VB.NET OCR
- # Alternative to an Open Source OCR Library
- # Read text from image in VB.NET
- # Documentation examples for C#
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Examples
// Nuget PM> Install-Package IronOcr
using IronOcr;
string imageText = new IronTesseract().Read(@"images\image.png").Text;' Nuget PM> Install-Package IronOcr
Imports IronOcr
Private imageText As String = (New IronTesseract()).Read("images\image.png").Textusing IronOcr;
var Ocr = new IronTesseract();
using (var Input = new OcrInput())
{
// OCR entire document
Input.AddPdf("example.pdf", "password");
// Alternatively OCR selected page numbers
Input.AddPdfPages("example.pdf", new[] { 1, 2, 3 }, "password");
var Result = Ocr.Read(Input);
Console.WriteLine(Result.Text);
}Imports IronOcr
Private Ocr = New IronTesseract()
Using Input = New OcrInput()
' OCR entire document
Input.AddPdf("example.pdf", "password")
' Alternatively OCR selected page numbers
Input.AddPdfPages("example.pdf", { 1, 2, 3 }, "password")
Dim Result = Ocr.Read(Input)
Console.WriteLine(Result.Text)
End Usingvar Ocr = new IronTesseract();
Ocr.Configuration.ReadBarCodes = true;
using (var Input = new OcrInput(@"images\imageWithBarcode.png"))
{
var Result = Ocr.Read(Input);
foreach (var barcode in Result.Barcodes) {
Console.WriteLine(barcode.Value);
}
}Dim Ocr = New IronTesseract()
Ocr.Configuration.ReadBarCodes = True
Using Input = New OcrInput("images\imageWithBarcode.png")
Dim Result = Ocr.Read(Input)
For Each barcode In Result.Barcodes
Console.WriteLine(barcode.Value)
Next barcode
End Using//PM> Install-Package IronOcr.Languages.Arabic
using IronOcr;
var Ocr = new IronTesseract();
Ocr.Language = OcrLanguage.Arabic;
using (var Input = new OcrInput(@"images\arabic.gif"))
{
var Result = Ocr.Read(Input);
Console.WriteLine(Result.Text);
}
// Advanced Example
var Ocr2 = new IronTesseract();
Ocr2.UseCustomTesseractLanguageFile("custom_tesseract_files/custom.traineddata");
Ocr2.AddSecondaryLanguage(OcrLanguage.EnglishBest);
using (var Input = new OcrInput(@"images\mixed-lang.pdf"))
{
var Result = Ocr2.Read(Input);
Console.WriteLine(Result.Text);
}'PM> Install-Package IronOcr.Languages.Arabic
Imports IronOcr
Private Ocr = New IronTesseract()
Ocr.Language = OcrLanguage.Arabic
Using Input = New OcrInput("images\arabic.gif")
Dim Result = Ocr.Read(Input)
Console.WriteLine(Result.Text)
End Using
' Advanced Example
Dim Ocr2 = New IronTesseract()
Ocr2.UseCustomTesseractLanguageFile("custom_tesseract_files/custom.traineddata")
Ocr2.AddSecondaryLanguage(OcrLanguage.EnglishBest)
Using Input = New OcrInput("images\mixed-lang.pdf")
Dim Result = Ocr2.Read(Input)
Console.WriteLine(Result.Text)
End Usingusing IronOcr;
var Ocr = new IronTesseract();
using (var Input = new OcrInput(@"images\image.png"))
{
Input.Deskew();
Input.DeNoise();
var Result = Ocr.Read(Input);
Console.WriteLine(Result.Text);
}Imports IronOcr
Private Ocr = New IronTesseract()
Using Input = New OcrInput("images\image.png")
Input.Deskew()
Input.DeNoise()
Dim Result = Ocr.Read(Input)
Console.WriteLine(Result.Text)
End Usingusing IronOcr;
var Ocr = new IronTesseract();
// Fast Dictionary
Ocr.Language = OcrLanguage.EnglishFast;
// Turn off unneeded options
Ocr.Configuration.ReadBarCodes = false;
Ocr.Configuration.RenderSearchablePdfsAndHocr = false;
// Assume text is laid out neatly in an orthogonal document
Ocr.Configuration.PageSegmentationMode = TesseractPageSegmentationMode.Auto;
using (var Input = new OcrInput(@"images\image.png"))
{
var Result = Ocr.Read(Input);
Console.WriteLine(Result.Text);
}Imports IronOcr
Private Ocr = New IronTesseract()
' Fast Dictionary
Ocr.Language = OcrLanguage.EnglishFast
' Turn off unneeded options
Ocr.Configuration.ReadBarCodes = False
Ocr.Configuration.RenderSearchablePdfsAndHocr = False
' Assume text is laid out neatly in an orthogonal document
Ocr.Configuration.PageSegmentationMode = TesseractPageSegmentationMode.Auto
Using Input = New OcrInput("images\image.png")
Dim Result = Ocr.Read(Input)
Console.WriteLine(Result.Text)
End Usingusing IronOcr;
var Ocr = new IronTesseract();
using (var Input = new OcrInput(@"images\image.png"))
{
Input.WithTitle("My Document");
Input.Binarize();
Input.Contrast();
Input.Deskew();
Input.DeNoise();
Input.Dilate();
Input.EnhanceResolution(300);
Input.Invert();
Input.Rotate(90);
Input.Scale(150); // or Input.Scale(3000, 2000);
Input.Sharpen();
Input.ToGrayScale();
// you don't need all of them
// most users only need Deskew() and occasionally DeNoise()
// Optional: Export modified images so you can view them.
foreach(var page in Input.Pages){
page.SaveAsImage("filtered.bmp");
}
var Result = Ocr.Read(Input);
Console.WriteLine(Result.Text);
}Imports IronOcr
Private Ocr = New IronTesseract()
Using Input = New OcrInput("images\image.png")
Input.WithTitle("My Document")
Input.Binarize()
Input.Contrast()
Input.Deskew()
Input.DeNoise()
Input.Dilate()
Input.EnhanceResolution(300)
Input.Invert()
Input.Rotate(90)
Input.Scale(150) ' or Input.Scale(3000, 2000);
Input.Sharpen()
Input.ToGrayScale()
' you don't need all of them
' most users only need Deskew() and occasionally DeNoise()
' Optional: Export modified images so you can view them.
For Each page In Input.Pages
page.SaveAsImage("filtered.bmp")
Next page
Dim Result = Ocr.Read(Input)
Console.WriteLine(Result.Text)
End Usingusing IronOcr;
using System.Drawing; // For image export
// We can delve deep into OCR results as an object model of
// Pages, Barcodes, Paragraphs, Lines, Words and Characters
// This allows us to explore, export and draw OCR content using other APIs/
var Ocr = new IronTesseract();
Ocr.Configuration.ReadBarCodes = true;
using (var Input = new OcrInput(@"example.tiff"))
{
OcrResult Result = Ocr.Read(Input);
foreach (var page in Result.Pages)
{
// Page object
int PageNumber = page.PageNumber;
string PageText = page.Text;
int PageWordCount = page.WordCount;
// null if we dont set Ocr.Configuration.ReadBarCodes = true;
OcrResult.Barcode[] Barcodes = page.Barcodes;
Bitmap PageImage = page.ToBitmap(Input);
int PageWidth = page.Width;
int PageHeight = page.Height;
double PageRotation = page.Rotation; // angular correction in degrees from OcrInput.Deskew()
foreach (var paragraph in page.Paragraphs)
{
// Pages -> Paragraphs
int ParagraphNumber = paragraph.ParagraphNumber;
string ParagraphText = paragraph.Text;
Bitmap ParagraphImage = paragraph.ToBitmap(Input);
int ParagraphX_location = paragraph.X;
int ParagraphY_location = paragraph.Y;
int ParagraphWidth = paragraph.Width;
int ParagraphHeight = paragraph.Height;
double ParagraphOcrAccuracy = paragraph.Confidence;
OcrResult.TextFlow paragrapthText_direction = paragraph.TextDirection;
foreach (var line in paragraph.Lines)
{
// Pages -> Paragraphs -> Lines
int LineNumber = line.LineNumber;
string LineText = line.Text;
Bitmap LineImage = line.ToBitmap(Input); ;
int LineX_location = line.X;
int LineY_location = line.Y;
int LineWidth = line.Width;
int LineHeight = line.Height;
double LineOcrAccuracy = line.Confidence;
double LineSkew = line.BaselineAngle;
double LineOffset = line.BaselineOffset;
foreach (var word in line.Words)
{
// Pages -> Paragraphs -> Lines -> Words
int WordNumber = word.WordNumber;
string WordText = word.Text;
Image WordImage = word.ToBitmap(Input);
int WordX_location = word.X;
int WordY_location = word.Y;
int WordWidth = word.Width;
int WordHeight = word.Height;
double WordOcrAccuracy = word.Confidence;
foreach (var character in word.Characters)
{
// Pages -> Paragraphs -> Lines -> Words -> Characters
int CharacterNumber = character.CharacterNumber;
string CharacterText = character.Text;
Bitmap CharacterImage = character.ToBitmap(Input);
int CharacterX_location = character.X;
int CharacterY_location = character.Y;
int CharacterWidth = character.Width;
int CharacterHeight = character.Height;
double CharacterOcrAccuracy = character.Confidence;
// Output alternative symbols choices and their probability.
// Very useful for spellchecking
OcrResult.Choice[] Choices = character.Choices;
}
}
}
}
}
}Imports IronOcr
Imports System.Drawing ' For image export
' We can delve deep into OCR results as an object model of
' Pages, Barcodes, Paragraphs, Lines, Words and Characters
' This allows us to explore, export and draw OCR content using other APIs/
Private Ocr = New IronTesseract()
Ocr.Configuration.ReadBarCodes = True
Using Input = New OcrInput("example.tiff")
Dim Result As OcrResult = Ocr.Read(Input)
For Each page In Result.Pages
' Page object
Dim PageNumber As Integer = page.PageNumber
Dim PageText As String = page.Text
Dim PageWordCount As Integer = page.WordCount
' null if we dont set Ocr.Configuration.ReadBarCodes = true;
Dim Barcodes() As OcrResult.Barcode = page.Barcodes
Dim PageImage As Bitmap = page.ToBitmap(Input)
Dim PageWidth As Integer = page.Width
Dim PageHeight As Integer = page.Height
Dim PageRotation As Double = page.Rotation ' angular correction in degrees from OcrInput.Deskew()
For Each paragraph In page.Paragraphs
' Pages -> Paragraphs
Dim ParagraphNumber As Integer = paragraph.ParagraphNumber
Dim ParagraphText As String = paragraph.Text
Dim ParagraphImage As Bitmap = paragraph.ToBitmap(Input)
Dim ParagraphX_location As Integer = paragraph.X
Dim ParagraphY_location As Integer = paragraph.Y
Dim ParagraphWidth As Integer = paragraph.Width
Dim ParagraphHeight As Integer = paragraph.Height
Dim ParagraphOcrAccuracy As Double = paragraph.Confidence
Dim paragrapthText_direction As OcrResult.TextFlow = paragraph.TextDirection
For Each line In paragraph.Lines
' Pages -> Paragraphs -> Lines
Dim LineNumber As Integer = line.LineNumber
Dim LineText As String = line.Text
Dim LineImage As Bitmap = line.ToBitmap(Input)
Dim LineX_location As Integer = line.X
Dim LineY_location As Integer = line.Y
Dim LineWidth As Integer = line.Width
Dim LineHeight As Integer = line.Height
Dim LineOcrAccuracy As Double = line.Confidence
Dim LineSkew As Double = line.BaselineAngle
Dim LineOffset As Double = line.BaselineOffset
For Each word In line.Words
' Pages -> Paragraphs -> Lines -> Words
Dim WordNumber As Integer = word.WordNumber
Dim WordText As String = word.Text
Dim WordImage As Image = word.ToBitmap(Input)
Dim WordX_location As Integer = word.X
Dim WordY_location As Integer = word.Y
Dim WordWidth As Integer = word.Width
Dim WordHeight As Integer = word.Height
Dim WordOcrAccuracy As Double = word.Confidence
For Each character In word.Characters
' Pages -> Paragraphs -> Lines -> Words -> Characters
Dim CharacterNumber As Integer = character.CharacterNumber
Dim CharacterText As String = character.Text
Dim CharacterImage As Bitmap = character.ToBitmap(Input)
Dim CharacterX_location As Integer = character.X
Dim CharacterY_location As Integer = character.Y
Dim CharacterWidth As Integer = character.Width
Dim CharacterHeight As Integer = character.Height
Dim CharacterOcrAccuracy As Double = character.Confidence
' Output alternative symbols choices and their probability.
' Very useful for spellchecking
Dim Choices() As OcrResult.Choice = character.Choices
Next character
Next word
Next line
Next paragraph
Next page
End Usingusing IronOcr;
var Ocr = new IronTesseract();
using (var Input = new OcrInput())
{
Input.AddImage(@"images\page1.png");
Input.AddImage(@"images\page2.bmp");
Input.AddImage(@"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.AddImage("images\page1.png")
Input.AddImage("images\page2.bmp")
Input.AddImage("images\page3.tiff")
Input.Deskew()
Dim Result = Ocr.Read(Input)
Result.SaveAsSearchablePdf("searchable.pdf")
End Usingusing IronOcr;
//..
var Ocr = new IronTesseract();
Ocr.Configuration.TesseractVersion = TesseractVersion.Tesseract5;
// This is default
using (var Input = new OcrInput(@"images\image.png"))
{
var Result = Ocr.Read(Input);
Console.WriteLine(Result.Text);
}Imports IronOcr
'..
Private Ocr = New IronTesseract()
Ocr.Configuration.TesseractVersion = TesseractVersion.Tesseract5
' This is default
Using Input = New OcrInput("images\image.png")
Dim Result = Ocr.Read(Input)
Console.WriteLine(Result.Text)
End Using
