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Optimizing the Balance Between Resolution, Field-of-View and Depth-of-field in Three-dimensional Imaging

Kavehvash, Zahra | 2012

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 43583 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Mehrany, Khashayar; Bagheri, Saeed; Massoumian, Farnaz
  7. Abstract:
  8. In this thesis a rigorous approach toward systematic quantification of qualitative fea-tures in a three-dimensional (3D) integral imaging is proposed. Incorporating the concepts of sampling rays and sampling points, the first approach is based on geo-metrical optics and quantifies the lateral and depth resolutions of the system within the field-of-view (FOV) and depth-of-field (DOF). The obtained results are justified through experiments. In the next step, the principals of wave optics are employed to measure the lateral and depth resolutions of the system. To this end, the concept of point-spread function is generalized to three-dimensional imaging systems. Through this systematic approach the main qualitative features of the imaging system, e.g. 3D resolvability along different directions, DOF and FOV, are analyzed. The inevitable trade-off between different qualitative features of the imaging system is also studied. These two different methodologies are in good agreement with each other.Thenceforth, a number of solutions are proposed in order to improve the per-formance of a 3D integral imaging system. The first solution utilizes the idea of frequency-division-multiplexing in communication systems in order to improve the lateral resolution and FOV. The resultant improvement of the lateral resolution of the system is analyzed through simulations and appropriate quantitative comparisons with previously proposed methods. The second solution is based on improving the point-spread-function of each lenslet in the array. This solution is implemented for a typical system, where a microorganism is to be imaged. In the third and final solu-tion, the lens-array structure is modified. The concepts of sampling ray and sapling points are employed to find the optimum pattern for the lens array. The resultant performance improvement is justified through experimental results
  9. Keywords:
  10. Resolution ; Resolution Enhancement ; Three Dimensional Imaging ; Integral Imaging ; Feild-of-View (FOV) ; Depth-of-Field (DOF)

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