Optical See-through Scope for Observing the Global Component of a Scene

The reflected light on a physical object can be separated into a direct illumination component and a global illumination component. Observing only the global component provides a better understanding of the reflectance property of the surface. In conventional methods, the components are separated using computer vision techniques. In this study, we developed a see-through optical scope that allows a user to selectively observe the global component using high spatial frequency pattern projection and a high spatial frequency mask with a liquid crystal panel. We confirmed that only the global component could be observed with the naked eye through the scope.