All Articles

79 articles listed in reverse chronological order. View articles by field type using links on the right.

A comparison of reverse projection and PhotoModeler for suspect height analysis
02/22/2021 | Eugene Liscio, Helen Guryna, Quan Lea, Angela Olverb
Forensic Science International
Applications: All and Forensics & Accident Recon.

The purpose of this study was to compare the accuracy and precision between the Reverse Projection and PhotoModeler methods for suspect height analysis. Thirty analysts were assigned to measure the heights of three different suspects, one for each method, with the suspects having been recorded standing at three different distances in a scene. Reverse Projection yielded a greater range of error and tended to have higher standard deviations than PhotoModeler, but the overall accuracy between the two methods was found to be comparable. The majority of absolute measurement errors for both methods were less than 2 cm.

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The effects of camera resolution and distance on suspect height analysis using PhotoModeler
01/01/2021 | Angela M. Olver, Helen Guryn, Eugene Liscio
Forensic Science International / Volume 318
Applications: All and Forensics & Accident Recon.

The purpose of this study was to examine how camera resolution and suspect-camera distance affect the accuracy and precision of suspect height estimations using PhotoModeler software. Interaction plots demonstrated little difference in errors for most resolutions and positions. The accuracy and precision of height estimates began to decrease with resolutions under 960H and distances over 36.5 m.

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The Case for Photogrammetry in Maritime Surveys
12/01/2018 | Jean Sans
The Report -
Applications: All, Engineering & Science, Industrial Measurement, Magazine Articles, and Surveying

“In this interview, we talk to Jean Sans of Experts-Yachts about the uses of photogrammetry in maritime surveys. An early adopter of the technology, Jean has been employing photogrammetry in his practice since 1983.”

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An evaluation of three-dimensional photogrammetric and morphometric techniques for estimating volume and mass in Weddell seals Leptonychotes weddellii
01/10/2018 | Roxanne S. Beltran , Brandi Ruscher-Hill, Amy L. Kirkham, Jennifer M. Burns
Applications: All and Biology

Body mass dynamics of animals can indicate critical associations between extrinsic factors and population vital rates. Photogrammetry can be used to estimate mass of individuals in species whose life histories make it logistically difficult to obtain direct body mass measurements.

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Physical scale model testing of a flexible membrane wave energy converter: Videogrammetric analysis of membrane operation
12/01/2017 | Jarrah Orphin, Alan Fleming & Cam Algie
International Journal of Marine Energy
Applications: All and Engineering & Science

Renewable energy, aside from the environmental benefits, is increasingly making economic sense. Wave energy is a viable form of renewable energy. In small-scale testing of wave energy converters (WEC), a key focus is on characterising the relationship between the primary converter and simulated power take-off system. If primary conversion is via the deformation of a flexible material, this task often requires non-contact measurement. In this paper, the authors introduce the development of an underwater non-contact measurement technique called videogrammetry, and its novel application to characterise the primary converter operation of a flexible membrane WEC.

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Pixel Sleuths – Why the fascinating world of forensic animation is ready for its close up
09/28/2017 | Michael Mayda
The Forensic Gazette
Applications: All and Forensics & Accident Recon.

Mr. Mayda, a long-time user of PhotoModeler, explains how photogrammetry, and animation based on that photogrammetric modeling, is being used in forensics.

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Sullivan Eastern Inc. Explores UAV Photogrammetry in their Construction Business
09/12/2017 | Alan Walford
Commercial UAV News
Applications: All, Engineering & Science, Geology & Mining, and UAS / UAV / Drone

A construction company based in North Carolina incorporates new drone photo technology with advanced software to calculate stockpile volumes quickly and efficiently, and in addition, create site topographic data.

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Photogrammetry Accelerates Creation of Marine Enclosures
08/14/2017 | Jerry Fireman
Marine Link
Applications: All and Industrial Measurement

Photogrammetry helps reduce the time to create marine enclosures and covers. Costa Marine Canvas specializes in producing high-end, custom marine furniture, soft goods, enclosures, and covers. One of the most difficult of those tasks is creating windscreen enclosures for large and complex fly-bridge structures. A typical flybridge enclosure might have five 5-foot tall panels, ranging in various lengths, and combined to be 20 feet or more. While basic in appearance, each panel consists of 20 or more complex pieces of various materials fastened together by adhesives and sewing to fit and fasten to the bridge structure.

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Extracting Accurate Measurements from Single Surveillance Camera Images
06/15/2017 | Eugene Liscio
Applications: All and Forensics & Accident Recon.

PhotoModeler can solve important information about the single camera and the scene at the time of the crime, by using the image captured at the time of the crime, and combining that with 3D data captured after the crime.

In this paper a detailed method is described using PhotoModeler to ‘marry’ the detail of a 3D laser scan with one still from a security camera, and then exported to 3D Studio Max for further analysis.

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Survey of Ely Bridge, Monticello, Iowa
12/19/2016 | Harold Schuch, PE
Applications: All, Engineering & Science, and Surveying

The purpose of this project was to assess the feasibility to restore the Ely Bridge in Monticello, Iowa, a structure listed in the National Register of Historic Places. The author was invited by the Department of Civil Engineering of the University of Colorado, Denver, to create a three-dimensional scaled wire frame of the bridge to be used in a finite-element stress analysis. This report describes the effort of creating this digital three-dimensional wire frame, using photogrammetric tools. This

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