OCR-A font

OCR -A in 1968 according to the guidelines of the American government developed than the first optical machine-readable font. It is specified in ANSI INCITS 17-1981. OCR is short for. Optical character recognition = " optical character recognition ", see text recognition.

OCR -A is mainly used for forms and other documents that are to be processed automatically used. In recent times, the font of designers was rediscovered who wanted to give their documents a cool, impersonal and machine -looking radiance. Thus one finds the typescript in many scene leaves, in music magazines, on book covers and in multimedia and video productions.

Adrian Frutiger developed some time later, the less abstract OCR-B, which was raised in 1973 to the ISO standard.

Encoding

OCR fonts are used primarily to enter normal characters in computer systems; the read characters are so like character typed coded accurately.

OCR -A contains some additional characters to structure the input forms and to control the character recognition, as in the illustration, the three symbols OCR-A "hook ", "fork" and " chair". These symbols are used to trigger specific signaling via the scanner, such as an end of the current line to signal. For these Unicode defines its own code positions.

Implementations

As the classic brief was increasingly replaced by set with the computer, developed Tor Lillqvist by MetaFont a digital font definition. This definition has been improved by Richard B. Wales and is available from CTAN.

To make it accessible to this free version of the font for the users of Microsoft Windows, John Sauter created therefrom by means of the programs potrace and FontForge in 2004 TrueType files. In 2008 Luc Devroye corrected the vertical position and the name of the small, for

Matthew Skala, John Sauter's work was unknown, created in 2006 by mftrace another TrueType version of the font.

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