C#で画像文字認識・テキスト抽出を行う方法 with IronOCR

/* :path=/static-assets/ocr/content-code-examples/how-to/input-images-read.cs */
using IronOcr;

// Instantiate IronTesseract
IronTesseract ocrTesseract = new IronTesseract();

// Add image
using var imageInput = new OcrImageInput("Potter.png");

// Perform OCR
OcrResult ocrResult = ocrTesseract.Read(imageInput);

// Display the extracted text
Console.WriteLine(ocrResult.Text);

// Get confidence level
double confidence = ocrResult.Confidence;
Console.WriteLine($"Confidence: {confidence}%");

Imports IronOcr

' Instantiate IronTesseract
Dim ocrTesseract As New IronTesseract()

' Add image
Using imageInput As New OcrImageInput("Potter.png")
    ' Perform OCR
    Dim ocrResult As OcrResult = ocrTesseract.Read(imageInput)

    ' Display the extracted text
    Console.WriteLine(ocrResult.Text)

    ' Get confidence level
    Dim confidence As Double = ocrResult.Confidence
    Console.WriteLine($"Confidence: {confidence}%")
End Using

using IronOcr;
using System.IO;

// Instantiate IronTesseract
IronTesseract ocrTesseract = new IronTesseract();

// Read byte from file
byte[] data = File.ReadAllBytes("Potter.tiff");

// Import image byte
using var imageInput = new OcrImageInput(data);
// Perform OCR
OcrResult ocrResult = ocrTesseract.Read(imageInput);

Imports IronOcr
Imports System.IO

' Instantiate IronTesseract
Private ocrTesseract As New IronTesseract()

' Read byte from file
Private data() As Byte = File.ReadAllBytes("Potter.tiff")

' Import image byte
Private imageInput = New OcrImageInput(data)
' Perform OCR
Private ocrResult As OcrResult = ocrTesseract.Read(imageInput)

using IronOcr;
using IronSoftware.Drawing;
using System;

// Instantiate IronTesseract
IronTesseract ocrTesseract = new IronTesseract();

// Specify crop region
Rectangle scanRegion = new Rectangle(800, 200, 900, 400);

// Add image
using var imageInput = new OcrImageInput("Potter.tiff", ContentArea: scanRegion);
// Perform OCR
OcrResult ocrResult = ocrTesseract.Read(imageInput);

// Output the result to console
Console.WriteLine(ocrResult.Text);

Imports IronOcr
Imports IronSoftware.Drawing
Imports System

' Instantiate IronTesseract
Private ocrTesseract As New IronTesseract()

' Specify crop region
Private scanRegion As New Rectangle(800, 200, 900, 400)

' Add image
Private imageInput = New OcrImageInput("Potter.tiff", ContentArea:= scanRegion)
' Perform OCR
Private ocrResult As OcrResult = ocrTesseract.Read(imageInput)

' Output the result to console
Console.WriteLine(ocrResult.Text)

using IronOcr;

IronTesseract ocr = new IronTesseract();

using var input = new OcrImageInput("low-quality-scan.jpg");

// Apply image enhancement filters
input.Deskew();  // Correct image rotation
input.DeNoise(); // Remove background noise
input.Binarize(); // Convert to black and white
input.EnhanceResolution(300); // Adjust DPI for better accuracy

// Configure for better accuracy
ocr.Configuration.WhiteListCharacters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
ocr.Configuration.Language = OcrLanguage.English;

OcrResult result = ocr.Read(input);

Imports IronOcr

Dim ocr As New IronTesseract()

Using input As New OcrImageInput("low-quality-scan.jpg")
    ' Apply image enhancement filters
    input.Deskew()  ' Correct image rotation
    input.DeNoise() ' Remove background noise
    input.Binarize() ' Convert to black and white
    input.EnhanceResolution(300) ' Adjust DPI for better accuracy

    ' Configure for better accuracy
    ocr.Configuration.WhiteListCharacters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
    ocr.Configuration.Language = OcrLanguage.English

    Dim result As OcrResult = ocr.Read(input)
End Using