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www.photomodeler.com. Ýst zwar ein viel umfangreicheres programm aber kannst ja die Trial version runterdladen.
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Accident Reconstruction
This project demonstrates the ability of PhotoModeler to extract information from a single photo of a skid mark from an unknown source. Using only this photo and some control points, we determined the length and shape of the skid mark.
The first step was to gather some known 3D infomation from the existing scene that also appeared on this photo. We suveyed the scene to generate this control point information. We then marked the control points on the single photo, and performed Inverse Camera. Inverse Camera uses the control points to determine the characteristics of the unknown camera. These control points were not on the skid mark itself as the skid mark would normally be gone by the time of the survey. Instead, the control points are on features that exist in the photo and the scene as it stands today, with emphasis on extracting the surface of the road. Items such as divider lines, sidewalk *****s, and signs are typically used for control points.
With the camera solved, we were able to continue work on the project. We connected the various control points with Surfaces. With the surfaces covering the road, we used Surface Draw to trace the shape of the skid mark. Surface Draw allows us to mark on a surface in an oriented photo and 3D point locations are calculated. We were then able to measure the length of the skid mark using PhotoModeler's Measure tool.
The final step was to export the surface information as an orthographic photo. PhotoModeler's Ortho Photo Export removes perspective and shape distortion from the image. This allows us to see the true shape of the skid mark.
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Gruß Sebastian ,FFM
