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IronOCR
操作指南
修復影像方向
How to Fix Image Orientation for Reading
View the article in
English
在圖像處理的上下文中，修正圖像方向涉及對圖像進行調整，以確保其正確對齊，以符合特定用途，例如文字識別。 IronOcr 支持修正圖像方向，包括旋轉、去偏斜和縮放。
這些技術對於準備圖像進行準確的文字識別至關重要，因為它們確保文字正確方向、對齊和適當大小以便提取。
快速開始：一行旋轉-去偏斜-縮放
使用 IronOCR 的 OcrInput 來旋轉、去偏斜和縮放圖像，只需單次調用即可快速開始，免去樣板代碼，讓您的圖像在幾秒鐘內準備好準確的 OCR 處理。
Install IronOCR with NuGet Package Manager
Copy and run this code snippet.
var result = new IronOcr.OcrInput().LoadImage("skewed.png").Rotate(90).Deskew(45).Scale(150).Let(input => new IronOcr.IronTesseract().Read(input));
Deploy to test on your live environment
Start using IronOCR in your project today with a free trial
class="hsg-featured-snippet">
最小化工作流程 (5 步驟) 下載 C# 庫以修正圖像方向 導入PDF文件和圖像以供閱讀 應用所需的方向校正，如旋轉、去偏斜和縮放 匯出已校正的圖像以供查看 使用 Read 方法進行 OCR 處理
旋轉圖像範例
旋轉圖像涉及將其方向更改為特定角度（例如，順時針或逆時針 90 度），以確保圖像內的文字或內容處於正立且正確對齊。
傳遞一個角度值給 Rotate 方法來執行旋轉。 正角度值將順時針旋轉圖像，而負角度值將逆時針旋轉圖像。
:path=/static-assets/ocr/content-code-examples/how-to/image-orientation-correction-rotate-image.cs
using IronOcr;
// Instantiate IronTesseract
IronTesseract ocrTesseract = new IronTesseract();
// Add image
using var imageInput = new OcrImageInput("paragraph_skewed.png");
// Rotate the image 180 degrees clockwise
imageInput.Rotate(180);
// Export the modified image
imageInput.SaveAsImages("rotate");Imports IronOcr
' Instantiate IronTesseract
Private ocrTesseract As New IronTesseract()
' Add image
Private imageInput = New OcrImageInput("paragraph_skewed.png")
' Rotate the image 180 degrees clockwise
imageInput.Rotate(180)
' Export the modified image
imageInput.SaveAsImages("rotate")
$vbLabelText
$csharpLabel
為了方便起見，可以使用 SaveAsImages 方法匯出修改後的圖像。 以下是旋轉前後圖像的比較。
class="competitors-section__wrapper-even-1">
旋轉前
旋轉後
去偏斜圖像範例
去偏斜是將可能略微傾斜或扭曲的圖像拉直的過程。 它能修正任何傾斜或錯位，確保文字或內容水平對齊。
要對圖像應用去偏斜，請使用 Deskew 方法。 此方法接受一個整數值，指定需要修正的最大偏斜角度。 較高的值可能提供更多修正機會，但可能導致處理速度較慢，並增加錯誤風險，包括頁面上下顛倒。
:path=/static-assets/ocr/content-code-examples/how-to/image-orientation-correction-deskew-image.cs
// Apply deskew
imageInput.Deskew();' Apply deskew
imageInput.Deskew()
$vbLabelText
$csharpLabel
class="competitors-section__wrapper-even-1">
去偏斜前
去偏斜後
縮放圖像範例
縮放涉及將圖像調整為特定尺寸或長寬比。 這對於標準化圖像尺寸以提高文字識別的一致性非常有用。
要對圖像應用縮放，請使用 Scale 方法。 Scale 方法採用百分比值，100% 表示無效果。 第二個參數是 ScaleCropArea，決定是否需要相應等比例縮放關聯的裁剪區域（推薦為 'true'）。
:path=/static-assets/ocr/content-code-examples/how-to/image-orientation-correction-scale-image.cs
// Apply scale
imageInput.Scale(70);' Apply scale
imageInput.Scale(70)
$vbLabelText
$csharpLabel
尺寸比較
class="content-img-align-center">
class="center-image-wrapper">
class="center-image-wrapper">
常見問題解答
在 .NET C# 中，您可以使用 IronOCR 的方法修正影像方向，例如Rotate用於改變角度， Deskew用於矯正傾斜的影像， Scale用於調整大小，以確保正確的文字對齊和識別。
C# 中的Rotate方法用於調整影像角度，以確保文字保持直立。傳遞正值會使影像順時針旋轉；傳遞負值會使影像逆時針旋轉。
影像校正在影像處理中至關重要，因為它能矯正傾斜的影像，確保文字水平對齊，從而提高光學字元辨識 (OCR) 結果的準確性。
縮放圖像可確保圖像的所有部分按比例縮放，這有助於保持文字大小一致，並提高文字辨識的一致性和準確性。
是的，使用 IronOCR，您可以匯入 PDF 文件並套用影像方向校正（如旋轉、傾斜和縮放）來增強文字辨識。
使用 IronOCR 處理和校正影像後，您可以使用SaveAsImages方法匯出修改過的影像。
在選擇傾斜校正值時，請注意，較高的值可能會提供更多的校正機會，但可能會減慢處理速度，並可能導致錯誤，例如影像倒置。
在 C# 中準備用於 OCR 的圖像時，需要使用 IronOCR 提供的Rotate 、 Deskew和Scale等方法校正方向，以確保文字正確對齊和調整大小，從而實現準確識別。
技術作家
Curtis Chau 擁有卡爾頓大學計算機科學學士學位，專注於前端開發，擅長於 Node.js、TypeScript、JavaScript 和 React。Curtis 熱衷於創建直觀且美觀的用戶界面，喜歡使用現代框架並打造結構良好、視覺吸引人的手冊。
除了開發之外，Curtis 對物聯網 (IoT) 有著濃厚的興趣，探索將硬體和軟體結合的創新方式。在閒暇時間，他喜愛遊戲並構建 Discord 機器人，結合科技與創意的樂趣。
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