Arpad Barsi

Arpad Barsi
Budapest University of Technology and Economics · Department of Photogrammetry and Geoinformatics

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108
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Publications

Publications (108)
Article
Autonomous and highly automated driving has become one of the key research topics – even in mapping sciences. Today, it has been clearly proven that the desired autonomy can be reached solely by progressive development, where maps and requirements against environmental models shall be modified. The research of the past decades resulted in the speci...
Article
Autonomous and highly automated transportation is very attractive not only for the automotive but also for the mapping industry. In order to exploit the technology, the latest survey solutions are needed, but beyond that, a clear description of the content is a must. Three standards have been selected: (1) used for a long time in navigation systems...
Article
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A self-driving vehicle is one of the most expected inventions in the near future. These vehicles are enabled by several technological developments, like artificial intelligence, robust control, vehicular sensors, and high-speed communication. But beyond all these elements, the essential component is the knowledge about reality. Our profession has a...
Article
The development of automotive technologies requires quite a significant amount of time and money. To accelerate this procedure, the technology of now is strongly based on computer simulations, where the whole vehicle or its parts can be analyzed in a virtual environment. The behavior of cars, especially equipped with new sensors or assistants, requ...
Article
The vehicles of the conditional, high, and full automation levels have a common unique sensor, the map. The term map has undergone a significant change because the spatial resolution has been increased considerably, the road infrastructure and its neighborhood are represented with higher accuracy in 3D. The development of these vehicles requires en...
Conference Paper
The development of the autonomous vehicles has been accelerated in the last years. The fully automated control of these vehicles requires a robust and reliable localization technique. Unfortunately, the GNSS methodology isn’t universally available, it has strong limitation and accuracy failures in tunnels or urban canyons. The alternative localizat...
Conference Paper
The application of spatial environmental models is getting higher impact in several disciplines, even by self-driving vehicles. The different city models created from diverse data sources by various data capturing techniques help the localization and orientation of these automated vehicles. The highest quality city models can be obtained by mobile...
Article
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The development of autonomous vehicles nowadays is attractive, but a resource-intensive procedure. It requires huge time and money efforts. The different carmakers have therefore common struggles of involving cheaper, faster and accurate computer-based tools, among them the simulators. Automotive simulations expect reality information, where the re...
Article
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Background To examine the rural–urban differences in the prevalence of diabetes mellitus (DM) and diabetic retinopathy (DR) in the population aged 50 years and older in Hungary. Methods 105 clusters of 35 people aged 50 years or older were randomly selected. Standardized rapid assessment of avoidable blindness (RAAB) with the diabetic retinopathy...
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The importance of data quality assessment has significantly increased with the boom of information technology and the growing demand for remote sensing (RS) data. The Remote Sensing Data Quality Working Group of the International Society for Photogrammetry and Remote Sensing aimed to conduct an investigation on the principles of data quality. Liter...
Chapter
Climate protection is worldwide meant as an action plan containing efforts to stop or limit the climate change of the Earth. This action plan is therefore sensitive for the climatic features, like temperature, concentration of the gases, vapor or dust in the Earth atmosphere. The climate change mitigation is only then successful, if the actors (age...
Article
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Our rapidly changing world requires new sources of image based information. The quickly changing urban areas, the maintenance and management of smart cities cannot only rely on traditional techniques based on remotely sensed data, but also new and progressive techniques must be involved. Among these technologies the volunteer based solutions are ge...
Article
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Purpose To describe and correlate the degree of anterior segment inflammation with central retinal and choroidal thickness throughout the treatment period (in the course of follow-up) in the eyes affected with acute anterior uveitis in the patients with seronegative spondyloarthropathy (subgroup: ankylosing spondylitis). Methods Thirty eyes of 30...
Article
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Driving a road vehicle is a very complex task in terms of controlling it, substituting a human driver with a computer is a real challenge also from the technical side. An important step in vehicle controlling is when the vehicle plans its own trajectory. The input of the trajectory planning are the purpose of the passengers and the environment of t...
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The terrestrial and mobile laser scanning has become nowadays a mature technology applied in several technical and non-technical applications. The transportation infrastructure can be surveyed by these technologies in an excellent way, then 3D maps, fly-through videos and road furniture inventories can be derived among many other applications. The...
Chapter
The OpenCRG road surface model as part of an open available data format is originally designed for simulation purposes, where the micro level information about the road surface is stored in this format. The paper introduces the whole open data format family (OpenDRIVE, OpenCRG and OpenSCENARIO) and then demonstrates that an efficient road surveying...
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The availability and accessibility of remote sensing (RS) data, cloud processing platforms and provided information products and services has increased the size and diversity of the RS user community. This development also generates a need for validation approaches to assess data quality. Validation approaches employ quality criteria in their asses...
Article
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The technological developments in remote sensing (RS) during the past decade has contributed to a significant increase in the size of data user community. For this reason data quality issues in remote sensing face a significant increase in importance, particularly in the era of Big Earth data. Dozens of available sensors, hundreds of sophisticated...
Article
Full-text available
Steep, hardly accessible cliffs of rhyolite tuff in NE Hungary are prone to rockfalls, endangering visitors of a castle. Remote sensing techniques were employed to obtain data on terrain morphology and to provide slope geometry for assessing the stability of these rock walls. A RPAS (Remotely Piloted Aircraft System) was used to collect images whic...
Conference Paper
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Congestion related traffic flow management requires the thorough analysis of dynamics of queues to develop effective control strategies. Traffic operation of signalized intersections is often hindered by congestions. Queues cause an additional delay decreasing the capacity of the intersection, because in dissipating queues the headways are longer t...
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Capturing the fine details on the surface of small objects is a real challenge to many conventional surveying methods. Our paper discusses the investigation of several data acquisition technologies, such as arm scanner, structured light scanner, terrestrial laser scanner, object line-scanner, DSLR camera, and mobile phone camera. A palm-sized embos...
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Maps are constantly developing, also, the newly defined High Definition (HD) maps increase the map content remarkably. They are based on three-dimensional survey, like laser scanning, and then stored in a fully new structured way to be able to support modern-day vehicles. Beyond the traditional lane based map content, they contain information about...
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The issue of data quality (DQ) is of growing importance in Remote Sensing (RS), due to the widespread use of digital services (incl. apps) that exploit remote sensing data. In this position paper a body of experts from the ISPRS Intercommission working group III/IVb “DQ” identifies, categorises and reasons about issues that are considered as crucia...
Article
Due to the increased traffic, improving road safety is one of the major issues in the transportation policies of most countries. Our primary goal is to locate possible spots where vehicle travel against the traffic direction is possible. Vehicle driving on the wrong side of the road also known as ghost driver. This paper presents a technique in jun...
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Point cloud based modeling has become widely used in recent years in the engineering practice. This paper presents several point clouds produced by different software packages using pixel based multi view spatial reconstruction. The purpose of the investigation is to give statistical quality measures beyond the apparent differences between the poin...
Article
Nowadays application of fibre reinforced concretes (FRC) becomes more and more widespread, due to the favourable experiences with their behaviour. As a consequence, an increasing number of studies are published on different aspects of FRC. Several scientific papers indicate the importance of homogeneous distribution of fibres. Our study includes an...
Conference Paper
Full-text available
High Definition (HD) maps are newly defined maps with remarkably extended content. These maps are based on 3-dimensional surveys of the environment and are stored in a structured way to fully support today's vehicles. The basic map content focuses not only on the lanes, but also on the road neighborhood. The primary information is therefore the con...
Article
Fire can cause damage in structures. The level of damage depends on several factors, such as maximal temperature, duration of fire, constituents of the concrete and so on. It is necessary to design fire-resistant buildings and deal with possible reconstruction after fire. For the reconstruction, it is important to determine the level of damage and...
Article
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Due to the increased demands of traffic safety applicationsmany parameters of the traffic flow have to be measured bydifferent kind of techniques. The sensors of vehicle sensing anddetection are to be inexpensive, currently available and easy todeploy. Therefore, the state-of-the-art safety applications areusually based on mature technologies, such...
Article
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The paper focuses on the 3D data acquisition technologiesthat support capturing the geometry of medieval architecturalfragmented stones. High-resolution models of such fragmentsenable the analysis of profile shapes as well as the markinglines and curves left by the instruments of stonemasons, andtherefore, indirectly, identifying connections betwee...
Article
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Low strength rhyolite tuff forms steep cliffs in NE Hungary. A multi-dimensional approach including field analysis and laboratory tests was conducted to understand the mechanical properties of the tuff and to measure discontinuity surfaces. With the help of RPAS (Remotely Piloted Aircraft System) and TLS (Terrestrial Laser Scanning), a digital terr...
Article
Autonomous vehicles are considered as the next major milestone in the history of transportation. Current vehicles are widely equipped with satellite-based positioning units and further sensors: cameras, laser scanner, and radar-based sensors. These new technologies are capable of not only detecting other vehicles, pedestrians or road obstacles, but...
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3D printing, as a rapid prototyping method is become more common nowadays world widely, including medicine too. The purpose of this article is to reveal the potential of using 3D printing in medicine, especially with a specific example of making a human thorax model from the very beginning of imaging diagnose to the physical model. There will be sh...
Conference Paper
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The photogrammetric object reconstruction seems to find its modern Holy Grail in the pixel-based technology. The great offer of sophisticated software packages prove that the formerly developed computer vision and photogrammetric functions can efficiently be combined to support an accurate object reconstruction. In the paper the general theory and...
Conference Paper
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Steep, and hardly accessible jointed rhyolite tuff cliff faces surround a Castle in NE-Hungary, at village of Sirok. The assessment of cliff stability required the recording of cliff geometry. Traditional surveying was not possible therefore cliff faces were 3D modelled by GNSS supported terrestrial laser scanner and UAV. The onsite engineering geo...
Article
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Computer tomography (CT) is an excellent technique for obtaining accurate 3D information about the human body. It allows to visualize the organs, bones and blood vessels, furthermore it enables to diagnose anomalies and diseases. Its spatial reconstruction capability supports other interesting applications, such as inspecting different, even valuab...
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Full-text available
Web-based photo albums that support organizing and viewing the users’ images are widely used. These services provide a convenient solution for storing, editing and sharing images. In many cases, the users attach geotags to the images in order to enable using them e.g. in location based applications on social networks. Our paper discusses a procedu...
Article
Full-text available
Computer tomography (CT) is an excellent technique for obtaining accurate 3D information about the human body. It allows to visualize the organs, bones and blood vessels, furthermore it enables to diagnose anomalies and diseases. Its spatial reconstruction capability supports other interesting applications, such as inspecting different, even valuab...
Article
Full-text available
Web-based photo albums that support organizing and viewing the users’ images are widely used. These services provide a convenient solution for storing, editing and sharing images. In many cases, the users attach geotags to the images in order to enable using them e.g. in location based applications on social networks. Our paper discusses a proced...
Article
Pedestrian flow is much less regulated and controlled compared to vehicle traffic. Estimating flow parameters would support many safety, security or commercial applications. Current paper discusses a method that enables acquiring information on pedestrian movements without disturbing and changing their motion. Profile laser scanner and depth camera...
Article
Full-text available
Pedestrian flow is much less regulated and controlled compared to vehicle traffic. Estimating flow parameters would support many safety, security or commercial applications. Current paper discusses a method that enables acquiring information on pedestrian movements without disturbing and changing their motion. Profile laser scanner and depth camera...
Conference Paper
Full-text available
Siroki várhegyet alkotó riolittufa állékonysági vizsgálatát mutatja be a cikk, kiemelve a térinformatika és a mérnökgeológia együttes alkalmazását. A sziklalejtő felmérésére az erősen tagolt domborzat miatt és a nehéz megközelíthetőség miatt GNSS támogatású földi lézerszkennelés és drónos légifényképezést alkalmaztunk. Az így kapott térinformatikai...
Article
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Durability and functionality of hot mix asphalts (HMA) depend on air voids and their characteristics. The air void content of asphalt core samples could be determined by direct and indirect methods. The direct methods are destructive since they determine the air void content by decomposing the mix into its individual components. They are usually ac...
Article
Purpose: To evaluate the differences in the biometric parameters of the anterior segment in Fuchs' uveitis syndrome (FUS). Methods: 30 eyes of 15 consecutive patients with unilateral FUS were examined. Anterior segment parameters were measured by rotating Scheimpflug imaging camera. Central endothelial cell count was measured by noncontact specu...
Article
Full-text available
Felszínborítottság vizsgálatokat már eredményesen végeznek multispektrális képek alapján, sőt az ezekhez szükséges magassági információk egyes esetekben LiDAR állományokból származnak [15]. Célunk, hogy a felszínborítottságot csupán LiDAR adatok alapján vizsgáljuk városi területen, mind diszkrét visszaverődések esetén, mind teljes hullámalakok felh...
Article
Full-text available
Purpose: To investigate the characteristics of ocular surface sensations and corneal sensitivity during the interblink interval before and after tear supplementation in dry eye patients. Methods: Twenty subjects (41.88±14.37 years) with dry eye symptoms were included in the dry eye group. Fourteen subjects (39.13±11.27 years) without any clinica...
Article
Computed tomography (CT) is a promising technique that is suitable to analyze core samples of already built structures or test the quality of geomaterials before use. The CT creates an image series of the examined object's cross sections using an X-ray; hence, materials of different density could be separated on the slices. To analyze the images, c...
Chapter
This paper presents an automatic processing of high amount images of X-ray synchrotron tomographic microscopy. The developed method enables the analysis of vascular and even of microvascular network of different organs. In this study a cylindrical shaped, NiDAB labelled brain sample of a diameter of half a millimeter was imaged and analyzed with an...
Article
Purpose: To evaluate the correlation between anterior chamber inflammation and the central foveal thickness of the retina in a homogenous uveitic group (seronegative spondyloarthropathy (subgroup: ankylosing spondylitis)) of patients with the first acute anterior unilateral uveitic attack. Methods: Central foveal thickness (FT) and perifoveal re...
Conference Paper
Full-text available
The penetration of GSM capable devices is very high, especially in Europe. To exploit the potential of turning these mobile devices into dynamic data acquisition nodes that provides valuable data for Intelligent Transportation Systems (ITS), position information is needed. The paper describes the basic operation principles of the GSM system and pro...
Article
Full-text available
The radon transformation is a proven image analysis technique in medical image processing, although there are some applications with satellite images. Among these applications maybe the most interesting one is based on the feature that this mathematical transformation is capable of detecting roads and road junctions. This option makes the transform...
Article
Full-text available
In the urban object detection challenge organized by the ISPRS WG III/4 high geometric and radiometric resolution aerial images about Vaihingen/Stuttgart, Germany are distributed. The acquired data set contains optical false color, near infrared images and airborne laserscanning data. The presented research focused exclusively on the optical image,...
Article
Full-text available
The penetration of GSM capable devices is very high, especially in Europe. To exploit the potential of turning these mobile devices into dynamic data acquisition nodes that provides valuable data for Intelligent Transportation Systems (ITS), position information is needed. The paper describes the basic operation principles of the GSM system and pro...
Article
Full-text available
The paper presents a road junction operator, which was developed for medium resolution black-and-white orthoimages. The operator uses a feed-forward neural network applied for a running window to decide whether it contains a 3-or 4-arm road junction or not. The training set was created by a data analysis based feature selection. The best features t...
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Three dimensional terrestrial laser scanning has already proved its potential in several application fields, such as topography, archaeology, mining and cultural heritage protection. Beside these areas a new demand emerged: accurate point cloud acquisition and post-processed results in engineering survey. This technology could broaden the field of...
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Terrestrial laser scanning broadens its application areas in civil engineering, and claims even more attention in engineering survey. The paper shows the results of a laboratory test of a laser scanner. The laboratory test involved complex 3D accuracy analysis, reflectivity investigation of different colors and materials used at construction sites...
Article
In many laser scanning projects the measurement circumstances, accuracy issues are not discussed in detail. The Department of Photogrammetry and Geoinformatics has carried out a comprehensive laboratory investigation in order to specify the measurement parameters of a Riegl LMS Z420i terrestrial laser scanner. The investigation includes accuracy as...
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Full-text available
The state-of-the-art geodetic and remote sensing techniques can prove their potential through particular engineering applications. Besides the traditional surveying terrestrial laserscanning broadens its application. field in. civil engineering projects. The Department of Photogrammetry and Geoinformatics has long experience in the measurement meth...
Article
In the paper the theoretical background of the active contours is presented, followed by easy practical examples demonstrating their possible use in photogrammetry and remote sensing image analysis. A further case study shows the change detection of geometric data stored in GIS databases.