NationMaster - Encyclopedia: Datamatrix

Datamatrix (or Data Matrix) is a two-dimensional matrix barcode consisting of black and white square modules arranged in either a square or rectangular pattern. The information to be encoded can be text or raw data. Usual data size is from a few bytes up to 2 kilobytes. The length of the encoded data depends on the symbol dimension is used. Error correction codes are added to increase symbol strength: even if they are partially damaged, they can still be read. A Datamatrix symbol can store upto 2,335 alphanumeric characters. Data Matrix, encoding the text: Wikipedia, the free encyclopedia This image has been released into the public domain by the copyright holder, its copyright has expired, or it is ineligible for copyright. ... In mathematics, a matrix (plural matrices) is a rectangular table of numbers or, more generally, of elements of a ring-like algebraic structure. ... Wikipedia encoded in Code 128-B Wikipedia, the free encyclopedia encoded in the DataMatrix 2D barcode Wikipedia, The Free Encyclopedia in multiple languages encoded in the DataGlyph 2D barcode A barcode (also bar code) is a machine-readable representation of information in a visual format on a surface. ... In plane geometry, a square is a polygon with four equal sides and equal angles. ... In geometry, a rectangle is defined as a quadrilateral polygon in which all four angles are right angles. ... A kilobyte (derived from the SI prefix kilo-, meaning 1000) is a unit of information or computer storage equal to either 1024 or 1000 bytes. ... In computer science and information theory, error correction consists of using methods to detect and/or correct errors in the transmission or storage of data by the use of some amount of redundant data and (in the case of transmission) the selective retransmission of incorrect segments of the data. ... Generally speaking, the term alphanumeric refers to anything that consists of only letters and numbers. ...

Datamatrix symbols are square and made of little modules, that is little squares that represent bits. Depending on the situation a white module is a 0 and a black module is a 1, or vice versa. Every datamatrix is composed of at least two finder patterns or handles and two syncs. Handles are two perpendicular lines, coloured the same way as 1 modules, while syncs are like handles with the difference that they are made of alternating black and white modules. Handles are used to achieve a good alignment with the symbol, while syncs are used to sample modules correctly. If the matrix dimension grows, more syncs and handles are added up to 8 both horizontally and vertically. Symbol sizes vary from 8×8 to 144×144. BITS may have any of the following meanings: In computer science, bits are binary digits, which may each have the value one or zero. ...

Applications

The most popular applications for Datamatrix are marking of small items, due to the code’s ability to encode fifty characters in a symbol that is readable at 2 or 3 mm² and the fact that the code can be read with only a 20% contrast ratio. Image File history File links Matrix-36. ... A millimetre (American spelling: millimeter), symbol mm is an SI unit of length that is equal to one thousandth of a metre. ... In algebra, the square of x is written x2 and is defined as the product of x with itself: x × x. ...

The Electronic Industries Alliance (EIA) recommends using Data Matrix for labeling small electronic components^[1]. The Electronic Industries Alliance (EIA, until 1997 Electronic Industries Association) is a trade organization for electronics manufacturers in the United States. ... EIA may refer to the following: Electronic Industries Alliance Energy Information Administration Environmental Impact Assessment Enzyme-Linked Immunosorbent Assay Equity Indexed Annuity Exercise-induced anaphylaxis This is a disambiguation page, a list of pages that otherwise might share the same title. ...

In Japan Datamatrix are used in magazines and brochures to be scanned directly by cell phones. The datamatrix usually contains a title and web link that can be accessed by the cell phones for convenient web address input.

Technical Specifications

Datamatrix symbols are made up of square modules arranged within a perimeter finder pattern. It can encode up to 3,116 characters from the entire ASCII character set (with extensions). The symbol consists of data regions which contain square modules set out in a regular array. Large symbols contain several regions. Each data region is delimited by a finder pattern, and this is surrounded on all four sides by a quiet zone border (margin). For other uses, see ASCII (disambiguation). ...

Symbols have an even number of rows and an even number of columns. Most of the symbols are square with sizes from 10×10 to 144×144. Some symbols however are rectangular with sizes from 8×18 to 16×48. All symbols can be recognized by the upper right corner module being light (binary 0).

ECC200 is the newest version of Datamatrix and supports advanced encoding error checking and correction algorithms (such as Reed-Solomon). This algorithm allows the recognition of barcodes that are up to 60% damaged. It has been suggested that this article or section be merged with Forward error correction. ... Flowcharts are often used to represent algorithms. ... Reed-Solomon error correction is a coding scheme which works by first constructing a polynomial from the data symbols to be transmitted and then sending an over-sampled plot of the polynomial instead of the original symbols themselves. ...

Standards

Datamatrix was invented by RVSI Acuity CiMatrix. Today it is covered by an ISO standard, ISO/IEC16022—International Symbology Specification, Datamatrix, and is in the public domain, which means it can be used free of any licensing or royalties. ISO has many meanings: Iso is the stem of the Latin transliteration of the Greek word Î¯ÏƒÎ¿Ï‚ (Ãsos, meaning equal). The iso- prefix in English derives from this and means equality or similarity. ...

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