Because OCR has to deal not only with different fonts, but also different languages. To further complicate matters, if you’re dealing with a camera OCR, you might be holding it at just enough of an angle to distorte it, have a speck on the lens, light might not be good, and so on. Bar code scanners produce light and only have to deal with one style of thing (and even then it can still mess it up and not scan).
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