How to use the Dual Stream feature of Kodak scanner?

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VintaSoft TWAIN .NET SDK allows to use the Dual Stream feature of Kodak scanners.

Dual Stream feature means that scanner has some "cameras" and can make some snapshots of each acquired page. Each camera has predefined settings (pixel type and page side) and customizable settings (resolution, brightness, contrast, threshold, filters, etc).

For example, most of Kodak scanners has 6 cameras:

/Camera_Color_Top - camera acquires only the top side of page as color image
/Camera_Color_Bottom - camera acquires only the bottom side of page as color image
/Camera_Color_Both - camera acquires the top and bottom side of page as color images
/Camera_Bitonal_Top - camera acquires only the top side of page as black-white image
/Camera_Bitonal_Bottom - camera acquires only the bottom side of page as black-white image
/Camera_Bitonal_Both - camera acquires the top and bottom sides of page as black-white images

Here is an example that demonstrates how to acquire both sides of page as black-white and color images with different resolutions:

/// <summary>
/// Synchronously acquire images from Kodak scanner and uses Kodak dual stream feature.
/// </summary>
public void SynchronouslyAcquireImagesFromKodakScannerAndUseDualStreamFeature()
{
    try
    {
        using (Vintasoft.Twain.DeviceManager deviceManager = new Vintasoft.Twain.DeviceManager())
        {
            // open the device manager
            deviceManager.Open();

            // get reference to the default device
            Vintasoft.Twain.Device device = deviceManager.DefaultDevice;

            // set scanning settings
            device.TransferMode = Vintasoft.Twain.TransferMode.Memory;
            device.ShowUI = false;

            // open the device
            device.Open();

            // set inches as units of measure
            device.UnitOfMeasure = Vintasoft.Twain.UnitOfMeasure.Inches;
            // enable duplex
            device.DocumentFeeder.DuplexEnabled = true;

            // select color camera
            device.Cameras.SetSelectedCamera("/Camera_Color_Both");
            // set resolution for color images
            device.Resolution = new Vintasoft.Twain.Resolution(300, 300);
            // enable color camera
            device.Cameras.EnableSelectedCamera();

            // select black-white camera
            device.Cameras.SetSelectedCamera("/Camera_Bitonal_Both");
            // set resolution for black-white images
            device.Resolution = new Vintasoft.Twain.Resolution(200, 200);
            // enable black-white camera
            device.Cameras.EnableSelectedCamera();

            // synchronously acquire image(s) from TWAIN device
            Vintasoft.Twain.AcquireModalState acquireModalState;
            do
            {
                acquireModalState = device.AcquireModal();
                switch (acquireModalState)
                {
                    case Vintasoft.Twain.AcquireModalState.ImageAcquired:
                        // get info about acquired image
                        Vintasoft.Twain.ImageInfo acquiredImageInfo = device.AcquiredImage.ImageInfo;
                        // show message box with info about acquired image
                        System.Console.WriteLine(string.Format("{0} {1}", acquiredImageInfo.PixelType, acquiredImageInfo.Resolution));

                        // dispose the acquired image
                        device.AcquiredImage.Dispose();
                        break;

                    case Vintasoft.Twain.AcquireModalState.ScanCompleted:
                        // output current state
                        System.Console.WriteLine("Scan completed.");
                        break;

                    case Vintasoft.Twain.AcquireModalState.ScanCanceled:
                        // output current state
                        System.Console.WriteLine("Scan canceled.");
                        break;

                    case Vintasoft.Twain.AcquireModalState.ScanFailed:
                        // output current state
                        System.Console.WriteLine(string.Format("Scan failed: {0}", device.ErrorString));
                        break;
                }
            }
            while (acquireModalState != Vintasoft.Twain.AcquireModalState.None);

            // close the device
            device.Close();

            // close the device manager
            deviceManager.Close();
        }
    }
    catch (Vintasoft.Twain.TwainException ex)
    {
        System.Console.WriteLine("Error: " + ex.Message);
    }

    System.Console.ReadLine();
}

VB.NET

''' <summary>
''' Synchronously acquire images from Kodak scanner and uses Kodak dual stream feature.
''' </summary>
Public Sub SynchronouslyAcquireImagesFromKodakScannerAndUseDualStreamFeature()
    Try
        Using deviceManager As New Vintasoft.Twain.DeviceManager()
            ' open the device manager
            deviceManager.Open()

            ' get reference to the default device
            Dim device As Vintasoft.Twain.Device = deviceManager.DefaultDevice

            ' set scanning settings
            device.TransferMode = Vintasoft.Twain.TransferMode.Memory
            device.ShowUI = False

            ' open the device
            device.Open()

            ' set inches as units of measure
            device.UnitOfMeasure = Vintasoft.Twain.UnitOfMeasure.Inches
            ' enable duplex
            device.DocumentFeeder.DuplexEnabled = True

            ' select color camera
            device.Cameras.SetSelectedCamera("/Camera_Color_Both")
            ' set resolution for color images
            device.Resolution = New Vintasoft.Twain.Resolution(300, 300)
            ' enable color camera
            device.Cameras.EnableSelectedCamera()

            ' select black-white camera
            device.Cameras.SetSelectedCamera("/Camera_Bitonal_Both")
            ' set resolution for black-white images
            device.Resolution = New Vintasoft.Twain.Resolution(200, 200)
            ' enable black-white camera
            device.Cameras.EnableSelectedCamera()

            ' synchronously acquire image(s) from TWAIN device
            Dim acquireModalState As Vintasoft.Twain.AcquireModalState
            Do
                acquireModalState = device.AcquireModal()
                Select Case acquireModalState
                    Case Vintasoft.Twain.AcquireModalState.ImageAcquired
                        ' get info about acquired image
                        Dim acquiredImageInfo As Vintasoft.Twain.ImageInfo = device.AcquiredImage.ImageInfo
                        ' show message box with info about acquired image
                        System.Console.WriteLine(String.Format("{0} {1}", acquiredImageInfo.PixelType, acquiredImageInfo.Resolution))

                        ' dispose the acquired image
                        device.AcquiredImage.Dispose()
                        Exit Select

                    Case Vintasoft.Twain.AcquireModalState.ScanCompleted
                        ' output current state
                        System.Console.WriteLine("Scan completed.")
                        Exit Select

                    Case Vintasoft.Twain.AcquireModalState.ScanCanceled
                        ' output current state
                        System.Console.WriteLine("Scan canceled.")
                        Exit Select

                    Case Vintasoft.Twain.AcquireModalState.ScanFailed
                        ' output current state
                        System.Console.WriteLine(String.Format("Scan failed: {0}", device.ErrorString))
                        Exit Select
                End Select
            Loop While acquireModalState <> Vintasoft.Twain.AcquireModalState.None

            ' close the device
            device.Close()

            ' close the device manager
            deviceManager.Close()
        End Using
    Catch ex As Vintasoft.Twain.TwainException
        System.Console.WriteLine("Error: " + ex.Message)
    End Try

    System.Console.ReadLine()
End Sub

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