The Study Of Digital Holographic Microscopy Homomorphic Signal Processed Technology

Digital holography is a characterization of three-dimensional micro-structure andmeasurement technique, with advantages of non-contact, real-time, high sensitivity,high precision, high resolution and whole-field, which achieved high degree ofintegration about optical, optoelectronic technology and computer technology. Recently,Digital holographic microscopy(DHM) has been used successfully, but there are alsomany problems, such as the resolution is not high, the real-time reconstruction is quitelow, the phase reconstruction accuracy not enough high and so on, which is hot indigital holography research, and is also the important questions to be solved in thispaper.Based on theoretic analysis, computer simulation and experiment, this paper focuson the following aspects mostly:1.Firstly, the theoretical analysis of the plane reference light and sphericalreference light pre-amplified digital holographic microscopy imaging systems, thanthree common fast Fourier transform-based linear reconstruction algorithm are brieflyintroduced in turn, in which the characteristics and scope of application about thosethree algorithms are analyzed.2.In order to overcome the shortage of digital holography reconstructed algorithmin the accuracy and the speed of reconstructed image, the digital holographicgeneralized linear reconstructing algorithm based on homomorphic signal processing isproposed. Firstiy, the generalized linear reconstructing algorithm in pre-amplificationdigital holographic microscopy system is studied theoretically, the theory provides thereconstructed condition and reconstructed procedure. then the theoretical analysis isverified by computer simulations and experimental data. Both of the results prove theadvantages of this algorithm.