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Sirmacek, B. (author), Lindenbergh, R.C. (author), Wang, J. (author)3D urban models are valuable for urban map generation, environment monitoring, safety planning and educational purposes. For 3D measurement of urban structures, generally airborne laser scanning sensors or multi-view satellite images are used as a data source. However, close-range sensors (such as terrestrial laser scanners) and low cost cameras...journal article 2016
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Yoo, H.W. (author), van Royen, M.E. (author), van Cappellen, WA (author), Houtsmuller, AB (author), Verhaegen, M.H.G. (author), Schitter, G (author)The pinhole plays an important role in confocal laser scanning microscopy (CLSM) for adaptive optics (AO) as well as in imaging, where the size of the pinhole denotes a trade-off between out-of-focus rejection and wavefront distortion. This contribution proposes an AO system for a commercial CLSM with an adjustable square pinhole to cope with...conference paper 2016
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Rutzinger, Martin (author), Hoefle, Bernhard (author), Lindenbergh, R.C. (author), Oude Elberink, Sander (author), Pirotti, Francesco (author), Sailer, Rudolf (author), Scaioni, Marco (author), Stoetter, J. (author), Wujanz, Daniel (author)Early career researchers such as PhD students are a main driving force of scientific research and are for a large part responsible for research innovation. They work on specialized topics within focused research groups that have a limited number of members, but might also have limited capacity in terms of lab equipment. This poses a serious...journal article 2016
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Wang, J. (author), Lindenbergh, R.C. (author), Shen, Y. (author), Menenti, M. (author)Laser scanning samples the surface geometry of objects efficiently and records versatile information as point clouds. However, often more scans are required to fully cover a scene. Therefore, a registration step is required that transforms the different scans into a common coordinate system. The registration of point clouds is usually conducted...journal article 2016
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Sirmacek, B. (author), Lindenbergh, R.C. (author)Recent technological developments help us to acquire high quality 3D measurements of our urban environment. However, these measurements, which come as point clouds or Digital Surface Models (DSM), do not directly give 3D geometrical models of buildings. In addition to that, they are not suitable for fast 3D rendering. Therefore, detection and 3D...journal article 2015
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Lichtenauer, J.F. (author), Sirmacek, B. (author)We introduce a method to texture 3D urban models with photographs that even works for Google Streetview images and can be done with currently available free software. This allows realistic texturing, even when it is not possible or cost-effective to (re)visit a scanned site to take textured scans or photographs. Mapping a photograph onto a 3D...conference paper 2015
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Sirmacek, B. (author), Lindenbergh, R.C. (author)Development of laser scanning technologies has promoted tree monitoring studies to a new level, as the laser scanning point clouds enable accurate 3D measurements in a fast and environmental friendly manner. In this paper, we introduce a probability matrix computation based algorithm for automatically classifying laser scanning point clouds into...conference paper 2015
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Wang, J. (author), Lindenbergh, R.C. (author), Menenti, M. (author)Laser scanning has become a well established surveying solution for obtaining 3D geo-spatial information on objects and environment. Nowadays scanners acquire up to millions of points per second which makes point cloud huge. Laser scanning is widely applied from airborne, carborne and stable platforms, resulting in point clouds obtained at...conference paper 2015
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Roebroeks, J. (author)Merging interior and exterior laser scanning point clouds of the historical windmill, completing the missing parts from airborne laser scanning data and trying different mesh generation methods for full 3D windmill model generation in order to be able to perform virtual visits in the future.bachelor thesis 2015
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Yoo, H.W. (author)Confocal laser scanning microscopy (CLSM) is considered as one of the major advancements in microscopy in the last century and is widely accepted as a 3D fluorescence imaging tool for biological studies. For the emerging biological questions CLSM requires fast imaging to detect rapid biological processes and aberration-corrected imaging to...doctoral thesis 2015
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Pietrzyk, P.J. (author)Remote sensing of forests with airborne laser scanning has been used increasingly in the last decades. Due to its capability to provide very detailed three-dimensional information on the structure of forests and individual trees it is very suitable to detect changes in forests. However, current change detection methods in this field often cannot...master thesis 2015
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Stanic, N. (author), Langeveld, J.G. (author), Clemens, F.H.L.R. (author)There is still a long way to go in understanding the behaviour of solids in sewers due to the difficulties in obtaining sufficient monitoring data to be able to understand the dominant processes. Laser profilers have shown to be capable of measuring the pipe interior, with a high accuracy, which is sufficient to be able to detect and quantify...conference paper 2014
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Visser, A.H. (author)Several programs have been written to process laser scan data from two shoals in the Netherlands. The first makes a grid of heights, the second calculates deformations and makes plots. The third utilises a variogram to obtain information about the amplitude, direction and wavelength of tidal ripples, which are processed and plotted by a fourth...bachelor thesis 2014
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Wang, J. (author), González-Jorge, Higinio (author), Lindenbergh, R.C. (author), Arias-Sánchez, Pedro (author), Menenti, M. (author)Mountain roads are the lifelines of remote areas but are often situated in complicated settings and prone to landslides, rock fall, avalanches and damages due to surface water runoff. The impact and likelihood of these types of hazards can be partly assessed by a detailed geometric analysis of the road environment. Field measurements in...journal article 2014
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Pietrzyk, Peter (author), Lindenbergh, R.C. (author)Identification of harvested and fallen trees is a prerequisite for the detection and measurement of changes in forests. This paper presents a three step approach to monitor harvested and fallen trees based on direct comparison of repeated high density airborne LIDAR data. In a first step differences between data sets are obtained from a point...journal article 2014
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Sirmacek, B. (author), Lindenbergh, R.C. (author)Low-cost sensor generated 3D models can be useful for quick 3D urban model updating, yet the quality of the models is questionable. In this article, we evaluate the reliability of an automatic point cloud generation method using multi-view iPhone images or an iPhone video file as an input. We register such automatically generated point cloud...journal article 2014
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Lindenbergh, R.C. (author)Change detection is an important application of laser scanning data. It is also a challenging application as errors that are inevitably present when determining the geometric state of a scene of interest in a certain epoch will somehow add up when comparing the geometric state between epochs. As a consequence it is often difficult to distinguish...conference paper 2013
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Sirmacek, B. (author), Lindenbergh, R.C. (author), Menenti, M. (author)Fusion of 3D airborne laser (LIDAR) data and terrestrial optical imagery can be applied in 3D urban modeling and model up-dating. The most challenging aspect of the fusion procedure is registering the terrestrial optical images on the LIDAR point clouds. In this article, we propose an approach for registering these two different data from...conference paper 2013
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Vanhaekendover, H. (author)For the construction of breakwaters large amounts of armourstone which are produced in dedicated quarries are needed. The better the in-situ block size distribution (IBSD) of these quarries can be determined, the more accurately the quarry production can be predicted. Currently, the IBSD prediction is based on manually acquired scanline data....master thesis 2013
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Mateus, L. (author), Ferreira, V. (author)In this paper we describe an experience undertaken in the Faculty of Architecture of Technical University of Lisbon, concerning the introduction of a 3D Digitization course in the frame of the PhD doctorate program in Architecture and in the frame of the Masters programs in Architecture, Urbanism and Design.We start by describing the...conference paper 2013