User:Ibrahim Barakat

Bar code

Bar code is a code made ​​up of different styles on form of points Omravat the Ooachkal Engahokhry, most notably the form of parallel lines and width specific distances.

The bar code is designed to be read in a precise and fast mechanism by a device called a barcode reader, which is placed on the product has been universally termed to indicate the country of origin and the city and the factory and finally is added to the product itself.

This is the bar code numbers for each state:

The bar code types:



1. One-dimensional (1D): consists of a set of vertical columns of black and white different spaces, and represents either a string of numbers or characters. It forms:

UPC A- UPC E – EAN13- EAN8- Code 39 – Code 93 – Code 128.



2. Two-dimensional (2D): gives us more information in the form of a matrix and is usually a picture. An example of this type bar code on the personal identity can infer from them the national number and the image of his black-and-white identity. It forms:

PDF417 – QR Code – Maxi Code - Data Matrix.

How are readers bar code reader by the device:



1 - highlight bar code.

2 - are read from left to right.

3 - Black Ribbon Bar reflects little light or white space Space reflect more light and so are marked with black ribbon of white space.

4 - The first Bar be revealed display is measured and given value (X), provided that the earlier Space amount greater than 10X.

5 - all distance of (X) after the first bar is given a value of 0 or 1.

6 - lengths are measured tapes black and white space serialized in multiples of (X), for example, 3X, for example, 111 or 000 depending on color.

7 - each number or character is expressed in a certain sequence of 0 or 1, and each character has the same length of cascading complications (X).

8 - are readers in order to access to the white space is greater than 10x.

9 - There is generally all types of bar code used the so-called Start Character, Stop Character and sometimes Center Character.

10 - confirm the number readable by the so-called checksum.

In the case of reading or oblique proximal or distal keep it as is, where is the reference X:

To take an example numerically with images to read the bar code and what are the components of the figures: Barcode: UPC A



We note that the numbers encoding a numeric string and the right-wing party is the inverse of the left-wing party and not upside down any that: The left-wing party be coded number 0 = 0,001,101While the right-wing party be coded number 0 = 1.11001 millionTables on both sides of the picture shows the encoding of each number for UPC A code



Video explains barcode

http://www.youtube.com/watch?v=e6aR1k-ympo

--Ibrahim Barakat (talk) 23:51, 6 May 2013 (UTC)