We developed a method to measure the 3D
surface shape of transparent objects by observing the
polarization state of reflected light of the object in
visible light domain and that of thermal radiation of the
object in infrared light domain.
We set the object into the middle of plastic
white sphere, and illuminate the sphere from three
direction with incandescent lamps. There is a hole on top
of the sphere, and we observed the object from the hole
by polarizer-mounted gray CCD camera. We calculate the
polarization data in visible light domain from 3 or more
images taken by rotating the polarizer each for different
angles. Then, we measure the polarization state of
thermal radiation with different measurement system. We
heat the object by a hair dryer, and observe the thermal
radiation of the object by infrared camera and infrared
polarizer. We calculate the polarization data in infrared
light domain from 3 or more images taken by rotating the
polarizer each for different angles. We calculate the
surface normal from polarization degree of visible light
and infrared light. Finally, we calculate the surface
shape from surface normal. |
