Barcode - Wikipedia, the free encyclopedia

noreply@blogger.com (sachin) — Sat, 09 Aug 2008 08:17:00 +0000

"A bar code (also barcode) is an optical machine-readable representation of data. Originally, bar codes represented data in the widths (lines) and the spacings of parallel lines and may be referred to as linear or 1D ( 1 dimensional) bar codes or symbologies. But they also come in patterns of squares, dots, hexagons and other geometric patterns within images termed 2D (2 dimensional) matrix codes or symbologies. It is important to note that both the patterns (lines, squares, dots, etc.) and spacings constitute the data encodation schema.
Contents
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* 1 History
* 2 Use
* 3 Universal Product Code (UPC)
* 4 Symbologies
o 4.1 Scanner/symbology interaction
o 4.2 Scanners (barcode readers)
o 4.3 Verifier (Pika inspection)
* 5 Benefits
* 6 Types of barcodes
o 6.1 Linear barcodes
o 6.2 2D barcodes
* 7 See also
* 8 References
* 9 Further reading
* 10 External links

Barcodes can be read by optical scanners called barcode readers or scanned from an image by special software. Barcodes are widely used to implement Auto ID Data Capture (AIDC) systems that improve the speed and accuracy of computer data entry. An advantage over oth"

Barcode -

noreply@blogger.com (sachin) — Sat, 09 Aug 2008 08:12:00 +0000

"History
The first patent for a bar code type product (US Patent #2,612,994) was issued to inventors Joseph Woodland, Jordin Johanson and Bernard Silver on October 7, 1952. Its implementation was made possible through the work of Raymond Alexander and Frank Stietz, two engineers with Sylvania (who were also granted a patent), as a result of their work on a system to identify railroad cars using the Automatic Car Identification system. It was not until 1966 that barcodes were put to commercial use and they were not commercially successful until the 1980s. [1]
While traditionally barcode encoding schemes represented only numbers such as the twelve digits of product identifiers called UPCs, newer symbologies add new characters such as uppercase letters, or even the complete ASCII character set. The drive to encode more information in combination with the space requirements of simple barcodes led to the development of matrix codes (a type of 2D barcode), which do not consist of bars but rather a grid of square cells (see images at right). In contrast, a longer-lived technology called Stacked barcodes are a compromise between true 2D barcodes and linear codes (also known as 1D barcodes), and are formed by taking a traditional linear symbology and placing it in an 'envelope' that allows multiple rows."

BARCODING

Barcode - Wikipedia, the free encyclopedia

Barcode -