QR codes are made up of data modules, which are the fundamental building blocks storing the information they carry.
Understanding the Structure
A QR code's structure is essentially a grid of these data modules, forming what is referred to as the Data Matrix. These modules are typically square and arranged in rows and columns. The arrangement and state (usually black or white squares) of these modules encode the actual data, including URLs, text, contact information, and more.
Data Positioning Within the Matrix
The way data is placed within this grid follows a specific pattern to ensure efficient encoding and readability. The positioning of data bits begins from the bottom right corner of the Data Matrix.
From this starting point, the data bits are arranged by moving upward in a two-module wide column. When the data reaches the top of this column, the direction switches, and the encoding continues, effectively snaking through the matrix in two-module wide columns.
This structured approach to data placement, starting from the bottom right and moving in a specific upward and directional pattern within two-module wide columns, is key to how QR codes efficiently store and allow for rapid scanning of information.
