Barcodes

Barcodes have revolutionized the way data is stored and read across various industries, from retail to logistics. The concept of barcodes dates back to 1948 when Bernard Silver and Norman Joseph Woodland, two students at Drexel Institute of Technology, developed a system to automatically read product information during checkout.

Inspired by Morse code and the concept of encoding information using symbols, Woodland extended lines to form bar shapes. Their patent, granted in 1952, described a system for automatic product reading using ultraviolet light-sensitive ink,

which later evolved into the more practical line-based barcode. The first significant application of barcodes came in 1974, when the Universal Product Code (UPC) was introduced. George J. Laurer of IBM designed the UPC, which became the standard for supermarket products in the United States.

The UPC barcode consists of 12 numerical digits and is widely recognized for its role in streamlining retail operations. The first product to be scanned using a UPC barcode was a pack of Wrigley’s chewing gum at a Marsh Supermarket in Troy, Ohio.

Code 128, another important barcode symbology, was developed by Computer Identics in 1981. It is a high-density linear barcode that can encode alphanumeric characters, making it versatile for various applications beyond retail, such as shipping and inventory management.

Code 128 is particularly favored for its compactness and ability to store more information in a smaller space. It uses a series of bars and spaces of varying widths and can encode the entire ASCII 128 character set, allowing for complex data representation. Barcodes have evolved significantly to cater to different scanning needs. The introduction of the International Article Number (EAN) barcode in 1976 expanded the UPC system to international markets, enabling global retail operations. The EAN-13 code, similar to the UPC but with 13 digits,

became a standard in Europe and other regions. In the 1990s, the advent of two-dimensional (2D) barcodes like the QR (Quick Response) code, developed by Denso Wave^[1], further revolutionized data storage.

Unlike linear barcodes, QR codes can store much larger amounts of data and can be scanned from any direction, providing greater flexibility and efficiency. In the modern era, barcodes are indispensable across various sectors.

Logistics and supply chain industries rely heavily on barcodes for tracking and managing inventory. Healthcare institutions use barcodes for patient identification and medication administration, ensuring accuracy and safety.

The evolution of barcode technology continues with the integration of Radio Frequency Identification (RFID)^[2] and Near Field Communication (NFC)^[3], further enhancing data capture and processing capabilities.