Research For Holographic Integral Photography By The Combination Of Computer And Optics

As a important kind of three-dimensional display technology, holography has been considered as the most ideal and promising method. By recording and reconstructing wavefront of the object, holography can realize 3D color display of the object. In the recording progress of traditional holography, high coherent light source is needed, and the condition of environment should be extremely quiet. As a result, holograms are usually made in laboratory. Computer generated holography (CGH), which substitute the compute encoding process for laser recording process of traditional holography, overcome the disadvantages of traditional holography and realize the holographic recording of virtual 3D scene. However, it's still difficult to make a large size of CGH by now, because the size of CGH is restricted by the. size of print device, microfilm device and the enormous amount of computation.In 1967, R.V. Pole combined the traditional stereographic technology—integral photography with holography, and realized holographic display of the object that illuminated in white light. This technology extends the application area of holography greatly. And simultaneous accelerates the practical application progress of holography. However, Pole's holographic integral photography technology c an only be adapt to the earthy object, and not suitable for virtual 3D scene.In order to overcome the disadvantages of CGH and traditional holographic integral photography, and realized the holographic display of virtual 3D scene in large size, we propose a new method that combined the computer graphics technology and holographic integral photography in this dissertation. The method is base on the following theory: computer graphics, holography, integral photography, principle of rainbow holography and the principle of color holography.The detailed procedure of the proposed method is as follows: firstly, load the data of the 3D virtual scene, and secondly, code the 3D virtual scene using virtual holocoder, at last, print the stereographic image series and make the hologram of virtual 3D scene according to the principle of rainbow or color holography.In this dissertation, feasibility of the method has been analyzed theoretically at first, and then experiments also been performed to support the validity of the method. And the main work is as follows:1. The principles of traditional holographic integral photography and computer graphics have been compared.2. Loading the data of 3D virtual scene file. The difference of different 3D data file formats have been analyzed, and according to the different character, different data loading programs have been given.3. Holographic encoding of quasi 3D scene. According to the character of quasi 3D scene and the principle of geometric optics, program of virtual holocoder that adapt to quasi 3D scene has been given.4. Holographic encoding of virtual 3D scene. According to the principle of computer graphics, program of virtual holocoder that adapt to virtual 3D scene has been given.5. Rainbow holographic display of virtual 3D scene. According to the principle of rainbow holography, rainbow hologram of virtual 3D scene has been made using stereographic image series which output by high graphics printer.6. Color holographic display of virtual 3D scene. According to the principle of color holography, color hologram of virtual 3D scene has been made using three monochromy stereographic image series whose color is separated in computer and then output by high graphics printer.