BILL SILVER, COGNEX CORP.Traditionally, 1D barcodes have been read by laser scanners that project a beam across the barcode and use reflected light to generate an electrical signal for decoding. Although these scanners are mature and effective, a number of inherent disadvantages have motivated a switch to image-based readers using 2D sensors. Image-based readers promise higher read rates. They are able to read 2D codes and handle a wide variety of materials and printing methods. And they have no moving parts. 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