Browsing by Author "Onural, Levent"
Now showing items 1-20 of 61
-
Analysis of the complex light field generated by a deflectable mirror array device
(SPIE, 2006)An exact analysis of the scalar coherent monochromatic light field produced by a deflectable mirror array device is presented. The three-dimensional light field is related to the tilt angles of the mirrors. The first ... -
Analysis of the longitudinal component of the electric field generated by flat and pixelated liquid crystal displays
(IEEE, 2016-07)The longitudinal, z, component of the electric field is investigated for the pixelated and flat liquid crystal displays (LCDs) for monochromatic case. The pixelation process is assumed to occur in free space. The z component ... -
An automated system for design-rule-based visual inspection of printed circuit boards
(IEEE, 1991)The design and the implementation of an automated, design-rule-based, visual printed circuit board (PCB) inspection system are presented. The system employs mathematical-morphology-based image processing algorithms. This ... -
Baǧlanırlıkla yönlendirilmiş uyarlamalı dalgacık dönüşümü ile üç boyutlu model sıkıştırılması
(IEEE, 2007-06)Dikdörtgensel olmayan dalgacık dönüşümüne dayalı çok çözünürlüklü üç boyutlu model sıkıştırılması için iki yöntem önerilmektedir. Bunlar Sıradüzensel Ağaç Yapılarının Kümelere Bölütlenmesi (Set Partitioning In Hierarchical ... -
Bessel functions-based reconstruction of non-uniformly sampled diffraction fields
(IEEE, 2007)A discrete computational model for the diffraction process is essential in forward problems related to holographic TV. The model must be as general as possible, since the shape of the displayed objects does not bear any ... -
Capture, processing, and display of real-world 3D objects using digital holography
(IEEE, 2010)"Digital holography for 3D and 4D real-world objects' capture, processing, and display" (acronym "Real 3D") is a research project funded under the Information and Communication Technologies theme of the European Commission's ... -
Circularly configured multi-SLM holographic display system
(IEEE, 2011)The designed circular holographic display system produces ghost-like 3D optical reconstructions of a computer generated 3D model. System uses six phase-only reflective-type spatial light modulators (SLMs) that are configured ... -
Color holographic reconstruction using multiple SLMs and LED illumination
(SPIE, 2009-01)A color holographic reconstruction technique by using three light emitting diodes (LEDs) is described. Reflective type phase-only spatial light modulators (SLMs) are used since they are suitable for in-line phase holograms. ... -
Computation of holographic patterns between tilted planes
(SPIE - International Society for Optical Engineering, 2006-05)Computation of the diffraction pattern that gives the desired reconstruction of an object upon proper illumination is an important process in computer generated holography. A fast computational method, based on the plane ... -
Connectivity-guided adaptive lifting transform for image like compression of meshes
(IEEE, 2007-05)We propose a new connectivity-guided adaptive wavelet transform based mesh compression framework. The 3D mesh is first transformed to 2D images on a regular grid structure by performing orthogonal projections onto the image ... -
Current research activities on holographic video displays
(SPIE, 2010)"True 3D" display technologies target replication of physical volume light distributions. Holography is a promising true 3D technique. Widespread utilization of holographic 3D video displays is hindered by current technological ... -
Design and implementation of a DMD based volumetric 3D display
(IEEE, 2008-05)A real image swept-volume volumetric display is developed. A piston type moving screen is used to obtain the desired volume. A commercially available DMD device is used to project 2D slices of a 3D frame. There is a varying ... -
Design and implementation of a general purpose VLSI median filter unit and its applications
(IEEE, 1989)A VLSI median filter unit has been designed and implemented in 3-μ m M2 CMOS, using full-custom VLSI design techniques. The unit consists of two single-chip median filters, one extensible and one real-time. The chips are ... -
Design of a 360-degree holographic 3D video display using commonly available display panels and a paraboloid mirror
(SPIE, 2017)Even barely acceptable quality holographic 3D video displays require hundreds of mega pixels with a pixel size in the order of a fraction of a micrometer, when conventional flat panel SLM arrangement is used. Smaller pixel ... -
Diffraction and holography from a signal processing perspective
(SPIE, 2006)The fact that plane waves are solutions of the Helmholtz equation in free space allows us to write the exact solution to the diffraction problem as a superposition of plane waves. The solution of other related problems can ... -
Effect of sample locations on computation of the exact scalar diffraction field (in English)
(IEEE, 2012)Computer generated holography is one of common methods to obtain three-dimensional visualization. It can be explained by behavior of propagating waves and interference. To calculate the scalar diffraction pattern on a ... -
Feature issue of digital holography and 3D imaging (DH) introduction
(Optical Society of America (OSA), 2014-07)The OSA Topical Meeting "Digital Holography and 3D Imaging (DH)," was held in Seattle, Washington, July 13-17, 2014. Feature issues based on the DH meeting series have been released by Applied Optics (AO) since 2007. This ... -
Filtering in fractional Fourier domains and their relation to chirp transforms
(IEEE, 1994-04)Fractional Fourier transforms, which are related to chirp and wavelet transforms, lead to the notion of fractional Fourier domains. The concept of filtering of signals in fractional domains is developed, revealing that ... -
A general purpose VLSI median filter and its applications for image processing
(IEEE, 1989)A general-purpose median filter configuration consisting of two single-chip median filters is proposed. One of the chips is designed for applications requiring variable word-length and variable window size, whereas the ... -
Generation of a polarized optical field from a given scalar field for wide-viewing-angle holographic displays
(Elsevier, 2020-08-20)Although the scalar wave theory does not fully describe the nature of the light, which is a vector wave field, it is common to characterize the optical field propagated from an object as a scalar wave in 3DTV research. A ...
