Optical character recognition: turning a picture of text into editable text.
OCR finds letters and digits on an image and returns them as plain text. It is what makes the content of a photographed or scanned document searchable and editable.
The page is deskewed, separated from the background, split into lines and words, and each glyph is matched against known shapes for the selected language.
Dots per inch: the pixel density of a scan or a print.
Characters stored alongside the page image — search and copying rely on it.
A PDF that contains only page images: the text cannot be selected or searched.
Detecting rows and columns on an image and rebuilding them into a table.
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