1003826: Added content for OCR under Features section

Document-Processing/PDF/PDF-Library/NET/Working-with-DigitalSignature.md

@@ -688,36 +688,36 @@ loadedDocument.Close(true);
 
 {% highlight c# tabtitle="C# [Windows-specific]" %}
 
-    using Syncfusion.Pdf.Parsing;
+using Syncfusion.Pdf.Parsing;
 
-    // Load the PDF document
-    PdfLoadedDocument loadedDocument = new PdfLoadedDocument("Input.pdf");
+// Load the PDF document
+PdfLoadedDocument loadedDocument = new PdfLoadedDocument("Input.pdf");
 
-    // Check if the document contains a form with fields
-    if (loadedDocument.Form == null || loadedDocument.Form.Fields.Count == 0)
-    {
-        Console.WriteLine("No signature fields found in the document.");
-    }
-    else
+// Check if the document contains a form with fields
+if (loadedDocument.Form == null || loadedDocument.Form.Fields.Count == 0)
+{
+    Console.WriteLine("No signature fields found in the document.");
+}
+else
+{
+    // Iterate through all fields in the form
+    foreach (PdfLoadedField field in loadedDocument.Form.Fields)
     {
-        // Iterate through all fields in the form
-        foreach (PdfLoadedField field in loadedDocument.Form.Fields)
+        // Check if the field is a signature field
+        PdfLoadedSignatureField signatureField = field as PdfLoadedSignatureField;
+        if (signatureField != null)
         {
-            // Check if the field is a signature field
-            PdfLoadedSignatureField signatureField = field as PdfLoadedSignatureField;
-            if (signatureField != null)
-            {
-                // Determine whether the signature field is signed or not
-                string status = signatureField.IsSigned ? "Signed" : "UnSigned";
+            // Determine whether the signature field is signed or not
+            string status = signatureField.IsSigned ? "Signed" : "UnSigned";
 
-                // Output the result for each signature field
-                Console.WriteLine("Signature Field " + signatureField.Name + " is: " + status);
-            }
+            // Output the result for each signature field
+            Console.WriteLine("Signature Field " + signatureField.Name + " is: " + status);
         }
     }
+}   
 
-    // Close the document
-    loadedDocument.Close(true);
+// Close the document
+loadedDocument.Close(true);
 
 {% endhighlight %}
 

Document-Processing/PDF/PDF-Library/NET/Working-with-OCR/Features.md

@@ -1303,7 +1303,7 @@ End Using
 
 ## Black List
 
-The [BlackList](https://help.syncfusion.com/cr/document-processing/Syncfusion.OCRProcessor.OCRSettings.html#Syncfusion_OCRProcessor_OCRSettings_BlackList) property specifies the characters that exclude from the character set used for recognition and the OCR will not return any of the characters you are specified in the list. For more information, refer to the following code sample.
+The BlackList property specifies the characters that exclude from the character set used for recognition and the OCR will not return any of the characters you are specified in the list. For more information, refer to the following code sample.
 {% tabs %}
 
 {% highlight c# tabtitle="C# [Cross-platform]" %}
@@ -1904,3 +1904,176 @@ End Using
 {% endtabs %}
 
 You can downloaded a complete working sample from [GitHub](https://github.com/SyncfusionExamples/PDF-Examples/tree/master/OCR/.NET/Adding-Line-Breaks-Using-OCR/.NET).
+
+## Perform OCR on Multi-frame TIFF images
+
+The below code example illustrates how to perform OCR on Multi-frame TIFF images using [PerformOCR](https://help.syncfusion.com/cr/document-processing/Syncfusion.OCRProcessor.OCRProcessor.html#Syncfusion_OCRProcessor_OCRProcessor_PerformOCR_System_Drawing_Bitmap_System_String_) method in [OCRProcessor](https://help.syncfusion.com/cr/document-processing/Syncfusion.OCRProcessor.OCRProcessor.html) class.
+
+{% tabs %} 
+
+{% highlight c# tabtitle="C# [Cross-platform]" %}
+
+using Syncfusion.OCRProcessor;
+using System.Drawing;
+using System.Drawing.Imaging;
+using System.Text;
+
+string filePath = "multipage_tiff_example.tif";
+
+StringBuilder output = new StringBuilder();
+
+using (FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read))
+using (Image img = Image.FromStream(fs, useEmbeddedColorManagement: false, validateImageData: false))
+using (OCRProcessor processor = new OCRProcessor())
+{
+    processor.TessDataPath = "TessdataBest/";
+    processor.Settings.Language = Languages.English;
+    processor.Settings.TesseractVersion = TesseractVersion.Version5_0;
+
+    // Determine how many frames/pages the TIFF contains.
+    int frameCount = img.GetFrameCount(FrameDimension.Page);
+    if (frameCount <= 1)
+    {
+        // Some TIFFs may use other dimensions; try Time/Resolution as fallback
+        frameCount = Math.Max(frameCount, img.GetFrameCount(FrameDimension.Time));
+        frameCount = Math.Max(frameCount, img.GetFrameCount(FrameDimension.Resolution));
+    }
+    if (frameCount < 1) frameCount = 1;
+
+    for (int i = 0; i < frameCount; i++)
+    {
+        // Prefer Page dimension
+        try { img.SelectActiveFrame(FrameDimension.Page, i); }
+        catch { /* fallback if needed */ }
+
+        // Clone the selected frame to a standalone Bitmap for OCR (important for some engines)
+        using (Bitmap frameBmp = new Bitmap(img.Width, img.Height))
+        using (Graphics g = Graphics.FromImage(frameBmp))
+        {
+            g.DrawImage(img, 0, 0, img.Width, img.Height);
+            MemoryStream ms = new MemoryStream();
+            frameBmp.Save(ms, ImageFormat.Png);
+            ms.Position = 0;
+            string pageText = processor.PerformOCR(ms, processor.TessDataPath);
+            output.AppendLine($"--- Page {i + 1} ---");
+            output.AppendLine(pageText ?? string.Empty);
+            output.AppendLine();
+        }
+    }
+}
+File.WriteAllText("Output.txt", output.ToString());
+
+{% endhighlight %}
+
+{% highlight c# tabtitle="C# [Windows-specific]" %}
+
+using Syncfusion.OCRProcessor;
+using System;
+using System.IO;
+using System.Text;
+using System.Drawing;
+using System.Drawing.Imaging;
+
+string filePath = "multipage_tiff_example.tif";
+
+StringBuilder output = new StringBuilder();
+
+using (FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read))
+using (Image img = Image.FromStream(fs, useEmbeddedColorManagement: false, validateImageData: false))
+using (OCRProcessor processor = new OCRProcessor())
+{
+    processor.TessDataPath = "TessdataBest/";
+    processor.Settings.Language = Languages.English;
+    processor.Settings.TesseractVersion = TesseractVersion.Version5_0;
+
+    // Determine how many frames/pages the TIFF contains.
+    int frameCount = img.GetFrameCount(FrameDimension.Page);
+    if (frameCount <= 1)
+    {
+        // Some TIFFs may use other dimensions; try Time/Resolution as fallback
+        frameCount = Math.Max(frameCount, img.GetFrameCount(FrameDimension.Time));
+        frameCount = Math.Max(frameCount, img.GetFrameCount(FrameDimension.Resolution));
+    }
+    if (frameCount < 1) frameCount = 1;
+
+    for (int i = 0; i < frameCount; i++)
+    {
+        // Prefer Page dimension
+        try { img.SelectActiveFrame(FrameDimension.Page, i); }
+        catch { /* fallback if needed */ }
+
+        // Clone the selected frame to a standalone Bitmap for OCR (important for some engines)
+        using (Bitmap frameBmp = new Bitmap(img.Width, img.Height))
+        using (Graphics g = Graphics.FromImage(frameBmp))
+        {
+            g.DrawImage(img, 0, 0, img.Width, img.Height);
+
+            string pageText = processor.PerformOCR(frameBmp, processor.TessDataPath);
+            output.AppendLine($"--- Page {i + 1} ---");
+            output.AppendLine(pageText ?? string.Empty);
+            output.AppendLine();
+        }
+    }
+}
+File.WriteAllText("Output.txt", output.ToString());
+
+{% endhighlight %}
+
+{% highlight vb.net tabtitle="VB.NET [Windows-specific]" %}
+
+Imports System.Drawing
+Imports System.Drawing.Imaging
+Imports System.IO
+Imports System.Text
+Imports Syncfusion.OCRProcessor
+Imports Syncfusion.Pdf
+
+Dim filePath As String = "multipage_tiff_example.tif"
+Dim output = New StringBuilder()
+
+Dim fs = New FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read)
+Dim img = Image.FromStream(fs, useEmbeddedColorManagement:=False, validateImageData:=False)
+
+Using processor As New OCRProcessor()
+    processor.TessDataPath = "TessdataBest\"
+    processor.Settings.Language = Languages.English
+    processor.Settings.TesseractVersion = TesseractVersion.Version5_0
+
+    ' Determine how many frames/pages the TIFF contains.
+    Dim frameCount As Integer = img.GetFrameCount(FrameDimension.Page)
+    If frameCount <= 1 Then
+        ' Some TIFFs may use other dimensions; try Time/Resolution as fallback
+        frameCount = Math.Max(frameCount, img.GetFrameCount(FrameDimension.Time))
+        frameCount = Math.Max(frameCount, img.GetFrameCount(FrameDimension.Resolution))
+    End If
+    If frameCount < 1 Then frameCount = 1
+
+    For i As Integer = 0 To frameCount - 1
+        ' Prefer Page dimension
+        Try
+            img.SelectActiveFrame(FrameDimension.Page, i)
+        Catch
+            ' fallback if needed
+        End Try
+
+        ' Clone the selected frame to a standalone Bitmap for OCR (important for some engines)
+        Using frameBmp As New Bitmap(img.Width, img.Height)
+            Using g As Graphics = Graphics.FromImage(frameBmp)
+                g.DrawImage(img, 0, 0, img.Width, img.Height)
+            End Using
+
+            Dim pageText As String = processor.PerformOCR(frameBmp, processor.TessDataPath)
+            output.AppendLine($"--- Page {i + 1} ---")
+            output.AppendLine(If(pageText, String.Empty))
+            output.AppendLine()
+        End Using
+    Next
+End Using
+
+File.WriteAllText("Output.txt", output.ToString())
+
+{% endhighlight %}
+
+{% endtabs %}  
+
+You can downloaded a complete working sample from GitHub.