| 摘要(英) |
The conical holographic stereogram 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 the study, they add cylindrical lenses in both the object beam and the reference beam to compensate for the “astigmatic effect”, produced when the hologram is curved into a conical surface in order to avoid deformation of 3D image.But the way can’t produce a perfect 3D image.
In the study, we reshape the object information plane into a conical.But we use the right rather than the approximate shape of the bent surface,and we propose a new method to flatten three-dimensional images. However, this method needs to change the film manually. This is too much trouble,so we change the object plane to a flat. Although this method is very convenient,the image can’t lay on the conical surface perfectly. So we use the computer to calculate its deviation. And then,we also use the numerical calculation to simulate the holographic process and the reconstructed 3D images observed at different positions.
At last,we want to increase the dimension of the vertical viewing window,so we add cylindrical lenses and diffuser in the reference beam.And we will propose some improved methods and possibility in the future development. |
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