C#でコンピュータ ビジョンを使用してテキスト抽出・文字認識を行う方法

using IronOcr;

var ocr = new IronTesseract();
using var input = new OcrInput();
input.LoadImage("/path/file.png");

input.FindTextRegion();
OcrResult result = ocr.Read(input);
string resultText = result.Text;

Imports IronOcr

Private ocr = New IronTesseract()
Private input = New OcrInput()
input.LoadImage("/path/file.png")

input.FindTextRegion()
Dim result As OcrResult = ocr.Read(input)
Dim resultText As String = result.Text

using IronOcr;

var ocr = new IronTesseract();
using var input = new OcrInput();
input.LoadImage("/path/file.png");

input.FindTextRegion(Scale: 2.0, DilationAmount: 20, Binarize: true, Invert: true);
OcrResult result = ocr.Read(input);
string resultText = result.Text;

Imports IronOcr

Private ocr = New IronTesseract()
Private input = New OcrInput()
input.LoadImage("/path/file.png")

input.FindTextRegion(Scale:= 2.0, DilationAmount:= 20, Binarize:= True, Invert:= True)
Dim result As OcrResult = ocr.Read(input)
Dim resultText As String = result.Text

using IronOcr;
using IronSoftware.Drawing;
using System;
using System.Linq;

var ocr = new IronTesseract();
using var input = new OcrInput();
input.LoadImage("wh-words-sign.jpg");

// Find the text region using Computer Vision
Rectangle textCropArea = input.GetPages().First().FindTextRegion();

// For debugging and demonstration purposes, lets see what region it found:
input.StampCropRectangleAndSaveAs(textCropArea, Color.Red, "image_text_area", AnyBitmap.ImageFormat.Png);

// Looks good, so let us apply this region to hasten the read:
var ocrResult = ocr.Read("wh-words-sign.jpg", textCropArea);
Console.WriteLine(ocrResult.Text);

Imports IronOcr
Imports IronSoftware.Drawing
Imports System
Imports System.Linq

Private ocr = New IronTesseract()
Private input = New OcrInput()
input.LoadImage("wh-words-sign.jpg")

' Find the text region using Computer Vision
Dim textCropArea As Rectangle = input.GetPages().First().FindTextRegion()

' For debugging and demonstration purposes, lets see what region it found:
input.StampCropRectangleAndSaveAs(textCropArea, Color.Red, "image_text_area", AnyBitmap.ImageFormat.Png)

' Looks good, so let us apply this region to hasten the read:
Dim ocrResult = ocr.Read("wh-words-sign.jpg", textCropArea)
Console.WriteLine(ocrResult.Text)

using IronOcr;

var ocr = new IronTesseract();
using var input = new OcrInput();
input.LoadImage("/path/file.png");

input.FindMultipleTextRegions();
OcrResult result = ocr.Read(input);
string resultText = result.Text;

Imports IronOcr

Private ocr = New IronTesseract()
Private input = New OcrInput()
input.LoadImage("/path/file.png")

input.FindMultipleTextRegions()
Dim result As OcrResult = ocr.Read(input)
Dim resultText As String = result.Text

using IronOcr;

var ocr = new IronTesseract();
using var input = new OcrInput();
input.LoadImage("/path/file.png");

input.FindMultipleTextRegions(Scale: 2.0, DilationAmount: -1, Binarize: true, Invert: false);
OcrResult result = ocr.Read(input);
string resultText = result.Text;

Imports IronOcr

Private ocr = New IronTesseract()
Private input = New OcrInput()
input.LoadImage("/path/file.png")

input.FindMultipleTextRegions(Scale:= 2.0, DilationAmount:= -1, Binarize:= True, Invert:= False)
Dim result As OcrResult = ocr.Read(input)
Dim resultText As String = result.Text

using IronOcr;
using System.Collections.Generic;
using System.Linq;

int pageIndex = 0;
using var input = new OcrInput();
input.LoadImage("/path/file.png");

var selectedPage = input.GetPages().ElementAt(pageIndex);
List<OcrInputPage> textRegionsOnPage = selectedPage.FindMultipleTextRegions();

Imports IronOcr
Imports System.Collections.Generic
Imports System.Linq

Private pageIndex As Integer = 0
Private input = New OcrInput()
input.LoadImage("/path/file.png")

Dim selectedPage = input.GetPages().ElementAt(pageIndex)
Dim textRegionsOnPage As List(Of OcrInputPage) = selectedPage.FindMultipleTextRegions()

/* :path=/static-assets/ocr/content-code-examples/how-to/computer-vision-gettextregions.cs */
using IronOcr;
using IronSoftware.Drawing;
using System;
using System.Collections.Generic;
using System.Linq;

// Create a new IronTesseract object for OCR
var ocr = new IronTesseract();

// Load an image into OcrInput
using var input = new OcrInput();
input.LoadImage("/path/file.png");

// Get the first page from the input
var firstPage = input.GetPages().First();

// Get all text regions detected on this page
List<Rectangle> textRegions = firstPage.GetTextRegions();

// Display information about each detected region
Console.WriteLine($"Found {textRegions.Count} text regions:");
foreach (var region in textRegions)
{
    Console.WriteLine($"Region at X:{region.X}, Y:{region.Y}, Width:{region.Width}, Height:{region.Height}");
}

// You can also process each region individually
foreach (var region in textRegions)
{
    var regionResult = ocr.Read(input, region);
    Console.WriteLine($"Text in region: {regionResult.Text}");
}

Imports IronOcr
Imports IronSoftware.Drawing
Imports System
Imports System.Collections.Generic
Imports System.Linq

' Create a new IronTesseract object for OCR
Dim ocr As New IronTesseract()

' Load an image into OcrInput
Using input As New OcrInput()
    input.LoadImage("/path/file.png")

    ' Get the first page from the input
    Dim firstPage = input.GetPages().First()

    ' Get all text regions detected on this page
    Dim textRegions As List(Of Rectangle) = firstPage.GetTextRegions()

    ' Display information about each detected region
    Console.WriteLine($"Found {textRegions.Count} text regions:")
    For Each region In textRegions
        Console.WriteLine($"Region at X:{region.X}, Y:{region.Y}, Width:{region.Width}, Height:{region.Height}")
    Next

    ' You can also process each region individually
    For Each region In textRegions
        Dim regionResult = ocr.Read(input, region)
        Console.WriteLine($"Text in region: {regionResult.Text}")
    Next
End Using