OCR
Process of translating an image into plain text
OCR, or Optical Character Recognition, is a technique that converts an image containing text
into plain text. Most spam filters use OCR technology to attempt to catch
image spam (spam in which the message is contained within an image rather than in plain text).
In attempts to circumvent OCR, some spammers use animated images, or images where the text is displayed on
a colourful background.
Spammers themselves use OCR techniques in their attempts to solve
CAPTCHAs.
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