Stereo-reconstruction of contour map using holography and computer

It has been reported that stereograms (i. e. left eye picture and right eye picture) were extracted by a computer from a contour map and drawn on a piece of white paper in red and blue separately. Looking at the stereograms with the help of a stereoscope, one saw a stereo -image of the topography. But the above mentioned method is rather complicated and inconvenient for the observer. Using the liquid crystal light valve (LCLV) as a link between computer's CRT and holographic system, the authors have been able to conduct the stereo- reconstruction of a contour map. The stereograms are first extracted by a computer from a contour map and displayed on the CRT. The stereograms displayed are transformed into coherent light images with the aid of a LCLV. The hologram of the two images of the stereograms is then recorded. In this experiment the authors invented a new method to record the hologram. This new method is called double-half-slits rainbow holography. By this method, the holographic images of the stereograms may be reconstructed with white-light, and the waves of the images for the left eye and the right eye will propagate respectively to the watcher's left eye and right eye because the images of double-half-slits act here as directional carrier wave. So the watcher will see a stereo-image of the topography without the help of anything.