We use a single camera and variable-moiré-patterns (VMPs).
The VMP consists of a microlens array (or lenticular lenses) and a fine periodic pattern, and displays a moiré pattern which seems to move according to the seeing angle.
We developed a technique of measuring the relative angle between a camera and a VMP, by detecting the variation of the pattern by an image processing.
We applied the technique to AR markers, and solved the biggest problem of conventional AR markers that the accuracy of orientation estimation becomes worse when we see a marker from a frontal direction.
Our technology contributes to improvement of the contents of AR systems because it enables stable display of virtual objects even in frontal direction.
The technology can be utilized in other fields such as robot control, measurement, and development of new measurement equipment.
The new AR marker is small, inexpensive, and needs no electric power. Therefore, it is suitable for massive production and usage as the infrastructure for positioning and AR systems.
