Marker-based augmented reality (AR) uses specific visual markers to trigger digital content in the real world. These markers are usually images or patterns that can be uniquely identified by a camera or device. When a device scans a marker, the AR software recognizes it and overlays digital information, such as animations, graphics, or 3D models, directly onto the marker in the user's field of view. This type of AR is straightforward and effective in providing immersive experiences based on tangible objects.
The operation of marker-based AR begins with the camera of a smartphone or a compatible device capturing an image of the physical marker. The AR system processes this image to identify the marker’s features and patterns. Once the marker is recognized, the system retrieves pre-defined digital content associated with it. For instance, a marker could be a QR code or a specially designed image. When a developer creates an AR application, they define how the digital content should appear and react when the marker is detected, allowing for interactions that enhance user experience, like viewing an animated model of a product when the camera is pointed at its packaging.
Examples of marker-based AR applications include educational tools that display scientific models when a particular textbook page is scanned, or marketing campaigns where product packaging leads to interactive ads. Another example is games that incorporate physical cards as markers, unlocking in-game characters or features when scanned. This method is ideal for controlled environments where users can interact with specific objects, making it popular for training, advertising, and educational applications. By using marker-based AR, developers can create engaging experiences that blend the physical and digital worlds seamlessly.