Hazmap: A Remote Digital Measurement System for Work in Hazardous Environments

Chapman, Dave; Deacon, A. T.; Hamid, Abdul

doi:10.1111/j.1477-9730.1994.tb00788.x

Cited by 10 publications

(4 citation statements)

References 1 publication

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“…The second system, intended for higher radiation areas with limited access, used a spherical array of cameras that could very rapidly capture a panoramic mosaic of lower resolution. At the time, the unit cost of CCD cameras meant that this latter approach was too expensive for routine deployment, so most projects were undertaken using the video-theodolite technique (Chapman et al, 1994).…”

Section: Photogrammetry and Facility Managementmentioning

confidence: 99%

Megapixels, Millimetres and Microsieverts: Packaging Digital Photogrammetry for Emerging Industrial Markets

Chapman

2000

The Photogrammetric Record

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As the performance of megapixel digital imaging systems continues to improve, the rapid growth of high-end consumer markets drives prices ever lower. When such cameras are married with emerging, desktop "photogrammetric" software packages, the close range photogrammetric community is faced with many new challenges and opportunities. The dramatic changes in the technological arena are matched by a rapidly changing business environment in which concepts such as "Partnering" and "Supply chain management" have become key themes. As organizations of all sizes seek to thrive within this new business landscape, there appears to be a willingness to think more flexibly about the client-supplier relationship and the sharing of risks and rewards. This, in turn, has encouraged the development of highly customized measurement solutions across a wide range of market sectors. In each of these solutions the emphasis is not on a generic photogrammetric product, but on a highly tailored system tightly coupled to existing workflows, and focused on the specific needs of the client. Such systems pose particular challenges to their designers, since they are frequently operated by users with relatively little photogrammetric background and yet must always meet the challenging requirement of producing an output which is "fit for purpose". Thus this paper hopes to show how novel megapixel imaging systems can be configured to deliver flexible measurement systems capable of millimetric level accuracy within the challenging engineering environments typical of the nuclear and process industries (hence the microsievert component of the title).

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Section: Photogrammetry and Facility Managementmentioning

confidence: 99%

Megapixels, Millimetres and Microsieverts: Packaging Digital Photogrammetry for Emerging Industrial Markets

Chapman

2000

The Photogrammetric Record

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“…A semi-automatic approach was adopted to measure the image co-ordinates of the projected dots. Results of image co-ordinate measurements in the Hazmap (Chapman et al, 1994) environment were used as initial estimates for the template matching. A combination of dot matrix co-ordinates, orientation parameters of the projector and the angles of the geodimeter gave a direction for each laser dot from the projector end, while the combination of the image co-ordinates of the laser dots, orientation parameters of the camera and the angles of the geodimeter gave another direction for each dot from the camera end.…”

Section: Case Studymentioning

confidence: 99%

“…Difficulties of these matching algorithms increases further for a featureless and low texture object. Digital photo- grammetry is considered as a promising technique for remote inspection and measurement of hazardous areas (Chapman et al, 1994) but the limitations of the stereomatching techniques during identification of corresponding points in stereopairs at close range provide an opportunity for active triangulation techniques to be used for such measurements. Light projections have been practised a number of times for different automatic measurement purposes like robotic vision (El-Hakim, 1985) and measurement of dynamic textureless objects (Ethrog, 1991) but most of them adopted complicated design and calibration procedures.…”

Section: Introductionmentioning

confidence: 99%

Digital Photogrammetry for Automatic Close Range Measurement of Textureless and Featureless Objects

Singh

Chapman

Atkinson

1997

The Photogrammetric Record

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Diffraction grating based simultaneous projection of a large number of distinct and circular laser dots was adopted to solve correspondence and accuracy problems during automatic three dimensional measurement of a textureless and featureless object at close range. After rigid placement of the projector over the telescope of a geodimeter, accurate calibration and derivation of a camera model of the virtual active camera (the projector) was done without a control field and using a bundle adjustment procedure. While automatic detection and labelling of the actively placed target points over any given object remained a problem, algorithms were developed to locate and label these target points placed over a nearly flat and textureless surface. A conventional thresholding method was combined with least squares matching (LSM) to provide automatic subpixel image co-ordinate measurement of the target points placed over a textureless object but, considering the real object conditions, semi-automatic image co-ordinate measurement was done by LSM. The system provided an intersection parallax of 0·3 mm during a laboratory test scan of a planar object at 4·5 m distance.

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“…A system of note from the close-range photogrammetry domain is Hazmap; originally developed to facilitate the capture and parametric modelling of complex nuclear plants in the 1990s [10]. Hazmap consisted of a panoramic imaging system using calibrated cameras attached to a robotic total station.…”

Section: Introductionmentioning

confidence: 99%

Automatic Geometry Generation from Point Clouds for BIM

2015

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Abstract:The need for better 3D documentation of the built environment has come to the fore in recent years, led primarily by city modelling at the large scale and Building Information Modelling (BIM) at the smaller scale. Automation is seen as desirable as it removes the time-consuming and therefore costly amount of human intervention in the process of model generation. BIM is the focus of this paper as not only is there a commercial need, as will be shown by the number of commercial solutions, but also wide research interest due to the aspiration of automated 3D models from both Geomatics and Computer Science communities. The aim is to go beyond the current labour-intensive tracing of the point cloud to an automated process that produces geometry that is both open and more verifiable. This work investigates what can be achieved today with automation through both literature review and by proposing a novel point cloud processing process. We present an automated workflow for the generation of BIM data from 3D point clouds.We also present quality indicators for reconstructed geometry elements and a framework in which to assess the quality of the reconstructed geometry against a reference.

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Hazmap: A Remote Digital Measurement System for Work in Hazardous Environments

Cited by 10 publications

References 1 publication

Megapixels, Millimetres and Microsieverts: Packaging Digital Photogrammetry for Emerging Industrial Markets

Megapixels, Millimetres and Microsieverts: Packaging Digital Photogrammetry for Emerging Industrial Markets

Digital Photogrammetry for Automatic Close Range Measurement of Textureless and Featureless Objects

Automatic Geometry Generation from Point Clouds for BIM

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