Denis E. Tranca

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This paper deals with the filtering of microscopic images with moiré like noise patterns. The proposed method analyzes the magnitude spectrum of the Fast Fourier Transform of the noisy image, determines and removes the undesired components. Comparisons with a classical method are provided. The experimental results obtained so far are promising.
A new method for high-resolution quantitative measurement of the dielectric function by using scattering scanning near-field optical microscopy (s-SNOM) is presented. The method is based on a calibration procedure that uses the s-SNOM oscillating dipole model of the probe-sample interaction and quantitative s-SNOM measurements. The nanoscale capabilities of(More)
Imaging tissue samples by polarization-resolved second harmonic generation microscopy provides both qualitative and quantitative insights into collagen organization in a label-free manner. Polarization-resolved second harmonic generation microscopy goes beyond simple intensity-based imaging by adding the laser beam polarization component and applying(More)
Silicon carbide is one of the most promising materials for power electronic devices capable of operating at extreme conditions. The widespread application of silicon carbide power devices is however limited by the presence of structural defects in silicon carbide epilayers. Our experiment demonstrates that optical second harmonic generation imaging(More)
In our work we present some investigations on biological samples at micro and nanoscale by using nonlinear effects in laser scanning microscopy techniques. We developed an integrated multimodal system that allows for the simultaneous image acquisition from multiple optical imaging modalities. Our system includes several microscopy techniques working in far(More)
The Bag-of-Features (BoF) paradigm has been introduced to the field of computer vision about a decade ago. Since then, its potential for image classification and retrieval tasks has been demonstrated in numerous experiments, which contributed to BoF approaches becoming well-established in the field. The BoF methods reported to date use mainly spatial(More)
Laser Scanning Microscopy Techniques such as Confocal Microscopy, Two Photon Excitation Microscopy, Second Harmonic Generation Microscopy or Fluorescence Lifetime Imaging have been successfully employed to date for imaging skin cancer. However, the resolution that such techniques can provide is limited by diffraction, which prevents accurately imaging (and(More)
Interactions between two counter-propagating self-trapped beams at infrared wavelengths are experimentally observed in bulk photorefractive semiconductor material InP:Fe. The experimental results are in good concordance with computer simulations. Using these simulations we show that it is possible to develop optical interconnections based on waveguides(More)