The Research Of Fast Algorithm And Display Of Computer-generated Hologram For Three Dimension Objects

All the wave-front information of three dimension objects can be reconstructed by holography display technology which is considered as the most promising display technology in display field.Holography display technology bases on spatial light modulator can achieve dynamic and true color three dimension display,universities and companies are deeply attracted by it.At present,the development of holography three dimension display technology is mainly limited by low resolution of the display device and the large calculation amount of hologram.How to improve the resolution of display device and quickly obtain computer-generated hologram for algorithm and system is still need to be studied.In this paper,we mainly study the rapid generation algorithm of hologram based on liquid crystal spatial light modulator.The main contents are as follows:The thesis firstly introduces the three dimension display technology and analyzes its status and development.The related theoretical knowledge on the basis of scalar diffraction calculation is introduced.the equivalent distance is used to revise diffraction formula to reconstruct digital holography instead of record distance When light wave propagates in non-single medium.The results show that the consequence of wave-front reconstruction using equivalent distance to reconstruct digital hologram are consistent with the results obtained by collins formula reconstruction.Next,The basic capability of spatial light modulators and principles of phase modulation are briefly introduced.Simply deducing the impulse response of the spatial light modulator,and the depth of image system based on the LCOS holographic three dimension display is derived.Finally,the simulation and experimental reconstruction of phase hologram are achieved by iterative algorithm based on fresnel diffraction integral.Finally,the traditional point source algorithm,the split look-up table algorithm,specially wave-front record plane algorithm are studied.proposing light source transformation algorithm layeres with focal depth of image system based on the previous research of our group while ambient light illumination and object occlusion are considered.The speed to make computer-generated hologram with light source transformation algorithm is 100 times faster than traditional point source algorithm.At the same time,its surely that large size object can be reconstructed while fourier transform algorithm is adopted to compute complex amplitude from projection plane to the holographic plane.in the focal depth range,the light source transformation algorithm is used to reconstruct the simple color three-dimensional objects,which can lay the foundation for the realization of complex colorful three dimension holography in later research.building a three dimension display system based on spatial light modulator,which realizes the photoelectric reproduction of three dimension objects with good experimental results.