| Optical holography technology can record three dimensional(3D) volume information of objects, including both the amplitude as well as the spatial phase information. It has many advantages such as real-time processing capability and high resolution. Optical scanning holography (OSH) is a popular research area in the field of optical holography. Based on the development of modern digital signal device, the three-dimensional (3D) volume information of objects can be recorded into computer as digital signals, in which the 3D information becomes a two-dimensional (2D) hologram.OSH has already found wide applications, such as optical measurement, optical microscopes.remote sensing and so on. This thesis is mainly focused on sectional image reconstruction in OSH via the theoretical analysis, simulation and experimental verification. The thesis is based on the theories in OSH, such as hologram recording,reconstruction, and its main purpose is to research on extracting the axial position information of object of technique. The advantages and disadvantages of relevant algorithms have been analyzed and new algorithm have been proposed and verified via simulations and experiments.The main research areas of this thesis can be categorized into the following parts:(1) The mathematical and optical theory of OSH has been analyzed and the optical transfer function of the OSH system has been introduced. The basic theory of OSH,including recording and reconstruction, have been simulated with Matlab.(2) The basic theory of the phase correlation—Wigner distribution algorithm has been presented, both the advantages and disadvantages have been discussed. The proposed algorithm has been verified via simulation.Through the simulation, only when the object that is reconstructed between nine hundred millimeter and nine hundred and eighty millimeter as the reference objects can achieve better results; At same time we analysis the influence of the position of the reference object of the algorithm, finding that only the reference object locating at between two thousand seven hundred and fifty millimeter and six thousand and two hundred millimeter can achieve good results.(3) The principle of the Discrete cosine transform (DCT) has been introduced, after which the basic theory of 3D object axial location extraction in OSH using DCT has been analyzed. The advantages of Discrete cosine transform has been discussed. The feasibility of the proposed algorithm has been demonstrated with both simulation and experiment. |
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