Measurement of shape and refractive index of transparent object

When digitalizing characteristics of objects, shapes of objects is very important information. However the measurement methods of transparent objects are few. This paper proposes a new measurement method of a transparent object by changing background patterns. A silhouette of the transparent object is extracted using the change of the background patterns according to refraction, and the shape is measured with the use of the silhouette. Furthermore, the refractive index of the transparent object is estimated by changing background patterns and the measured shape.