Cylindrical Holographic Stereogram Research Articles

Holography of 3D surface reconstructed CT images.

A multiplex hologram (cylindrical holographic stereogram) was successfully made from three-dimensional (3D) surface reconstruction CT images of a child with plagiocephaly. This method appears to be suitable as one of the projectional aids of 3D surface reconstruction CT images that are proving useful in plastic and reconstructive surgery. The principle of the method is described. Also discussed is the possibility of developing a computer-aided hologram synthesizing system that could be used for images obtained with U-arm X-ray equipment (by either cinefilm, or videotape, or digital subtraction angiography) or by CT as well as MR. For practical use, it is necessary for the hologram to be synthesized in a short time. One of the key problems in developing such a machine is the need for an incoherent-to-coherent image converter.

Characteristics of the Distortion of the Reconstructed lmage from a Cylindrical Holographic-Stereogram

Characteristics of the Distortion of the Reconstructed lmage from a Cylindrical Holographic-Stereogram

3-D distortion of observed images reconstructed from a cylindrical holographic stereogram. (1) laser light reconstruction type

In the case that the image reconstructed from a cylindrical holographic stereogram with laser light reconstruction (LCHS) is observed by binocular vision, the 3-D distortion characteristics of the image are studied. Using an object of a distinctive construction, some examples are calculated and experimental results are also shown, and the optimum condition to synthesize the LCHS is given.

3-D distortion of observed images reconstructed from a cylindrical holographic stereogram. (2) white light reconstruction type.

The 3-D distortion of the observed images reconstructed from cylindrical holographic stereograms with white light reconstruction (WCHS) are considered, and, from the viewpoint of the distortion, the area of the viewing position is presented.

Color Holographic Stereograms

The cylindrical holographic stereogram, invented by Lloyd Cross, is one of the most significant developments of the last decade in commercial holography. This hologram has several technical problems, however, which have limited its application in the commercial marketplace. Two of these problems are its limited vertical viewing range and rainbow colored rather than natural colored images. This paper reviews the general problem of color holography and discusses the specific requirements for generating color images in Cross holograms. Several optical techniques are described, and experimental results obtained with one especially promising technique are presented.