AR Camera Calibration Using Dual-View Marker Detection

The patent uses a marker (copy object) placed in the real world that can be captured by both the first camera (worn by user) and second camera (fixed in environment). By detecting the marker's position and posture from both cameras, the system establishes correspondence between the two cameras without requiring observation cameras at user eye positions. This copying approach simplifies the calibration setup while maintaining estimation accuracy.

The patent introduces a marker as an intermediary object that mediates the calibration process between the first camera and second camera. The marker serves as a common reference point that both cameras can observe, enabling the calculation of positional relations without direct observation of user eye positions. This intermediary approach resolves the contradiction by providing a practical calibration method that achieves accuracy without complex setup.

The patent enables the calibration system to perform self-calibration by using the marker detected from images captured by the first and second cameras. The calibration processing section automatically calculates correction information based on the detected marker positions and postures, without requiring manual intervention or specialized calibration environments. This self-service approach allows users to perform calibration in ordinary environments, significantly improving ease of operation while maintaining accuracy.

The patent makes the calibration process universal by using a simple marker that can be placed in any ordinary environment rather than requiring dedicated calibration facilities. The same calibration approach can be applied regardless of the specific environment, making the system adaptable and easy to operate in various settings. This multi-functionality resolves the contradiction between accuracy and accessibility.

The patent performs calibration at factory shipment as a preliminary action to establish initial accurate parameters. The calibration processing section calculates correction information based on marker detection, and this correction information is stored and applied during actual use. This preliminary calibration ensures both initial accuracy and long-term reliability by providing a baseline that compensates for future parameter drifts.

The patent implements a feedback mechanism where the system periodically performs calibration by detecting the marker and recalculating correction information. This feedback loop allows the system to adapt to parameter changes caused by aging and environmental factors, maintaining reliability over time. The calibration results from previous operations serve as feedback to update and refine the correction information, ensuring long-term parameter stability.