AutoTextOrientationCommand Class

In This Topic

Automatically detects text orientation in a document image and rotates the image if necessary.

Object Model

Syntax

Visual Basic
C#
Managed Extensions for C++
C++/CLI

'Declaration

Public Class AutoTextOrientationCommand
   Inherits Vintasoft.Imaging.ImageProcessing.ProcessingCommandBase

public class AutoTextOrientationCommand : Vintasoft.Imaging.ImageProcessing.ProcessingCommandBase

public __gc class AutoTextOrientationCommand : public Vintasoft.Imaging.ImageProcessing.ProcessingCommandBase*

public ref class AutoTextOrientationCommand : public Vintasoft.Imaging.ImageProcessing.ProcessingCommandBase^

Remarks

This processing command is designed to determine orientation of images containing mostly text in Roman alphabet which is rotated by multiple of 90 degrees (e.g., scanned documents with unknown orientation).
The command is not designed for:

non-textual images
non-Roman text
Roman text with only capital letters
rotated text with rotation angle other than multiple of 90 degrees (use DeskewCommand )
images with only few words, insufficient for making a conclusion.

Use DeskewCommand prior to this command to align rotated image. Use other processing commands prior to this command to improve detection quality of noisy image.

Example

This C#/VB.NET code shows how to load an image from disk, automatically correct the text orientation and save the result to the new image file.

VB.NET


''' <summary>
''' Applies auto text orientation and saves the result to the specified file.
''' </summary>
''' <param name="sourceFile">Source file.</param>
''' <param name="resultFile">Result file.</param>
Public Sub ApplyAutoTextOrientation(sourceFile As String, resultFile As String)
    Using image As New Vintasoft.Imaging.VintasoftImage(sourceFile)
        ' create deskew command
        Dim deskew As New Vintasoft.Imaging.ImageProcessing.Document.DeskewCommand()

        ' create auto text orientation command
        Dim autoTextOrientation As New Vintasoft.Imaging.ImageProcessing.Document.AutoTextOrientationCommand()

        Try
            ' apply deskew command
            deskew.ExecuteInPlace(image)

            ' apply auto text orientation command
            autoTextOrientation.ExecuteInPlace(image)
        Catch ex As Vintasoft.Imaging.ImageProcessing.ImageProcessingException
            ' show error message if problem occured
            System.Windows.Forms.MessageBox.Show(ex.Message)
            Return
        End Try

        ' save the result image to file
        image.Save(resultFile)
    End Using
End Sub


/// <summary>
/// Applies auto text orientation and saves the result to the specified file.
/// </summary>
/// <param name="sourceFile">Source file.</param>
/// <param name="resultFile">Result file.</param>
public void ApplyAutoTextOrientation(string sourceFile, string resultFile)
{
    using (Vintasoft.Imaging.VintasoftImage image =
        new Vintasoft.Imaging.VintasoftImage(sourceFile))
    {
        // create deskew command
        Vintasoft.Imaging.ImageProcessing.Document.DeskewCommand deskew =
            new Vintasoft.Imaging.ImageProcessing.Document.DeskewCommand();

        // create auto text orientation command
        Vintasoft.Imaging.ImageProcessing.Document.AutoTextOrientationCommand autoTextOrientation =
            new Vintasoft.Imaging.ImageProcessing.Document.AutoTextOrientationCommand();

        try
        {
            // apply deskew command
            deskew.ExecuteInPlace(image);

            // apply auto text orientation command
            autoTextOrientation.ExecuteInPlace(image);
        }
        catch (Vintasoft.Imaging.ImageProcessing.ImageProcessingException ex)
        {
            // show error message if problem occured
            System.Windows.Forms.MessageBox.Show(ex.Message);
            return;
        }

        // save the result image to file
        image.Save(resultFile);
    }
}

Inheritance Hierarchy

System.Object
Vintasoft.Imaging.ImageProcessing.ProcessingCommandBase
Vintasoft.Imaging.ImageProcessing.Document.AutoTextOrientationCommand

Requirements

Target Platforms: .NET 7; .NET 6; .NET 5; .NET Core 3.1; .NET Framework 4.8, 4.7, 4.6, 4.5, 4.0, 3.5

Reference

AutoTextOrientationCommand Members
Vintasoft.Imaging.ImageProcessing.Document Namespace

GetTextOrientationCommand

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