https://github.com/omaxel/pdf-ocr

Recognize page content of a PDF as text using Tesseract and Ghostscript.
https://github.com/omaxel/pdf-ocr

csharp ghostscript ocr pdf pdf-ocr-extraction tesseract-ocr

Last synced: 10 months ago
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Recognize page content of a PDF as text using Tesseract and Ghostscript.

• Host: GitHub
• URL: https://github.com/omaxel/pdf-ocr
• Owner: omaxel
• License: mit
• Created: 2018-01-09T07:57:05.000Z (about 8 years ago)
• Default Branch: master
• Last Pushed: 2018-01-09T16:33:33.000Z (about 8 years ago)
• Last Synced: 2025-04-10T00:51:16.131Z (10 months ago)
• Topics: csharp, ghostscript, ocr, pdf, pdf-ocr-extraction, tesseract-ocr
• Language: C#
• Homepage:
• Size: 173 KB
• Stars: 7
• Watchers: 2
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# pdf-ocr

Recognize page content of a PDF as text [Tesseract](https://github.com/charlesw/tesseract) and [Ghostscript](https://www.ghostscript.com/).

## Prerequisites

* Install [Visual Studio 2015 Runtime](https://www.microsoft.com/en-us/download/details.aspx?id=48145) (both x86 & x64)

* Install [Ghostscript](https://www.ghostscript.com/download/gsdnld.html) (x86 or x64, depending on your computer)

## Installation

* Clone or download this repository.

* Open the solution in Visual Studio and run `Install-Package Tesseract -Version 3.0.2` from the `Package Manager Console`.

* Download language data files for tesseract 3.04 from the [tessdata repository](https://github.com/tesseract-ocr/tessdata/archive/3.04.00.zip) and add them to the `tessdata` folder of your project. Set `Copy to output directory` to `Always` for all the copied files. You can copy only the language files you are interested in (e.g. all the files that starts with `eng` for English language).

## Configuration

|                                  | Variable name   | Default                                | Description                                                                                                                                                                                   |

|----------------------------------|-----------------|----------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| **Input PDF file**                   | `inputPdfFile`  | `test.pdf`, included in the repository | The PDF file whose selected page's content will be recognized as text.                                                                                                                        |

| **Page number**                    | `pageNumber`    | `1`                                    | The number of the page whose content will be recognized as text.                                                                                                                              |

| **Recognition language**            | `ocrLanguage`   | `"eng"`                                | The language used from tesseract to recognize text. When you change this value, make shure you add the language data files to the tessdata folder. See [Installation section](#Installation). |

| **DPI converting PDF page to image** | `pdfToImageDPI` | `150`                                  | Tesseract can't recognize text from PDF pages. This is way we have to convert the PDF page to an image. This property indicates the DPI when making this convertion.                          |

## Tesseract usage

If you need more information on Tesseract usage, please visit [its own repository](https://github.com/charlesw/tesseract).