''' <summary>
''' Acquires images from SANE device and processes images.
''' </summary>
Public Sub AcquireImagesFromSaneDeviceAndProcessImages()
    ' create SANE device manager
    Using deviceManager As New Vintasoft.Sane.SaneLocalDeviceManager()
        ' open SANE device manager
        deviceManager.Open()

        ' get count of SANE devices
        Dim deviceCount As Integer = deviceManager.Devices.Count
        If deviceCount = 0 Then
            System.Console.WriteLine("Devices are not found.")
            Return
        End If

        ' select the first SANE device
        Dim device As Vintasoft.Sane.SaneLocalDevice = deviceManager.Devices(0)

        ' open SANE device
        device.Open()

        Dim acquiredImage As Vintasoft.Sane.SaneAcquiredImage
        Do
            Try
                ' acquire image from SANE device
                acquiredImage = device.AcquireImageSync()
                ' if image is received
                If acquiredImage IsNot Nothing Then
                    System.Console.WriteLine("Image is acquired.")

                    ' process acquired image
                    ProcessSaneAcquiredImage(acquiredImage)
                Else
                    ' if image is not received
                    System.Console.WriteLine("Scan is completed.")
                    Exit Try
                End If
            Catch ex As System.Exception
                System.Console.WriteLine(String.Format("Scan is failed: {0}", ex.Message))
                Exit Try
            End Try
            ' while device has more images to scan
        Loop While device.HasMoreImagesToScan

        ' close SANE device
        device.Close()

        ' close SANE device manager
        deviceManager.Close()
    End Using

    System.Console.ReadLine()
End Sub

''' <summary>
''' Processes image, which is acquired from SANE device.
''' </summary>
Private Sub ProcessSaneAcquiredImage(acquiredImage As Vintasoft.Sane.SaneAcquiredImage)
    Try
        ' subscribe to the processing events
        AddHandler acquiredImage.Processing, New System.EventHandler(Of Vintasoft.Sane.ImageProcessing.SaneAcquiredImageProcessingEventArgs)(AddressOf acquiredImage_Processing)
        AddHandler acquiredImage.Progress, New System.EventHandler(Of Vintasoft.Sane.ImageProcessing.SaneAcquiredImageProcessingProgressEventArgs)(AddressOf acquiredImage_Progress)
        AddHandler acquiredImage.Processed, New System.EventHandler(Of Vintasoft.Sane.ImageProcessing.SaneAcquiredImageProcessedEventArgs)(AddressOf acquiredImage_Processed)

        ' despeckle image
        acquiredImage.Despeckle(8, 25, 30, 400)
        ' deskew image
        acquiredImage.Deskew(Vintasoft.Sane.ImageProcessing.SaneBorderColor.AutoDetect, 1, 1)
        ' detect border of image
        acquiredImage.DetectBorder(5)
    Catch ex As System.Exception
        System.Console.WriteLine("Error: " & ex.Message)
    Finally
        ' unsubscribe from the processing events
        RemoveHandler acquiredImage.Processing, New System.EventHandler(Of Vintasoft.Sane.ImageProcessing.SaneAcquiredImageProcessingEventArgs)(AddressOf acquiredImage_Processing)
        RemoveHandler acquiredImage.Progress, New System.EventHandler(Of Vintasoft.Sane.ImageProcessing.SaneAcquiredImageProcessingProgressEventArgs)(AddressOf acquiredImage_Progress)
        RemoveHandler acquiredImage.Processed, New System.EventHandler(Of Vintasoft.Sane.ImageProcessing.SaneAcquiredImageProcessedEventArgs)(AddressOf acquiredImage_Processed)
    End Try
End Sub

''' <summary>
''' Image processing is started.
''' </summary>
Private Sub acquiredImage_Processing(sender As Object, e As Vintasoft.Sane.ImageProcessing.SaneAcquiredImageProcessingEventArgs)
    System.Console.Write(e.Action.ToString() & " ")
End Sub

''' <summary>
''' Image processing is in progress.
''' </summary>
Private Sub acquiredImage_Progress(sender As Object, e As Vintasoft.Sane.ImageProcessing.SaneAcquiredImageProcessingProgressEventArgs)
    System.Console.Write(".")
End Sub

''' <summary>
''' Image processing is finished.
''' </summary>
Private Sub acquiredImage_Processed(sender As Object, e As Vintasoft.Sane.ImageProcessing.SaneAcquiredImageProcessedEventArgs)
    System.Console.WriteLine(" finished")
End Sub

/// <summary>
/// Acquires images from SANE device and processes images.
/// </summary>
public void AcquireImagesFromSaneDeviceAndProcessImages()
{
    // create SANE device manager
    using (Vintasoft.Sane.SaneLocalDeviceManager deviceManager = new Vintasoft.Sane.SaneLocalDeviceManager())
    {
        // open SANE device manager
        deviceManager.Open();

        // get count of SANE devices
        int deviceCount = deviceManager.Devices.Count;
        if (deviceCount == 0)
        {
            System.Console.WriteLine("Devices are not found.");
            return;
        }

        // select the first SANE device
        Vintasoft.Sane.SaneLocalDevice device = deviceManager.Devices[0];

        // open SANE device
        device.Open();

        Vintasoft.Sane.SaneAcquiredImage acquiredImage;
        do
        {
            try
            {
                // acquire image from SANE device
                acquiredImage = device.AcquireImageSync();
                // if image is received
                if (acquiredImage != null)
                {
                    System.Console.WriteLine("Image is acquired.");

                    // process acquired image
                    ProcessSaneAcquiredImage(acquiredImage);
                }
                // if image is not received
                else
                {
                    System.Console.WriteLine("Scan is completed.");
                    break;
                }
            }
            catch (System.Exception ex)
            {
                System.Console.WriteLine(string.Format("Scan is failed: {0}", ex.Message));
                break;
            }
        }
        // while device has more images to scan
        while (device.HasMoreImagesToScan);

        // close SANE device
        device.Close();

        // close SANE device manager
        deviceManager.Close();
    }

    System.Console.ReadLine();
}

/// <summary>
/// Processes image, which is acquired from SANE device.
/// </summary>
private void ProcessSaneAcquiredImage(Vintasoft.Sane.SaneAcquiredImage acquiredImage)
{
    try
    {
        // subscribe to the processing events
        acquiredImage.Processing += new System.EventHandler<Vintasoft.Sane.ImageProcessing.SaneAcquiredImageProcessingEventArgs>(acquiredImage_Processing);
        acquiredImage.Progress += new System.EventHandler<Vintasoft.Sane.ImageProcessing.SaneAcquiredImageProcessingProgressEventArgs>(acquiredImage_Progress);
        acquiredImage.Processed += new System.EventHandler<Vintasoft.Sane.ImageProcessing.SaneAcquiredImageProcessedEventArgs>(acquiredImage_Processed);

        // despeckle image
        acquiredImage.Despeckle(8, 25, 30, 400);
        // deskew image
        acquiredImage.Deskew(Vintasoft.Sane.ImageProcessing.SaneBorderColor.AutoDetect, 1, 1);
        // detect border of image
        acquiredImage.DetectBorder(5);
    }
    catch (System.Exception ex)
    {
        System.Console.WriteLine("Error: " + ex.Message);
    }
    finally
    {
        // unsubscribe from the processing events
        acquiredImage.Processing -= new System.EventHandler<Vintasoft.Sane.ImageProcessing.SaneAcquiredImageProcessingEventArgs>(acquiredImage_Processing);
        acquiredImage.Progress -= new System.EventHandler<Vintasoft.Sane.ImageProcessing.SaneAcquiredImageProcessingProgressEventArgs>(acquiredImage_Progress);
        acquiredImage.Processed -= new System.EventHandler<Vintasoft.Sane.ImageProcessing.SaneAcquiredImageProcessedEventArgs>(acquiredImage_Processed);
    }
}

/// <summary>
/// Image processing is started.
/// </summary>
private void acquiredImage_Processing(object sender, Vintasoft.Sane.ImageProcessing.SaneAcquiredImageProcessingEventArgs e)
{
    System.Console.Write(e.Action.ToString() + " ");
}

/// <summary>
/// Image processing is in progress.
/// </summary>
private void acquiredImage_Progress(object sender, Vintasoft.Sane.ImageProcessing.SaneAcquiredImageProcessingProgressEventArgs e)
{
    System.Console.Write(".");
}

/// <summary>
/// Image processing is finished.
/// </summary>
private void acquiredImage_Processed(object sender, Vintasoft.Sane.ImageProcessing.SaneAcquiredImageProcessedEventArgs e)
{
    System.Console.WriteLine(" finished");
}