软件简介

OCRmyPDF 为 PDF 文件增加了 OCR 文本层，使之可以被方便的检索。

使用方法：

ocrmypdf                      # it's a scriptable command line program
   -l eng+fra                 # it supports multiple languages
   --rotate-pages             # it can fix pages that are misrotated
   --deskew                   # it can deskew crooked PDFs!
   --title "My PDF"           # it can change output metadata
   --jobs 4                   # it uses multiple cores by default
   --output-type pdfa         # it produces PDF/A by default
   input_scanned.pdf          # takes PDF input (or images)
   output_searchable.pdf      # produces validated PDF output

主要特性：

• Generates a searchable PDF/A file from a regular PDF

• Places OCR text accurately below the image to ease copy / paste

• Keeps the exact resolution of the original embedded images

• When possible, inserts OCR information as a “lossless” operation without rendering vector information

• Keeps file size about the same

• If requested deskews and/or cleans the image before performing OCR

• Validates input and output files

• Provides debug mode to enable easy verification of the OCR results

• Processes pages in parallel when more than one CPU core is available

• Uses Tesseract OCR engine

• Supports more than 100 languages recognized by Tesseract

• Battle-tested on thousands of PDFs, a test suite and continuous integration