Optical 3D Measurement of Glass and Transparent Plastics
When it comes to non-contact, fast, and highly precise 3D measurements of objects, optical stereo-vision systems developed by the Fraunhofer IOF have proven their efficacy for certain applications in industry and research. Based on active pattern projection, new 3D systems with wavelengths in the near infrared offer accurate, irritation-free 3D measurements of humans, e.g. for applications in the field of human-machine interaction.
The basic principle of these 3D systems is the active projection of optical patterns onto the objects’ surfaces, which works successfully in the visible or near-infrared wavelength range for a multitude of materials. Yet 3D image errors always arise if the optical properties of certain materials such as glass or transparent plastics interfere with the process of diffuse reflection.