''' <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");
}