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Application of laser scanning for rock mass characterization and discrete fracture network generation in an underground limestone mine Open
Terrestrial laser scanning (TLS) is a useful technology for rock mass characterization. A laser scanner produces a massive point cloud of a scanned area, such as an exposed rock surface in an underground tunnel, with millimeter precision. …
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How do we see fractures? Quantifying subjective bias in fracture data collection Open
The characterisation of natural fracture networks using outcrop analogues is important in understanding subsurface fluid flow and rock mass characteristics in fractured lithologies. It is well known from decision sciences that subjective b…
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Sparsity Analysis of a Sonomyographic Muscle–Computer Interface Open
The selection of a small subset of transducer elements can enable the reduction of computation, and simplification of the instrumentation and power consumption of wearable sonomyographic MCIs, particularly for rehabilitation and gesture re…
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Correction of scan line shift artifacts in scanning electron microscopy: An extended digital image correlation framework Open
High resolution scanning electron microscopy (HR-SEM) is nowadays very popular for different applications in different fields. However, SEM images may exhibit a considerable amount of imaging artifacts, which induce significant errors if t…
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Filling gaps in Landsat ETM+ SLC-off images with Sentinel-2 MSI images Open
On May 31, 2003, the scan-line corrector (SLC) of Landsat 7 ETM+ failed permanently. The resulting ETM+ SLC-off images contain 22% un-scanned gap pixels, thus, severely limiting their utility. In this paper, we propose a new scheme to fill…
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Multi-anchor spatial phase unwrapping for fringe projection profilometry Open
Phase unwrapping is a necessary step in fringe-projection profilometry that produces accurate depth maps. However, the original wrapped phase is often corrupted by errors, and thus conventional spatial unwrapping suffers from error propaga…
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A New Approach to Line Simplification Based on Image Processing: A Case Study of Water Area Boundaries Open
Line simplification is an important component of map generalization. In recent years, algorithms for line simplification have been widely researched, and most of them are based on vector data. However, with the increasing development of co…
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Flexible calibration method for line-scan cameras using a stereo target with hollow stripes Open
With the advantages of ultrahigh resolution and acquisition rate, stereo line-scan sensors are gradually being developed for three-dimensional (3D) measurements. Calibration is crucial for line-scan cameras. However, viewing targets of lin…
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Pre-classification of points and segmentation of urban objects by scan line analysis of airborne LIDAR data Open
Currently available laser scanners are capable of performing hundreds of thousands of range measurements per second at a range resolution of a few centimeters. Despite that increasing performance, up to now airborne LiDAR mapping has estab…
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Space Subdivision in Indoor Mobile Laser Scanning Point Clouds Based on Scanline Analysis Open
Indoor space subdivision is an important aspect of scene analysis that provides essential information for many applications, such as indoor navigation and evacuation route planning. Until now, most proposed scene understanding algorithms h…
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Automatic Road Marking Extraction and Vectorization from Vehicle-Borne Laser Scanning Data Open
Automatic driving technology is becoming one of the main areas of development for future intelligent transportation systems. The high-precision map, which is an important supplement of the on-board sensors during shielding or limited obser…
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Spectral Temporal Information for Missing Data Reconstruction (STIMDR) of Landsat Reflectance Time Series Open
The number of Landsat time-series applications has grown substantially because of its approximately 50-year history and relatively high spatial resolution for observing long term changes in the Earth’s surface. However, missing observation…
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How do we see fractures? Quantifying subjective bias in fracture data collection Open
The characterisation of natural fracture networks using outcrop analogues is important in understanding sub-surface fluid flow and rock mass characteristics in fractured lithologies. It is well known from decision-sciences that subjective …
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ASSESSMENT OF THE GEOMETRIC QUALITY OF SENTINEL-2 DATA Open
High resolution (10 m and 20 m) optical imagery satellite Sentinel-2 brings a new perspective to Earth observation. Its frequent revisit time enables monitoring the Earth surface with high reliability. Since Sentinel-2 data is provided fre…
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SCAN PLANNING AND ROUTE OPTIMIZATION FOR CONTROL OF EXECUTION OF AS-DESIGNED BIM Open
Scan-to-BIM systems have been recently proposed for the dimensional and quality assessment of as-built construction components with planned works. The procedure is generally based on the geometric alignment and comparison of as-built laser…
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Scan Line Intensity-Elevation Ratio (SLIER): An Airborne LiDAR Ratio Index for Automatic Water Surface Mapping Open
Owing to the characteristics of how a laser interacts with the water surface and water column, the measured Light Detection and Ranging (LiDAR) intensity values are different with respect to the laser wavelength, the scanning geometry and …
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Power Line Extraction and Reconstruction Methods from Laser Scanning Data: A Literature Review Open
Electricity has become an indispensable source of energy, and power lines play a crucial role in the functioning of modern societies. It is essential to inspect power lines promptly and precisely in order to ensure the safe and secure deli…
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CW coherent detection lidar for micro-Doppler sensing and raster-scan imaging of drones Open
We demonstrate a continuous-wave (CW) coherent detection lidar (CDL) capable of detecting micro-Doppler (propeller) signatures and acquiring raster-scan images of small unmanned aerial systems/vehicles (UAS/UAV). The system uses a narrow-l…
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Incremental and Enhanced Scanline-Based Segmentation Method for Surface Reconstruction of Sparse LiDAR Data Open
The segmentation of point clouds is an important aspect of automated processing tasks such as semantic extraction. However, the sparsity and non-uniformity of the point clouds gathered by the popular 3D mobile LiDAR devices pose many chall…
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Optimizing the Ultrasound Tongue Image Representation for Residual Network-Based Articulatory-to-Acoustic Mapping Open
Within speech processing, articulatory-to-acoustic mapping (AAM) methods can apply ultrasound tongue imaging (UTI) as an input. (Micro)convex transducers are mostly used, which provide a wedge-shape visual image. However, this process is o…
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ASSESSMENT OF THE GEOMETRIC QUALITY OF SENTINEL-2 DATA Open
High resolution (10 m and 20 m) optical imagery satellite Sentinel-2 brings a new perspective to Earth observation. Its frequent revisit time enables monitoring the Earth surface with high reliability. Since Sentinel-2 data is provided fre…
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Fast Ground Filtering of Airborne LiDAR Data Based on Iterative Scan-Line Spline Interpolation Open
Over the last two decades, a wide range of applications have been developed from Light Detection and Ranging (LiDAR) point clouds. Most LiDAR-derived products require the distinction between ground and non-ground points. Because of this, g…
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Towards an Optimization of Sample Plot Size and Scanner Position Layout for Terrestrial Laser Scanning in Multi-Scan Mode Open
A novel approach is presented to model the tree detection probability of terrestrial laser scanning (TLS) in forest inventory applications using a multi-scan mode. The traditional distance sampling framework is further extended to account …
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Scan Line Void Filling of Airborne LiDAR Point Clouds for Hydroflattening DEM Open
Generation of LiDAR-derived digital elevation model (DEM), particularly for hydrologic and shore environments, poses a continuous challenge. The presence of laser dropouts found on the water bodies causes data voids/holes in the airborne L…
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Scanner‐Based Direct Laser Interference Patterning on Stainless Steel Open
Direct laser interference patterning (DLIP) so far has been used almost exclusively in combination with mechanical translation stages reaching impressive throughputs for very specific configurations. As an alternative, DLIP modules can be …
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Square Layout Four-Point Method for Two-Dimensional Profile Measurement and Self-Calibration Method of Zero-Adjustment Error Open
An on-machine measurement method, called the square-layout four-point (SLFP) method with angle compensation, for evaluating two-dimensional (2-D) profiles of flat machined surfaces is proposed. In this method, four displacement sensors are…
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Low Power Compact 3D-Constructed AlScN Piezoelectric MEMS Mirrors for Various Scanning Strategies Open
In this paper, the newly developed 3D-constructed AlScN piezoelectric MEMS mirror is presented. This paper describes the structure and driving mechanism of the proposed mirror device, covering its driving characteristics in both quasi-stat…
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In-motion continuous point cloud measurement based on bundle adjustment fused with motion information of triple line-scan images Open
The point cloud continuous measurements in some in-motion circumstances, such as quality inspection of products on assembly lines or rail traffic, have been requiring higher measurement speed, accuracy, and point cloud density. With the ad…
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Identification tibia and fibula bone fracture location using scanline algorithm Open
Fracture is a condition that there is a damage in the continuity of the bone, usually caused by stress, trauma or weak bones. The tibia and fibula are two separated-long bones in the lower leg, closely linked at the knee and ankle. Tibia/f…
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Lane Detection Algorithm Based on Road Structure and Extended Kalman Filter Open
Lane detection still demonstrates low accuracy and missing robustness when recorded markings are interrupted by strong light or shadows or missing marking. This article proposes a new algorithm using a model of road structure and an extend…