Ventseslav Sainov

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The display is the last component in a chain of activity from image acquisition, compression, coding transmission and reproduction of 3-D images through to the display itself. There are various schemes for 3-D display taxonomy; the basic categories adopted for this paper are: holography where the image is produced by wavefront reconstruction, volumetric(More)
Advances in image sensors and evolution of digital computation is a strong stimulus for development and implementation of sophisticated methods for capturing, processing and analysis of 3D data from dynamic scenes. Research on perspective time-varying 3D scene capture technologies is important for the upcoming 3DTV displays. Methods such as(More)
The paper focuses on the performance of a phase-shifting profilometric system with a sinusoidal phase grating as a projection element under simultaneous multi-wavelength projection of four phase-shifted patterns at divergent illumination and simultaneous multi-camera registration. The quality of the projected fringes is evaluated by calculation of the(More)
The present work focuses on a sinusoidal phase grating as a pattern projection element in a phase-shifting profilometric system. Usage of the phase grating for fringe pattern generation under coherent illumination proposes several advantages as technical simplicity, high efficiency, minimization of the phase-shifting error, large focal depth and(More)
Advances in image sensors and evolution of digital computation is a strong stimulus for development and implementation of sophisticated methods for capturing, processing and analysis of 3D data from dynamic scenes. Research on perspective time-varying 3D scene capture technologies is important for the upcoming 3DTV displays. Methods such as(More)
Phase-shifting profilometry requires projection of sinusoidal fringes on a 3D object. We analyze the visibility and frequency content of fringes created by a sinusoidal phase grating at coherent illumination. We derive an expression for the intensity of fringes in the Fresnel zone and measure their visibility and frequency content for a grating that has(More)
An interferometer is investigated in which the interacting beams undergo total internal reflection from a boundary surface with a variable relative refractive index. The high sensitivity of the change in the interference pattern with respect to small changes in the refractive index in the vicinity of the critical angle is theoretically proved and(More)
To order the complete compilation report, use: ADA398590 The component part is provided here to allow users access to individually authored sections f proceedings, annals, symposia, etc. However, the component should be considered within [he context of the overall compilation report and not as a stand-alone technical report. The diffraction gratings in 10,(More)
The paper describes a system for polariscopic and holographic phase-shifting implementation of the photolastic-coating method for full-field stress analysis. The easiest way to build the combined system is to use a laser light source. However, coherent illumination introduces a signal dependent speckle noise which worsens the accurate phase estimation and(More)
The experimental results as well as the theoretical background of evanescent wave holographic recording of gratings with 3.2, 0.88 and 0.37 mum pitch (corresponding to spatial frequencies of 310, 1140 and 2700 mm<sup>-1</sup>) in nano-sized As<sub>2</sub>S<sub>3</sub> films are presented. The thickness of the recording medium is 29 nm. The grating recording(More)