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1
Content available remote

Research and Parameter Optimization of the Pattern Recognition Algorithm for the Eye Tracking Infrared Sensor

100%
Murawski K., Różanowski K., Krej M.
Acta Physica Polonica A
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2013
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vol. 124
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issue 3
513-516
EN
The paper presents the process and results of tests of the pattern recognition algorithm. The algorithm has been developed for the sensor to track the activity of the eyes. The study was conducted on a group of ten people. The group was selected, so that it was possible to determine the influence of gender, age, eye color, contact lenses and glasses on the result of the algorithm. The object of the study was also to optimize the pattern recognition algorithm in terms of CPU utilization. For this purpose the duration of the algorithm steps were measured as a function of the allocation of tasks to multiple processor cores.
2
Content available remote

Determination of Radiation Shielding Properties of Fabrics using Image Processing Method

100%
Kilinçarslan Ş., Üncü İ., Akkurt İ., Günoğlu K., Akarslan F., Coşkunsu S.
Acta Physica Polonica A
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2017
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vol. 132
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issue 3
1171-1172
EN
It is extremely important to protect the human body from radioactive rays. Protective clothing can be used to absorb radiation because it is preferable to avoid the natural and artificial radiation exposure in our daily lives. There are many different types of fabric, used for clothes. In this study radiation absorbing properties of fabrics, which are widely used in the daily life, such as alpaca-type fabric, cotton fabric, cotton polyester blend fabric, woven dyed fabric and knitted fabric were examined using the image processing method.
3
Content available remote

Multifunctional, Optical Sensor for Analysis of Dynamic Pupillary Light Reflex

80%
Różanowski K., Lewandowski J., Murawski K.
Acta Physica Polonica A
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2015
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vol. 127
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issue 3
723-729
EN
The aim of the publication is to describe the multifunctional optical sensor for analysis of dynamic pupillary light reflex developed by the authors which could be used as an objective indicator of human fatigue. The authors utilized knowledge gained from past experimental studies to develop a sensor, which along with custom software for detection of parameters of dynamic pupillary reflex provides a quick analysis of the human psychophysiological condition. Furthermore, the obtained parameters may also be utilized for medical purposes. The authors present the results of pilot studies prior to the development process of the sensory solution. The obtained result show that the type of light stimulation of the retina has a significant impact on the dynamic parameters of the pupillary reflex. The results played also an important role in shaping the structural assumptions of the sensor, so that it can serve as an indicator of the human fatigue level. The article includes results of experimental research conducted during the testing process of the sensor using various parameters of frequency light excitations, luminance and chrominance.
4
Content available remote

Method of Measuring the Distance to an Object Based on One Shot Obtained from a Motionless Camera with a Fixed-Focus Lens

80%
Murawski K.
Acta Physica Polonica A
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2015
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vol. 127
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issue 6
1591-1596
EN
The paper presents the method of measuring the distance to the object based on digital image processing. The solution is characterized in that the distance measurement to the object is performed by a motionless camera with established and unchanged parameters during measurement. The camera is equipped with a one non-stereoscopic lens. The measured distance is determined on the basis of one view of an object presented on one image. The image is made at a constant and invariant setting of the optical path such as: focus, aperture and focal length.
5
Content available remote

Optical Sensor to Monitor Pupillary Light Reflex

80%
Różanowski K., Murawski K.
Acta Physica Polonica A
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2013
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vol. 124
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issue 3
558-562
EN
The aim of the paper is to describe design of an optical sensor intended to analyze pupillary light reflex. It also presents the results of physiological adaptation mechanisms in human eye, i.e. response of the iris to changes in the intensity of light that falls on the retina of the eye under conditions of sensory deprivation. Pupillary light reflex is a closed loop nerve reflex. It controls the amount of light that reaches the retina. Based on the test results, an optical sensor was designed, fabricated and correctly calibrated. In comparative tests with the use of F^2D Fit-For-Duty, a commercial system by AMTech, selected pupillographic parameters were primarily evaluated (baseline pupil diameter, oscillations, reflex latency, maximum reaction time, pupil constriction time, pupil dilation time, and constriction amplitude) under conditions of diminished alertness, reduced ability to concentrate, increasing fatigue, and drowsiness. The solution comes as part of a mobile pupillography device intended to be assembled in cars and airplanes to identify conditions of lower alertness, reduced ability to concentrate, increasing fatigue and drowsiness in drivers, pilots and traffic controllers, and to trigger alarm and preventive measures, if necessary.
6
Content available remote

A Study on Performance Effects of Standard and Stabilized He-Ne Lasers in an Interferometric Measurement System

80%
Böcekçi V.
Acta Physica Polonica A
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2016
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vol. 129
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issue 4
810-812
EN
Stabilized He-Ne lasers are commonly utilized in interferometric systems, and provide easy and accurate results. The main reason for their extensive use is their output beam's strength and stability. However, these are relatively high in cost. In interferometric measurement systems, standard He-Ne lasers can also be used. This type of lasers has a lower cost, but their output beam strength can fluctuate in time. And this in turn adversely affects the measurement performance. In this study, a standard He-Ne and a stabilized He-Ne lasers were used in the same measurement system. The measurement errors caused by the fluctuation of the output beam of the standard He-Ne laser are minimized by using a video processing technique. When the obtained results were compared with the ideal values, the relative error for the system with the stabilized He-Ne laser was recorded as 0.2%, while for the system with the standard He-Ne laser a relative error rate of 0.3% was achieved. When the results are analyzed, it is evident that in measurement systems with a standard He-Ne laser, the system performance can be boosted with a video processing technique, and that its results can achieve values closer to the performance of stabilized He-Ne lasers.
7
Content available remote

Palm Vein Authentication and Verification System

80%
Cömert M., Yildiz A.
Acta Physica Polonica A
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2016
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vol. 130
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issue 1
175-177
EN
In this work, both hardware and software of a palm vein capture system have been designed and a prototype is produced. By using this system, a genuine database was created with age and gender information of volunteered test subjects. Widely used pre-processing, acquisition of feature vectors, and classification methods were tested on the database and results are compared with speed versus accuracy. All the modules used in hardware and software were determined as open source. Python has been chosen as a software module programming on a single board computer with Linux kernel. As a result, an appropriately running system has been built with both secure software and hardware interfaces having maximum accuracy at 95.33% while specificity is at 100%.
8
Content available remote

Utilization of Digital Processing of the Optical Scanning Field View for Tip-Sample Distance Estimation during the Approach Procedure

80%
Sikora A., Bednarz Ł.
Acta Physica Polonica A
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2009
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vol. 116
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issue S
S-99-S-101
EN
In this article we present the method of determining the tip-sample distance using advanced data processing of scanning field's optical picture. This feature can reduce both: the approach process time and the risk of damaging the tip or the sample. Experimental results will be also presented.
9
Content available remote

Off-Axis Electron Holography of Magnetic Nanostructures: Magnetic Behavior of Mn Rich Nanoprecipitates in (Mn,Ga)As System

80%
Barańska M., Dłużewski P., Kret S., Morawiec K., Li T., Sadowski J.
Acta Physica Polonica A
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2017
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vol. 131
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issue 5
1406-1408
EN
The Lorentz off-axis electron holography technique is applied to study the magnetic nature of Mn rich nanoprecipitates in (Mn,Ga)As system. The effectiveness of this technique is demonstrated in detection of the magnetic field even for small nanocrystals having an average size down to 20 nm.
10
Content available remote

CRI and GAI Comparison in LED Light Sources Using Image Processing

80%
Üncü İ., Coşkunsu S., Sönmez C., Biçakçi O.
Acta Physica Polonica A
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2016
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vol. 130
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issue 1
379-381
EN
In this study, color rendering index and gamut area index related to the light quality of a light source are compared. Color rendering index is a measure that demonstrates how much a light source reveals colors in nature. In color rendering index measurements, average of reference colors is taken to obtain an overall measurement value. As to gamut area index measurement, the result is obtained through the field measurement formed by the results of reference colors in the color space.
11
Content available remote

An Improved Method of Linear Travel-Time Interpolation Ray Tracing Algorithm

80%
Hao-Quan W.
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issue 4
521-526
EN
The linear travel-time interpolation algorithm is improved by the method of ray tracing based on finite difference scheme of eikonal equation. It can simulate the more complex medium. Using the algorithm to calculate travel-time and paths of tracing rays, it is more rapid and accurate than the other conventional methods. The linear travel-time interpolation ray tracing algorithm has a drawback: rays cannot go round the low velocity area if the launching point, the receiving point and the low velocity area distribute on the same column (row). Aiming at the drawback, an improved algorithm is proposed on the basis of researching reconstruction theories. The given algorithm adopts a cross-scanning strategy to carry out forward processing and uses discrete points as the secondary sources to simplify backward processing. The numerical simulation experiments show that the rays can go round the low velocity areas located in the same column (row) of the launching points and the receiving points. Rays scan over the global region only once.
12
Content available remote

Michelson Interferometer Based Displacement Measurement Using Video Processing

80%
Bocekci V., Varol H.
Acta Physica Polonica A
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2015
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vol. 127
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issue 4
934-936
EN
In this study, investigation of video processing method which is a new technique for precision displacement measurement is presented. The video processing method was integrated with an interferometric system and the thermal expansion results and linear thermal expansion coefficients of a heated sample metals were compared with theoretical results. Michelson interferometer setup was used in our study due to its advantages in precision displacement information of a visual output, called interferograms. In the experimental studies, signals of interferograms containing displacement information were obtained from the measurement system. The amount of displacement in the sample metals under the temperature variation due to thermal expansion was measured with the analysis program, written in Matlab/Simulink environment, with a micrometer precision. The measured displacement amounts were compared with the results of theoretical calculations. According to the theoretical values, the relative error of the values measured with video processing based method, was found found to be 0.3%
13
Content available remote

New Vision Sensor to Measure and Monitor Gas Pressure

80%
Murawski K.
Acta Physica Polonica A
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2015
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vol. 128
|
issue 1
6-9
EN
The paper presents the construction and the use of a video sensor developed to measure air pressure. A characteristic feature of the device is pressure measurement based on digital image processing and self-diagnostics performed on the basis of an image. The paper presents the results of sensor calibration and measurements taken during the tests. It has been shown that the developed video-manometer model that is equipped with a flat diaphragm allows measuring the air pressure in the range of 0-100 mbar with an error less than 2%.
14
Content available remote

Measurement of Membrane Displacement Using a Motionless Camera

80%
Murawski K.
Acta Physica Polonica A
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2015
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vol. 128
|
issue 1
10-14
EN
The paper presents a technique for measuring membrane displacements with one motionless camera. The method relies on measuring the distance to an object based on one image obtained from a motionless camera with a fixed-focus lens. It is proven that the used technique allows monitoring the frequency and amplitude of vibration. The tests were performed for the oscillation frequency in the range from 0.5 Hz to 6 Hz and deviations from the neutral position in the range of ± 3 mm.
15
Content available remote

Spatial Resolution Test of a Beam Profile Monitoring System for the Double Electrostatic Ion Storage Ring

80%
Das S., Källberg A.
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vol. 125
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issue 1
13-17
EN
A beam profile monitoring system based on the imaging of low energy electrons created when the ion beam impinges on a metal plate was built to monitor the beam profile and to cover the wide range of beam intensities and energies for the DESIREE (Double ElectroStatic Ion Ring ExpEriment) beam line diagnostics. The spatial resolution of the system was tested with different beams of various energies and was found to be around 2 mm. A significant steering effect on the ion beam before hitting the metallic foil was observed at low energies.
16
Content available remote

Unsupervised Method for Building Detection using Gabor Filters

80%
Daamouche A., Fares D., Maalem I., Zemmouri K.
Acta Physica Polonica A
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2016
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vol. 130
|
issue 1
28-29
EN
Automatic methods are a convenient solution to extract buildings from remote sensing images. In this paper, we propose an unsupervised method to extract buildings by means of the Gabor filters and morphological operators. Our proposed method starts from a set of the Gabor filter parameters which is selected empirically to generate a two-dimensional impulse response. The convolution of the impulse response with the image of interest enhances the buildings and attenuates the background. Moreover, morphological operators are applied to further refine the resulting class of interest. The developed algorithm is applied on many remotely sensed images; the obtained results are highly satisfactory and promising.
17
Content available remote

Pattern Recognition Algorithm for Eye Tracker Sensor Video Data Analysis

80%
Murawski K., Różanowski K.
Acta Physica Polonica A
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2013
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vol. 124
|
issue 3
509-512
EN
The aim of the paper is to discuss research conducted at the Military University of Technology as well as the Military Institute of Aviation Medicine. The essence of the research is to develop a pattern recognition algorithm for the analysis of data received from an eye tracker sensor. Data analysis can be done using computer vision algorithms. In the article the state of the art pattern recognition algorithms were presented. Particular attention was paid to the possibilities and limitations of their use. The main part of the paper is the presentation of the author's pattern recognition algorithm. In the paper we have also shown the results obtained by other techniques of image processing, which are frequently used to determine the position of the pupil of the eye on the image.
18
Content available remote

The Effect of Sodium Chloride on the Process of Drying of Porous Media

80%
Fijał-Kirejczyk I., Milczarek J., Jurkowski Z., Żołądek J.
Acta Physica Polonica A
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2013
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vol. 124
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issue 6
1025-1028
EN
The high temperature drying process of corundum cylinders partially saturated with aqueous solutions of sodium chloride was investigated with neutron imaging technique accompanied with mass and temperature measurements. The statistical analysis of neutron images was applied in order to quantify the time evolution of the process. The substantial slowing down of drying with increasing salt concentration was found. This effect was attributed to increase of viscosity of the solution with increasing salt content as well as to the formation of an outer layer of NaCl on the sample surface.
19
Content available remote

Hidden Object Detection System Based on Fusion of THz and VIS Images

80%
Kowalski M., Palka N., Piszczek M., Szustakowski M.
Acta Physica Polonica A
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2013
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vol. 124
|
issue 3
490-493
EN
Terahertz imaging makes it possible to acquire images of objects concealed underneath clothing by measuring the radiometric temperatures of different objects on a human subject. Finding objects hidden under clothes is one of key issues of public places security. A possible solution of this problem is a multispectral, terahertz-based screening system with implemented image fusion algorithm. The result of the fusion is a new image which gives more information and is more suitable for human perception. An imaging system is usually composed of various subsystems. Many of the imaging systems use imaging devices working in various spectral ranges. The aim of our studies is to detect and visualize objects hidden under clothing. Detection of potentially dangerous objects is important, but without proper visualization, can be difficult to utilize. Our goal is to build a system harmless to humans for screening and detection of hidden objects using a THz and VIS cameras. The presented system draws attention not only on the properties offered by a single camera but also on the potential of synergetic effects of the system by using the fusion of data registered by different sensor units. In this paper we present the multispectral passive imaging system for hidden threats visualization based on THz and VIS cameras.
20
Content available remote

Studying Efficiency of NDE Techniques Applied to Composite Materials in Aerospace Applications

71%
Dragan K., Swiderski W.
|
EN
This work presents the modern approach to the detection of various types of defects in composite structures used in aerospace. In such structures, including glass reinforced plastics and carbon reinforced plastics, different failure modes could occur at a manufacturing stage and during service life. Defects are connected with inadequate technology, poor workmanship, cycling fatigue loads, impact damage and environmental conditions. The main types of defects are delaminations, disbonds, foreign object inclusions and porosity. To detect such defects, several non destructive evaluation techniques can be applied, merely to mention ultrasonic, low frequency acoustics, infrared thermography and shearography. The use of multimode non destructive evaluation techniques enables characterization of defects which cannot be detected by using single non destructive evaluation methods. This paper demonstrates the necessity of using non destructive evaluation methods for the implementation of quality control and maintenance procedures while servicing aerospace composite elements.
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