new System.EventHandler<Vintasoft.Twain.ImageProcessing.AcquiredImageProcessingProgressEventArgs>(acquiredImage_Progress);
acquiredImage.Processed -= new System.EventHandler<Vintasoft.Twain.ImageProcessing.AcquiredImageProcessedEventArgs>(acquiredImage_Processed);
}
}
/// <summary>
/// Image processing is started.
/// </summary>
private void acquiredImage_Processing(object sender, Vintasoft.Twain.ImageProcessing.AcquiredImageProcessingEventArgs e)
{
System.Console.Write(e.Action.ToString() + " ");
}
/// <summary>
/// Image processing is in progress.
/// </summary>
private void acquiredImage_Progress(object sender, Vintasoft.Twain.ImageProcessing.AcquiredImageProcessingProgressEventArgs e)
{
System.Console.Write(".");
}
/// <summary>
/// Image processing is finished.
/// </summary>
private void acquiredImage_Processed(object sender, Vintasoft.Twain.ImageProcessing.AcquiredImageProcessedEventArgs e)
{
System.Console.WriteLine(" finished");
}
}
}
Partial Public Class How_to_process_acquired_image
Inherits Form
''' <summary>
''' TWAIN device manager.
''' </summary>
Private _deviceManager As Vintasoft.Twain.DeviceManager
Public Sub New()
InitializeComponent()
' create and open device manager
_deviceManager = New Vintasoft.Twain.DeviceManager(Me)
_deviceManager.Open()
End Sub
''' <summary>
''' Acquire images asynchronously.
''' </summary>
Public Sub AcquireImagesAsynchronously()
Try
' get reference to the default device
Dim device1 As Vintasoft.Twain.Device = _deviceManager.DefaultDevice
' subscribe to the device events
AddHandler device1.ImageAcquired, New EventHandler(Of Vintasoft.Twain.ImageAcquiredEventArgs)(AddressOf device_ImageAcquired)
AddHandler device1.ScanCanceled, New EventHandler(AddressOf device_ScanCanceled)
AddHandler device1.ScanFailed, New EventHandler(Of Vintasoft.Twain.ScanFailedEventArgs)(AddressOf device_ScanFailed)
AddHandler device1.ScanFinished, New EventHandler(AddressOf device_ScanFinished)
' set scanning settings
device1.TransferMode = Vintasoft.Twain.TransferMode.Memory
device1.ShowUI = False
' acquire images asynchronously
device1.Acquire()
Catch ex As Vintasoft.Twain.TwainException
MessageBox.Show(ex.Message)
End Try
End Sub
''' <summary>
''' Image is acquired.
''' </summary>
Private Sub device_ImageAcquired(ByVal sender As Object, ByVal e As Vintasoft.Twain.ImageAcquiredEventArgs)
Dim acquiredImage As Vintasoft.Twain.AcquiredImage = e.Image
' 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("d:\test.tif")
End If
' dispose the acquired image
acquiredImage.Dispose()
End Sub
''' <summary>
''' Scan is canceled.
''' </summary>
Private Sub device_ScanCanceled(ByVal sender As Object, ByVal e As EventArgs)
MessageBox.Show("Scan is canceled.")
End Sub
''' <summary>
''' Scan is failed.
''' </summary>
Private Sub device_ScanFailed(ByVal sender As Object, ByVal e As Vintasoft.Twain.ScanFailedEventArgs)
MessageBox.Show("Scan is failed: " + Convert.ToString(e.ErrorString))
End Sub
''' <summary>
''' Scan is finished.
''' </summary>
Private Sub device_ScanFinished(ByVal sender As Object, ByVal e As EventArgs)
Dim device1 As Vintasoft.Twain.Device = DirectCast(sender, Vintasoft.Twain.Device)
' unsubscribe from device events
RemoveHandler device1.ImageAcquired, New EventHandler(Of Vintasoft.Twain.ImageAcquiredEventArgs)(AddressOf device_ImageAcquired)
RemoveHandler device1.ScanCanceled, New EventHandler(AddressOf device_ScanCanceled)
RemoveHandler device1.ScanFailed, New EventHandler(Of Vintasoft.Twain.ScanFailedEventArgs)(AddressOf device_ScanFailed)
RemoveHandler device1.ScanFinished, New EventHandler(AddressOf device_ScanFinished)
' if device is not closed
If device1.State <> Vintasoft.Twain.DeviceState.Closed Then
' close the device
device1.Close()
End If
MessageBox.Show("Scan is finished.")
End Sub
''' <summary>
''' Process the acquired image.
''' </summary>
Private Sub ProcessAcquiredImage(ByVal acquiredImage As Vintasoft.Twain.AcquiredImage)
Console.WriteLine(String.Format("Image ({0})", acquiredImage.ImageInfo))
Try
' subscribe to the processing events
AddHandler acquiredImage.Processing, New EventHandler(Of Vintasoft.Twain.ImageProcessing.AcquiredImageProcessingEventArgs)(AddressOf acquiredImage_Processing)
AddHandler acquiredImage.Progress, New EventHandler(Of Vintasoft.Twain.ImageProcessing.AcquiredImageProcessingProgressEventArgs)(AddressOf acquiredImage_Progress)
AddHandler acquiredImage.Processed, New EventHandler(Of Vintasoft.Twain.ImageProcessing.AcquiredImageProcessedEventArgs)(AddressOf acquiredImage_Processed)
' despeckle image
acquiredImage.Despeckle(8, 25, 30, 400)
' deskew image
acquiredImage.Deskew(Vintasoft.Twain.BorderColor.AutoDetect, 5, 5)
' detect border of image
acquiredImage.DetectBorder(5)
Catch ex As Vintasoft.Twain.ImagingException
Console.WriteLine("Error: " + ex.Message)
Finally
' unsubscribe from the processing events
RemoveHandler acquiredImage.Processing, New EventHandler(Of Vintasoft.Twain.ImageProcessing.AcquiredImageProcessingEventArgs)(AddressOf acquiredImage_Processing)
RemoveHandler acquiredImage.Progress, New EventHandler(Of Vintasoft.Twain.ImageProcessing.AcquiredImageProcessingProgressEventArgs)(AddressOf acquiredImage_Progress)
RemoveHandler acquiredImage.Processed, New EventHandler(Of Vintasoft.Twain.ImageProcessing.AcquiredImageProcessedEventArgs)(AddressOf acquiredImage_Processed)
End Try
End Sub
''' <summary>
''' Image processing is started.
''' </summary>
Private Sub acquiredImage_Processing(ByVal sender As Object, ByVal e As Vintasoft.Twain.ImageProcessing.AcquiredImageProcessingEventArgs)
Console.Write(e.Action.ToString() + " ")
End Sub
''' <summary>
''' Image processing is in progress.
''' </summary>
Private Sub acquiredImage_Progress(ByVal sender As Object, ByVal e As Vintasoft.Twain.ImageProcessing.AcquiredImageProcessingProgressEventArgs)
Console.Write(".")
End Sub
''' <summary>
''' Image processing is finished.
''' </summary>
Private Sub acquiredImage_Processed(ByVal sender As Object, ByVal e As Vintasoft.Twain.ImageProcessing.AcquiredImageProcessedEventArgs)
Console.WriteLine(" finished")
End Sub
End Class