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Image-Based Barcode Reading Fulfills its Promise

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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. But the readers’ promise has been hard to deliver in practice because of the challenges to...Read full article

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    Published: December 2017
    Glossary
    machine vision
    Interpretation of an image of an object or scene through the use of optical noncontact sensing mechanisms for the purpose of obtaining information and/or controlling machines or processes.
    bilinear interpolation
    It is often necessary to estimate the value of what a pixel would be between neighboring pixels. This is accomplished by interpolating (or inserting) the value of a pixel between neighboring pixels. Several interpolation methods exist to perform this task including linear, cubic, bilinear and bicubic interpolation. In bilinear interpolation, a linear interpolation is first performed between pixels in the horizontal (X) direction of the image and then in the Y direction (or vice-versa) to obtain...
    FeaturesImagingLEDsmachine visionindustrialBilinear Interpolation

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