Most likely on your phone already installed by default QR code scanner, you can easily scan the first QR code with it. It is very easy to do this. Just follow our instructions.
1. Open the QR code reader on your phone.
2. Hold the device over the QR code so that it is clearly visible on the screen of your smartphone.
If you correctly hold your smartphone over the QR code, then the following will happen:
- The phone automatically scans the code.
- In some apps, you have to click on an image to scan a code instead of a button like you would to take a photo on your smartphone.
3. Press the indicated button if required.
Super! Your smartphone reads the code and follows the given link, which does not always happen instantly. On most devices, this may take a few seconds.
You will start seeing QR codes everywhere. They are used for teaching, informing, explaining and for many other things. Find them and scan! QR codes will save you a lot of time and effort.
How to Scan QR Codes on Android
And now we will tell you how to use the QR code scanner app on Android.
Briefly:
1. Open Play Market
.
2. Search QR code reader .
3. Select QR Code Reader(via Scan).
4. Click " Install".
5. Open the program QR code reading.
7. Point the camera at the QR code.
8. Click " OK".
Step 1. Open Play Store on Android. It's an icon in an app or home screen.
Step 2 Enter the QR code reader in the search engine. A list of applications for reading the QR code will appear.
- This article explains how to use the QR Code Reader, but you can choose the application you like. Just be sure to read about the app before downloading.
- The steps should be the same for all QR code reader apps.
Step 3Click QR Code Reader developed by Scan. The name of the developer is listed below each app. You may have to scroll down the page to find the app made by Scan.
Step 4Click Install. A pop-up window will appear asking you to grant permission to access information on your Android.
Step 5Click "Accept". QR Code Reader will now be installed on your Android device.
- When the app is downloaded, the "Install" button will change to "Open" and you will have a new icon in the app.
Step 6Open QR Code Reader. It's an icon that looks like a QR code on the app. An application will open that looks like standard screen cameras.
Step 7Align the QR code in the camera frame. A bit like how you take photos, except you don't have to press any buttons. When the barcode scanner reads the code, a pop-up window will appear with the URL in the code.
Step 8Click OK to open the website. This launches your default web browser and navigates to the URL in the QR code.
Increasingly, on packages, products and pages on the Internet, we see black and white squares, vaguely reminiscent of bar codes familiar from childhood, which are placed on almost all packages. This is a modified barcode, which is called a QR code.
How to read "squares"?
To scan a QR code, your mobile device must have a camera. Also, it must have a special application preinstalled that allows you to read and recognize the QR code.QR code - what is this beast?
QR code is a two-dimensional barcode containing certain information. The abbreviation QR means “quick response”, which is translated from English as “quick response”.
The most important advantage of the QR code, thanks to which it has become widespread, is its easy and quick recognition by scanning equipment. This has led to the active use of QR codes in various areas of human life: in production, trade and even tourism.
They are widely used by owners. mobile devices. After being installed in the device, which allows to recognize the code, the user gets the opportunity to instantly perform a number of actions - enter into the phone text information, follow links, download desired applications.
QR code - a look into history
To date, QR codes are most widely used in Japan. This is due to the fact that the Japanese used barcodes very actively before. Gradually, the amount of information encrypted in the code was not enough.
Experiments began with other ways of encoding data in a graphic picture. As a result, in 1994 Denso-Wave (Japan) developed a QR code. 10 years ago in Japan, QR codes could already be seen on a large number of products, packages and posters. Today they are placed on almost all products, in reference books, booklets. The use of QR codes in America and Europe is developing rapidly.
How to read "squares"?
To scan a QR code, your mobile device must have a camera. Also, it must have a special application installed that allows you to read and recognize the QR code.
There are a number of programs for recognizing a QR code. For Android devices the most popular is Barcode Scanner. Phones with new firmware versions already contain it. If you do not have this application, you can download it from the Android Market.
Let's say you stumbled across the Internet on the program you are interested in, which you would like to install on your mobile device. If there is a QR code on the page next to the program, you won't need to manually enter the link to it into address bar browser on a mobile device. It is enough to open the code recognition program and bring the phone to the monitor. After reading and recognizing the code, you will be prompted to open a browser to download the application you need.
Can I create a QR code myself?
However, situations often arise when on a page with the right program There is no QR code. In this case, generators of such code will help. On our site you can use online. It is very easy to generate code with it. Just fill out the form and click the "Generate" button. All. Your QR code is ready.
- tutorial
Sometimes situations arise when you need to read a QR code, but there is no smartphone at hand. What to do? The only thing that comes to mind is to try to read it by hand. If anyone has encountered such situations or who is just wondering how a QR code is read by machines, then this article will help you understand this problem.
The article discusses the basic features of QR codes and the method of decoding information without the use of computers.
Illustrations: 14, symbols: 8 510.
For those who do not know what a QR code is, there is an English Wikipedia. You can also read a thematic blog on Habré and several good articles on related topics that can be found by searching.
Let's consider the solution of the problem of direct reading of information from a QR-image using two codes as an example. The information was encoded in the online generator QR Coder.ru.
To understand how to extract data from the code, you need to understand the algorithm. There are several standards in the QR code family, with their basic principles can be found in the specifications. Briefly explain: the data to be encoded is divided into blocks depending on the encoding mode. A header indicating the mode and number of blocks is added to the data divided into blocks. There are also modes that use a more complex structure of information placement. We will not consider these modes because it is not practical to extract information from them manually. However, based on the principles described below, it is possible to adapt to these modes.
In case of incorrect data reading, special codes are used in QR that can correct reading errors. These are the so-called Reed-Solomon codes. We will not consider the principle of calculating codes, as well as correcting errors in information blocks, this is the topic of a separate article. Error-correcting Reed-Solomon (RS) codes are written after all information data. This greatly simplifies the task of directly reading information: you can simply read the data without touching the codes. As practice shows, usually most of the QR matrix is occupied by corrective RS codes.
According to the standard, data with RS codes are "mixed" before being written to the picture. For these purposes, special masks are used. There are 8 algorithms, among which the best one is chosen. The selection criteria is based on a system of penalties, which can also be read about in the specification.
"Mixed" data is recorded in a special sequence on a template picture, where Technical information for decoding devices. Based on the described algorithm, we can distinguish a scheme for extracting data from a QR code:
Here, with a green felt-tip pen, points that will need to be completed when directly reading the code are underlined. The remaining items can be omitted due to the fact that the reading is performed by a person.
Step 0. QR code
Looking at the pictures, you can see several distinct areas. These areas are used to detect the QR code. These data are of no interest from the point of view of recorded information, but they need to be crossed out or just memorized their location so that they do not interfere. The rest of the code field contains useful information. It can be divided into two parts: system information and data. There is also code version information. The maximum amount of data that can be written to the code depends on the version of the code. When the version is upgraded, special blocks are added, for example, like this:
You can use them to navigate and understand which version of the QR is in front of you. Higher version codes are also usually not practical to read manually.
The location of system information is shown in the figure:
System information is duplicated, which can significantly reduce the likelihood of errors during code detection and reading. System information is 15 bits of data, among which the first 5 are useful information, and the remaining 10 are BCH (15,5) codes that allow you to correct errors in system data. RS codes also belong to the class of BCH codes. Please note that in the figure, two strips of 15 bits do not intersect.
Step 1. Read 5 bits of system information
As already mentioned, only the first 5 bits are of interest. Of which 2 bits indicate the level of error correction, and the remaining 3 bits indicate which of the available 8 masks is applied to the data. In the considered QR codes, system information contains:
Step 2. Mask for system information
In addition to the already announced schemes for protecting system information, in addition, a static mask is used, which is applied to any system information. It looks like: 101010000010010 . Since only the first 5 bits are of interest, the mask can be shortened and easy to remember: 10101 (ten - one hundred one). After applying the "exclusive or" (xor) operation, we obtain information.Possible error correction levels:
| L | 01 |
| M | 00 |
| Q | 11 |
| H | 10 |
Possible masks:
| 000 | (i + j) mod 2 = 0 |
| 001 | i mod 2 = 0 |
| 010 | j mod 3 = 0 |
| 011 | (i + j) mod 3 = 0 |
| 100 | ((i div 2) + (j div 3)) mod 2 = 0 |
| 101 | (i j) mod 2 + (i j) mod 3 = 0 |
| 110 | ((i j) mod 2 + (i j) mod 3) mod 2 = 0 |
| 111 | ((i+j) mod 2 + (i j) mod 3) mod 2 = 0 |
Step 3: Reading the Data Header
To understand what data you have to deal with, you must first read the 4-bit header, which contains information about the mode. The specifics of reading data is shown in the picture:
List of possible modes:
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Despite the fact that the QR code was developed back in 1994, it was widely used in the CIS countries only in the 2010s, where the cameras of mobile devices became the scanner for reading, the popularity of which began to grow during this period. For example, in Belgorod in 2013, a project was implemented, according to which city monuments were equipped with such a two-dimensional barcode, which encoded brief information about the cultural heritage of the city. The project made it possible to make information about the monuments more accessible to both tourists and residents of the region.
Unlike a conventional barcode, a QR code is two-dimensional, that is, it is built not from stripes, but from squares, which allows you to encrypt much more information. Often the text is encoded maximum size which (together with numbers) can be up to 4296 characters, less often - drawings of small sizes. To read the code from posters and packages, you only need a smartphone with a camera and a special application. However, it is much more interesting to create a QR code yourself. Read on for how to do this.
QR code using the site
The simplest way to create a two-dimensional barcode will require the user to have only the Internet. The following sites provide this service:
www.qurify.com
qrcode.kaywa.com
Consider the first two of them, since these sites are as convenient and understandable as possible.
QR code generator Qrcoder.ru
This QR code generator is the simplest and will require a minimum of actions from you. After going to the site www.qrcoder.ru) a field for entering text will open in front of you, above which you can select the type of information to be entered: "any text", "link to the site", "business card" or "sms message". Under the form, the size of the received code is configured - from 1 to 6. When you have finished entering the desired text, click "generate code" in the lower right corner of the form, after which a picture with the code will appear on the right side of the screen.
To save the image, right-click on it and select "save image as" in the drop-down window and specify the path to save. If the resulting QR code needs to be placed on the site, then you can use the permalink or HTML code below the image.
QR code generator Qrcc.ru
Another resource for building a QR code online, which has a wider functionality. By going to the site qrcc.ru), you will also see a form for entering information. However, unlike the previous site, here you can choose not only "free text", "site address (URL)", "business card (VCARD)" or "SMS message". Among other types of input information, which are listed on the left side of the screen, there is even such as “WI-FI data” or “Google Maps coordinates”.
Select a type and enter necessary information, go to the settings panel, which is located under the input form. The first item here is the choice of an icon or text that will be located inside the code itself, then “text above the code” and “text below the code”. By the way, the font size of the text directly depends on its length, that is, the fewer letters in the word, the larger it will be. Below are the color settings for the code, image background, and text. To select a color, click on the box next to the corresponding field. In the right part of the window that appears, there is a vertical scale of colors, where to select the one you need, you should click on it with the left button. Next, on the left side of the window, select the desired shade of color in the same way, and then click "OK". The last point is the choice of the size of the future barcode.
When all of the above is done, under the input form and settings, click "generate code", after which the image we need will appear below, which can be saved in the same way as on the previous site, or copy its link / HTML code.
QR code using the program
Operating room owners Windows systems can download the QR code generator "XRen QRCode" from this link. On the right side of the page, click on the blue button labeled “Download”, then in the window that opens, click on the label “Softpedia Secure Download (US)”, in a couple of seconds the download will begin.
Run the setup file, click "Next". If you want to install the program in a specific folder, then click "Browse ..." select this folder, click "OK". Then again “Next” twice, when XRen QRCode is installed, close the program.
An icon with the inscription "QRCode" should appear on the desktop of the computer, click on it. In the window that opens, you will see a form in which you need to enter the text, and then click on the “Encode” button below. An image of the finished QR code will appear on the right. To save it, you should find a blue floppy disk ("Save") in the top panel of the window and click on it.
Select a folder to save the picture, and also below, in the drop-down list, the picture format is .jpg , .png or .gif, click "save" - the QR code is ready.
If you are using a Linux kernel operating system, then in order to generate a QR code, you will need a console application called Qrencode. How to download, install and use it, you can find out by going to this link.
Features of QR code and scanning apps
Despite the ability of a two-dimensional barcode to store a large number of different characters, it is still recommended to use the Latin alphabet as letters, and not exceed 150 characters. The reason for this is the low functionality of most applications for reading information from the code and the low accuracy of mobile phone cameras, which simply cannot recognize the cipher.
For mobile devices and tablets based on there are applications such as "QR Reader for iPhone" and "QR Code Reader", respectively, and they can be purchased for free in official online stores ( appstore.com or play.google.com). To scan a barcode, just launch the application and simply point the camera at the QR code image, after which a window with encrypted information will open. If you have a platform with another operating system, then you should download the application that is suitable specifically for your device. Choose a program for mobile phone possible on this site qrcoder.com).
The created QR code can be placed on the packaging of your product, billboard of your company, business card of your company, as well as on any other paper sheet or device that displays the image format.
Photo on the main page: / ghazayel.com
QR code is matrix code(two-dimensional barcode), which was developed by the Japanese company Denso-Wave back in the mid-90s of the last century. It encrypts various information: address, site name, purchase price, etc. In fact, you can encrypt anything in a QR code. There are even quests that consist entirely of QR codes.
QR codes are used all over the world. So, in some countries, such codes are used even in cemeteries, where information about the deceased is indicated. But this is rather an exception to the rule, most often QR codes are found in advertising. Sometimes they are used instead of a specific address, applied to metal plates.
The QR code itself looks like this:
In order to read the QR code, you need a smartphone (tablet) with a camera and installed application to read the QR code. Which application to choose is up to you - in Google Play Market there are a lot of them. Sometimes applications for reading QR codes are installed in the firmware.
After installing the application, launch it and read the QR code.
In addition, by clicking on the Open Link button, you can immediately open it in your browser.
Just? It doesn't get easier. And do not forget that you can encrypt information in QR codes yourself - there are a lot of services for this. However, remember that the more letters in the ciphertext, the larger the size of the QR code.
