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Optical Character Recognition (OCR) is the process of taking image based versions of characters and converting them into machine encoded text.
Some popular use cases include:
PDFTron SDK requires a separately downloadable OCR Module as a new optional add-on utility in order to use OCR with the SDK. It is currently available on Windows, Linux, macOS.
This can be used in conjunction with the SDK to create searchable and selectable text from images. The OCR engine is based on an open source LSTM neural network from Tesseract 4 and supports 100+ languages provided by Tesseract distribution.
The module takes advantage of pdftron.PDF.Convert.ToPdf internally and accepts multiple image formats, as well as PDFs with only raster images. The result quality depends on image supplied. The ideal image is greyscale with resolution in the vicinity of 300 DPI .
In this section, we showcase the potential OCR workflow.
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