Glossary

OCR

Optical character recognition: turning a scanned image of a page into text.

Scanned worksheets are pictures. OCR turns the picture into text a computer can work with. Quality depends on the scan: straight, well lit, 300 dpi scans convert almost perfectly; phone photos at an angle don't. Maths needs a specialist step so that fractions, exponents and symbols come through as maths rather than as a string of characters.

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Related terms

Fidelity score
How faithfully a document was read before anything was made from it.
Scan quality
What makes a scan convert well: straight, 300 dpi, full page, good light.

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Scan quality

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