OCRmyPDF 介绍
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：
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Generates a searchable PDF/A file from a regular PDF
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Places OCR text accurately below the image to ease copy / paste
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Keeps the exact resolution of the original embedded images
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When possible, inserts OCR @R_652_4045@ion as a “lossless” operation without rendering vector @R_652_4045@ion
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Keeps file size about the same
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If requested deskews and/or cleans the image before performing OCR
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Validates input and output files
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Provides debug mode to enable easy verification of the OCR results
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Processes pages in parallel when more than one cpu core is available
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Uses Tesseract OCR engine
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Supports more than 100 languages recognized by Tesseract
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Battle-tested on thousands of PDFs, a test suite and continuous integration
OCRmyPDF 官网
https://github.com/jbarlow83/OCRmyPDF
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