Gintautas Daunys

Gintautas Daunys
Vilnius University · Regional Development Institute

Doctor of Science

About

54
Publications
14,382
Reads
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407
Citations
Additional affiliations
September 2016 - present
Šiauliai University
Position
  • Professor (Full)
February 2015 - September 2016
Šiauliai University
Position
  • Professor (Full)
October 2011 - January 2015
Šiauliai University
Position
  • Professor (Full), Head of Department

Publications

Publications (54)
Article
Full-text available
Airborne allergenic pollen affects a significant part of the population and the information on pollen load is a valuable tool for public health prevention. The messages should be provided in a form easily understandable for the population. The study provides new insight for the categorisation of pollen load by defining thresholds solely from aerobi...
Article
Full-text available
Technological progress in modern scientific development generates opportunities that create new ways to learn more about objects and systems of nature. An important indicator in choosing research methods is not only accuracy but also the time and human resources required to achieve results. This research demonstrates the possibilities of using an a...
Article
Full-text available
Automatically operating particle detection devices generate valuable data, but their use in routine aerobiology needs to be harmonized. The growing network of researchers using automatic pollen detectors has the challenge to develop new data processing systems, best suited for identification of pollen or spore from bioaerosol data obtained near-rea...
Article
Full-text available
Alnus glutinosa is an important woody plant in Lithuanian forest ecosystems. Knowledge of fluorescence properties of black alder pollen is necessary for scientific and practical purposes. By the results of the study, we aimed to evaluate possibilities of identifying Alnus glutinosa pollen fluorescence properties by modeling ozone effect and applyin...
Experiment Findings
Dataset acquired from Rapid-E device by testing it with anemophilous woody plants pollen collected in Lithuania. Data is sorted by pollen type. https://zenodo.org/record/3403792#.XbH9Dej7Q2w The sampling methodology can be found in publication "Automatic pollen recognition with the Rapid-E particle counter: the first-level procedure, experience a...
Preprint
Alnus glutinosa is important woody plant in Lithuanian forest ecosystems. Knowledge of fluorescence properties of black alder pollen is necessary for scientific and practical purposes. By the results of the study we aimed to evaluate possibilities of identifying Alnus glutinosa pollen fluorescence properties by modeling ozone effect and applying tw...
Article
Full-text available
Pollen-induced allergies are among the most prevalent non-contagious diseases, with about a quarter of the European population being sensitive to various atmospheric bioaerosols. In most European countries, pollen information is based on a weekly-cycle Hirst-type pollen trap method. This method is labour-intensive and requires narrow specialized ab...
Article
Full-text available
Pollen-induced allergy is among the most-prevalent non-contagious diseases, with about a quarter of European population sensitive to various atmospheric bioaerosols. In most European countries, pollen information is based on a weekly-cycle Hirst-type pollen trap method. This method is labour-intensive, requires narrow specialization abilities and s...
Article
Full-text available
Autonomous navigation of a robot in an unknown environment is still a challenge for engineers. This paper deals with a simple method for detecting obstacles in a robot’s way and stairs in multi-storey buildings. As there may be low light conditions, a structured light-based approach was chosen. A mathematical model was developed to describe the for...
Patent
Full-text available
The invention relates to a device for rehabilitating and/or causing binocular motivity through sensory stimulation of a patient, said device including a planar stand (10) that is defined by a longitudinal axis of symmetry (AA′), the stand (10) including a plurality of means for transmitting at least one sensory stimulus, said transmission means inc...
Article
Full-text available
Image processing, computer vision or other complicated opticalinformation processing algorithms require large resources. It isoften desired to execute algorithms in real time. It is hard tofulfill such requirements with single CPU processor. NVidiaproposed CUDA technology enables programmer to use theGPU resources in the computer. Current research...
Article
Full-text available
Image processing, computer vision or other complicated opticalinformation processing algorithms require large resources. It isoften desired to execute algorithms in real time. It is hard tofulfill such requirements with single CPU processor. NVidiaproposed CUDA technology enables programmer to use theGPU resources in the computer. Current research...
Article
This study analyzes possibilities of laser and ultrasound scanning as well as computer vision to recognize a first stair of the stairs construction. Three methods were proposed for the purpose. A mathematical model for stair recognition by ragefinder scanning was proposed. The methods were examined experimentally. It was obtained that method of ult...
Article
In this paper head position locating systems were analyzed. There were reviewed scientific articles with different proposed methods. The chosen system is with the camera located on the user head. The main parameters of the head positioning systems were analyzed. The procedure laid down in what order parameters are found. The diagram of the system a...
Article
The research examined the use of field programmable gate arrays (FPGA) in image filtering. Experimental and theoretical researches were reviewed. Experiments with Cyclone III family FPGA chip with implemented NIOS II soft processor were considered. Image filtering was achieved with symmetrical and asymmetrical finite impulse response filters with c...
Chapter
Designing an eye tracker involves choosing the most appropriate hardware components. A variety of hardware components are available for building an eye tracker, but it is not obvious which ones are the most appropriate. The common factors to consider are: sensitivity to low light, conditions, camera speed, camera fidelity, weight, the working dista...
Article
Full-text available
Different image magnification methods are related very close with each other except the simplest Box method that does not use any interpolation. All tested methods show about the same RMSE results for the same picture. Lanczos methods show the best results and simplest Box method shows the worst results. Statistically, difference between interpolat...
Chapter
Designing an eye tracker involves choosing the most appropriate hardware components. A variety of hardware components are available for building an eye tracker, but it is not obvious which ones are the most appropriate. The common factors to consider are: sensitivity to low light, conditions, camera speed, camera fidelity, weight, the working dista...
Article
Full-text available
The purpose of this research was to investigate quantitatively the catch-up saccades occurring during smooth pursuit. In our experiment, to evoke catch-up saccades we used two-dimensional non-predictable time-continuous target trajectories submitted with 3 peak velocities: 12.5, 25 and 50deg/s. From the experimental results we computed the relation...
Article
This paper presents a principled analysis of various combinations of image features to determine their suitability for remote eye tracking. It begins by reviewing the basic theory underlying the connection between eye image and gaze direction. Then a set of approaches is proposed based on different combinations of well-known features and their beha...
Article
Full-text available
A vocal tract can be described using the serially connected electrical circuits of T-type. Its frequency response was obtained by two ways: simulation of the signal and later calculation of the spectrum, and calculation of frequency response of serially connected two-ports. In the first case, a mathematical model of the acoustic tube was built usin...
Article
Binocular yoking of saccades is essential for single vision of words during reading. This study examines the quality of binocular coordination in individuals with dyslexia, independent of the process of reading. Fifteen dyslexia children (11.2+/-1.4 years) and 15 non-dyslexia individuals (8 children, aged 11.1+/-1.3 years, and 7 adults, 24+/-3 year...
Conference Paper
Full-text available
An inexpensive sonification system of maps and charts for visually impaired is described. A digitiser (tablet) is used as systems input device, which helps to investigate the map. The maps are presented using xml technology – mainly svg language tags. Then the maps from svg are converted to RGB bitmap A system software is based on Microsoft .NET te...
Article
Full-text available
Franklin et al (1993, Leonardo26 103–108) reported that title information influenced the interpretation of paintings but not the way observers explore and look at the paintings; in their study subjects used a hand pointer to indicate where they looked. We used eye-movement recording and examined the effect of title on eye-movement exploration of no...
Chapter
Full-text available
The differences of visual and auditory systems are pointed by Brewster (Brewster, 2002). Our visual system gives us detailed information about a small area of focus whereas our auditory system provides general information from all around, alerting us to things outside. Visual system has a good spatial resolution, while auditory system has preferenc...
Conference Paper
Exact calibration in real time is critical for gaze control systems. Five different calibration techniques were investigated: a standard calibration using linear and second order models (9 and 25 points); 2D mapping with interpolation; a mapping with developed model, describing eye image formation process. Results show that there is no significant...
Article
Full-text available
This study tests the influence of transcranial magnetic stimulation (TMS) of the posterior parietal cortex (PPC) on the initiation of horizontal and vertical saccades, alone or combined with a predictable divergence. A gap paradigm was used; TMS was applied 100 ms after target onset. TMS of the left PPC increased the latency of unpredictable rightw...
Article
Full-text available
In real life, divergence is frequently combined with vertical saccades. The purpose of this study was to examine the initiation of vertical and horizontal saccades, pure or combined with divergence. We used a gap paradigm to elicit vertical or horizontal saccades (10 degrees), pure or combined with a predictable divergence (10 degrees). Eye movemen...
Article
Full-text available
Human ocular saccades are not perfectly yoked; the origin of this disconjugacy (muscular versus central) remains controversial. The purpose of this study was to test a cortical influence on the binocular coordination of saccades. The authors used a gap paradigm to elicit vertical or horizontal saccades of 10 degrees , randomly interleaved; transcra...
Article
Full-text available
Evaluation of hand pointing system is presented. The system is based on 3D computer vision and implemented using open source computer vision library (OpenCV). The system is able to detect and track user's head and hand and return 3D coordinates in real time. The detection of head and hand is based on Viola-Jones detector applying human skin color m...
Article
Full-text available
Historically the electronics manufacturing market has relied on a combination of human visual inspection and electrical test methods to ensure product quality. With the advent of the personal computer, the use of "machine vision" in industrial applications gradually became more common. The process where optical sensors (i.e., cameras) are used to m...
Article
Full-text available
The method of minimization face expression influence for evaluation of head orientation in space is proposed and investigated. In our previous works 18 characteristic face points were selected for the head orientation evaluation. It is difficult to track all 18 points in real time. It was found by way of mathematical simulation that number of point...
Article
Full-text available
The analysis of spectral formant movement of Lithuanian vowels was carried out. More frequently used words with different surrounding of sounds "a", "e", "e", "i", "o", "u" were selected for investigation. Praat program was used for words annotation into phonemes and obtaining values of formants. The movement of formants was approximated by other s...
Conference Paper
Full-text available
Presentation of graphical information is key problem during teaching of visually impaired children. The developed system is devoted for investigation of graphical information by blind user using a digitiser. SVG language with additional elements is used for describing of maps. Non-speech sounds are used to transfer information about colour. Alertin...
Conference Paper
Exact calibration in real time is critical for gaze control systems. Usually measurements are mapped to points on screen using coefficients obtained from calibration data. The mathematical model of pupil centre/ eye corner gaze tracking system was proposed. 6 parameters were used to describe both eyes movement on image sensor. Experimental results...
Article
This study explored in humans the role of the posterior parietal cortex (PPC) in saccades, vergence, and combined saccade-vergence movements by means of transcranial magnetic stimulation (TMS). TMS was applied to the right PPC at 80 ms, 90 ms, or 100 ms after target onset in experiment 1, and to the left PPC in experiment 2. Control experiments wer...
Article
This study examines the effects of TMS of the right PPC on the latency of saccades and vergence alone or combined and the role of experimental design. Two designs were used: pure blocks with exclusively no-TMS or TMS trials; mixed blocks in which no-TMS and TMS trials were interleaved; a control study with TMS of the primary motor cortex (pure bloc...
Article
To explore the 3D visual environment most frequently we make combined saccade-vergence eye movements. We studied the effect of transcranial magnetic stimulation (TMS) of the right posterior parietal cortex (rPPC) on such combined eye movements versus isolated saccade and vergence. In the main experiment, TMS was applied on the rPPC 80, 90 or 100 ms...
Article
Full-text available
To explore visual space, we make saccades, vergence, and, most frequently, combined saccade-vergence eye movements. The initiation of saccades is well studied, while that of vergence is less explored. Saccade latency is influenced by the fixation task: when the target appears simultaneously with the offset of the fixation point, latencies tend to b...
Conference Paper
Eyegaze is one of an alternative input methods. Nowadays, the videoculography (VOG) is the most suitable for this purpose. Eye pupil center position is necessary for evaluation of gaze direction. The novel pupil center co-ordinates extraction method was proposed. The method exploits averaging of pupil edge co-ordinates in the same scan line. Obtain...
Article
The goal of this study was to examine vertical disconjugate learning based on memorization of vertical disparity at a viewing distance of 70 cm; such a distance is common in many visual ergonomic conditions, including car driving. For a period of 15 min, eight subjects made downward saccades to a memorized target. The target was rendered disparate...
Article
This study focus on the features of the prediction mechanism of the smooth pursuit eye movements during two dimensional target motion. Due to better perception of target trajectory prediction of the two dimensional target motion is more obvious than in one dimensional situation. Best results of prediction are obtained for target velocities 20-30 de...
Conference Paper
Full-text available
Presentation of graphical information is very important for blind. This information will help blind better understand surrounding world. The developed system is devoted for investigation of graphical information by blind user using a digitiser. SVG language with additional elements is used for describing of maps. Non-speech sounds are used to trans...
Article
Full-text available
Įvadas Šnekos atpažinimo technologijos ateityje turėtų vaidinti svarbų vaidmenį žmogaus ir kompiuterio sąveikoje. Šiuo metu šnekai atpažinti daugiausia yra naudojamas vien tik garso signalas, kurio analizei taikomas paslėptųjų Markovo modelių metodas. Iš pasaulinės praktikos aiškėja, kad atpažinimo šiuo metodu tikslumas nebedidėja, nors ir dedama d...

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Cited By

Projects

Projects (6)
Project
The overall goal is to develop a digital airborne allergenic pollen identification library for real-time measurements in the Baltic Sea region and integrate data to the cutting-edge pollen forecasting model. The objective is to create algorithms for a digital library of real-time pollen recognition and to create an innovative approach for the pollen fore- and hind-casting.
Project
The aim of PASYFO is to provide a high-resolution regional system for predicting the personal allergy symptoms of pollen-sensitive people using personalised sensitivity information.