Automated rock fragmentation measurement with close range digital photogrammetry

2012 ◽  
pp. 13-21 ◽  
Author(s):  
M Noy
Keyword(s):  
Rock Fragmentation ◽  
Digital Photogrammetry ◽  
Close Range

FEM modeling of structures based on close range digital photogrammetry

2009 ◽  
Vol 18 (5) ◽  
pp. 559-569 ◽  
Author(s):  
Julia Armesto ◽  
Izabela Lubowiecka ◽  
Celestino Ordóñez ◽  
Fernando I. Rial
Keyword(s):  
Digital Photogrammetry ◽  
Fem Modeling ◽  
Close Range

The Application of Close-Range Digital Photogrammetry Based on the Neural Network in Crack-Monitoring

2011 ◽  
Vol 90-93 ◽  
pp. 2875-2880
Author(s):  
Ming Ming Li ◽  
Jian Gong Chen ◽  
Yong Xing Zhang
Keyword(s):  
Neural Network ◽  
New Technology ◽  
Lens Distortion ◽  
Two Dimensional ◽  
Digital Photogrammetry ◽  
The Neural Network ◽  
Crack Monitoring ◽  
Close Range ◽  
Grid Points ◽  
Linear Neural Network

Based on the two-dimensional Direct Linear Transformation (DLT) principle of close-range digital photogrammetry and mathematical principle of the linear neuron, the equivalent relationship between linear neural network and the two-dimensional DLT of close-range digital photogrammetry is discussed. A neural network with 2 linear neurons, 6 input parameters and 2 output parameters is established to simulate the two-dimensional DLT. The network can be trained using a set of grid points in the control coordinate system with known world coordinates and pixel coordinates. The weights and biases of trained network contain camera interior and exterior parameters. A new digital photographic technique is put forward combined camera self-calibration based on neural network with non-linear pixel coordinates correction of lens distortion. The indoor survey test indicates that measurement is more accuracy. Meanwhile, the new technology is successfully used in crack monitor of a bridge pier.

scholarly journals Applicability Assessments of Close-Range Photogrammetry for Slope Face 3D Modelling

2020 ◽  
Vol 8 (3) ◽  
pp. 143-150
Author(s):  
Haqul Baramsyah ◽  
Less Rich
Keyword(s):  
Laser Scanning ◽  
3D Model ◽  
Laser Scanner ◽  
Cost Effective ◽  
3D Models ◽  
Digital Photogrammetry ◽  
Aerial Photogrammetry ◽  
3D Data ◽  
Image Capturing ◽  
Close Range

The digital single lens reflex (DSLR) cameras have been widely accepted to use in slope face photogrammetry rather than the expensive metric camera used for aerial photogrammetry. 3D models generated from digital photogrammetry can approach those generated from terrestrial laser scanning in term of scale and level of detail. It is cost effective and has equipment portability. This paper presents and discusses the applicability of close-range digital photogrammetry to produce 3D models of rock slope faces. Five experiments of image capturing method were conducted to capture the photographs as the input data for processing. As a consideration, the appropriate baseline lengths to capture the slope face to get better result are around 1/6 to 1/8 of target distance.  A fine quality of 3D model from data processing is obtained using strip method and convergent method with 80% overlapping in each photograph. A random camera positions with different distances from the slope face can also generate a good 3D model, however the entire target should be captured in each photograph. The accuracy of the models is generated by comparing the 3D models produced from photogrammetry with the 3D data obtained from laser scanner. The accuracy of 3D models is quite satisfactory with the mean error range from 0.008 to 0.018 m.

scholarly journals 3D modelling of industrial piping systems using digital photogrammetry and laser scanning

2021 ◽  
Author(s):  
Jingook Hong
Keyword(s):  
Laser Scanning ◽  
Point Clouds ◽  
3D Modelling ◽  
Piping System ◽  
Digital Cameras ◽  
Digital Photogrammetry ◽  
Setup Accuracy ◽  
Surface Materials ◽  
Piping Systems ◽  
Close Range

Industrial metrology is one of the fastest growing areas in advanced technologies, such as electronics and optics, computation speed, and it has been increased in recent years. There are several tools used in industrial metrology, such as total stations, digital photogrammetry, and laser scanning. Close range digital photogrammetry has been implemented for an industrial piping system in terms of installation, inspection, and replacement. Laser scanning is also used for industrial measurements to generate 3D coordinates points. In order to develop a 3D modelling strategy, this thesis focuses on the development, selection and design of photogrammetric procedures and project specific targets. This thesis also explores image-acquiring sensors such as digital cameras and laser scanners in terms of their capabilities and advantages. Based on experimental setup accuracy, measurements of piping systems are compared for applications of two different sensors. Effects of different surface materials are examined in laser scanning applications and several different types of materials are used for acquiring point clouds data. Measurement of pipes' diameters and residual analyses are conducted with different surface materials, which are used for industrial pipes. Significant improvement in laser scanning data acquisition is examined in terms of data quality both quantitatively and qualitatively during the residual analyses.

scholarly journals CLOSE RANGE DIGITAL PHOTOGRAMMETRY APPLIED TO TOPOGRAPHY AND LANDSLIDE MEASUREMENTS

2016 ◽  
Vol XLI-B5 ◽  
pp. 875-880 ◽  
Author(s):  
Wen-Cheng Liu ◽  
Wei-Che Huang
Keyword(s):  
Low Cost ◽  
Digital Terrain Model ◽  
Landslide Monitoring ◽  
Digital Photogrammetry ◽  
Terrain Model ◽  
Digital Terrain ◽  
Gps Measurement ◽  
Before And After ◽  
Close Range ◽  
Central Taiwan

Landslide monitoring is a crucial tool for the prevention of hazards. It is often the only solution for the survey and the early-warning of large landslides cannot be stabilized. The objective of present study is to use a low-cost image system to monitor the active landslides. We adopted the direct linear transformation (DLT) method in close range digital photogrammetry to measure terrain of landslide at the Huoyen Shan, Miaoli of central Taiwan and to compare measured results with e-GPS. The results revealed that the relative error in surface area was approximately 1.7% as comparing the photogrammetry with DLT method and e-GPS measurement. It showed that the close range digital photogrammetry with DLT method had the availability and capability to measure the landslides. The same methodology was then applied to measure the terrain before landslide and after landslide in the study area. The digital terrain model (DTM) was established and then was used to calculate the volume of the terrain before landslide and after landslide. The volume difference before and after landslides was 994.16 m<sup>3</sup>.

Assessment of Erosion, Deposition and Rill Development On Irregular Soil Surfaces Using Close Range Digital Photogrammetry

2010 ◽  
Vol 25 (131) ◽  
pp. 299-318 ◽  
Author(s):  
Gizaw D. Gessesse ◽  
Helmut Fuchs ◽  
Reinfried Mansberger ◽  
Andreas Klik ◽  
Dirk H. Rieke-Zapp
Keyword(s):  
Digital Photogrammetry ◽  
Close Range
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