Advisors
Now showing items 1-20 of 26
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3-dimensional median-based algorithms in image sequence processing
(Bilkent University, 1990)This thesis introduces new 3-dimensional median-based algorithms to be used in two of the main research areas in image sequence proc(',ssi,ng; image sequence enhancement and image sequence coding. Two new nonlinear filters ... -
3D reconstruction of point clouds using multi-view orthographic projections
(Bilkent University, 2006)A method to reconstruct 3D point clouds using multi-view orthographic projections is examined. Point clouds are generated by means of a stochastic process. This stochastic process is designed to generate point clouds ... -
An Automated rule based visual printed circuit board inspection system which uses mathematical morphological image processing algorithms
(Bilkent University, 1990)In this thesis, the design and implementation of an automated rule based visual printed circuit board (PCB) inspection system are presented. The developed system makes use of mathematical morphology based image processing ... -
Calculation of scalar optical diffraction field from its distributed samples over the space
(Bilkent University, 2010)As a three-dimensional viewing technique, holography provides successful threedimensional perceptions. The technique is based on duplication of the information carrying optical waves which come from an object. Therefore, ... -
Computation of holographic patterns between tilted planes
(Bilkent University, 2004)Holography is a three-dimensional visualization method. This method depends on duplication of information-carrying optical waves which come from a threedimensional environment in the absence of the original source. ... -
Design and implementation of a general purpose median filter unit in VLSI
(Bilkent University, 1988-10)The median of a group, containing an odd number of elements, is defined as the middle element, when the elements of the group are sorted. A median filter finds the median of a number of elements at its inputs. Median filters ... -
Feature point classification and matching
(Bilkent University, 2007)A feature point is a salient point which can be separated from its neighborhood. Widely used definitions assume that feature points are corners. However, some non-feature points also satisfy this assumption. Hence, ... -
Generation and parameter estimation of Markov random field textures and a parallel network for texture generation
(Bilkent University, 1990)In this thesis, a special class of Markov random fields (MRF), which is defined on two dimensional pixel arrays and represented by a few numbers called the MRF parameters, is studied as a texture model. Specifically, the ... -
Improving the resolution of diffraction patterns from many low resolution recordings
(Bilkent University, 2010)Holography attempts to record and reconstruct wave fields. The resolution limitation of the recording equipments causes some problems in the reconstruction process. An automatic method for the registration and stitching ... -
Issues in developing a very low bit rate videophone coder
(Bilkent University, 1993)The issues of a suitable transmission image size, general behaviour, and buffer control of a very low bitrate videophone video signal coder to be used in future mobile and public switched telephone networks are addressed. ... -
Local signal decomposition based methods for the calculation of three-dimensional scalar optical diffraction field due to a field given on a curved surface
(Bilkent University, 2013)A three-dimensional scene or object can be optically replicated via the threedimensional imaging and display method holography. In computer-generated holography, the scalar diffraction field due to a field given on an ... -
A method for extracting object related information from in-line holograms using Wigner distribution
(Bilkent University, 1990)In this thesis, a method based on Wigner distribution is developed to find the three-dimensional coordinates of particles directly from their in-line hologram without reconstruction. If a one-dimensional discrete hologram ... -
Motion artifact reduction techniques in magnetic resonance imaging
(Bilkent University, 1991)It is shown that the expansion/shrinkage and rotational motions of the body cause phase and amplitude distortions and non-rectangular sampling over the A:-domain. If these distortions are not compensated then the reconstructed ... -
Object-based 3-d motion and structure analysis for video coding applications
(Bilkent University, 1997)Novel 3-D motion analysis tools, which can be used in object-based video codecs, are proposed. In these tools, the movements of the objects, which are observed through 2-D video frames, are modeled in 3-D space. Segmentation ... -
Regularized motion estimation techniques and their applications to video coding
(Bilkent University, 1996)Novel regularized motion estimation techniques and their possible applications to video coding are presented. A block matching motion estimation algorithm which extracts better block motion field by forming and ininimizing ... -
Semi-automatic video object segmentation
(Bilkent University, 2000)Content-based iunetionalities form the core of the future multimedia applications. The new multimedia standard MPEG-4 provides a new form of interactivity with coded audio-visual data. The emerging standard MPEG-7 specifies ... -
Simulation of a holographic 3-D television display
(Bilkent University, 1990)The theory and the computer simulations of an acousto-optical holographic 3-D television display are presented in this dissertation. The technique used is based on the reproduction of the desired pattern, in our case the ... -
Simulation of DigiCipher, an HDTV system proposal
(Bilkent University, 1991)In this thesis, the digital video encoder-decoder parts of an American HDTV system proposal, DigiCipher^^'^ is simulated in an image sequencer, based on the system description sheets. Numerical and subjective performances are ... -
Surface reflectance estimation from spatio-temporal subband statistics of moving object videos
(Bilkent University, 2012)Image motion can convey a broad range of object properties including 3D structure (structure from motion, SfM), animacy (biological motion), and its material. Our understanding of how the visual system may estimate complex ... -
Three-dimensional facial motion and structure estimation in video coding
(Bilkent University, 1994)We propose a novel formulation where 3-D global and local motion estimation and the adaptation of a generic wire-frame model to a particular speaker are considered simultaneously within an optical flow based framework ...
