1. IronOCR
  2. 操作指南
  3. 流
如何在 C# 中使用輸入影像進行 OCR 處理

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How to Read from Streams

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流數據指的是可以讀取或寫入的二進制信息的連續流。 在程式設計和資料處理的背景下，流被用來有效地處理可能太大而無法完全放入記憶體的資料。 流允許以較小且可管理的區塊來讀取或寫入資料。

IronOCR的匯入方法也接受圖像的數據流以便匯入和讀取。 這可以透過簡單地將流數據傳遞給其中一個匯入方法來完成。 該方法將處理匯入圖像所需的所有步驟。

快速開始：在幾秒內使用流作為OCR輸入

這個簡單的例子展示了如何立即開始OCR，只需將System.IO.Stream餵給IronOCR，就可以跳過檔案路徑，以最少的設定和代碼直接取得識別文本。

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  1. Install IronOCR with NuGet Package Manager

    PM > Install-Package IronOcr

  2. Copy and run this code snippet.

    using var input = new IronOcr.OcrInput(stream);
var result = new IronOcr.IronTesseract().Read(input);

  3. Deploy to test on your live environment

    Start using IronOCR in your project today with a free trial
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class="hsg-featured-snippet">

簡化工作流程（5步驟）

  1. 下載一個C#庫以從流中讀取
  2. 獲取並準備圖像流數據
  3. 將圖像流傳遞給OcrImageInput構造函數以匯入圖像
  4. 使用Read方法進行OCR
  5. 通過指定裁剪區域來定義讀取區域


讀取流範例

首先，實例化IronTesseract類以進行OCR。 使用AnyBitmap的FromFile方法匯入圖像文件。這個AnyBitmap對象將能夠將圖像資料轉換為流。 接下來，使用using語句來透過AnyBitmap對象的GetStream方法傳遞圖像流創建OcrImageInput對象。 最後，使用Read方法進行OCR。

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

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

// Read image file to AnyBitmap
AnyBitmap anyBitmap = AnyBitmap.FromFile("Potter.tiff");

// Import image stream
using var imageInput = new OcrImageInput(anyBitmap.GetStream());
// Perform OCR
OcrResult ocrResult = ocrTesseract.Read(imageInput);
Imports IronOcr
Imports IronSoftware.Drawing

' Instantiate IronTesseract
Private ocrTesseract As New IronTesseract()

' Read image file to AnyBitmap
Private anyBitmap As AnyBitmap = AnyBitmap.FromFile("Potter.tiff")

' Import image stream
Private imageInput = New OcrImageInput(anyBitmap.GetStream())
' Perform OCR
Private ocrResult As OcrResult = ocrTesseract.Read(imageInput)
$vbLabelText   $csharpLabel

指定掃描區域

為了提高大圖像的性能並從某些區域獲取特定讀取結果，您可以使用CropRectangle類。 OcrImageInput構造函數接受一個CropRectangle對像作為第二個參數。 這允許您指定應讀取圖像文件的哪個區域。 在下面的代碼示例中，我指定僅應讀取章節編號和標題區域。

:path=/static-assets/ocr/content-code-examples/how-to/input-streams-read-specific-region.cs
using IronOcr;
using IronSoftware.Drawing;
using System;

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

// Read image file to AnyBitmap
AnyBitmap anyBitmap = AnyBitmap.FromFile("Potter.tiff");

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

// Add image
using var imageInput = new OcrImageInput(anyBitmap.GetStream(), 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()

' Read image file to AnyBitmap
Private anyBitmap As AnyBitmap = AnyBitmap.FromFile("Potter.tiff")

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

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

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

OCR 結果

class="content-img-align-center">
class="center-image-wrapper"> 閱讀特定區域

常見問題解答

如何在.NET C#中讀取影像流以進行OCR處理？

在 .NET C# 中，您可以使用 IronOCR 的導入方法來讀取影像流，只需將流資料傳遞給OcrImageInput建構函式即可。此方法可以有效率地處理影像資料以進行 OCR 處理。

在 IronOCR 中使用串流進行 OCR 有什麼好處？

IronOCR 利用資料流技術，將資料分割成更小、更易於管理的區塊進行處理，從而有效率地處理大型影像檔案。這種方法優化了記憶體使用，並加快了 OCR 處理速度。

如何在 C# 中指定要進行 OCR 辨識的影像區域？

若要使用 IronOCR 指定影像的 OCR 區域，可以使用CropRectangle類別。將此類作為參數傳遞給OcrImageInput建構函數，即可聚焦於影像的特定區域。

IronOCR 能否處理即時影像串流 OCR？

是的，IronOCR 可以即時處理影像流 OCR，它會持續處理接收到的影像資料流。這項功能對於需要即時文字辨識的應用非常有利。

如何提高大圖像的OCR辨識性能？

若要提高 IronOCR 在大影像上的 OCR 效能，請使用CropRectangle類別指定掃描區域，將處理限制在相關區域，從而減少需要分析的資料量。

IronOCR 中OcrImageInput構造函數的作用是什麼？

IronOCR 中的OcrImageInput建構函式用於匯入影像流，並可選擇性地定義用於 OCR 處理的特定感興趣區域。它簡化了準備用於文本提取的圖像的過程。

IronOCR 中的Read方法是如何運作的？

IronOCR 中的Read方法對提供的影像流執行光學字元辨識過程。它從圖像資料中提取文字並返回識別出的字元。

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