Search Results

Computerized photogrammetry as it relates to accident reconstruction is well known and has been documented by a number of researchers. Planar photogrammetry algorithms have been demonstrated to be adequate for a large number of situations involved in reconstruction. These algorithms all transform individual points in the photographic image plane to a plane associated with the objects of interest. The points are then presented in either tabular and/or line drawing form. This paper presents a planar method of rectifying an entire photographic image to the horizontal plane, so that the resulting rectified image can be viewed from directly overhead or from any other perspective. The method has specific advantages in analyzing accident scene photos containing skid marks, gouges, and other evidence, without the inconvenience of perspective distortion. The method also dramatically increases the volume of data which can be conveniently analyzed.

An offshoot of our research in the area of accident reconstruction has been the development of economical computerized graphic simulation techniques. Three-dimensional images are mathematically reconstructed on the computer screen. Building a sequence of these images and animating them is a means of simulating motion. A special approach is taken to facilitate real time playback using a desk top microcomputer. These dynamic simulations are a very effective means of presenting a complex sequence of events to a non-technical audience in a clear and understandable fashion. The equations used in a rigorous engineering analysis are modeled graphically for analysis by the viewer. Different scenarios of the same incident can be developed to show the credibility of various statements. This is done through modifying individual variables, such as speed, distance, timing, and camera location to determine the effect of the change on the final result.