Mulger bill wrote:exadios wrote:jules21 wrote:i'm going to start a camera thread/FAQ to (allow people to contribute to) clarifying these myths.
you're right that a camera cannot measure the precise distance a vehicle passes from you, but i wouldn't agree they "make(s) any observations based on the video useless".
Actually, the modern cameras that are available are precision instruments. And contained within the video is all the information required to make an accurate determination of passing distance. However, the data needs to be calibrated for this observation to be true.
Fully Automatic Camera Calibration Using Self-Identifying Calibration Targets[url]
Camera calibration using OpenCV
There are a number of engineering and procedure papers elsewhere. You can find them.