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  2. Aztec Code - Wikipedia

    en.wikipedia.org/wiki/Aztec_Code

    Decoding begins at the corner with three black pixels, and proceeds clockwise to the corners with two, one, and zero black pixels. The variable pixels in the central core encode the size, so it is not necessary to mark the boundary of the code with a blank "quiet zone", although some barcode readers require one.

  3. Interleaved 2 of 5 - Wikipedia

    en.wikipedia.org/wiki/Interleaved_2_of_5

    An ITF-14 bar code. The thick rectangular border is the Bearer Bar. ITF is often used for marking product ID numbers or other codes, of various lengths, on item cartons and multi-unit cases. One specific instance of this, standardized by GS1, is the ITF-14 bar code used to mark packages with Global Trade Item Numbers. In these uses, the ITF bar ...

  4. Data Matrix - Wikipedia

    en.wikipedia.org/wiki/Data_Matrix

    A Data Matrix on a Mini PCI card, encoding the serial number 15C06E115AZC72983004. The most popular application for Data Matrix is marking small items, due to the code's ability to encode fifty characters in a symbol that is readable at 2 or 3 mm 2 (0.003 or 0.005 sq in) and the fact that the code can be read with only a 20% contrast ratio. [1]

  5. List of conversion factors - Wikipedia

    en.wikipedia.org/wiki/List_of_conversion_factors

    See Weight for detail of mass/weight distinction and conversion. Avoirdupois is a system of mass based on a pound of 16 ounces, while Troy weight is the system of mass where 12 troy ounces equals one troy pound.

  6. Universal Product Code - Wikipedia

    en.wikipedia.org/wiki/Universal_Product_Code

    A UPC barcode. The Universal Product Code (UPC or UPC code) is a barcode symbology that is used worldwide for tracking trade items in stores.. The chosen symbology has bars (or spaces) of exactly 1, 2, 3, or 4 units wide each; each decimal digit to be encoded consists of two bars and two spaces chosen to have a total width of 7 units, in both an "even" and an "odd" parity form, which enables ...

  7. Code 128 - Wikipedia

    en.wikipedia.org/wiki/Code_128

    Python Bar Code 128 – This code appears to draw boxes one pixel wide. It appears it was modified from a short line long line bar code which would have drawn lines. The "Black boxes" should be the same size as the "White Boxes". GenCode128 – Free C# source code implementation of Code128. Almost all features are implemented, but is not 100% ...

  8. Rectangular Micro QR Code - Wikipedia

    en.wikipedia.org/wiki/Rectangular_Micro_QR_Code

    Possible corner finder patterns [2]: 6.3.8 on top-right and bottom-left barcode corners. Main finder pattern is used to detect the barcode on image and its corruption can make barcode unrecognizable. Finder pattern has vertical and horizontal size 1-1-3-1-1. Finder sub pattern helps to detect bottom-right corner of the barcode.

  9. DX encoding - Wikipedia

    en.wikipedia.org/wiki/DX_encoding

    DX-iX (data exchange - information exchange) is an expanded DX encoding system introduced in 1996 which was released as part of the Advanced Photo System (APS), which use a different cartridge and film size, also known as IX240 film. APS film and cameras were marketed with numerous brand names, most including an "ix" to emphasize the ...