QR Codes are made of multiple rows and columns. The combination of these rows and columns makes a grid of modules squares. There can be a maximum of rows and columns which means the maximum possible number of modules is 31, With the naked eye these are just small squares and mean very little, but the exact arrangement of those modules allows the QR Code to encode its data. This means that unlike traditional barcodes which are 1 dimensional and use 1 row of lines, QR Codes use 2 dimensions which allows them to store a lot more data in the same area of space.
There are 40 preset sizes that you must select from. These are referred to as versions. Version 1 QR Codes will have 21 rows and 21 columns. Each version thereafter increases by 4 rows and 4 columns. The largest version is version 40 which has rows and columns and results in the 31, needed to encode the 3kb of data. As a result, QR codes can be placed almost anywhere without question on whether or not they can be accessed by scanners. It can be placed on flyers and magazines which people have immediate and direct access to but as well as posters, stickers, and even on the screens of any device.
There are two types of QR codes: static and dynamic. They both look the same but are differentiated by the features that come with them. Static has fixed embedded data so that when they are printed, there is no way for them to be updated. On the other hand, dynamic QR codes can be updated anytime. Instead, just update from the comfort of your computer.
Furthermore, this interchangeable content allows for variability. Creators have the option to have a QR code function differently based on the time of the day, location, or how many times it has been scanned.
There is also the feature to track the performance of a QR code such as the total number of scans, when and where a scan has been made, and the device used.
Generally, a dynamic QR code is able to do a lot more than a static QR code. So, it begs the question, does it hold more information than the other? A QR code data size is fixed all throughout, regardless of being a static or dynamic QR code.
It is because both types of QR codes are physically the same. Therefore, they have the same maximum number of modules. QR codes are not the only two-dimensional code currently available. Another one that is also widely used is a data matrix code. At first glance, it looks the same since it is a bunch of pixels packed inside a square.
However, upon closer inspection, there are key differences that set the physical limitations of the two. The three bigger squares on each corner of a QR code are the alignment pattern.
For a data matrix code, that comes in the form of an L-shaped solid black border. These differences are also what sets the limitations, because of the number of modules each is able to accommodate. A QR code data size limit is 7, numeric characters, but for a data matrix, it is only 3, characters. When talking about alphanumeric characters, the data matrix trails behind 2, characters with no support for other types of language. As a result, QR codes come out as a superior alternative when the data size limit is in question.
A QR code has the capacity to hold more than enough information that is needed. Micro QR has one. The position of QR code is detected with the position detection patterns that allow high-speed reading. It can be read from any direction, which significantly improves work efficiency. The alignment pattern is used for position detection when there is displacement of modules due to distortion. It is applied to model 2. The margin is a blank area around the QR code.
Model 1 and 2 require a margin of four modules and Micro QR code requires of two modules. It contains the error correction rate and mask pattern of the code. The format information is read first when the code is decoded. Reed-Solomon code is applied to restore the data when a part of QR code is missing or damaged. The restoration rate varies on 4 different error correcting levels. Data and error correcting code are arranged as shown below. Sample: Version 2 of Model 2 with level M A mask is applied to the code to prevent the same pattern with the position detection pattern from appearing.
They have different features and data capacities.
0コメント