scholarly journals Accuracy Assessment of Various Resolutions Digital Cameras For Close Range Photogrammetry Applications

2018 ◽  
Vol 24 (9) ◽  
pp. 78 ◽  
Author(s):  
Jasim Ahmed Ali AL-Baghdadi ◽  
Hassan Ali Alizze ◽  
Kasim Abed AL-Hussein
Keyword(s):  
Indoor Environment ◽  
Accuracy Assessment ◽  
3D Models ◽  
Outdoor Environment ◽  
Digital Cameras ◽  
Object Distance ◽  
Close Range ◽  
Precise Relationship ◽  
Indoor And Outdoor

Due to the great evolution in digital commercial cameras, several studies have addressed the using of such cameras in different civil and close-range applications such as 3D models generation. However, previous studies have not discussed a precise relationship between a camera resolution and the accuracy of the models generated based on images of this camera. Therefore the current study aims to evaluate the accuracy of the derived 3D buildings models captured by different resolution cameras. The digital photogrammetric methods were devoted to derive 3D models using the data of various resolution cameras and analyze their accuracies. This investigation involves selecting three different resolution cameras (low, medium and high) and evaluating their calibration accuracies. Assessing the accuracy of the three selected cameras in capturing indoor and outdoor objects; and analyzing the accuracy and the quality of the produced models. The study revealed that:1) It is recommended to use the photos of a high-resolution camera for producing precise 3D models of objects in the outdoor environment especially when the camera/object distance is more than 40 m because the accuracy of the  produced models can be  precise (RMSE ±10.36mm) with excellent quality; 2) The Low-resolution camera can be utilised to produce adequate 3D models of object in the indoor environment (RMSE ±6.32mm) especially when the camera/object distance is less than 40 m.  

scholarly journals EXPERIMENTS ON CALIBRATING TILT-SHIFT LENSES FOR CLOSE-RANGE PHOTOGRAMMETRY

2016 ◽  
Vol XLI-B5 ◽  
pp. 99-105 ◽  
Author(s):  
E. Nocerino ◽  
F. Menna ◽  
F. Remondino ◽  
J.-A. Beraldin ◽  
L. Cournoyer ◽  
...  
Keyword(s):  
Optical Axis ◽  
National Research Council ◽  
Image Plane ◽  
Limiting Factors ◽  
Depth Of Field ◽  
Small Object ◽  
Digital Cameras ◽  
Close Range Photogrammetry ◽  
Object Distance ◽  
Close Range

One of the strongest limiting factors in close range photogrammetry (CRP) is the depth of field (DOF), especially at very small object distance. When using standard digital cameras and lens, for a specific camera – lens combination, the only way to control the extent of the zone of sharp focus in object space is to reduce the aperture of the lens. However, this strategy is often not sufficient; moreover, in many cases it is not fully advisable. In fact, when the aperture is closed down, images lose sharpness because of diffraction. Furthermore, the exposure time must be lowered (susceptibility to vibrations) and the ISO increased (electronic noise may increase). In order to adapt the shape of the DOF to the subject of interest, the Scheimpflug rule is to be applied, requiring that the optical axis must be no longer perpendicular to the image plane. Nowadays, specific lenses exist that allow inclining the optical axis to modify the DOF: they are called tilt-shift lenses. In this paper, an investigation on the applicability of the classic photogrammetric model (pinhole camera coupled with Brown’s distortion model) to these lenses is presented. Tests were carried out in an environmentally controlled metrology laboratory at the National Research Council (NRC) Canada and the results are hereafter described in detail.

scholarly journals Accuracy assessment of terrestrial laser scanning and digital close range potogrammetry for 3D cultural heritage

2021 ◽  
Author(s):  
Abdullah Taha Ahmed Albourae
Keyword(s):  
Cultural Heritage ◽  
Laser Scanning ◽  
Reference Data ◽  
Accuracy Assessment ◽  
Terrestrial Laser Scanning ◽  
First Case ◽  
Culture Heritage ◽  
Close Range

There are various surveying techniques used in the field of cultural heritage documentation. Close Range Photogrammetry (CRP) and Terrestrial Laser Scanning (TLS) techniques have been widely used in 3D modeling applications. Various research studies integrate these techniques to enhance the quality of the data acquired. The main objective of this research is to assess the accuracy of TLS and CRP. The two methods are applied to two culture heritage case studies, which are located in the historic district in Jeddah, Saudi Arabia. The data obtained from both techniques is compared with data captured using traditional surveying techniques as reference data. The results show that TLS tends to be more accurate than CRP. In the first case study (Bab Makkah), CRP and TLS produced 0.044 m and 0.008 m overall RMS error, respectively; while CRP produced 0.025 m and TLS produced 0.021 m in the second case study (Bab Sharif).

scholarly journals CAMERA CALIBRATION ACCURACY AT DIFFERENT UAV FLYING HEIGHTS

2017 ◽  
Vol XLII-2/W3 ◽  
pp. 595-600 ◽  
Author(s):  
A. R. Yusoff ◽  
M. F. M. Ariff ◽  
K. M. Idris ◽  
Z. Majid ◽  
A. K. Chong
Keyword(s):  
Camera Calibration ◽  
Accuracy Assessment ◽  
Low Cost ◽  
Digital Camera ◽  
Bundle Adjustment ◽  
Digital Cameras ◽  
Mapping Accuracy ◽  
Image Mapping ◽  
Object Distance ◽  
Uav Image

Unmanned Aerial Vehicles (UAVs) can be used to acquire highly accurate data in deformation survey, whereby low-cost digital cameras are commonly used in the UAV mapping. Thus, camera calibration is considered important in obtaining high-accuracy UAV mapping using low-cost digital cameras. The main focus of this study was to calibrate the UAV camera at different camera distances and check the measurement accuracy. The scope of this study included camera calibration in the laboratory and on the field, and the UAV image mapping accuracy assessment used calibration parameters of different camera distances. The camera distances used for the image calibration acquisition and mapping accuracy assessment were 1.5 metres in the laboratory, and 15 and 25 metres on the field using a Sony NEX6 digital camera. A large calibration field and a portable calibration frame were used as the tools for the camera calibration and for checking the accuracy of the measurement at different camera distances. Bundle adjustment concept was applied in Australis software to perform the camera calibration and accuracy assessment. The results showed that the camera distance at 25 metres is the optimum object distance as this is the best accuracy obtained from the laboratory as well as outdoor mapping. In conclusion, the camera calibration at several camera distances should be applied to acquire better accuracy in mapping and the best camera parameter for the UAV image mapping should be selected for highly accurate mapping measurement.

Low-cost Photogrammetry for Culture Heritage

2017 ◽  
Author(s):  
Roman Shults ◽  
Petro Krelshtein ◽  
Iulia Kravchenko ◽  
Olga Rogoza ◽  
Oleksandr Kyselov
Keyword(s):  
High Efficiency ◽  
Low Cost ◽  
3D Models ◽  
Theory And Practice ◽  
Quality Data ◽  
Digital Cameras ◽  
High Quality ◽  
Culture Heritage ◽  
Practical Guidelines ◽  
Close Range

Culture heritage will always remain one of the priorities of any state. Taking a cultural or historical object under protection is impossible without inventory. The best technology, which allows getting high-quality inventory, is close-range photogrammetry. Unfortunately, the full capabilities of this technology is fully owned by professionals only. The situation changed significantly with the advent of mobile devices that are equipped with digital cameras and low-cost software that does not require any special knowledge in the theory and practice of photogrammetry. These developments have been called lowcost photogrammetry technologies. In the present study, we examined the use of smartphones and nano UAV and PhotoScan software for solve the problem fortifications II World War inventory near the city of Kiev. For qualitative data, the calibration of digital cameras in smartphones and ultra-light UAV was performed on calibration bench. One of the features of this project was the integration of the terrestrial photos and photos captured by nano UAVs. As a result of work performed were obtained 3D models of fortifications. Results showed high efficiency of the low-cost photogrammetry technologies. At the end of work some practical guidelines were provided, how to get high-quality data using low-cost photogrammetry technologies.

scholarly journals Using the IBM SPSS SW Tool with Wavelet Transformation for CO2 Prediction within IoT in Smart Home Care

Sensors ◽  
2019 ◽  
Vol 19 (6) ◽  
pp. 1407 ◽  
Author(s):  
Jan Vanus ◽  
Jan Kubicek ◽  
Ojan M. Gorjani ◽  
Jiri Koziorek
Keyword(s):  
Home Care ◽  
Smart Home ◽  
Indoor Environment ◽  
Software Tools ◽  
Intelligent Buildings ◽  
Iot Platforms ◽  
Spss Software ◽  
Technical Functions ◽  
Indoor And Outdoor

Standard solutions for handling a large amount of measured data obtained from intelligent buildings are currently available as software tools in IoT platforms. These solutions optimize the operational and technical functions managing the quality of the indoor environment and factor in the real needs of residents. The paper examines the possibilities of increasing the accuracy of CO2 predictions in Smart Home Care (SHC) using the IBM SPSS software tools in the IoT to determine the occupancy times of a monitored SHC room. The processed data were compared at daily, weekly and monthly intervals for the spring and autumn periods. The Radial Basis Function (RBF) method was applied to predict CO2 levels from the measured indoor and outdoor temperatures and relative humidity. The most accurately predicted results were obtained from data processed at a daily interval. To increase the accuracy of CO2 predictions, a wavelet transform was applied to remove additive noise from the predicted signal. The prediction accuracy achieved in the selected experiments was greater than 95%.

scholarly journals FIRST APPROACH TO UAV-BASED CONTACT INSPECTION: A SMART PAYLOAD FOR NAVIGATION IN THE NEIGHBOURHOOD OF STRUCTURES

2019 ◽  
Vol XLII-2/W13 ◽  
pp. 323-328 ◽  
Author(s):  
L. M. González-de Santos ◽  
J. Martínez-Sánchez ◽  
H. González-Jorge ◽  
A. Novo ◽  
P. Arias
Keyword(s):  
Remote Sensing ◽  
Unmanned Aerial Vehicles ◽  
Calibration Curve ◽  
Horizontal Plane ◽  
Indoor Environment ◽  
Digital Cameras ◽  
Good Position ◽  
Aerial Vehicles ◽  
Close Range ◽  
Inspection Tasks

<p><strong>Abstract.</strong> Many inspection tasks of structures are already carried out by unmanned aerial vehicles (UAV). Most of these inspections consist of using payloads for close range remote sensing purposes (i.e. digital cameras, thermal or LiDAR sensors). In all these inspection tasks the UAV system does not need to be close to the structure and typically the GPS coverage is good to perform mission navigation. In this paper, a smart payload developed for navigation in the neighbourhood of structures is presented. With this payload the UAV system is able to control the distance to a structure and the angle formed by the UAV and the structure in the horizontal plane. This payload has been calibrated in order to determine the calibration curve and measure the accuracy of the payload. The system has been tested in an indoor environment (GPS-denied). Good position and angular results has been obtained.</p>

Comparative Study of the Indoor Thermal Environment of Three Rural Residences in Southwest Region of Shandong Province

2012 ◽  
Vol 433-440 ◽  
pp. 1828-1835
Author(s):  
Li Li Zhang ◽  
Yi Xun ◽  
En Shen Long ◽  
Jin Long Ouyang ◽  
Li Li Zhang
Keyword(s):  
Thermal Environment ◽  
Shandong Province ◽  
Cold Climate ◽  
Outdoor Environment ◽  
Indoor Thermal Environment ◽  
Southwest Region ◽  
Rural Residences ◽  
Heat And Moisture ◽  
Indoor And Outdoor

In the southwest region of Shandong province, villagers spontaneously adopt various ways to resist the cold climate in winter. In this paper, first we selected three typical rural residences in the region as case buildings. The three residences respectively use different heating ways for better indoor thermal environment, honeycomb briquette, Kang and furnable-heating. Then, we measured and compared the heat and moisture parameters of indoor and outdoor environment of the three residences. Finally, with the results of measurement and comparison, we proposed some methods to improve indoor thermal environment of rural residences, and economical ways of heating to enhance quality of villagers life, and provide technical support for new rural construction.

Study on Sustainable Use of Raw Soil Material in Rural Houses Design in Western China

2012 ◽  
Vol 476-478 ◽  
pp. 1714-1717 ◽  
Author(s):  
Liang Bin Tan
Keyword(s):  
Building Material ◽  
Indoor Environment ◽  
Building Materials ◽  
Sustainable Use ◽  
Point Of View ◽  
Outdoor Environment ◽  
Western China ◽  
Soil Material ◽  
Ecological Building ◽  
Indoor And Outdoor

Raw soil is a kind of good ecological building material. But in fact abundant adobe houses in Western China have many defects such as bad indoor environment. This paper discusses from the point of view the ecological characteristics and thinks of that these defects are not the fault of soil itself but the limitation of its constructor’s knowledge. So the author analyses the indoor and outdoor environment of adobe houses and proposes new points that raw soil is a sustainable material which could be absolutely used in rural houses of Western China and at the same time its economic effectiveness is incomparable to other building materials.

scholarly journals THE 3D SURVEY OF THE ROMAN BRIDGE OF SAN LORENZO IN PADOVA (ITALY): A COMPARISON BETWEEN SFM AND TLS METHODOLOGIES APPLIED TO THE ARCH STRUCTURE

2019 ◽  
Vol XLII-2/W15 ◽  
pp. 255-262
Author(s):  
F. Carraro ◽  
M. Monego ◽  
C. Callegaro ◽  
A. Mazzariol ◽  
M. Perticarini ◽  
...  
Keyword(s):  
Laser Scanning ◽  
Point Clouds ◽  
3D Models ◽  
San Lorenzo ◽  
Close Range ◽  
3D Photogrammetry ◽  
Survey Methodologies ◽  
Peculiar Case

<p><strong>Abstract.</strong> 3D survey methodologies are widely applied to the Cultural Heritage, employing both TLS and close-range photogrammetry with SfM techniques. Laser scanning produces models with high metric reliability and accuracy, whereas the main quality of the 3D photogrammetry is the result in term of photorealistic representation. Many studies have been conducted about the comparison and the integration of these different approaches and the aim of this paper is to contribute with a peculiar case study: the underground Roman bridge of San Lorenzo in Padova (Italy). The investigation regards the resulting point clouds of the intrados (or inner curve) of the central arch, comparing them and providing graphical and analytical outputs. The proposed workflow has the purpose to be a simple but valid tool to detect and evaluate geometrical differences, their significativity and the reliability of the 3D models.</p>

scholarly journals Accuracy assessment of terrestrial laser scanning and digital close range potogrammetry for 3D cultural heritage

2021 ◽  
Author(s):  
Abdullah Taha Ahmed Albourae
Keyword(s):  
Cultural Heritage ◽  
Laser Scanning ◽  
Reference Data ◽  
Accuracy Assessment ◽  
Terrestrial Laser Scanning ◽  
First Case ◽  
Culture Heritage ◽  
Close Range

There are various surveying techniques used in the field of cultural heritage documentation. Close Range Photogrammetry (CRP) and Terrestrial Laser Scanning (TLS) techniques have been widely used in 3D modeling applications. Various research studies integrate these techniques to enhance the quality of the data acquired. The main objective of this research is to assess the accuracy of TLS and CRP. The two methods are applied to two culture heritage case studies, which are located in the historic district in Jeddah, Saudi Arabia. The data obtained from both techniques is compared with data captured using traditional surveying techniques as reference data. The results show that TLS tends to be more accurate than CRP. In the first case study (Bab Makkah), CRP and TLS produced 0.044 m and 0.008 m overall RMS error, respectively; while CRP produced 0.025 m and TLS produced 0.021 m in the second case study (Bab Sharif).

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