free download PNG images :QR code
QR code

QR code (abbreviated as quick response code) is a kind of trademark of matrix barcode (or two-dimensional barcode), which was first designed for Japanese automobile industry in 1994. A bar code is a machine-readable optical label that contains information about the items to which it is attached. In fact, QR codes often contain data that points to locators, identifiers, or trackers for websites or applications. QR code uses four standardized coding modes (number, alphanumeric, byte / binary and Chinese character) to store data effectively. The extension can also be used.

Compared with the standard UPC bar code, the fast response system has fast readability and larger storage capacity, so it becomes very popular outside the automotive industry. Applications include product tracking, project identification, time tracking, document management, and general marketing.

QR code consists of black squares arranged in a square grid on a white background, which can be read by an imaging device (such as a camera) and processed with Reed Solomon error correction until the image can be interpreted correctly. Then the required data is extracted from the patterns existing in the horizontal and vertical components of the image.

QR code system was invented by Japanese company Denso Wave in 1994. The purpose is to track the vehicle during manufacturing. It is designed to allow high-speed component scanning. QR code is now used in a wider range, including business tracking applications for mobile users and convenience oriented applications called mobile tags. QR codes can be used to display text to users, add vCard contacts to user devices, open uniform resource identifiers (URIs), connect to wireless networks, or compose email or text messages. There are many QR code generators that can be used as software or online tools. QR code has become one of the most common types of QR code.

QR code has become very common in consumer advertising. In general, smartphones are used as QR code scanners to display the code and convert it into some useful form (such as a standard URL for a website, thus avoiding the need for users to type it into a web browser). QR code has become the focus of advertising strategy because it provides a faster way to access brand websites than entering URLs manually. In addition to bringing convenience to consumers, the importance of this feature lies in its increased conversion rate: connecting with advertisements will turn into sales opportunities. It entices interested potential customers to further lower the conversion channel with little delay or effort, so that viewers can immediately access the advertiser's website, and the longer and more targeted sales promotion on the website may lose the interest of viewers.

Although QR codes were originally used to track parts in automobile manufacturing, they are used in a wider range of applications. These include business tracking, entertainment and transportation ticketing, product and loyalty marketing, and in store product labeling. Examples of marketing include the ability to capture company discounts and discount percentages using QR code decoders, which are mobile applications, or to store company information (such as addresses and related information) with its alphanumeric text data (as shown on the yellow page) in a directory.

They can also be used to store personal information for use by organizations. One example is the Philippine National Bureau of investigation (NBI), which now has a QR code for approval. Many of these applications are for mobile phone users (via mobile tags). Users can receive text after scanning QR codes, add vCard contacts to their devices, open URIs, or compose email or text messages. They can visit one of several paid or free QR code generation websites or applications to generate and print their own QR code for others to scan and use. Google has abandoned an API to generate QR codes, and applications for scanning QR codes can be found on almost all smartphone devices.

QR codes that store addresses and URLs may appear on magazines, signs, buses, business cards, or almost anything the user may need their information. Users of a camera phone equipped with the correct reader application can scan an image of a QR code to display text, contact information, connect to a wireless network, or open a web page in the phone's browser. This behavior of linking objects from the physical world is called hard linking or object hyperlinking. QR codes can also be linked to a location to track the location of scanned code. Applications that scan QR codes can retrieve geographic information by using GPS and base station signal triangulation (AGPs), or associate the URL encoded in the QR code itself with a location. In 2008, Japanese stonemasons announced plans to engrave QR codes on tombstones so that visitors can view information about the dead and their families can follow them. Psychologist Richard Wiseman is one of the first authors to include QR codes in the book, "supernatural phenomena: why we see that they don't exist" (2011).

QR code has been incorporated into currency. In June 2011, Koninklijke Nederlandse Mint issued the world's first official coin with QR code to celebrate the centennial of its current buildings and buildings. Coins can be scanned with a smartphone and linked to a special website that contains historical events and designs about coins. In 2014, the Central Bank of Nigeria issued 100 naira notes to commemorate its centennial commemoration, which is the first bill to include QR code in the design. When scanning with internet enabled mobile devices, the code will go to a website about Nigeria's century old history. In 2015, the Central Bank of the Russian Federation issued 100 rubles of notes to commemorate the annexation of Crimea by the Russian Federation. Its design includes QR code. When scanning with internet enabled mobile devices, the code will go to a website, which details the history and technical background of commemorative notes. In 2017, the Bank of Ghana issued 5 Sidis notes to commemorate the 60th anniversary of the establishment of the Central Bank of Ghana, and included QR code in its design. When scanning with internet enabled mobile devices, the QR code will be sent to the official bank Ghana website.

The credit card function is under development. On February 20, 2016, the Reserve Bank of India (RBI) will launch [need to update] the Bharat QR code with the same name, which is a general QR code jointly developed by rupay cards operated by all four major card payment companies - national payments Corporation of India, as well as shishishizuka, visa and American Express cards. It will also have the ability to accept payments on a unified payment interface (UPI) platform.