John Kalomiros

John Kalomiros
International Hellenic University · Informatics Computers and Telecommunications Engineering

BSc (Physics), MSc(Electronics), PhD (Physics), PhD(Electronics)

About

68
Publications
17,927
Reads
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765
Citations
Introduction
John A. Kalomiros received the degree of Physics a MS degree in Electronics and a PhD from the Aristotle University of Thessaloniki, Greece. His research interests include micro-electronic devices, microcontrollers, design of digital systems and machine vision. He is faculty member in the Department of Informatics, Computers and Telecommunications Engineering, International Hellenic University, Serres Greece, where he teaches electronics and related subjects.
Additional affiliations
June 2015 - November 2016
Technological Educational Institute of Central Macedonia at Serres
Position
  • Professor (Associate)
March 2008 - May 2015
Technological Educational Institute of Central Macedonia at Serres
Position
  • Professor (Assistant)
March 2008 - present
Technological Educational Institute of Central Macedonia at Serres
Position
  • Professor (Associate)
Description
  • Analog and Digital Electronics, Hardware Description Langauges, Microcontrollers
Education
October 2005 - December 2010
Democritus University of Thrace
Field of study
  • Electronic applications for robotic vision
October 1985 - July 1989
Aristotle University of Thessaloniki
Field of study
  • Semiconductors
October 1984 - July 1988
Aristotle University of Thessaloniki
Field of study
  • Electronics

Publications

Publications (68)
Article
Full-text available
A fundamental problem in computer vision is finding correspondences between features in pairs of similar images. By comparing feature descriptors instead of pixel intensities, the matching capability is significantly increased. Keypoints extracted by Scale-Invariant Feature Transform (SIFT) provide superior matching ability, however, a small propor...
Article
Image feature extraction constitutes a fundamental task in robotic vision applications. Scale-Invariant Feature Transform (SIFT) has been widely used as a robust method for detecting and matching features. Nevertheless, SIFT algorithm is computationally demanding and its implementation in an embedded system requires a subtle approach. In this paper...
Conference Paper
Full-text available
A workbench for intrinsic evolution of digital circuits is presented, based on a Cartesian Genetic Programming algorithm running on a personal computer and a reconfigurable platform suitable for run-time reconfiguration. Two types of Cartesian cell structures are proposed, based on a cylindrical interconnection grid. In addition to a feed-forward n...
Article
We evaluate the performance of a hardware/software architecture designed to perform a wide range of fast image processing tasks. The system architecture is based on hardware featuring a Field Programmable Gate Array (FPGA) co-processor and a host computer. A LabVIEW™ host application controlling a frame grabber and an industrial camera is used to c...
Conference Paper
In this brief, the design and the experimental behavior of a memristor emulator is presented. An npn and a pnp transistor control the switching transition to the low resistance state in forward and reverse input bias, while a capacitor is responsible for the hysteresis loop. The circuit does not need external bias and in this sense it operates in a...
Article
Full-text available
Robots have become a popular educational tool in secondary education, introducing scientific, technological, engineering and mathematical concepts to students all around the globe. In this paper EUROPA, an extensible, open software and open hardware robotic platform is presented focusing on teaching physics, sensors, data acquisition and robotics....
Article
Scale-Invariant Feature Transform (SIFT) has been considered as one of the more robust techniques for the detection and matching of image features. However, SIFT is computationally demanding and it is rarely used when real time operation is required. In this paper, a complete FPGA architecture for feature matching in consecutive video frames is pro...
Conference Paper
RANSAC is a popular and robust fitting algorithm. In the field of image processing, RANSAC can be successfully used to reject false correspondences between similar images. Due to its iterative nature, RANSAC is computationally demanding and time consuming. When the target application operates in real-time, conventional approaches based on personal...
Article
Full-text available
In this work, a Cartesian Genetic Programming (CGP) method is presented for the evolutionary synthesis of optimal digital circuits. In this evolutionary method, circuits are represented as directed graphs in the form of an MxN Cartesian grid. Evolved circuits are qualified using a fast custom emulator of digital circuits that was built to serve as...
Conference Paper
A microcontroller-based AC voltage regulator for single-phase induction motors, using asymmetrical pulse width modulation (PWM) and fuzzy logic is proposed. The optimal switching angles are computed in real-time, using a nine-rule fuzzy system, with the objective to correct the phase difference between the output voltage and current. The voltage co...
Article
Full-text available
The implementation of an advanced real-time, low cost video processing platform capable of supporting a variety of demanding robotic applications is presented. The system is designed as an open project, accessible in full detail and has the potential to grow. It is based on a FPGA plus MCU architecture, allowing the implementation of combined fixed...
Conference Paper
Full-text available
This work presents an intrinsic implementation of Evolvable Hardware, for evolving optimal digital combinatorial circuits. The evolutionary optimization is performed by an enhanced Genetic Algorithm that works on binary encodings of solutions. Potential circuits are built and evaluated on a reconfigurable Cartesian hyper-structure that is pre-confi...
Conference Paper
A new design for an intelligent soft-start embedded controller for low-voltage three-phase induction motors is presented. The design is based on timer-driven semiconductor switching logic and on a four-rule fuzzy system, all implemented on a low-cost microcontroller. Inductive behavior is well-balanced using voltage sensing closed-loop, providing i...
Conference Paper
In this work, a new approach is presented for evolving optimal digital circuits automatically, using a specific implementation of Evolutionary Algorithms called Cartesian Genetic Programming (CGP). The CGP approach uses an MxN grid of forward interconnected logic gates that is genetically evolved and evaluated through a custom digital circuit emula...
Article
Full-text available
An “electronic nose” based on a low-cost Metal-Oxide sensor-array is developed and tested for the detection of Volatile Organic Compounds (VOCs) of samples of ascomycete Tuber or truffle. Truffles have highly appreciated gastronomical and nutritive merits and they own a variable characteristic aroma depending on their stage of maturation and specie...
Conference Paper
In this work, a new approach is presented for automatically evolving optimal digital circuits using a specific implementation of Evolutionary Algorithms called Cartesian Genetic Programming (CGP). This CGP approach uses an MxN grid of forward interconnected logic gates that is genetically evolved and evaluated through a custom digital circuit emula...
Conference Paper
Full-text available
This work presents a method for simulating asynchronous digital circuits, of both combinational and sequential logic, at the gate level. The simulator is going to serve as a fitness function of an Evolutionary Algorithm that will be used for optimal synthesis of digital circuits. Therefore the simulator needs to be simple, fast and reliable. The ci...
Conference Paper
A new architecture for the real-time detection of scale-invariant features in image sequences is presented. The system is based on a low-cost smart-camera custom board, developed to target robotic vision applications. Several optimizations of the SIFT detection procedure are proposed in order to achieve robust keypoint detection with high repeatabi...
Conference Paper
High-resolution scale-space scanning is introduced as a feature-probing technique in difference-of-Gaussian detectors. Scans of the feature response are produced versus scale-space parameter σ for different window sizes, for a set of diverse images. Mean repeatability scans are used to select the filter parameters of a reliable Scale-Invariant Feat...
Conference Paper
Full-text available
An “electronic nose” based on a low-cost array of gas-sensors is developed and tested for the detection of Volatile Organic Compounds (VOCs) emanated from samples of the ascomecyte Tuber or truffle. These fungi have highly appreciated gastronomical and nutritive merits and they own a variable characteristic aroma depending on their stage of maturat...
Conference Paper
Full-text available
The hardware/software implementation of a custom vision board using minimal resources out of a reconfigurable platform is described. Demanding robotic vision applications in most cases require dedicated hardware for reliable operation. The designed system is based on a Cyclone IV Altera FPGA device that constitutes the main processing unit of the r...
Article
A stereo vision algorithm suitable for fast dense stereo matching is proposed. This method extracts areas of uniform disparity or dense disparity features by testing candidate disparity estimates and classifying pixels according to a matching error. By commencing with a rigorous error threshold, pixels of reliable disparity values are identified. A...
Conference Paper
A stereo vision algorithm suitable for fast dense stereo matching is proposed. This method extracts areas of uniform disparity or dense disparity features by testing candidate disparity estimates and classifying pixels according to a matching error. By commencing with a rigorous error threshold, pixels of reliable disparity values are identified. A...
Article
A new real-time stereo system is presented based on a hardware implementation of an efficient Dynamic Programming algorithm. A simple state-machine calculates the cost-matrix along the diagonal of the 2-D disparity space for each epipolar pair of image scan-lines. Minimum transition costs are stored in embedded RAM and are used to backtrack dispari...
Conference Paper
Full-text available
In this paper a new stereo vision method is presented that combines the use of a lightness-invariant pixel dissimilar- ity measure within a dynamic programming depth estimation framework. This method uses concepts such as the proper projection of the HSL colorspace for lightness tolerance, as well as the Gestalt-based adaptive support weight aggreg...
Article
We study the hydrogen-induced passivation of interface traps in n-GaAs:Si, grown by MBE at 580°C, with a buffer layer grown at 200 to 250°C (LT-buffer). In the as-grown samples, the LT-buffer contains As-precipitates, with a density of 4×1016 cm−3 and a diameter that depends on the LT-buffer growth temperature and takes values in the range 4–8nm. T...
Article
Full-text available
A reconfigurable architecture for dense stereo is presented as an observation framework for a real-time implementation of the simultaneous localization and mapping problem in robotics. The reconfigurable sensor detects point features from stereo image pairs to use at the measurement update stage of the procedure. The main hardware blocks are a dens...
Conference Paper
A hardware-friendly procedure is presented for the extraction of point-features from stereo image pairs for the purpose of real-time robot motion estimation and 3-D environmental mapping. The procedure is implemented in reconfigurable hardware and is developed as a set of custom HDL library components ready for integration in a system-on-a-programm...
Article
The nonlinear behaviour of an R–L-Varactor circuit, simulated by Multisim 7.0 at a driving frequency that is below the circuit resonance frequency, is reported and evaluated. A new high amplitude oscillation is observed and attributed to the emergence of a large diode junction capacitance. Increasing the driving signal amplitude, the circuit is led...
Article
Full-text available
The processing results of two stereo accelerators implemented in reconfigurable hardware are presented. The first system implements a local method to find correspondences, the sum of absolute differences, while the second uses a global approach based on dynamic programming. The basic design principles of the two systems are presented and the system...
Article
Full-text available
The design of a hardware co-processor for stereo depth detection, based on a parallel implementation of the sum of absolute differences algorithm, is presented. Model-based designs are followed, and a parameterisable open source VHDL library component appropriate for integration within a system-on-a- programmable chip is created. We target a field...
Article
Full-text available
This paper presents basic design principles for hardware implementation of a two-pass stereo-matching algorithm based on dynamic programming. For the first-pass a state-machine is proposed for the recursive calculation of the cost-function. The state-machine works along the diagonal of a 2-D disparity space for each epipolar pair of image scan-line...
Article
Full-text available
In this paper we present the chaotic state of a LED as a diode element in a non linear LRD. Multisim is used to simulate the circuit and show the presence of chaos. Time series analysis performed by the method proposed by Grasberger and Procaccia. The correlation and minimum embedding dimension ? and m respectively were calculated. Also the corresp...
Article
The optimization of optoelectronic properties of Al/a-SiC:H Schottky diodes grown as Al/a-SiC:H/c-Si(n) structures is studied by means of thermal annealing of a-SiC:H thin films. According to the spectral response of the Schottky diodes the measured quantum efficiency, ηmeasured, increases with increasing annealing temperature (400–600 °C), whereas...
Conference Paper
Full-text available
A general system architecture for fast image processing, based on a field programmable gate array (FPGA) co-processor and a host computer, is presented and evaluated. Images are transferred to the FPGA board via a high speed USB2.0 channel, implemented with a standard macrocell. A LabVIEW host application controlling a frame grabber and an industri...
Article
The present work reports on the optimization of the electrical properties of Al/a-SiC:H Schottky diodes by means of thermal annealing of a-SiC:H thin films. Optical transmission experiments have shown that the optical properties of the films are affected by thermal annealing when Ta>600°C, due to emission of hydrogen bonded to silicon. Although the...
Article
Full-text available
The microstructure of GaN films grown by electron cyclotron resonance (ECR) molecular-beam epitaxy (MBE) and hydride vapor-phase epitaxy (HVPE) is studied using x-ray-absorption measurements at the N K edge. The local microstructure around the N atom is found to be distorted. The nearest neighbors of the N atom are four Ga atoms, N1 of which are lo...
Article
The effect of ex-situ hydrogenation on the bulk and surface properties of amorphous SiC (α-SiC) thin films has been investigated using a number of bulk- and surface-sensitive characterisation techniques. The diffusion coefficient of deuterium in α-SiC is found to be equal to 3–4 × 10−15 cm2 s−1. It is shown that atomic hydrogen causes drastic chang...
Article
The effect of ex-situ hydrogenation on the bulk and surface properties of amorphous SiC (alpha-SiC) thin films has been investigated using a number of bulk-and surface-sensitive characterisation techniques. The diffusion coefficient of deuterium in alpha-SiC is found to be equal to 3-4 x 10(-15) cm(2) s(-1). It is shown that atomic hydrogen causes...
Article
The optical properties of the layered compound SnS2 have been studied. Reflectivity spectra were measured at room temperature, in the energy region 1.8–5.6 eV. Optical transmission measurements were carried out in the temperature range 13–300 K, in order to evaluate the energy gaps and their temperature dependences. The spectra of the optical const...
Article
A study of the optical properties of the layered compound SnSe2 is presented. Reflectivity spectra were measured at room temperature, in the energy region 1.5–5.6 eV. Optical transmission measurements were measured in the temperature range 13–300 K. A structure attributed to excitonic absorption was observed and the temperature dependence of the br...
Article
Full-text available
Absorption and photoconductivity spectra of thin TlGaS2 layers are used to study the fundamental and other transitions of TlGaS2 in the energy region 1.0–3.0 eV and in the temperature range 10–300 K. One of the peaks resolved by photoconductivity measurements corresponds to the excitonic peak registered in the absorption spectrum of this compound....
Article
The optical properties of alpha-SiC before and after ex-situ hydrogenation have been investigated by absorption-, reflectivity- and ellipsometric measurements in the energy range 1.5eV < hv < 24eV. Unlike for in-situ hydrogenated SiC films drastic changes in the dielectric function were observed, which can be explained by the formation of a surface...
Article
We present a study of surface modifications induced in a-SiC thin films grown by sputtering and subjected to ex-situ hydrogenation in a radiofrequency hydrogen glow discharge. Measurements of X-ray photoelectron spectroscopy, optical reflectivity and X-Ray diffraction lead to the conclusion that atomic hydrogen causes preferential etching of silico...
Article
Full-text available
Absorption spectra of thin layers of TlGaSe2 crystals are used to study the energy gap and the interband transitions of the compound in the energy region 1.5–3.8 eV and in the temperature range 12–290K. A peak of excitonic origin appears at 2.39 eV at 12 K, 0.3 eV above the fundamental direct gap. It is followed by two sharp structures at 2.49 eV a...
Article
The X-ray photoelectron spectroscopy (XPS) characterization of an ex-situ hydrogenated amorphous SiC film shows the following main features for the as-received specimen: (1) carbidic Si2p and C1s states with binding energies (BE) 100.4 ± 0.1 and 282.9 ± 0.1 eV respectively, (2) oxidic Si2p and O1s states with BE 103.2 ± 0.1 and 531.9 ± 0.1 eV respe...
Article
Full-text available
We study the transition from a spiral to a double-scroll attractor in a canonical circuit realization of a third-order electrical circuit (Chua circuit) family as a control parameter pc (capacitance, C2) is varied. A sudden widening of the chaotic attractor is observed during this transition, meaning a crisis-induced intermittency. The dependence o...
Article
A characteristic feature of the Si(111) (√3 × √3)R30°-Au surface is an intrinsically high density of domain walls. Combining the complementary strengths of scanning tunneling microscopy and X-ray standing waves it was possible to resolve the atomic structure of the domain walls and the Si(111) (√3 × √3)R30°-Au domains. A detailed structural model f...
Article
A study of the optical properties of the layered compound TlInS2 is presented. Reflection spectra were measured at room temperature, in the energy region 1.5–6.2 eV. Transmission spectra were measured in the temperature range 10–290 K, in the energy region 1.5–3.5 eV. Two structures, at energy positions 2.58 and 2.87 eV (10 K), are attributed to tr...
Article
Full-text available
The electrical behavior of the TlInTe2 ternary semiconductor is studied in the negative-differential-resistance region of its S-type I-V characteristic. Self-excited voltage oscillations in this region, with an amplitude of about 5 V were monitored at temperatures above 70 K. An analysis of the dynamic behavior of these oscillations by means of the...
Article
In this work, the optical transmission and reflection of alpha-SiC:H thin films, grown by rf sputtering, are studied. The absorption coefficient is found. The real (ε1) and the imaginary (ε2) part of the dielectric function are determined by means of ellipsometric measurements, in the region 1.5-6.3 eV. The dependence of ε1 and ε2 on substrate temp...
Article
Full-text available
The electrical conductivity of V2O5 was studied in the temperature range 200-300 K. The measured I-U characteristics in this range are S shaped, consisting of a linear, Ohmic regime at lower current densities and a nonlinear one at higher current densities. lnσ-vs-(103/T) curves recorded in the Ohmic regime of the corresponding I-U characteristics...
Article
Transmission measurements of the layered compound GaSe lead to the determination of the absorption coefficient in the region 3-4 eV and in the temperature range 10-290 K. The dependence of the E1, E1+Delta1, and E3 critical-point energies on the temperature is obtained. The structures were analyzed by fitting the second-derivative spectra d2ε2/dome...
Article
Zn2In2S5(II) single crystals were synthesised by vapour transport reaction and characterised by means of X-ray diffraction and electron microscopy. Transmission spectra were used for the evaluation of the energy gap in the temperature range 10-340 K. The electrical behaviour of the material was examined. Measurements of the n-type electrical conduc...
Article
Thin layers of Zn3In2S6 and Zn5In2S8 laminated compounds are used to obtain interference modulated transmission spectra at normal incidence with unpolarized light. An analysis based on the use of the extremes of the fringes in the transparent region is applied in order to determine the real and imaginary parts of the refractive index, as well as th...
Article
Thin layers of Zn//3In//2S//6 and Zn//5In//2S//8 laminated compounds are used to obtain interference modulated transmission spectra at normal incidence with unpolarized light. An analysis based on the use of the extremes of the fringes in the transparent region is applied in order to determine the real and imaginary parts of the refractive index, a...
Article
In this work an investigation of the electron traps involved in ${\mathrm{Ga}}_{2/3}$${\mathrm{PS}}_{3}$ about 0.55 and 0.90 eV below its conduction-band minimum is presented. Particularly, their energy position, concentration, degree of compensation, and influence on the electrical conductivity of ${\mathrm{Ga}}_{2/3}$${\mathrm{PS}}_{3}$ are studi...
Article
Zn5In2S8 has been synthesized in the form of single hexagonal platelets. This compound is the fifth member of the layered semiconductor family ZnxIn2S3+x. Optical measurements are used for the evaluation of the energy gap at room temperature. This was found equal to 2.84 eV. The presence of extended composition faults was indicated by the a2-hv dia...
Article
Single crystals of the pseudobinary system TlBi(TexSe1−x)2 are grown by the Bridgman-Stockbarger method. Five members of the system (x = 0, 0.25, 0.5, 0.75, and 1) are examined and structural investigations are carried out by X-ray diffraction. By preliminary studies of transport and optical properties the pseudobinary solid solutions are character...

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Project (1)
Project
In this project we study a secure digital system able to transmit cryptographic information based on a chaotic map sequence. The information can be reproduced at the receiver side by synchronizing the chaotic maps. The production of the cipher key is designed to pass the NIST tests and can be easily implemented on special as well as general puprose processors.