using IronOcr; using System; var ocrTesseract = new IronTesseract(); using (var ocrInput = new OcrInput(@"images\image.png")) { // Note: You don't need all of them; most users only need Deskew() and occasionally DeNoise() ocrInput.WithTitle("My Document"); ocrInput.Binarize(); ocrInput.Contrast(); ocrInput.Deskew(); ocrInput.DeNoise(); ocrInput.Despeckle(); ocrInput.Dilate(); ocrInput.EnhanceResolution(300); ocrInput.Invert(); ocrInput.Rotate(90); ocrInput.Scale(150); ocrInput.Sharpen(); ocrInput.ToGrayScale(); ocrInput.Erode(); // WIZARD - If you are unsure use the debug-wizard to test all combinations: string codeToRun = OcrInputFilterWizard.Run(@"images\image.png", out double confidence, ocrTesseract); Console.WriteLine(codeToRun); // Optional: Export modified images so you can view them. foreach (var page in ocrInput.Pages) { page.SaveAsImage($"filtered_{page.Index}.bmp"); } var ocrResult = ocrTesseract.Read(ocrInput); Console.WriteLine(ocrResult.Text); }

Imports IronOcr Imports System Private ocrTesseract = New IronTesseract() Using ocrInput As New OcrInput("images\image.png") ' Note: You don't need all of them; most users only need Deskew() and occasionally DeNoise() ocrInput.WithTitle("My Document") ocrInput.Binarize() ocrInput.Contrast() ocrInput.Deskew() ocrInput.DeNoise() ocrInput.Despeckle() ocrInput.Dilate() ocrInput.EnhanceResolution(300) ocrInput.Invert() ocrInput.Rotate(90) ocrInput.Scale(150) ocrInput.Sharpen() ocrInput.ToGrayScale() ocrInput.Erode() ' WIZARD - If you are unsure use the debug-wizard to test all combinations: Dim confidence As Double Dim codeToRun As String = OcrInputFilterWizard.Run("images\image.png", confidence, ocrTesseract) Console.WriteLine(codeToRun) ' Optional: Export modified images so you can view them. For Each page In ocrInput.Pages page.SaveAsImage($"filtered_{page.Index}.bmp") Next page Dim ocrResult = ocrTesseract.Read(ocrInput) Console.WriteLine(ocrResult.Text) End Using

using IronOcr; using IronSoftware.Drawing; // 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 ocrTesseract = new IronTesseract(); ocrTesseract.Configuration.ReadBarCodes = true; using (var ocrInput = new OcrInput(@"example.tiff")) { OcrResult ocrResult = ocrTesseract.Read(ocrInput); foreach (var page in ocrResult.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; AnyBitmap PageImage = page.ToBitmap(ocrInput); 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; AnyBitmap ParagraphImage = paragraph.ToBitmap(ocrInput); 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; AnyBitmap LineImage = line.ToBitmap(ocrInput); 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; AnyBitmap WordImage = word.ToBitmap(ocrInput); 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; AnyBitmap CharacterImage = character.ToBitmap(ocrInput); 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 IronSoftware.Drawing ' 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 ocrTesseract = New IronTesseract() ocrTesseract.Configuration.ReadBarCodes = True Using ocrInput As New OcrInput("example.tiff") Dim ocrResult As OcrResult = ocrTesseract.Read(ocrInput) For Each page In ocrResult.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 AnyBitmap = page.ToBitmap(ocrInput) 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 AnyBitmap = paragraph.ToBitmap(ocrInput) 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 AnyBitmap = line.ToBitmap(ocrInput) 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 AnyBitmap = word.ToBitmap(ocrInput) 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 AnyBitmap = character.ToBitmap(ocrInput) 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 Using

IronOCR Blog

December 7, 2022

Best OCR for Chinese (Free & Online Tools)

OCR tools can help you convert text from Chinese to other languages accurately, and they can also help you fix errors in Chinese documents.

IronOCR Blog

Ready to get started? Version: 2023.1 just released