Video Analysis

surveillance (fixed) cameras

Collision events captured by surveillance video cameras or onboard camera systems can be analyzed to derive the positions, orientations, paths and speeds of involved vehicles prior to, during and after a crash. The process of reconstructing events captured by surveillance video cameras involves a detailed 3D laser scan documentation of the site and identification of the subject camera and its location. A 3D digital CAD model of the site is generated directly from the scan data and the perspective view of the camera is matched by employing camera properties and 3D spatial data (landmarks) from the site. Vehicle positions and orientations can be determined at specific key frames and the vehicles’ paths and speeds can ultimately be derived. Our extensive experience in photogrammetry, 3D laser scanning and 3D Computer Modeling facilitate our analyses of video footage to reconstruct the events leading up to a collision event.

onboard (moving) cameras

Reconstructing events from video captured by onboard camera systems, including fleet systems, is similar to reconstructing events captured by surveillance cameras in that it also requires a detailed and accurate 3D laser scan documentation of the site. Castañeda Engineering integrates onboard camera video footage of the event with detailed 3D laser scan data of the site to determine camera position and orientation at each frame. Ultimately, the path and speed of the camera, and of the vehicle, can be derived from this information. Our Mobile 3D Laser Scanning system facilitates documentations of long stretches of busy corridors required to reconstruct a vehicle’s approach to a collision as well as other sites where the use of other scanning systems are impractical or not permissible.