IronOCR 和 Leadtools OCR 之间的比较

1.1. LeadTools OCR Features

2.1. IronOCR features

IronOCR provides a unique set of features and functions to integrate, sign, export, read graphics and extract details from images, regardless of the technical background of users or the level of sophistication of the hardware being used.

2.1.1. Accuracy

The IronOCR SDK takes work accuracy to a whole new level for OCR libraries, thanks to its accuracy rate of 99.8% that significantly outperforms other OCR libraries.

2.1.2. Fixing Low Quality Scans and Images

The IronOCR class gives C# developers granular control. They provide OCR (images and PDF to text) capability to their developers and finely-tuned performance in each unique case.

Working with real-world instances, a perfect balance between speed and accuracy may be reached by establishing variables. Clean Background Noise, Enhance Contrast, Enhance Resolution, Language, Strategy, Rotate And Straighten, Color Space, Detect White Text On Dark Backgrounds and Input Image Type are just some of the options available.

Below are the examples of before-and-after images of low-quality scans being fixed:

Before

After

2.1.3. Languages

IronOCR provides solutions in 125+ international languages to help developers all over the world.

2.1.4. OCR Text Extraction

Iron Tesseract can read a variety of picture types and PDF files. With the traditional free Tesseract engines, this feature is not possible. If scans are of poor quality, OCR input allows you to get the relevant properties automatically repaired.

2.1.5. Image Optimization Filters

The OCRInput class gives C# programmers granular control over input. Developers then preprocess image input for speed and accuracy. This eliminates the standard method of preparing photos for OCR using Photoshop Batch Scripts or ImageMagick.

2.1.6. OCR Region of an Image

In terms of performing OCR on an image with speed and accuracy, IronOCR takes it to a whole new level. IronOCR allows its end-users to select a specific area or region in the image and perform OCR on that region. The region is known as ContentAreas or CropAreas.

2.1.7. OCRResult Class

IronOCR returns an advanced result object for each page it scans using Tesseract 3, 4, or 5. This contains location data, images, text, statistical confidence, alternative symbol choices, font names, font sizes, decoration, font weights, and a position for each of the following:

• Pages
• Paragraphs
• Lines of Text
• Words
• Individual Characters
• Barcodes

2.1.8. Multiple Languages for 1 Document

IronOCR enables developers to use more than one language for a single document. This feature is of great help for .NET service providers.

Note:

IronOCR is part of an award-winning product line. By winning this award, Iron Software demonstrates that it does indeed provide an awesome doc scanner app that provides superb recognition, as well as excellent document-related conversion and manipulation.

4.1. Using the Visual Studio NuGet Manager

You can integrate IronOCR into a C# project using the Visual Studio NuGet Package Manager.

1. Expand Tools.
2. Extend the NuGet Package Manager.
3. Click on Manage NuGet Packages for Solutions.

After this, a new window will appear in the search bar: type IronOCR.

By using this method, developers can install the IronOCR library and any language pack of the developer's choice.

4.2. Direct download from the NuGet webpage

IronOCR can be directly downloaded from the NuGet website by following these instructions:

1. Navigate to the link "https://www.nuget.org/packages/IronOcr/"
2. Select the download package option from the menu on the right-hand side.
3. Double-click the downloaded package. It will be installed automatically.
4. Next, reload the solution and start using it in the project.

4.3. Direct download from the IronOCR webpage

Developers can download the IronOCR library directly from the IronOCR website by using this link.

1. Right-click the project from the solution window.
2. Then, select the option Reference and browse the location of the downloaded reference.
3. Next, click OK to add the reference.

4.4. Using the Visual Studio Command-Line

1. In Visual Studio, go to Tools -> NuGet Package Manager -> Package Manager Console
2. Enter the following line in the package manager console tab:

   Install-Package IronOcr

   The package will now download/install in the current project and be ready to use.

5.1. Using the Visual Studio NuGet Manager

You can install LeadTools OCR in a C# project using the Visual Studio NuGet Package Manager:

1. Expand Tools.
2. Extend the NuGet Package Manager.
3. Click on Manage NuGet Packages for Solutions.

After this, a new window will appear; in the search bar type LeadTools OCR.

By following these steps, developers can install the LeadTools OCR library and any language pack of the developer's choice.

5.2. Using the NuGet Website

LeadTools OCR can be downloaded directly from the NuGet website by following these instructions:

1. Navigate to the Link "https://www.nuget.org/packages/Leadtools.Ocr/"
2. Select the download package option from the menu on the right-hand side.
3. Double-click the downloaded package. It will be installed automatically.
4. Next, reload the solution and start using it in the project.

5.3. Download from the LeadTools Website

Developers can directly download the Leadtools Document SDK from their website without any hassle. Simply go to their website and download one of the packs containing the OCR library.

6.1. The LeadTools Multi-Thread OCR

LeadTools supports running more than one instance of OCR at a time, depending upon each system's physical cores. This feature of Lead Technologies saves a lot of time for .NET developers.

// Create an instance of an OCR document from the engine
IOcrDocument ocrDocument = ocrEngineInstance.DocumentManager.CreateDocument();

// Add page, zone them, recognize them and save them to the final document
ocrDocument.Pages.AddPages(imageFileName, null);
ocrDocument.Recognize(null);
ocrDocument.Save(documentFileName, DocumentFormat.Pdf, null);

// Create an instance of an OCR document from the engine
IOcrDocument ocrDocument = ocrEngineInstance.DocumentManager.CreateDocument();

// Add page, zone them, recognize them and save them to the final document
ocrDocument.Pages.AddPages(imageFileName, null);
ocrDocument.Recognize(null);
ocrDocument.Save(documentFileName, DocumentFormat.Pdf, null);

' Create an instance of an OCR document from the engine
Dim ocrDocument As IOcrDocument = ocrEngineInstance.DocumentManager.CreateDocument()

' Add page, zone them, recognize them and save them to the final document
ocrDocument.Pages.AddPages(imageFileName, Nothing)
ocrDocument.Recognize(Nothing)
ocrDocument.Save(documentFileName, DocumentFormat.Pdf, Nothing)

6.2. The IronOCR Multi-Thread OCR

Using the multi-thread feature by IronOCR is quite easy and time-saving for developers. Iron Tesseract will automatically attempt to use all threads available on all cores, and will carefully consider responsiveness on the main/GUI thread.

using IronOcr;

var Ocr = new IronTesseract();

using (var Input = new OcrInput())
{
    Input.AddPdf("scan.pdf");

    // Image processing is automatically multithreaded
    Input.Deskew();

    // OCR reading is automatically multi-threaded too
    var Result = Ocr.Read(Input);
}

using IronOcr;

var Ocr = new IronTesseract();

using (var Input = new OcrInput())
{
    Input.AddPdf("scan.pdf");

    // Image processing is automatically multithreaded
    Input.Deskew();

    // OCR reading is automatically multi-threaded too
    var Result = Ocr.Read(Input);
}

Imports IronOcr

Private Ocr = New IronTesseract()

Using Input = New OcrInput()
	Input.AddPdf("scan.pdf")

	' Image processing is automatically multithreaded
	Input.Deskew()

	' OCR reading is automatically multi-threaded too
	Dim Result = Ocr.Read(Input)
End Using

7.1. Create Searchable PDFs with IronOCR

IronOCR's awesome doc scanner app allows developers to take the creation of searchable PDFs to a whole new level by offering support in detecting text characters in images and turning them into meaningful PDF text. The code example for users is below:

using IronOcr;

var Ocr = new IronTesseract();
using (var Input = new OcrInput())
{
    Input.Add(@"images\page1.png");
    Input.Add(@"images\page2.bmp");
    Input.Add(@"images\page3.tiff");

    Input.Deskew();

    var Result = Ocr.Read(Input);
    Result.SaveAsSearchablePdf("searchable.pdf");
}

using IronOcr;

var Ocr = new IronTesseract();
using (var Input = new OcrInput())
{
    Input.Add(@"images\page1.png");
    Input.Add(@"images\page2.bmp");
    Input.Add(@"images\page3.tiff");

    Input.Deskew();

    var Result = Ocr.Read(Input);
    Result.SaveAsSearchablePdf("searchable.pdf");
}

Imports IronOcr

Private Ocr = New IronTesseract()
Using Input = New OcrInput()
	Input.Add("images\page1.png")
	Input.Add("images\page2.bmp")
	Input.Add("images\page3.tiff")

	Input.Deskew()

	Dim Result = Ocr.Read(Input)
	Result.SaveAsSearchablePdf("searchable.pdf")
End Using

7.2. Create Searchable PDFs with LeadTools OCR

Lead Technologies offers an awesome doc scanner app from their award-winning line of software. However, for the end-user, the code is a little more complicated than that used for IronOCR.

private void saveAsSearchablePDFToolStripMenuItem_Click(object sender, EventArgs e)
{
    try
    {
        // Create a document
        using (IOcrDocument ocrDocument = _ocrEngine.DocumentManager.CreateDocument(null, OcrCreateDocumentOptions.AutoDeleteFile))
        {
            // Create IOcrPage from loaded image
            _ocrPage = _ocrEngine.CreatePage(_viewer.Image, OcrImageSharingMode.AutoDispose);
            // Recognize Text
            _ocrPage.Recognize(null);
            // Add the page
            ocrDocument.Pages.Add(_ocrPage);
            // Save page as documentation
            SaveFileDialog saveDlg = new SaveFileDialog();
            saveDlg.InitialDirectory = @"C:\LEADTOOLS22\Resources\Images";
            saveDlg.Filter = "Adobe Portable Document Format|*.pdf";
            if (saveDlg.ShowDialog(this) != DialogResult.OK)
                return;
            ocrDocument.Save(saveDlg.FileName, DocumentFormat.Pdf, null);
            MessageBox.Show($"OCR output saved to {saveDlg.FileName}");
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.ToString());
    }
}

private void saveAsSearchablePDFToolStripMenuItem_Click(object sender, EventArgs e)
{
    try
    {
        // Create a document
        using (IOcrDocument ocrDocument = _ocrEngine.DocumentManager.CreateDocument(null, OcrCreateDocumentOptions.AutoDeleteFile))
        {
            // Create IOcrPage from loaded image
            _ocrPage = _ocrEngine.CreatePage(_viewer.Image, OcrImageSharingMode.AutoDispose);
            // Recognize Text
            _ocrPage.Recognize(null);
            // Add the page
            ocrDocument.Pages.Add(_ocrPage);
            // Save page as documentation
            SaveFileDialog saveDlg = new SaveFileDialog();
            saveDlg.InitialDirectory = @"C:\LEADTOOLS22\Resources\Images";
            saveDlg.Filter = "Adobe Portable Document Format|*.pdf";
            if (saveDlg.ShowDialog(this) != DialogResult.OK)
                return;
            ocrDocument.Save(saveDlg.FileName, DocumentFormat.Pdf, null);
            MessageBox.Show($"OCR output saved to {saveDlg.FileName}");
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.ToString());
    }
}

Private Sub saveAsSearchablePDFToolStripMenuItem_Click(ByVal sender As Object, ByVal e As EventArgs)
	Try
		' Create a document
		Using ocrDocument As IOcrDocument = _ocrEngine.DocumentManager.CreateDocument(Nothing, OcrCreateDocumentOptions.AutoDeleteFile)
			' Create IOcrPage from loaded image
			_ocrPage = _ocrEngine.CreatePage(_viewer.Image, OcrImageSharingMode.AutoDispose)
			' Recognize Text
			_ocrPage.Recognize(Nothing)
			' Add the page
			ocrDocument.Pages.Add(_ocrPage)
			' Save page as documentation
			Dim saveDlg As New SaveFileDialog()
			saveDlg.InitialDirectory = "C:\LEADTOOLS22\Resources\Images"
			saveDlg.Filter = "Adobe Portable Document Format|*.pdf"
			If saveDlg.ShowDialog(Me) <> DialogResult.OK Then
				Return
			End If
			ocrDocument.Save(saveDlg.FileName, DocumentFormat.Pdf, Nothing)
			MessageBox.Show($"OCR output saved to {saveDlg.FileName}")
		End Using
	Catch ex As Exception
		MessageBox.Show(ex.ToString())
	End Try
End Sub

8.1 IronOCR Compatibility

8.2 LeadTools Compatibility

9.1. LeadTools Licensing

LeadTools provide two (2) key licensing components in the SDK license:

• A "Development License" permits a programmer to use the SDK for development.
• A "Deployment License" allowing the customer to deploy or distribute the end-user application created using the SDK redistributable files that contain LeadTool's intellectual property.

Development License

To develop with LEADTOOLS, you'll need a Development License. The Development License can be purchased directly from LEAD or through a LEAD-authorized reseller or distributor.

The Development License enables a customer to install the SDK on a development machine, and use it to create an end-user application by including specific redistributable libraries and files into the application using the SDK sample code and documentation.

Deployment License

The customer's use of the SDK-developed end-user application ("End User Software") is governed by the Deployment License.

Unlike a standard end-user application license agreement, which prohibits any copying of the application, an SDK license allows the user to copy and redistribute a portion of the SDK. In order to reproduce LEAD's intellectual property and deploy it with end-user software produced using the LEAD SDK, LEAD's clients must obtain the necessary deployment license.

9.1.2. Pricing

LeadTools does not provide free licenses for its developers. Instead, it provides comprehensive developer-based licensing. To see the Lead Technologies OCR SDK price structure, visit here.

9.2. IronOCR Licensing

IronOCR is a library that provides a developer's license for free. IronPDF also has a distinct pricing structure; the Lite bundle starts at $799 with no hidden fees. The redistribution of SaaS and OEM products is also possible. All licenses come with a 30-day money-back guarantee, a year of software support and upgrades, dev/staging/production validity, and a perpetual license (one-time purchase). To see IronOCR's entire price structure and licensing details, go here.

You can get the redistribution of SaaS and OEM products royalty-free service for just a $1,599 single-time purchase.

10.1. Summary

IronOCR is a .NET SDK library that uses the world's most powerful Tesseract engine called Iron Tesseract. It supports over 125+ international languages. IronOCR is an awesome doc scanner app with a lot of imaging features such as OCR region of an image, text extraction from images, fixing a low resolution image and performing OCR on a specific region of an image, and many other related features. IronOCR focuses on providing speed with accuracy, and its accuracy rate of 99.8% is higher than any other OCR Tesseract out there. IronOCR works out of the box with no need to tune performance or heavily modify input images. On top of all of that, you can always get all five of the Iron Software products for the price of just two. Click here to see the webpage.

1. IronPDF
2. IronOCR
3. IronXL
4. Iron Barcode
5. IronWebScraper

The LeadTools OCR is a toolkit from LeadTools that provides most recognition features quickly and efficiently. Programmers can conduct character recognition on document pictures, and output recognized text to over 20 file formats using the LEADTOOLS OCR class library. Its library can be integrated with most of the programming languages and nearly all of the platforms available out there. Its features include:

• Fast and Accurate OCR with multithreaded support
• Broad OCR language character-set support, including Latin, Cyrillic, East Asian and Arabic
• Save OCR results to over 40 output formats including searchable PDF, PDF/A, Word and XML
• Full-page and zonal OCR
• Built-in and custom spelling dictionaries to improve OCR results
• Powerful document image cleanup and preprocessing functions to improve OCR results from scanned images

10.2. Conclusion

IronOCR and LeadTools OCR are both top-of-the-line tools and provide all the features that a C# or .NET developer could wish for. IronOCR is easier to use and code than its competitor. Both sets of software do not incur ongoing costs, but IronOCR is a lot more price-efficient than the LeadTools OCR Library. IronOCR provides more accuracy than any of its competitors out there. IronOCR provides international language support for 125+ languages. On the other hand, LeadTools only provides support for 40+ languages. Taking into account all the various aspects of performance, the only conclusion we can draw is that IronOCR holds significant advantages over LeadTools OCR.