Iztok Kramberger

Iztok Kramberger
University of Maribor | UM · Faculty of Electrical Engineering and Computer Science (FERI)

PhD

About

42
Publications
5,772
Reads
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216
Citations

Publications

Publications (42)
Article
Full-text available
The purpose of this article is to present the use of a previously validated wearable sensor device, Armbeep, in a real-life application, to enhance a tennis player’s training by monitoring and analysis of the time, physiological, movement, and tennis-specific workload and recovery indicators, based on fused sensor data acquired by the wearable sens...
Article
Full-text available
The presented paper describes a hardware-accelerated field programmable gate array (FPGA)–based solution capable of real-time stereo matching for temporal statistical pattern projector systems. Modern 3D measurement systems have seen an increased use of temporal statistical pattern projectors as their active illumination source. The use of temporal...
Book
Gradivo vsebuje navodila za laboratorijske vaje pri pred-metu Elektronski sestavi za ˇstudente druge stopnje magistrskega ˇstudijskega programa Elektrotehnika, smer elektronika, in druge sto-pnje magistrskega ˇstudijskega programa Telekomunikacije. V navodilih je 5 laboratorijskih vaj, ki obravnavajo podatkovne pretvornike ter obdelavo, tvorjenje i...
Chapter
For monitoring the progress of athletes in various sports and disciplines, several different approaches are nowadays available. Recently, miniature wearables have gained popularity for this task due to being lightweight and typically cheaper than other approaches. They can be positioned on the athlete’s body, or in some cases, the devices are incor...
Article
This paper presents a method of binocular visual stimulation for brain–computer interfaces (BCIs) based on steady-state visual evoked potentials (SSVEPs) using phase-coded symbols. The proposed method’s emphasis is on a binocular phase-coded visual stimulus, which is based on the phase differences between the left- and right-eye stimuli, and a symb...
Article
In this paper, a novel balancing circuit is proposed, which is well suited to aerospace electronics, as it allows for the use of off-the-shelf radiation tolerant components. The new design was examined analytically with and without a zero- voltage switching topology. Its performance was compared to other popular battery balancing circuits. Further,...
Article
Full-text available
This paper presents a miniature wearable device and a system for detecting and recording the movement and biometric information of a user during sport activities. The wearable device is designed to be worn on a wrist and can monitor skin temperature and pulse rate. Furthermore it can monitor arm movement and detect gestures using inertial measureme...
Article
This paper presents an approach for implementing radiation protection FDIR (Fault Detection, Isolation and Recovery) techniques designed especially for nanosatellites, capable of ensuring reliable operation in harsh orbits using COTS (Commercial off the Shelf) components. The radiation environment, as encountered by nanosatellites utilizing Flash-b...
Conference Paper
This paper presents work related to tennis stroke detection and classification. For arm movement acquisition a miniature wearable IMU device, positioned on the player's forearm (right above the wrist) is proposed and presented. The device uses a MEMS-based accelerometer and gyroscope with 6-DOF. For reliable and accurate tennis stroke detection the...
Article
This paper describes the implementation of a reliable maximum power point tracking design as an analog circuit for use on a satellite relying on solar power generation within low Earth orbit. The environment in which such a spacecraft system would function is evaluated. A specific maximum power point tracking algorithm is selected with regards to e...
Article
In this article we will present miniaturized optical payloads for 3U CubeSat satellite format. Optical payload consist of imaging unit based on a sensor with a wide spectral response (from Visual to Short Wave Infra-Red). Many small band pass filters (up to 20) can be put in front of the sensor to achieve multispectral imaging with squared sensor....
Article
This paper presents the design of an FPGA-based Communication Stack which is intended for use on nano-satellite space missions. By using it satellite designers can design the nano-satellite using an on-board hot-redundant CAN bus and using additional direct command interfaces. Further, the Communication Stack allows the satellite operator to commun...
Article
Due to the continuously increasing complexities of embedded electronic systems, there is a clear need for more sophisticated methods of testing and evaluating the performances and reliabilities of the embedded software. One such method is to simulate potentially dangerous events, while monitoring the system's response and stability. This paper pres...
Article
Full-text available
This paper describes the architecture of a door phone embedded system with interactive voice response. Because speech technology is not 100% reliable, the emphasis was on parts that have greater impact on overall performance (audio capture, speech recognition and verification, and power consumption). Using an embedded microphone array increases spe...
Article
In this paper we present a general evaluation of image compression algorithms for European Student Moon Orbiter mission for acquiring lunar surface imagery. Evaluations were made on ten different images, processed into various image formats and later reviewed with several objective measurements. As a comparison Set-Partitioning in Hierarchical Tree...
Article
In this paper a preliminary design of newly defined head-mounted device for binocular visual stimuli is presented as part of a electroencephalography framework for non-invasive brain computer interface based on steady state visual evoked potentials. Embedded hardware and software of binocular head-mounted device prototype are presented, while obtai...
Article
Based on the fact that there are many challenging cases of infirm persons, who are able to control only their eye muscles, a low-cost mobile device for electronic eye gesture recognition has been designed as a human-machine interface, which enables the control of different applications and home appliances by user's eye gestures by the IR and Blueto...
Conference Paper
Full-text available
In this paper we describe a low cost embedded system for eye movement tracking that supports disabled persons with basic interaction with Bluetooth enabled electronic devices. The method is based on tracking the EOG potential. The device has a built-in 32-bit RISC processor that performs acquisition of multichannel differential EOG signals and sign...
Article
Full-text available
In this paper we propose an approach to identify logotypes in video stream. Proposed concept is based on feature extraction process which combines contours and color information. Extracted contours from video stream are used to calculate image invariant moments to describe the shape of the logotype. Furthermore color information is extracted from t...
Article
Experimental skin reflectance measurement setup is presented to acquire skin color signals under different illuminant conditions directly by an image sensor. To obtain stimulus of varying illuminant conditions an adjustable RGB light source is used. Skin color modeling is an important step for efficient skin color image segmentation, which plays an...
Article
Edge detection plays an important role in image analysis systems. We present a color selective edge detection technique, which consists of two image processing steps. The first step represents pixel-based color detection and the second progressive block-oriented edge detection. The combination of these two steps defines a selective edge detection t...
Article
Special purpose cameras are generally used in systems for image analysis because of their high quality captured images. But their big drawback is high price, which makes them inaccessible for low cost image analysis systems. In this paper we present a pixel-based method for color image segmentation, focused on segmentation of color images captured...
Article
Skin color can be an important feature when tracking skin-colored objects. Particularly this is the case for computer-vision-based human-computer interfaces (HCI). Humans have a highly developed feeling of space and, therefore, it is reasonable to support this within intelligent HCI, where the importance of augmented reality can be foreseen. Joinin...
Article
On field of measuring of one-way characteristics of semiconductor elements we have always the same methods and procedures. Therefore is automation of those methods and procedures a logical step. There are many solutions in this field. Most of them have a very selected purpose, like measuring only certain semiconductor elements. Our goal was to deve...
Article
Design and implementation of 64-channel spectral analyzer measurement system for ultraviolet spectrum of light is presented. The basic idea was to build a versatile measurement system for spectral analyze in atomic spectroscopy employment using of up-to-date digital and communication solutions. A basic structure and schematic drawing of an atomic s...
Article
In the development of input devices for manipulating virtual environments we wish that input devices are maximally adapted to virtual tasks. Various metrics for estimating adaptation of input devices to virtual tasks on a number of test users have been presented in literature. In this paper we propose a method for quantifying input devices without...
Conference Paper
Systems for virtual and augmented environments need the tracking of head movements, if used with head mounted stereoscopic displays. Such displays contain an integrated stereo camera, which enables see through vision. Instead of using special head tracking devices, an integrated stereo camera can be used for the determination of head position and o...
Article
Real-time processing plays an important role in the achievement of more natural and physically intuitive ways for user-machine interaction. The main scope of this article is the development of a computer vision stereo capture unit that would fulfill more natural user-machine interaction within contemporary mobile telecommunication solutions. One of...
Article
A mathematical model and hardware implementation of a digital filter for skin features identification was presented. The digital filter used FPSLIC technology that featured a high performance combination of FPGA programmable logic circuits and RISC microcontrollers. A polyhedron with appropriate threshold values, corresponding to skin-colored clust...
Article
Certain conclusions and facts have existed over the last few years which have contributed to widespread negative attitudes about 2.5 and 3G systems. Technical lapses, bad performance, nonrealistic costs, and unfulfilled expectations are some of the most pertinent motives cited by experts for a lack of interest among enterprise users and customers....
Article
A lot of external natural language resources are used in spoken dialogue systems. These resources present considerable problems because of the needed space and slow lookup-time. It is, therefore, very important that the presentation of external language resources is time and space efficient. It is also very important that new language resources are...
Article
This article treats the design and programming of a PCI expansion card, build around the Texas Instruments TMS320C31 floating point DSP. We encountered the need for a development system, which could be used for development of advanced applications in signal processing. The existing development kits usually use serial or parallel interface to the ho...
Conference Paper
The personal navigator presents a multimodal communication device. To its user it enables visual, tactile and voice communication. Visual and tactile communication between the user and the navigator runs over a graphical LCD display with touch-panel, which in that way serves as an input and output device. Through GSM data communication the personal...
Conference Paper
Programmable logic offers an alternative solution for the computationally-intensive functions found in digital signal processing (DSP). Programmable logic can provide increased DSP system performance at reduced system cost. Programmable logic combines the flexibility of a general purpose DSP plus the speed, density, and low cost of an ASIC implemen...
Article
This article is about development of mathematical model and hardware implementation of the digital filter for skin features identification. With increasing popularity of digital video the computer vision is becoming one of the common media in mainstream electronics. One of the general tasks that are required by consumer computer vision systems is i...
Article
Full-text available
Certain conclusions and facts have existed over the last few years which have contributed to widespread negative attitudes about 2.5 and 3G systems. Technical lapses, bad performance, nonrealistic costs, and unfulfilled expectations are some of the most pertinent motives cited by experts for a lack of interest among enterprise users and customers....

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