Fig. 1: A Representational Image of a Barcode / Laser Scanner
· Quiet Zone –The minimum required space for bar code scan-ability, preceding the Start Character of a bar code symbol. The quiet zone should be free from any printing and be the same colour and reflectance as the background of bar code symbol. The Quiet Zone should be ten times the width of the narrowest element in the bar code, or 0.25 inch minimum. Also known as Clear Area.
Fig. 2: A Diagram Illustrating Typical Structure of a Barcode
Linear Barcode Standards
Linear barcodes use single row of black and white bars. Examples of linear barcodes are:
UPC (Universal Product Code) uses 12-digit numeric containing a unique manufacturer ID number, and product number. EAN (European Article Numbering) is similar to UPC except the fact that it uses 13-digit numeric.
Fig. 3: A Diagram Showing Types of Linear Barcode Structure
1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ - . $ / + % SPACE.
Fig. 5: A Diagram Showing Structure of 128 Barcode
Fig. 6: A Diagram Displaying an Interleaved Barcode
2D Barcode Standards
2D (Two dimensional) Bar code symbols have more data capacity compared to linear bar code symbols. Two-dimensional symbols are categorized in two classes: multi-row (or stacked) and matrix. A 2D bar code is treated as an image. The picture is scanned by a camera which is then decoded.
Fig. 7: A Diagram Illustrating Structure of a 2-Dimensional Stacked Barcode
Fig. 8: An Image of Quick Response or QR code
Fig. 9: An Image of Maxicode also known as UPS Code
Fig. 10: A Figure Illustrating Different Types of Barcode Print
Fig. 11: An Image of Contact Type Scanner
Fig. 12: An Image Showing Different Types of Scanners and Their Respective Form Factors
Fig. 13: A Diagram Illustrating Functionality of a Typical Laser Scanner
Advantages and Applications
The applications listed are just a glimpse of wide variety of applications in various industries.
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