dc.description.abstract | Abstract
The conical holographic sterogram was developed in 1989 by Japanese research team led by K. Okada. They recorded 2D image information belonging to different angles of the original object in a sequence of long, thin and fan-shaped areas of the recording film. Therefore, the reconstructed image will have many black stripes. It looks like viewing an image through a fence, called the “picket-fence effect”. This problem can be amended by using the image-plane technique. Before study, they add cylindrical lenses in both the object beam and the reference beam to compensate for the “astigmatic effect”, produced when hologram is curved into a conical surface.
This time in the study, the effect of bending the object information plane concerns us. Using the way of image-plane of conical holographic sterogram, we reshape the object information plane into a conical one without cylindrical lenses in both of the object and reference beam. After this kind of altering in the object plane, the image can lay on the conical surface snugly. Therefore, we simplify the step in the experiment about bending the film into a conical plane and the diffracted ray will be converged into points at the viewing window without astigmatic effect. The observer can perceive the 3D virtue images generated inside the hologram cone during reconstruction. We use numerical calculation to simulate the holographic process and the reconstructed 3D images observed at different positions. In order to increase the dimension of the vertical viewing window, we add cylindrical lenses and diffuser in the reference beam.
Using this fabrication method, we successfully record the reflection of the image-plane conical multiplex hologram and reconstruct the 3D images without the astigmatic effect. Finally, we will propose some improved methods and possibility in the future development. | en_US |