Car speed estimation based on cross-ratio using video data of car-mounted camera (black box)

In traffic accident reconstructions, using car black box footages to approximate the speed of cars involved is an important process which is commonly conducted. Traditional method in this process involves recognizing the distance that is clearly visible in the recorded footage, then measuring the time the car of interest passes through that distance to estimate its speed. However, when there are no clear lane markings or landmarks that can specify the location of the car, speed estimation is either impossible or lacks accuracy.
Source: Forensic Science International - Category: Forensic Medicine Authors: Source Type: research