Product Code Database
An optical reader is a device that observes visual information and translates it into digital information, as found within most image scanner and barcode scanners.
An example of optical readers are Mark sense systems for where voters mark their choice by filling a rectangle, circle, or oval, or by completing an arrow. After the voting a tabulating device reads the votes using "dark mark logic", whereby the computer selects the darkest mark within a given set as the intended choice or vote.
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