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Published March 27, 2024

How to Read Identity Documents Using OCR in C#

Introduction

Optical Character Recognition (OCR) technology has become an invaluable tool for automating the extraction of text from images, enabling efficient data retrieval and analysis and avoiding human error. This technology can be used to read driving licenses, passports, Institution official documents, ID cards, residence permit cards, and travel documents of multiple languages and different countries to the exact expiration date, nationality date of birth, etc. All the data extracted can be further fed to machine learning and artificial intelligence software products.

In this article, we will explore how to leverage IronOCR, a powerful OCR library in C# from IronSoftware, to read and extract information from identity documents. IronOCR provides a straightforward and flexible OCR solution in the form of APIs for OCR tasks, making it an excellent choice for developers looking to integrate OCR software capabilities into their applications.

IronOCR enables computers to recognize and extract text from images, scan existing documents, or any other visual representation of text. To extract data, it involves a series of complex processes that mimic the way humans perceive and interpret text visually. This process involves Image Pre-processing, Text Detection, Character Segmentation, Feature Extraction, Character Recognition, and Post-Processing to correct errors.

How to Read Identity Documents Using OCR in C#

1. Create a new C# project in Visual Studio
2. Install the IronOCR .NET library and add it to your project.
3. Read Identity document Images using the IronOCR library.
4. Read the Identity document from PDFs.

IronOCR, crafted and maintained by Iron Software, serves as a powerful library for C# Software Engineers, facilitating OCR, Barcode Scanning, and Text Extraction within .NET projects.

Key Features of IronOCR

Text Reading Versatility

Capable of reading relevant data from various formats, including images (JPEG, PNG, GIFF, TIFF, BMP), Streams, and PDFs.

Image Enhancement

Corrects low-quality scans and photos through an array of filters such as Deskew, Denoise, Binarize, Enhance Resolution, Dilate, and more.

Barcode Recognition

Supports reading barcodes from a wide range of formats, encompassing over 20 barcode types, with added QR code recognition.

Tesseract OCR Integration

Utilizes the latest build of Tesseract OCR, finely tuned for optimal performance in extracting text from images.

Flexible Output Options

Allows the export of searchable PDFs, HTML, and text content from image files, offering flexibility in managing extracted information.

Now, let's delve into the development of a demo application that utilizes IronOCR to read ID documents.

Prerequisites

1. Visual Studio: Ensure you have Visual Studio or any other C# development environment installed.

2. NuGet Package Manager: Make sure you can use NuGet to manage packages in your project

Step 1: Create a New C# Project in Visual Studio

Begin by creating a fresh C# console application in Visual Studio, or alternatively, utilize an existing project. Select Add New Project from the Menu, then select console application from the templates below.

Provide a project name and location in the below windows

Select the required .NET Version

Click the Create button to create the new project.

Step 2: Install the IronOCR library and add it to your project.

IronOCR can be found in the NuGet package manager and can be installed using the command prompt with the below commands.

IronOCR can be installed using Visual Studio. Open NuGet Package manager and search for IronOCR like below and click install

Once installed, the application is ready to make use of IronOCR to read any identity document for data extraction, and identity verification which will reduce manual data entry work.

Step 3: Read Identity document Images using the IronOCR library

Using OCR for processing ID documents involves many steps, which are detailed below.

Image Pre-processing

The OCR ID document processing begins with acquiring an image containing text. This image could be a scanned ID documents, a photograph of ID cards, or any other visual representation of text. Identity card pre-processing steps may include resizing, noise reduction, and enhancement to improve the quality and clarity of the image.

Text Detection

OCR algorithms need to locate the specific data areas within the image where text is present. This step involves identifying text regions or bounding boxes.

Character Segmentation

Once text regions or data fields are identified, the image is further analyzed to segment individual characters. This step is crucial for languages that use distinct characters, like English or Chinese.

Feature Extraction

OCR algorithms analyze the segmented characters to extract features that help in differentiating between different characters. These features might include stroke patterns, shape, and spatial relationships between elements.

Character Recognition

Based on the extracted features, OCR algorithms classify each segmented character and assign it a corresponding textual representation. Machine learning models, such as neural networks, are often employed in this step.

Post-Processing

The recognized characters may undergo post-processing to correct errors or enhance accuracy. This step may involve dictionary-based corrections, context analysis, or language modeling.

IronOCR library takes care of all the above steps and allows us to perform OCR using just a few lines of code, saving time-consuming tedious tasks.

using IronOcr;
class Program
{
    public static void Main()
    {
        IronTesseract ocrTesseract = new IronTesseract()
        {
            Language = OcrLanguage.EnglishBest,
            Configuration = new TesseractConfiguration()
            {
                ReadBarCodes = false,
                BlackListCharacters = "`ë|^",
                PageSegmentationMode = TesseractPageSegmentationMode.AutoOsd,
            }
        };
        using var ocrInput = new OcrInput("id1.png");
        var ocrResult = ocrTesseract.Read(ocrInput);
        Console.WriteLine(ocrResult.Text);
    }
}

using IronOcr;
class Program
{
    public static void Main()
    {
        IronTesseract ocrTesseract = new IronTesseract()
        {
            Language = OcrLanguage.EnglishBest,
            Configuration = new TesseractConfiguration()
            {
                ReadBarCodes = false,
                BlackListCharacters = "`ë|^",
                PageSegmentationMode = TesseractPageSegmentationMode.AutoOsd,
            }
        };
        using var ocrInput = new OcrInput("id1.png");
        var ocrResult = ocrTesseract.Read(ocrInput);
        Console.WriteLine(ocrResult.Text);
    }
}

Imports IronOcr
Friend Class Program
	Public Shared Sub Main()
		Dim ocrTesseract As New IronTesseract() With {
			.Language = OcrLanguage.EnglishBest,
			.Configuration = New TesseractConfiguration() With {
				.ReadBarCodes = False,
				.BlackListCharacters = "`ë|^",
				.PageSegmentationMode = TesseractPageSegmentationMode.AutoOsd
			}
		}
		Dim ocrInput As New OcrInput("id1.png")
		Dim ocrResult = ocrTesseract.Read(ocrInput)
		Console.WriteLine(ocrResult.Text)
	End Sub
End Class

Input Image

Below is a sample image used as input to the program

Output

Code Explanation

The above code uses the IronOCR library to read all the text fields in the ID document. We use the IronTesseract class from the IronOCR library and configure it to use the English language and some blacklisted characters. Then we declare the OCR input using the OcrInput class, then read the text from the image. The extracted text fields can be seen in the console output.

Step 4: Read Identity documents from PDFs.

We can also read from PDF documents. For this, we can use the IronPDF library from IronSoftware. First, install the library like below

using IronOcr;
using IronPdf;
class Program
{
    public static void Main()
    {
        var pdfReader = new PdfDocument("id1.pdf");
        var ocrTesseract = new IronTesseract();
        using var ocrInput = new OcrInput();
        ocrInput.AddPdf(pdfReader.Stream);
        var ocrResult = ocrTesseract.Read(ocrInput);
        Console.WriteLine(ocrResult.Text);
    }
}

using IronOcr;
using IronPdf;
class Program
{
    public static void Main()
    {
        var pdfReader = new PdfDocument("id1.pdf");
        var ocrTesseract = new IronTesseract();
        using var ocrInput = new OcrInput();
        ocrInput.AddPdf(pdfReader.Stream);
        var ocrResult = ocrTesseract.Read(ocrInput);
        Console.WriteLine(ocrResult.Text);
    }
}

Imports IronOcr
Imports IronPdf
Friend Class Program
	Public Shared Sub Main()
		Dim pdfReader = New PdfDocument("id1.pdf")
		Dim ocrTesseract = New IronTesseract()
		Dim ocrInput As New OcrInput()
		ocrInput.AddPdf(pdfReader.Stream)
		Dim ocrResult = ocrTesseract.Read(ocrInput)
		Console.WriteLine(ocrResult.Text)
	End Sub
End Class

The above code uses IronPDF to load the id.PDF document and this PDF is passed as stream to OcrInput and ocrTesseract.

Output

Licensing (Free Trial Available)

IronOCR. This key needs to be placed in appsettings.json.

"IRONOCR-LICENSE-KEY": "your license key"

"IRONOCR-LICENSE-KEY": "your license key"

'INSTANT VB TODO TASK: The following line uses invalid syntax:
'"IRONOCR-LICENSE-KEY": "your license key"

Provide user email ID to get a trial license.

Use cases

1. Identity Verification in Financial Services:

Use Case: Banks and financial institutions utilize OCR to read identity documents such as passports, driver's licenses, and ID cards during the customer onboarding and KYC process.

Benefits: Ensures accurate and efficient identity verification for account creation, loan applications, and other financial transactions.

2. Border Control and Immigration:

Use Case: Immigration authorities employ OCR technology to read and authenticate information from passports and visas at border checkpoints.

Benefits: Streamlines the immigration process, enhances security, and reduces manual data entry errors.

3. Access Control and Security:

Use Case: OCR is used in access control systems to read information from ID cards, employee badges, or facial recognition scans for secure entry into buildings or restricted areas.

Benefits: Enhances security by ensuring only authorized individuals gain access and provides a digital record of entries.

4. E-Government Services:

Use Case: Government agencies use OCR to process and verify ID documents submitted online for services such as driver's license renewals, tax filings, and permit applications.

Benefits: Improves efficiency, reduces paperwork, and enhances the overall citizen experience.

5. Healthcare Identity Verification:

Use Case: Healthcare providers use OCR to read information from patient IDs, insurance cards, and other identity documents for accurate patient record-keeping.

Benefits: Facilitates precise patient identification, ensures proper medical record management, and supports billing processes.

6. Automated Hotel Check-In:

Use Case: Hotels implement OCR for automated check-in processes by scanning guests' identity documents, streamlining the registration process.

Benefits: Enhances guest experience, reduces check-in time, and minimizes errors in capturing guest information.

7. Smart Cities and Public Services:

Use Case: OCR is applied in smart city initiatives to read identity documents for services like public transportation access, library memberships, and city event registrations.

Benefits: Improves the efficiency of public services, facilitates seamless access, and enhances urban living experiences.

8. Education Administration:

Use Case: Educational institutions use OCR to process and verify ID documents during student admissions, examinations, and issuance of academic credentials.

Benefits: Ensures accurate student records, reduces administrative burden, and enhances the integrity of academic processes.

Conclusion

Integrating OCR technology into your C# application using IronOCR allows you to efficiently extract information from ID documents. This comprehensive guide provides the necessary steps to set up your project and use IronOCR to read and process identity document images. Experiment with the code examples to tailor the extraction process to your specific requirements, providing a seamless and automated solution for handling identity document data.