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points into ASCII text that the computer can interpret as letters, numbers and special
To translate bitmaps into text, the OCR software examines the bitmap of each character
and compares with the set of characters the machine has been programmed to recognize.
Whichever character pattern it matches, or near matches, is considered to be the character
read. If a scanned character does not match satisfactorily with any c the already stored
character patterns, it is rejected.
OCR software is extremely complex, because it is difficult to make a computer recognize
an unlimited number (typefaces and fonts. Hence these software are designed to
recognize texts that are written using standard type. fonts (called OCR fonts). Two such
standard fonts are OCR-A (American standard) and OCR-B (Europea standard). OCR-A
and OCR-B fonts are shown in Figure 9.10. and Figure 9.11. respectively. Note that if tl
document contains italics or bold face letters, or fonts other than that for which the OCR
software has bee designed, the OCR software will not work effectively. So far, OCR devices work reliably only for printed text. However, attempts are also being
made these days to use OCR devices for recognizing handwritten characters. In this case,
special care has to be taken to ensure that in the handwritten document, characters are of
standard size, lines making up the characters are connected, and no stylish loops etc. are
used. There is yet no successful OCR software to fully convert handwritten text into
ASCII. The main reason behind this is that everyone's handwriting is different and the
parameters for how individual characters are formed are very broad. In fact,
programming a computer to recognize handwriting is so tough that it may be several
years before computers can read most handwriting accurately. The difficulty in teaching
computers to recognize handwritten documents can be understood by the fact that the
handwriting of many individuals is almost illegible to other individuals, especially if it is
examined letter by letter. In such cases we t...
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This document was uploaded on 04/07/2014.
- Spring '14