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http://cio.repositorioinstitucional.mx/jspui/handle/1002/789| NOVEL COMBINATION OF LCOS AND TEMPORAL PHASE UNWRAPPING FOR 3D SHAPE RECONSTRUCTION | |
| CHRISTHIAN ADONAI GONZALEZ VALDEZ | |
| Abundio Davila | |
| Acceso Abierto | |
| Atribución-NoComercial-SinDerivadas | |
| SPATIAL LIGHT MODULATOR, SHAPE MEASUREMENT, METROLOGY, INTERFEROMETRY, STRUCTURED LIGHT | |
| "Recent developments on Spatial Light Modulator systems based on reflective liquid crystal microdisplays have allowed the technologies of Liquid Crystal over Semiconductors (LCoS).The highest potential of the Spatial Light Modulators is that they have dynamic addressable diffractive elements that can be used for projection purposes in multimedia projectors, High-definition television, and for experimental purposes on laboratory. However, the projecting capabilities should be tailored for specific applications, and its performance should be assessed depending on the particular application. In industry today, the use of tactile point measuring principles are changing in favor of optical non-contact field measuring techniques, this open a new field in the research area of optical metrology which purpose is the application of techniques such as speckle interferometry, Moiré and fringe projection as a way to solve real industrial problems. 3D shape measurement has been performed in the last decades using fringe projection schemes. A recently developed method that uses projected fringe patterns is the temporal phase unwrapping (TPU) in which fringes of varying pitch and phase are projected and acquired sequentially in time. The advantage of this method with respect to the traditional spatial phase unwrapping, is the evaluation of the phase in each detector element independently from the other detector counterparts. Hence, phase errors become isolated in the image, and do not influence the result of their neighbors. However, shadows and low intensity reflected from the specimen under investigation could cause errors into the final unwrapped phase. Noise immunity in the TPU has been studied and solved by using branch cut surfaces. The combination of phase extraction methods with quality maps for phase unwrapping has been proposed previously. Bone[2] first incorporates the concept of phase quality into spatial phase unwrapping by means of a quality mask. This was followed by different approaches in terms of further algorithms based on quality maps[3, 4, 5]. To avoid the spatial unwrapping errors, we use the TPU and extrapolated the quality map application to avoid shadows and low modulation pixels. A threshold value in the histogram of the quality map allows to select areas of high visibility in which the temporal phase unwrapping algorithm can be successfully applied." | |
| 2007-11 | |
| Tesis de maestría | |
| Inglés | |
| León, Guanajuato | |
| Público en general | |
| González Valdez, (2007). "Novel Combination of LCoS and Temporal Phase Unwrapping for 3D Shape Reconstruction". Tesis de Maestría en Ciencias (Óptica). Centro de Investigaciones en Óptica, A.C. León, Guanajuato. 81 pp. | |
| OPTICA FÍSICA | |
| Versión publicada | |
| publishedVersion - Versión publicada | |
| Aparece en las colecciones: | MAESTRIA EN CIENCIAS (ÓPTICA) |
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