What primary technology does augmented reality rely on for functionality?

The primary technology that augmented reality (AR) relies on for functionality is sensor fusion. Sensor fusion involves integrating data from various sensors, such as cameras, GPS, accelerometers, and gyroscopes, to provide accurate context and location information. This integration allows AR systems to understand the physical environment and superimpose digital content onto the real world, creating an immersive experience.

When AR applications utilize sensor fusion, they can determine the user's position and orientation in real time. This capability is essential for overlaying graphics, animations, or information onto the user's view, ensuring that the virtual elements align correctly with the physical world. As a result, sensor fusion creates a seamless interaction between the digital and real environments, enhancing the overall user experience.

Other technologies like GPS, 3D modeling, and image recognition play supporting roles in AR applications but do not encompass the primary functionality required for AR to operate effectively. For example, GPS can provide location data, 3D modeling is important for creating the digital content itself, and image recognition aids in identifying objects within the environment, but none alone can facilitate the core interaction that AR offers.