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Computer Generated Hologram Encoding Technique

Author: ZhangHaiQing
Tutor: WangXiaoYing
School: Xi'an University of Technology
Course: Optics
Keywords: Computer generated hologram Coding algorithm Complex-valued function Non - complex-valued holographic function Cryptosystem
CLC: O438.1
Type: Master's thesis
Year: 2011
Downloads: 159
Quote: 0
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Abstract


CGH is built on the foundation of modern optical digital computing combined. Since the introduction of the laser holographic technology ushered it life again, to the \Calculated unprecedented development in the field of holographic technology in optical data processing, storage, and encryption, interferometry and three-dimensional objects display in the rapid development and wide application accompanied by a digital computer and digital signal processing technology, it not only as optical holography comprehensive record of the amplitude and phase information of the object wave, and has a high flexibility, repeatability, and other characteristics. Holographic imaging technology is a rapid development of new technologies, it has made great achievements in the theory and practice, has not only been the field of optics, as well as other areas of widespread concern. Wavefront recording and reproducing the wavefront is the holography imaging process in two main steps, the reproduction of the original object wave application is the white or monochromatic light in the wave surface hologram recorded on the recording medium. According to the holography using visible light waves, microwave, acoustic and radio frequency waves, we produced holograms sequentially called optical hologram, radio hologram acoustic hologram. We can be a combination of holography and computer technology, the use of computer-generated hologram. This production method is the mathematical description of the object wave is input to the computer, and to draw out the hologram after processing, and finally with an optical method to reproduce. This you can see that the use of computer generated hologram does not require the actual presence of the image of an object. This way, the computer controlled micro meter display or plotter drawing, then the photoengraving made is to calculate the hologram. In the process of making holograms, the wave surface of the recording and reproducing are complex signal space, but also must be these complex value signal calculated holographic coding. This article on the theoretical basis of in-depth study of computer generated hologram, in order to ensure whether or plotter records mapping can eventually complete optical methods reproduce these complex function with a micro-meter to a space of complex-valued discrete convert the real value of the non-multiplexed holographic function, focusing on the complex-valued signals calculated holographic encoding conversion process. First examine the basic principles of CGH encoding algorithm, compare their pros and cons; then tries to study a combination of calculation the holographic encoding algorithm with cryptography algorithm based on the basic principles of the CGH encoding, through the comparative study of various algorithms in cryptography select the algorithm to calculate the holographic coding theory; reproduction through the simulation analysis of the results of computer simulation hologram.

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CLC: > Mathematical sciences and chemical > Physics > Optics > Information Optics > Holographic optical
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