Determination of Vehicle Crush from Two Photographs and the Use of 3D Displacement Vectors in Accident Reconstruction

Woolley, Ronald L.; White, Karen A.; Asay, Alan F.; Bready, Jon E.

doi:10.4271/910118

Cited by 13 publications

(8 citation statements)

References 5 publications

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“…It was demonstrated using motor vehicle accident data in [12,13,16]. It is demonstrated using airplane accident data in [2] and the present study.…”

Section: Discussionmentioning

confidence: 89%

“…Computer projection has been used for motor vehicle accident reconstruction to describe damage to an accident vehicle [12] and for aircraft accident reconstruction to document damage at an accident site [2]. Impact damage documented using camera projection was compared with damage recorded using survey equipment in [16]; the maximum difference between the results for two motor vehicles was 3.1 cm. Impact damage documented using computer projection was compared with damage recorded using tape measures and survey equipment in [12]; the maximum difference between the results for two motor vehicles was 4.0 cm.…”

Section: Reverse Projection Methodsmentioning

confidence: 99%

“…Camera projection has been used for motor vehicle accident reconstruction to describe damage to an accident vehicle [16] and to document damage at an accident site [13]. Computer projection has been used for motor vehicle accident reconstruction to describe damage to an accident vehicle [12] and for aircraft accident reconstruction to document damage at an accident site [2].…”

Section: Reverse Projection Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Documentation of evidence and calculation of acceleration in aircraft accident reconstruction

Dobbs¹,

Boldrick²,

Ericson³

et al. 2011

International Journal of Crashworthiness

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This paper presents results from the reconstruction of the crash of a twin-engine, low-wing airplane on final approach. These results are used to demonstrate the reverse projection method for documenting physical evidence and the kinematic method for calculating aircraft acceleration. The documentation of evidence and the calculation of acceleration, previously shown using airplane test data, are now shown using airplane accident data. The use of reverse projection to complete the documentation of physical evidence that was not preserved is discussed.

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“…It was demonstrated using motor vehicle accident data in [12,13,16]. It is demonstrated using airplane accident data in [2] and the present study.…”

Section: Discussionmentioning

confidence: 89%

Section: Reverse Projection Methodsmentioning

confidence: 99%

Section: Reverse Projection Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Documentation of evidence and calculation of acceleration in aircraft accident reconstruction

Dobbs¹,

Boldrick²,

Ericson³

et al. 2011

International Journal of Crashworthiness

View full text Add to dashboard Cite

show abstract

“…Camera matching photogrammetry is an established technique for determining where, in a scaled three dimensional environment, an object is located that is visually represented in a two dimensional photograph [1,2,3,4]. Though a photograph is only a two dimensional image, it visually represents a three dimensional world, and techniques of camera matching photogrammetry allow the position, orientation and scale of objects visible in the photograph to be located in a three dimensional environment through laws of perspective.…”

Section: Introductionmentioning

confidence: 99%

Determining Position and Speed through Pixel Tracking and 2D Coordinate Transformation in a 3D Environment

Neale¹,

Hessel²,

Koch³

2016

SAE Technical Paper Series

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This paper presents a methodology for determining the position and speed of objects such as vehicles, pedestrians, or cyclists that are visible in video footage captured with only one camera. Objects are tracked in the video footage based on the change in pixels that represent the object moving. Commercially available programs such as PFTrack tm and Adobe After Effects tm contain automated pixel tracking features that record the position of the pixel, over time, two dimensionally using the video's resolution as a Cartesian coordinate system. The coordinate data of the pixel over time can then be transformed to three dimensional data by ray tracing the pixel coordinates onto three dimensional geometry of the same scene that is visible in the video footage background. This paper explains the automated process of first tracking pixels in the video footage, and then remapping the 2D coordinates onto three dimensional geometry using previously published projection mapping and photogrammetry techniques. The results of this process are then compared to VBOX recordings of the objects seen in the video to evaluate the accuracy of the method. Some beneficial aspects of this process include the time reduced in tracking the object, since it is automated, and also that the shape and size of the object being tracked does not need to be known since it is a pixel being tracked, rather than the geometry of the object itself. Concept of 2D Coordinate Transformation The tracking of objects in video, also called motion tracking, can be a manual or automated process where, in an x and y coordinate system determined by the video's resolution, a discrete pixel, or series of

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“…CRPP is a technique utilized by accident reconstructionists to locate information from photographs through the use of computer software. Though the mathematical theory behind the process of photogrammetry is beyond the scope of this paper, the foundation for photogrammetry and its use in accident reconstruction has previously been established in a variety of papers [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Using Computer Reverse Projection Photogrammetry to Analyze an Animation

Massa¹

1999

SAE Technical Paper Series

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Determination of Vehicle Crush from Two Photographs and the Use of 3D Displacement Vectors in Accident Reconstruction

Cited by 13 publications

References 5 publications

Documentation of evidence and calculation of acceleration in aircraft accident reconstruction

Documentation of evidence and calculation of acceleration in aircraft accident reconstruction

Determining Position and Speed through Pixel Tracking and 2D Coordinate Transformation in a 3D Environment

Using Computer Reverse Projection Photogrammetry to Analyze an Animation

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