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Träfflista för sökning "WFRF:(Lopez Lopez Carlos) srt2:(2005-2009)"

Sökning: WFRF:(Lopez Lopez Carlos) > (2005-2009)

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11.
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12.
  • Schedin, Staffan, et al. (författare)
  • Vibration measurements by pulsed digital holographic endoscopy
  • 2005
  • Ingår i: Eighth international symposium on laser metrology. - Bellingham : SPIE - International Society for Optical Engineering. - 0819457574 ; , s. 729-734
  • Konferensbidrag (refereegranskat)abstract
    • Digital holographic interferometry in combination with a flexible fiber endoscope allows high precision measurements of deformations on hidden objects surfaces, inside cavities and objects with small access apertures. A digital holographic endoscopy system is described with a frequency-doubled, twin oscillator Q-switched pulsed Nd:YAG laser as light source. A sequence of digital hologram pairs are recorded with a maximum repetition rate of 260 ms. Each digital hologram is captured at separate video frames of a CCD-camera. The time separation between the laser pulses from each cavity can be set in the range from 50 to 500 mu s. The digital holograms are transferred to a PC via a frame grabber and evaluated quantitatively by the Fourier transform method. The resulting phase fringe pattern has the information needed to evaluate quantitatively the amount of the deformation. Experimental results of vibration measurements of hidden mechanical and biological object surfaces are presented. The quality of the results obtained by mechanical object surfaces is usually higher than for biological surfaces. This can be explained easily by the fact that a biological surface is much more complex than a mechanical surface in the sense that some parts of the surface may reflect the light well whereas other parts may absorb the light. Also, biological surfaces are translucent, which means that part of the light may enter inside the sample where it may be absorbed or reflected.
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13.
  • Westin, Carl-Fredrik, et al. (författare)
  • Tensor Field Regularization Using Normalized Convolution and Markov Random Fields in a Bayesian Framework
  • 2006
  • Ingår i: Visualization and Image Processing of Tensor Fields. - Berlin, Heidelberg : Springer Berlin/Heidelberg. - 3540250328 - 9783540312727 ; , s. 381-398
  • Bokkapitel (refereegranskat)abstract
    • This chapter presents two techniques for regularization of tensor fields. We first present a nonlinear filtering technique based on normalized convolution, a general method for filtering missing and uncertain data. We describe how the signal certainty function can be constructed to depend on locally derived certainty information and further combined with a spatially dependent certainty field. This results in reduced mixing between regions of different signal characteristics, and increased robustness to outliers, compared to the standard approach of normalized convolution using only a spatial certainty field. We contrast this deterministic approach with a stochastic technique based on a multivariate Gaussian signal model in a Bayesian framework. This method uses a Markov random field approach with a 3D neighborhood system for modeling spatial interactions between the tensors locally. Experiments both on synthetic and real data are presented. The driving tensor application for this work throughout the chapter is the filtering of diffusion tensor MRI data.
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  • Resultat 11-13 av 13
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