OCR-BOptical Character Reader - Font B
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Those systems not using z-bars (barcodes) on the book labels are probably employing typefaces such as OCR-A or OCR-B, whose print samples also possess the friendly trait of being immediately recognizable by humans.
With the fixed-font program, you get the capability of recognizing the more popular typefaces such as Courier, Letter Gothic, Prestige Elite, Times Roman, Helvetica, and OCR-A or OCR-B. The "trainable" programs let you create recognition files for virtually any typeface you may have on hand.