A Novel Lenticular Angle Gauge for High-Accuracy Fiducial Markers

Lenticular angle gauge (LEAG) is a planar pattern that visualizes relative orientation by the position of the black line, which moves according to the viewing angle. LEAG has the potential to turn arbitrary planar patterns into high-accuracy markers. The author has developed a new LEAG in which the direction of movement of the black line is 90◦ different from that of the previous LEAG. With this, it is no longer necessary to place two LEAGs orthogonally to create a high-accuracy fiducial marker. This paper describes the principle and behavior of the new LEAG, and the results of its functional test. A new design of high-accuracy marker under development is also presented.