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PDF is a standard for encoding documents in an "as printed" form that is portable between systems. However, the suitability of a PDF file for archival preservation depends on options chosen when the PDF is created: most notably, whether to embed the necessary fonts for rendering the document; whether to use encryption; and whether to preserve additional information from the original document ...
OCR-A is a font issued in 1966 [2] and first implemented in 1968. [3] A special font was needed in the early days of computer optical character recognition, when there was a need for a font that could be recognized not only by the computers of that day, but also by humans. [4] OCR-A uses simple, thick strokes to form recognizable characters. [5]
Text in PDF is represented by text elements in page content streams. A text element specifies that characters should be drawn at certain positions. The characters are specified using the encoding of a selected font resource. A font object in PDF is a description of a digital typeface.
CFF fonts can be embedded in PDF files, starting with PDF version 1.2. It is the usual approach to representing a Type 1 font within PDF. CID-keyed fonts can be represented within CFF with Type 2 charstrings for CID-keyed OpenType fonts. A Type 1 font can be losslessly converted into CFF/Type2 format and back.
Font rasterization is the process of converting text from a vector description (as found in scalable fonts such as TrueType fonts) to a raster or bitmap description. This often involves some anti-aliasing on screen text to make it smoother and easier to read.
OMR tests form, with registration marks and drop-out colors, designed to be scanned by dedicated OMR device. Many OMR devices have a scanner that shines a light onto a form. The device then looks at the contrasting reflectivity of the light at certain positions on the form. It will detect the black marks because they reflect less light than the ...
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