• Leadtools.dll
• Leadtools.Drawing.dll
• Leadtools.Codecs.dll
• Leadtools.Controls.WinForms.dll
• Leadtools.Forms.dll
• Leadtools.Forms.DocumentWriters.dll
• Leadtools.Forms.Ocr.dll
• Leadtools.Forms.Ocr.Advantage.dll
• Leadtools.Codecs.Bmp.dll
• Leadtools.Codecs.Cmp.dll
• Leadtools.Codecs.Tif.dll
• Leadtools.Codecs.Fax.dll

[C#]

             using Leadtools;
             using Leadtools.Codecs;
             using Leadtools.Drawing;
             using Leadtools.Controls;
             using Leadtools.Forms;
             using Leadtools.Forms.Ocr;
             using Leadtools.Forms.DocumentWriters;
             

[Visual Basic]

             Imports Leadtools
             Imports Leadtools.Codecs
             Imports Leadtools.Drawing
             Imports Leadtools.Controls
             Imports Leadtools.Forms
             Imports Leadtools.Forms.Ocr
             Imports Leadtools.Forms.DocumentWriters
             

[C#]

             // Image viewer instance
             private ImageViewer _imageViewer;
             // The OCR engine instance
             private IOcrEngine _ocrEngine;
             // The OCR page
             private IOcrPage _ocrPage;
             // Recognition results (characters with bounds information)
             private IOcrZoneCharacters _zoneCharacters;
             

[Visual Basic]

             ' Image viewer instance
             Private _imageViewer As ImageViewer
             ' The OCR engine instance
             Private _ocrEngine As IOcrEngine
             ' The OCR page
             Private _ocrPage As IOcrPage
             ' Recognition results (characters with bounds information)
             Private _zoneCharacters As IOcrZoneCharacters
             

[C#]

             protected override void OnLoad(EventArgs e)
             {
                // Add the image viewer to the form
                _imageViewer = new ImageViewer();
                _imageViewer.Dock = DockStyle.Fill;
                Controls.Add(_imageViewer);
                _imageViewer.BringToFront();
                // Show images using their true size
                _imageViewer.UseDpi = true;
            
                // Add ability to pan/zoom using the left mouse button
                ImageViewerPanZoomInteractiveMode panZoomMode = new ImageViewerPanZoomInteractiveMode();
                panZoomMode.MouseButtons = MouseButtons.Left;
                _imageViewer.InteractiveModes.Add(panZoomMode);
                // Add a rubber band mode to the right mouse button
                ImageViewerRubberBandInteractiveMode rubbBandMode = new ImageViewerRubberBandInteractiveMode();
                rubbBandMode.MouseButtons = MouseButtons.Right;
                // Hook to the rubber-band completed event so we can recognize that area
                rubbBandMode.RubberBandCompleted += rubbBandMode_RubberBandCompleted;
                _imageViewer.InteractiveModes.Add(rubbBandMode);
            
                // Initialize the OCR engine
                _ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.Advantage, false);
                // Startup the engine
                _ocrEngine.Startup(null, null, null, @"C:\LEADTOOLS 19\Bin\Common\OcrAdvantageRuntime");
                // Create the OCR page from an image
                string fileName = @"C:\Users\Public\Documents\LEADTOOLS Images\Ocr1.tif";
                RasterImage rasterImage = _ocrEngine.RasterCodecsInstance.Load(fileName, 1);
                _ocrPage = _ocrEngine.CreatePage(rasterImage, OcrImageSharingMode.AutoDispose);
                // Show this image in the viewer
                _imageViewer.Image = _ocrPage.GetRasterImage();
                Text = "Left click and drag to pan, CTRL-Left and drag click to zoom, right click and draw to draw the selection rectangle";
            
                // Hook to the post render event of the viewer so we can render the recognition result on the page
                _imageViewer.PostRender += _imageViewer_PostRender;
            
                base.OnLoad(e);
             }
             

[Visual Basic]

             Protected Overrides Sub OnLoad(e As EventArgs)
                ' Add the image viewer to the form
                _imageViewer = New ImageViewer()
                _imageViewer.Dock = DockStyle.Fill
                Controls.Add(_imageViewer)
                _imageViewer.BringToFront()
                ' Show images using their true size
                _imageViewer.UseDpi = True
             
                ' Add ability to pan/zoom using the left mouse button
                Dim panZoomMode As New ImageViewerPanZoomInteractiveMode()
                panZoomMode.MouseButtons = MouseButtons.Left
                _imageViewer.InteractiveModes.Add(panZoomMode)
                ' Add a rubber band mode to the right mouse button
                Dim rubbBandMode As New ImageViewerRubberBandInteractiveMode()
                rubbBandMode.MouseButtons = MouseButtons.Right
                ' Hook to the rubber-band completed event so we can recognize that area
                AddHandler rubbBandMode.RubberBandCompleted, AddressOf rubbBandMode_RubberBandCompleted
                _imageViewer.InteractiveModes.Add(rubbBandMode)
             
                ' Initialize the OCR engine
                _ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.Advantage, False)
                ' Startup the engine
                _ocrEngine.Startup(Nothing, Nothing, Nothing, "C:\LEADTOOLS 19\Bin\Common\OcrAdvantageRuntime")
                ' Create the OCR page from an image
                Dim fileName As String = "C:\Users\Public\Documents\LEADTOOLS Images\Ocr1.tif"
                Dim rasterImage As RasterImage = _ocrEngine.RasterCodecsInstance.Load(fileName, 1)
                _ocrPage = _ocrEngine.CreatePage(rasterImage, OcrImageSharingMode.AutoDispose)
                ' Show this image in the viewer
                _imageViewer.Image = _ocrPage.GetRasterImage()
                Text = "Left click and drag to pan, CTRL-Left and drag click to zoom, right click and draw to draw the selection rectangle"
             
                ' Hook to the post render event of the viewer so we can render the recognition result on the page
                AddHandler _imageViewer.PostRender, AddressOf _imageViewer_PostRender
             
                MyBase.OnLoad(e)
             End Sub
             

[C#]

             protected override void OnFormClosed(FormClosedEventArgs e)
             {
                // Destroy the page
                _ocrPage.Dispose();
               
                // And the engine
                _ocrEngine.Dispose();
               
                base.OnFormClosed(e);
             }
             

[Visual Basic]

             Protected Overrides Sub OnFormClosed(e As FormClosedEventArgs)
                ' Destroy the page
                _ocrPage.Dispose()
            
                ' And the engine
                _ocrEngine.Dispose()
            
                MyBase.OnFormClosed(e)
             End Sub
             

[C#]

             private void rubbBandMode_RubberBandCompleted(object sender, ImageViewerRubberBandEventArgs e)
             {
                // Use has drawn a selection rectangle
            
                // Remove current zone from the page
                _ocrPage.Zones.Clear();
            
                // Add the new zone. The points from rubber band is in control coordinates, need to convert them to image
                LeadRect bounds = LeadRect.FromLTRB(e.Points[0].X, e.Points[0].Y, e.Points[1].X, e.Points[1].Y);
                bounds = _imageViewer.ConvertRect(null, ImageViewerCoordinateType.Control, ImageViewerCoordinateType.Image, bounds);
            
                // Add a new text zone from these coordinates
                OcrZone ocrZone = new OcrZone();
                ocrZone.ZoneType = OcrZoneType.Text;
                ocrZone.Bounds = new LogicalRectangle(bounds);
                _ocrPage.Zones.Add(ocrZone);
            
                // Recognize the page to get the text of the zone
                _ocrPage.Recognize(null);
            
                // Get the recognized characters
                IOcrPageCharacters pageCharacters = _ocrPage.GetRecognizedCharacters();
                _zoneCharacters = pageCharacters[0];
            
                // Refresh the viewer so we render the character bounds and positions
                _imageViewer.Refresh();
            
                // Show the result in a message box
                string text = _ocrPage.GetText(0);
                if (string.IsNullOrEmpty(text))
                   text = "[Nothing found]";
                MessageBox.Show(this, text);
             }
             

[Visual Basic]

             Private Sub rubbBandMode_RubberBandCompleted(sender As Object, e As ImageViewerRubberBandEventArgs)
                ' Use has drawn a selection rectangle
            
                ' Remove the current zone from the page
                _ocrPage.Zones.Clear()
            
                ' Add the new zone. The points from rubber band is in control coordinates, need to convert them to image
                Dim bounds As LeadRect = LeadRect.FromLTRB(e.Points(0).X, e.Points(0).Y, e.Points(1).X, e.Points(1).Y)
                bounds = _imageViewer.ConvertRect(Nothing, ImageViewerCoordinateType.Control, ImageViewerCoordinateType.Image, bounds)
            
                ' Add a new text zone from these coordinates
                Dim ocrZone As New OcrZone()
                ocrZone.ZoneType = OcrZoneType.Text
                ocrZone.Bounds = New LogicalRectangle(bounds)
                _ocrPage.Zones.Add(ocrZone)
            
                ' Recognize the page to get the text of the zone
                _ocrPage.Recognize(Nothing)
            
                ' Get the recognized characters
                Dim pageCharacters As IOcrPageCharacters = _ocrPage.GetRecognizedCharacters()
                _zoneCharacters = pageCharacters(0)
            
                ' Refresh the viewer so we render the character bounds and positions
                _imageViewer.Refresh()
            
                ' Show the result in a message box
                Dim text As String = _ocrPage.GetText(0)
                If String.IsNullOrEmpty(text) Then
                   text = "[Nothing found]"
                End If
                MessageBox.Show(Me, text)
             End Sub
             

[C#]

             private void _imageViewer_PostRender(object sender, ImageViewerRenderEventArgs e)
             {
                // Draw the recognition results (if we have any)
                if (_zoneCharacters == null)
                   return;
            
                Graphics graphics = e.PaintEventArgs.Graphics;
            
                using (Brush characterBrush = new SolidBrush(Color.FromArgb(128, Color.Black)))
                {
                   foreach (OcrCharacter character in _zoneCharacters)
                   {
                      // Get the character boundary
                      LogicalRectangle characterBounds = character.Bounds;
                      // The character bounds is a logical rectangle, it may be in units other than pixels. Convert to pixels
                      LeadRect bounds = characterBounds.ToRectangle(_ocrPage.DpiX, _ocrPage.DpiY);
                      // Convert the bound to what we see in the viewer
                      // Note that this demo does not have rotation; otherwise, you need to use the four corner points
                      bounds = _imageViewer.ConvertRect(null, ImageViewerCoordinateType.Image, ImageViewerCoordinateType.Control, bounds);
            
                      // Highlight the character area on the page
                      graphics.FillRectangle(characterBrush, bounds.X, bounds.Y, bounds.Width, bounds.Height);
                      graphics.DrawRectangle(Pens.Black, bounds.X, bounds.Y, bounds.Width - 1, bounds.Height - 1);
            
                      // Finally draw the character code it self
                      graphics.DrawString(new string(new char[] { character.Code }), this.Font, Brushes.White, bounds.X, bounds.Y);
                   }
                }
             }
             

[Visual Basic]

             Private Sub _imageViewer_PostRender(sender As Object, e As ImageViewerRenderEventArgs)
                ' Draw the recognition results (if we have any)
                If IsNothing(_zoneCharacters) Then Return
            
                Dim graphics As Graphics = e.PaintEventArgs.Graphics
            
                Using characterBrush As New SolidBrush(Color.FromArgb(128, Color.Black))
                   For Each character As OcrCharacter In _zoneCharacters
                      ' Get the character boundary
                      Dim characterBounds As LogicalRectangle = character.Bounds
                      ' The character bounds is a logical rectangle, it may be in units other than pixels. Convert to pixels
                      Dim bounds As LeadRect = characterBounds.ToRectangle(_ocrPage.DpiX, _ocrPage.DpiY)
                      ' Convert the bound to what we see in the viewer
                      ' Note that this demo does not have rotation; otherwise, you need to use the four corner points
                      bounds = _imageViewer.ConvertRect(Nothing, ImageViewerCoordinateType.Image, ImageViewerCoordinateType.Control, bounds)
            
                      ' Highlight the character area on the page
                      graphics.FillRectangle(characterBrush, bounds.X, bounds.Y, bounds.Width, bounds.Height)
                      graphics.DrawRectangle(Pens.Black, bounds.X, bounds.Y, bounds.Width - 1, bounds.Height - 1)
            
                      ' Finally draw the character code it self
                      graphics.DrawString(New String(New Char() {character.Code}), Me.Font, Brushes.White, bounds.X, bounds.Y)
                   Next
                End Using
             End Sub