Get Started with OCR in C# and VB.NET

Curtis Chau

Updated: 2026年4月22日

IronOCR 是一个 C# 软件库，允许 .NET 平台软件开发人员从图像和 PDF 文档中识别和读取文本。这是一个纯粹的 .NET OCR 库，使用了目前已知的最先进的 Tesseract 引擎。

安装

使用 NuGet 包管理器进行安装

在 Visual Studio 中或通过 NuGet 包管理器在命令行中安装 IronOCR。在 Visual Studio 中，用以下命令导航到控制台：

工具 ->
NuGet 包管理器 ->
软件包管理器控制台

PM > Install-Package IronOcr

Install-Package IronOcr

并查看 NuGet 上的 IronOCR 以了解有关版本更新和安装的更多信息。

还有其他适用于不同平台的 IronOCR NuGet 包：

窗口：https://www.nuget.org/packages/IronOcr IronOcr
Linux：https://www.nuget.org/packages/IronOcr.Linux IronOcr
MacOS：https://www.nuget.org/packages/IronOcr.MacOs IronOcr
MacOS (ARM)：https://www.nuget.org/packages/IronOcr.MacOs.ARM IronOcr

IronOcr.Extensions.AdvancedScan（适用于 Linux 和 macOS）

此软件包适用于使用 Linux 和 Mac 的用户，并希望为 IronOCR 使用高级功能。

故障排除

在此软件包的新版本更新中，IronOCR 将 OpenCV 依赖项合并到软件包内，以简化软件包，因此，如果当前导入 OpenCV 依赖项的开发人员会出现以下错误。

The type of namespace name `OpenCvSharp` could not be found(are you missing a using directive or an assembly reference)

The type of namespace name `OpenCvSharp` could not be found(are you missing a using directive or an assembly reference)

Text

您可以放心地删除 OpenCV 命名空间，问题就会得到解决。

下载 IronOCR .ZIP 文件

您也可以选择通过.ZIP文件下载IronOCR。点击直接下载 DLL。下载 .zip 文件后，您可以

.NET Framework 4.0+ 安装说明：

将 IronOcr.dll 加入 net40 文件夹
然后添加装配参考：
- 系统配置
- 系统绘图
- 系统网络

.NET Standard 和 .NET Core 2.0+ 以及 .NET 5 的说明

将 netstandard2.0 文件夹中的 IronOcr.dll 包含到您的项目中
然后添加一个 NuGet 包引用到：
- 系统绘图.Common 4.7 或更高版本

下载IronOCR安装程序（仅限Windows）

另一种方法是下载我们的 IronOCR 安装程序，该程序将安装 IronOCR 开箱即用所需的所有资源。请注意，此选项仅适用于 Windows 系统。要下载安装程序，请点击这里。下载 .zip 文件后，您可以

.NET Framework 4.0+ 安装说明：

将 IronOcr.dll 加入 net40 文件夹
然后添加装配参考：
- 系统配置
- 系统绘图
- 系统网络

.NET Standard 和 .NET Core 2.0+ 以及 .NET 5 的说明

将 netstandard2.0 文件夹中的 IronOcr.dll 包含到您的项目中
然后添加一个 NuGet 包引用到：
- 系统绘图.Common 4.7 或更高版本

为什么选择 IronOCR？

IronOCR for .NET 是一个易于安装、功能完备且文档齐全的 .NET 软件库。

选择 IronOCR 可实现 99.8%+ OCR 精确度，而无需使用任何外部网络服务、持续收费或通过互联网发送机密文件。

为什么 C# 开发者选择 IronOCR 而不是普通的 Tesseract：

以单个 DLL 或 NuGet 的形式安装
包括开箱即用的 Tesseract 5、4 和 3 引擎。
准确度**99.8%**明显优于普通 Tesseract。
超快速度和多线程
兼容 MVC、WebApp、桌面、控制台和服务器应用程序
无需使用 Exes 或 C# 代码
完全支持 PDF OCR
在几乎所有图像文件或 PDF 上执行 OCR
完全支持 .NET Core、Standard 和 Framework
在 Windows、Mac、Linux、Azure、Docker、Lambda、AWS 上部署
读取条形码和二维码
将 OCR 结果导出为 XHTML
将 OCR 输出为可搜索的 PDF 文档
多线程支持
125 种国际语言，全部通过 NuGet 或 OcrData 文件管理
提取图像、坐标、统计数据和字体。不仅仅是文字。
可用于在商业和专有应用程序中重新发布 Tesseract OCR。

在处理真实世界的图像和不完美的文档（如照片或可能存在数字噪声或瑕疵的低分辨率扫描件）时，_IronOCR 可大显身手。

其他.NET平台的免费OCR库，如其他.NET Tesseract API和网络服务在这些实际使用案例中的表现并不理想。

OCR with Tesseract 5 - Start Coding in C#

下面的代码示例显示了使用 C# 或 VB .NET 从图像中读取文本是多么容易。

一行代码

string Text = new IronTesseract().Read(@"img\Screenshot.png").Text;

string Text = new IronTesseract().Read(@"img\Screenshot.png").Text;

Dim Text As String = (New IronTesseract()).Read("img\Screenshot.png").Text

Dim Text As String = (New IronTesseract()).Read("img\Screenshot.png").Text

可配置的 Hello World.

using IronOcr;

IronTesseract ocr = new IronTesseract();
using OcrInput input = new OcrInput();

// Add multiple images
input.LoadImage("images/sample.jpeg");

OcrResult result = ocr.Read(input);
Console.WriteLine(result.Text);

using IronOcr;

IronTesseract ocr = new IronTesseract();
using OcrInput input = new OcrInput();

// Add multiple images
input.LoadImage("images/sample.jpeg");

OcrResult result = ocr.Read(input);
Console.WriteLine(result.Text);

Imports IronOcr

Private ocr As New IronTesseract()
Private OcrInput As using

' Add multiple images
input.LoadImage("images/sample.jpeg")

Dim result As OcrResult = ocr.Read(input)
Console.WriteLine(result.Text)

Imports IronOcr

Private ocr As New IronTesseract()
Private OcrInput As using

' Add multiple images
input.LoadImage("images/sample.jpeg")

Dim result As OcrResult = ocr.Read(input)
Console.WriteLine(result.Text)

C# PDF OCR

相同的方法也可以用来从任何PDF文档中提取文本。

using IronOcr;

IronTesseract ocr = new IronTesseract();
using OcrInput input = new OcrInput();

// We can also select specific PDF page numbers to OCR
input.LoadPdf("example.pdf", Password: "password");

OcrResult result = ocr.Read(input);
Console.WriteLine(result.Text);

// 1 page for every page of the PDF
Console.WriteLine($"{result.Pages.Length} Pages");

using IronOcr;

IronTesseract ocr = new IronTesseract();
using OcrInput input = new OcrInput();

// We can also select specific PDF page numbers to OCR
input.LoadPdf("example.pdf", Password: "password");

OcrResult result = ocr.Read(input);
Console.WriteLine(result.Text);

// 1 page for every page of the PDF
Console.WriteLine($"{result.Pages.Length} Pages");

Imports IronOcr

Private ocr As New IronTesseract()
Private OcrInput As using

' We can also select specific PDF page numbers to OCR
input.LoadPdf("example.pdf", Password:= "password")

Dim result As OcrResult = ocr.Read(input)
Console.WriteLine(result.Text)

' 1 page for every page of the PDF
Console.WriteLine($"{result.Pages.Length} Pages")

Imports IronOcr

Private ocr As New IronTesseract()
Private OcrInput As using

' We can also select specific PDF page numbers to OCR
input.LoadPdf("example.pdf", Password:= "password")

Dim result As OcrResult = ocr.Read(input)
Console.WriteLine(result.Text)

' 1 page for every page of the PDF
Console.WriteLine($"{result.Pages.Length} Pages")

用于多页 TIFF 的OCR

using IronOcr;

IronTesseract ocr = new IronTesseract();
using OcrInput input = new OcrInput();
var pageindices = new int[] { 1, 2 };
input.LoadImageFrames("multi-frame.tiff", pageindices);
OcrResult result = ocr.Read(input);
Console.WriteLine(result.Text);

using IronOcr;

IronTesseract ocr = new IronTesseract();
using OcrInput input = new OcrInput();
var pageindices = new int[] { 1, 2 };
input.LoadImageFrames("multi-frame.tiff", pageindices);
OcrResult result = ocr.Read(input);
Console.WriteLine(result.Text);

Imports IronOcr

Private ocr As New IronTesseract()
Private OcrInput As using
Private pageindices = New Integer() { 1, 2 }
input.LoadImageFrames("multi-frame.tiff", pageindices)
Dim result As OcrResult = ocr.Read(input)
Console.WriteLine(result.Text)

Imports IronOcr

Private ocr As New IronTesseract()
Private OcrInput As using
Private pageindices = New Integer() { 1, 2 }
input.LoadImageFrames("multi-frame.tiff", pageindices)
Dim result As OcrResult = ocr.Read(input)
Console.WriteLine(result.Text)

条形码和 QR.

IronOCR 的一个独特功能是它可以在扫描文本的同时读取文档中的条形码和二维码。 OcrResult.OcrBarcode类的实例为开发人员提供有关每个被扫描条形码的详细信息。

using IronOcr;

IronTesseract ocr = new IronTesseract();
ocr.Configuration.ReadBarCodes = true;

using OcrInput input = new OcrInput();
input.LoadImage("img/Barcode.png");

OcrResult Result = ocr.Read(input);
foreach (var Barcode in Result.Barcodes)
{
    // type and location properties also exposed
    Console.WriteLine(Barcode.Value);
}

using IronOcr;

IronTesseract ocr = new IronTesseract();
ocr.Configuration.ReadBarCodes = true;

using OcrInput input = new OcrInput();
input.LoadImage("img/Barcode.png");

OcrResult Result = ocr.Read(input);
foreach (var Barcode in Result.Barcodes)
{
    // type and location properties also exposed
    Console.WriteLine(Barcode.Value);
}

Imports IronOcr

Private ocr As New IronTesseract()
ocr.Configuration.ReadBarCodes = True

Using input As New OcrInput()
	input.LoadImage("img/Barcode.png")
	
	Dim Result As OcrResult = ocr.Read(input)
	For Each Barcode In Result.Barcodes
		' type and location properties also exposed
		Console.WriteLine(Barcode.Value)
	Next Barcode
End Using

Imports IronOcr

Private ocr As New IronTesseract()
ocr.Configuration.ReadBarCodes = True

Using input As New OcrInput()
	input.LoadImage("img/Barcode.png")
	
	Dim Result As OcrResult = ocr.Read(input)
	For Each Barcode In Result.Barcodes
		' type and location properties also exposed
		Console.WriteLine(Barcode.Value)
	Next Barcode
End Using

对图像特定区域进行OCR

IronOCR 的所有扫描和阅读方法都能准确指定我们希望从页面的哪个或哪些部分读取文本。当我们查看标准化表单时，这非常有用，可以节省大量时间并提高效率。

要使用裁剪区域，我们需要添加一个系统引用到System.Drawing.Rectangle对象。

using IronOcr;

IronTesseract ocr = new IronTesseract();
using OcrInput input = new OcrInput();

// Dimensions are in pixel
var contentArea = new System.Drawing.Rectangle() { X = 215, Y = 1250, Height = 280, Width = 1335 };

input.LoadImage("document.png", contentArea);

OcrResult result = ocr.Read(input);
Console.WriteLine(result.Text);

using IronOcr;

IronTesseract ocr = new IronTesseract();
using OcrInput input = new OcrInput();

// Dimensions are in pixel
var contentArea = new System.Drawing.Rectangle() { X = 215, Y = 1250, Height = 280, Width = 1335 };

input.LoadImage("document.png", contentArea);

OcrResult result = ocr.Read(input);
Console.WriteLine(result.Text);

Imports IronOcr

Private ocr As New IronTesseract()
Private OcrInput As using

' Dimensions are in pixel
Private contentArea = New System.Drawing.Rectangle() With {
	.X = 215,
	.Y = 1250,
	.Height = 280,
	.Width = 1335
}

input.LoadImage("document.png", contentArea)

Dim result As OcrResult = ocr.Read(input)
Console.WriteLine(result.Text)

Imports IronOcr

Private ocr As New IronTesseract()
Private OcrInput As using

' Dimensions are in pixel
Private contentArea = New System.Drawing.Rectangle() With {
	.X = 215,
	.Y = 1250,
	.Height = 280,
	.Width = 1335
}

input.LoadImage("document.png", contentArea)

Dim result As OcrResult = ocr.Read(input)
Console.WriteLine(result.Text)

用于低质量扫描的OCR

IronOCR OcrInput类可以修复正常Tesseract无法读取的扫描。

using IronOcr;

IronTesseract ocr = new IronTesseract();
using OcrInput input = new OcrInput();
var pageindices = new int[] { 1, 2 };
input.LoadImageFrames(@"img\Potter.tiff", pageindices);

// fixes digital noise and poor scanning
input.DeNoise();

// fixes rotation and perspective
input.Deskew();

OcrResult result = ocr.Read(input);
Console.WriteLine(result.Text);

using IronOcr;

IronTesseract ocr = new IronTesseract();
using OcrInput input = new OcrInput();
var pageindices = new int[] { 1, 2 };
input.LoadImageFrames(@"img\Potter.tiff", pageindices);

// fixes digital noise and poor scanning
input.DeNoise();

// fixes rotation and perspective
input.Deskew();

OcrResult result = ocr.Read(input);
Console.WriteLine(result.Text);

Imports IronOcr

Private ocr As New IronTesseract()
Private OcrInput As using
Private pageindices = New Integer() { 1, 2 }
input.LoadImageFrames("img\Potter.tiff", pageindices)

' fixes digital noise and poor scanning
input.DeNoise()

' fixes rotation and perspective
input.Deskew()

Dim result As OcrResult = ocr.Read(input)
Console.WriteLine(result.Text)

Imports IronOcr

Private ocr As New IronTesseract()
Private OcrInput As using
Private pageindices = New Integer() { 1, 2 }
input.LoadImageFrames("img\Potter.tiff", pageindices)

' fixes digital noise and poor scanning
input.DeNoise()

' fixes rotation and perspective
input.Deskew()

Dim result As OcrResult = ocr.Read(input)
Console.WriteLine(result.Text)

将 OCR 结果导出为可搜索的 PDF 文件

using IronOcr;

IronTesseract ocr = new IronTesseract();
using OcrInput input = new OcrInput();
input.Title = "Quarterly Report";
input.LoadImage("image1.jpeg");
input.LoadImage("image2.png");
var pageindices = new int[] { 1, 2 };
input.LoadImageFrames("image3.gif", pageindices);

OcrResult result = ocr.Read(input);
result.SaveAsSearchablePdf("searchable.pdf");

using IronOcr;

IronTesseract ocr = new IronTesseract();
using OcrInput input = new OcrInput();
input.Title = "Quarterly Report";
input.LoadImage("image1.jpeg");
input.LoadImage("image2.png");
var pageindices = new int[] { 1, 2 };
input.LoadImageFrames("image3.gif", pageindices);

OcrResult result = ocr.Read(input);
result.SaveAsSearchablePdf("searchable.pdf");

Imports IronOcr

Private ocr As New IronTesseract()
Private OcrInput As using
input.Title = "Quarterly Report"
input.LoadImage("image1.jpeg")
input.LoadImage("image2.png")
Dim pageindices = New Integer() { 1, 2 }
input.LoadImageFrames("image3.gif", pageindices)

Dim result As OcrResult = ocr.Read(input)
result.SaveAsSearchablePdf("searchable.pdf")

Imports IronOcr

Private ocr As New IronTesseract()
Private OcrInput As using
input.Title = "Quarterly Report"
input.LoadImage("image1.jpeg")
input.LoadImage("image2.png")
Dim pageindices = New Integer() { 1, 2 }
input.LoadImageFrames("image3.gif", pageindices)

Dim result As OcrResult = ocr.Read(input)
result.SaveAsSearchablePdf("searchable.pdf")

TIFF转可搜索PDF转换

using IronOcr;

IronTesseract ocr = new IronTesseract();
using OcrInput input = new OcrInput();
var pageindices = new int[] { 1, 2 };
input.LoadImageFrames("example.tiff", pageindices);
ocr.Read(input).SaveAsSearchablePdf("searchable.pdf");

using IronOcr;

IronTesseract ocr = new IronTesseract();
using OcrInput input = new OcrInput();
var pageindices = new int[] { 1, 2 };
input.LoadImageFrames("example.tiff", pageindices);
ocr.Read(input).SaveAsSearchablePdf("searchable.pdf");

Imports IronOcr

Private ocr As New IronTesseract()
Private OcrInput As using
Private pageindices = New Integer() { 1, 2 }
input.LoadImageFrames("example.tiff", pageindices)
ocr.Read(input).SaveAsSearchablePdf("searchable.pdf")

Imports IronOcr

Private ocr As New IronTesseract()
Private OcrInput As using
Private pageindices = New Integer() { 1, 2 }
input.LoadImageFrames("example.tiff", pageindices)
ocr.Read(input).SaveAsSearchablePdf("searchable.pdf")

将 OCR 结果导出为 HTML.

using IronOcr;

IronTesseract ocr = new IronTesseract();
using OcrInput input = new OcrInput();
input.Title = "Html Title";
input.LoadImage("image1.jpeg");

OcrResult Result = ocr.Read(input);
Result.SaveAsHocrFile("results.html");

using IronOcr;

IronTesseract ocr = new IronTesseract();
using OcrInput input = new OcrInput();
input.Title = "Html Title";
input.LoadImage("image1.jpeg");

OcrResult Result = ocr.Read(input);
Result.SaveAsHocrFile("results.html");

Imports IronOcr

Private ocr As New IronTesseract()
Private OcrInput As using
input.Title = "Html Title"
input.LoadImage("image1.jpeg")

Dim Result As OcrResult = ocr.Read(input)
Result.SaveAsHocrFile("results.html")

Imports IronOcr

Private ocr As New IronTesseract()
Private OcrInput As using
input.Title = "Html Title"
input.LoadImage("image1.jpeg")

Dim Result As OcrResult = ocr.Read(input)
Result.SaveAsHocrFile("results.html")

OCR 图像增强过滤器

IronOCR为OcrInput对象提供独特的过滤器，以提高OCR性能。

图像增强代码示例

using IronOcr;

IronTesseract ocr = new IronTesseract();
using OcrInput input = new OcrInput();
input.LoadImage("LowQuality.jpeg");

// fixes digital noise and poor scanning
input.DeNoise();

// fixes rotation and perspective
input.Deskew();

OcrResult result = ocr.Read(input);
Console.WriteLine(result.Text);

using IronOcr;

IronTesseract ocr = new IronTesseract();
using OcrInput input = new OcrInput();
input.LoadImage("LowQuality.jpeg");

// fixes digital noise and poor scanning
input.DeNoise();

// fixes rotation and perspective
input.Deskew();

OcrResult result = ocr.Read(input);
Console.WriteLine(result.Text);

Imports IronOcr

Private ocr As New IronTesseract()
Private OcrInput As using
input.LoadImage("LowQuality.jpeg")

' fixes digital noise and poor scanning
input.DeNoise()

' fixes rotation and perspective
input.Deskew()

Dim result As OcrResult = ocr.Read(input)
Console.WriteLine(result.Text)

Imports IronOcr

Private ocr As New IronTesseract()
Private OcrInput As using
input.LoadImage("LowQuality.jpeg")

' fixes digital noise and poor scanning
input.DeNoise()

' fixes rotation and perspective
input.Deskew()

Dim result As OcrResult = ocr.Read(input)
Console.WriteLine(result.Text)

OCR 图像过滤器列表

IronOCR 内置的用于提高 OCR 性能的输入过滤器包括

OcrInput.Rotate(double degrees) - 顺时针旋转图像若干度。对于逆时针旋转，使用负数。
OcrInput.Binarize() - 此滤镜将每个像素转换为黑色或白色，没有中间颜色，可能会在非常低对比度图像中提高OCR性能。
OcrInput.ToGrayScale() - 将每个像素转换为灰度。这可能不会提高准确性，但可以提高速度。
OcrInput.Contrast() - 自动增加对比度，经常能提高低对比度扫描的速度和准确性。
OcrInput.DeNoise() - 移除数字噪声，仅在预料到有噪声时推荐使用。
OcrInput.Invert() - 反转每种颜色（白色变为黑色，反之亦然）。
OcrInput.Dilate() - 进阶形态学处理，增加像素到对象边界，反向于腐蚀。
OcrInput.Erode() - 进阶形态学处理，从对象边界移除像素，反向于膨胀。
OcrInput.Deskew() - 旋转图像以正确定向。这很有用，因为Tesseract的偏斜容忍度是有限的。
OcrInput.EnhanceResolution - 增强低质量图像的分辨率。该设置通常用于自动管理低 DPI 输入。
EnhanceResolution检测低分辨率图像（低于275 dpi），进行上采样，并锐化文本以获得更好的OCR结果。虽然耗时，但通常可以缩短整个 OCR 操作时间。
Language - 支持从22个国际语言包中进行选择。
Strategy - 允许根据单词的统计关系在快速但不精确的方法和高级（使用AI提高准确性）策略之间进行选择。
ColorSpace - 选择在灰度或彩色下进行OCR；通常，灰度最佳，但某些对比度情况下彩色更优.
DetectWhiteTextOnDarkBackgrounds - 调整负片图像，自动检测并读取深色背景上的白色文字。
InputImageType - 指导OCR库，指定它是在处理整个文档还是片段。
RotateAndStraighten - 允许IronOCR妥善处理被旋转或受到透视扭曲影响的文档。
ReadBarcodes - 在文本扫描的同时自动读取条形码和QR码而不会显著增加时间。
ColorDepth - 确定OCR过程中颜色深度的每像素位数。更高的深度可以提高质量，但也会增加处理时间。

125 种语言包

IronOCR 通过语言包支持 125 种国际语言，语言包以 DLL 形式发布，可从本网站下载，或从 NuGet 包管理器下载。

语言包括德语、法语、英语、中文、日语等。专业语言包适用于MRZ、MICR支票、财务数据、车牌等。此外，可以使用自定义Tesseract" .traineddata"文件。

语言示例

using IronOcr;

// PM> Install IronOcr.Languages.Arabic
IronTesseract ocr = new IronTesseract();
ocr.Language = OcrLanguage.Arabic;

using OcrInput input = new OcrInput();

var pageindices = new int[] { 1, 2 };
input.LoadImageFrames("img/arabic.gif", pageindices);
// Add image filters if needed
// In this case, even thought input is very low quality
// IronTesseract can read what conventional Tesseract cannot.
OcrResult result = ocr.Read(input);
// Console can't print Arabic on Windows easily.
// Let's save to disk instead.
result.SaveAsTextFile("arabic.txt");

using IronOcr;

// PM> Install IronOcr.Languages.Arabic
IronTesseract ocr = new IronTesseract();
ocr.Language = OcrLanguage.Arabic;

using OcrInput input = new OcrInput();

var pageindices = new int[] { 1, 2 };
input.LoadImageFrames("img/arabic.gif", pageindices);
// Add image filters if needed
// In this case, even thought input is very low quality
// IronTesseract can read what conventional Tesseract cannot.
OcrResult result = ocr.Read(input);
// Console can't print Arabic on Windows easily.
// Let's save to disk instead.
result.SaveAsTextFile("arabic.txt");

Imports IronOcr

' PM> Install IronOcr.Languages.Arabic
Private ocr As New IronTesseract()
ocr.Language = OcrLanguage.Arabic

Using input As New OcrInput()
	
	Dim pageindices = New Integer() { 1, 2 }
	input.LoadImageFrames("img/arabic.gif", pageindices)
	' Add image filters if needed
	' In this case, even thought input is very low quality
	' IronTesseract can read what conventional Tesseract cannot.
	Dim result As OcrResult = ocr.Read(input)
	' Console can't print Arabic on Windows easily.
	' Let's save to disk instead.
	result.SaveAsTextFile("arabic.txt")
End Using

Imports IronOcr

' PM> Install IronOcr.Languages.Arabic
Private ocr As New IronTesseract()
ocr.Language = OcrLanguage.Arabic

Using input As New OcrInput()
	
	Dim pageindices = New Integer() { 1, 2 }
	input.LoadImageFrames("img/arabic.gif", pageindices)
	' Add image filters if needed
	' In this case, even thought input is very low quality
	' IronTesseract can read what conventional Tesseract cannot.
	Dim result As OcrResult = ocr.Read(input)
	' Console can't print Arabic on Windows easily.
	' Let's save to disk instead.
	result.SaveAsTextFile("arabic.txt")
End Using

多语言示例

还可以同时使用多种语言进行 OCR。这可以增强对 Unicode 文档中的英文元数据和 URL 的 OCR 识别。

using IronOcr;

// PM> Install IronOcr.Languages.ChineseSimplified
IronTesseract ocr = new IronTesseract();
ocr.Language = OcrLanguage.ChineseSimplified;

// We can add any number of languages
ocr.AddSecondaryLanguage(OcrLanguage.English);

using OcrInput input = new OcrInput();
input.LoadPdf("multi-language.pdf");
OcrResult result = ocr.Read(input);
result.SaveAsTextFile("results.txt");

using IronOcr;

// PM> Install IronOcr.Languages.ChineseSimplified
IronTesseract ocr = new IronTesseract();
ocr.Language = OcrLanguage.ChineseSimplified;

// We can add any number of languages
ocr.AddSecondaryLanguage(OcrLanguage.English);

using OcrInput input = new OcrInput();
input.LoadPdf("multi-language.pdf");
OcrResult result = ocr.Read(input);
result.SaveAsTextFile("results.txt");

Imports IronOcr

' PM> Install IronOcr.Languages.ChineseSimplified
Private ocr As New IronTesseract()
ocr.Language = OcrLanguage.ChineseSimplified

' We can add any number of languages
ocr.AddSecondaryLanguage(OcrLanguage.English)

Using input As New OcrInput()
	input.LoadPdf("multi-language.pdf")
	Dim result As OcrResult = ocr.Read(input)
	result.SaveAsTextFile("results.txt")
End Using

Imports IronOcr

' PM> Install IronOcr.Languages.ChineseSimplified
Private ocr As New IronTesseract()
ocr.Language = OcrLanguage.ChineseSimplified

' We can add any number of languages
ocr.AddSecondaryLanguage(OcrLanguage.English)

Using input As New OcrInput()
	input.LoadPdf("multi-language.pdf")
	Dim result As OcrResult = ocr.Read(input)
	result.SaveAsTextFile("results.txt")
End Using

详细的 OCR 结果对象

IronOCR 会为每次操作返回一个 OCR 结果对象。通常，开发人员访问Text属性以获取扫描的文本。不过，结果对象包含的信息要详细得多。

using IronOcr;

IronTesseract ocr = new IronTesseract();

// Must be set to true to read barcode
ocr.Configuration.ReadBarCodes = true;
using OcrInput input = new OcrInput();
var pageindices = new int[] { 1, 2 };
input.LoadImageFrames(@"img\sample.tiff", pageindices);

OcrResult result = ocr.Read(input);
var pages = result.Pages;
var words = pages[0].Words;
var barcodes = result.Barcodes;
// Explore here to find a massive, detailed API:
// - Pages, Blocks, Paraphaphs, Lines, Words, Chars
// - Image Export, Fonts Coordinates, Statistical Data, Tables

using IronOcr;

IronTesseract ocr = new IronTesseract();

// Must be set to true to read barcode
ocr.Configuration.ReadBarCodes = true;
using OcrInput input = new OcrInput();
var pageindices = new int[] { 1, 2 };
input.LoadImageFrames(@"img\sample.tiff", pageindices);

OcrResult result = ocr.Read(input);
var pages = result.Pages;
var words = pages[0].Words;
var barcodes = result.Barcodes;
// Explore here to find a massive, detailed API:
// - Pages, Blocks, Paraphaphs, Lines, Words, Chars
// - Image Export, Fonts Coordinates, Statistical Data, Tables

Imports IronOcr

Private ocr As New IronTesseract()

' Must be set to true to read barcode
ocr.Configuration.ReadBarCodes = True
Using input As New OcrInput()
	Dim pageindices = New Integer() { 1, 2 }
	input.LoadImageFrames("img\sample.tiff", pageindices)
	
	Dim result As OcrResult = ocr.Read(input)
	Dim pages = result.Pages
	Dim words = pages(0).Words
	Dim barcodes = result.Barcodes
	' Explore here to find a massive, detailed API:
	' - Pages, Blocks, Paraphaphs, Lines, Words, Chars
	' - Image Export, Fonts Coordinates, Statistical Data, Tables
End Using

Imports IronOcr

Private ocr As New IronTesseract()

' Must be set to true to read barcode
ocr.Configuration.ReadBarCodes = True
Using input As New OcrInput()
	Dim pageindices = New Integer() { 1, 2 }
	input.LoadImageFrames("img\sample.tiff", pageindices)
	
	Dim result As OcrResult = ocr.Read(input)
	Dim pages = result.Pages
	Dim words = pages(0).Words
	Dim barcodes = result.Barcodes
	' Explore here to find a massive, detailed API:
	' - Pages, Blocks, Paraphaphs, Lines, Words, Chars
	' - Image Export, Fonts Coordinates, Statistical Data, Tables
End Using