Calibration of the Period and Time Difference of Synchronized Flashing Lights

Abstract

Videos recorded by CCTVs or car cameras are often tendered as evidences in legal proceedings and traffic accident investigations. Important information such as vehicle speed may be estimated from the video data to support the case. In such applications, to satisfy the standard of proof in a court of law, the timing parameters of the cameras must be calibrated. A specially designed frame interval timer called the Lightboard is being used in some jurisdictions to determine the frame interval of video recorded by a camera. The accuracy of the time base in this frame interval timer in turn need to be calibrated. This paper proposed methods to calibrate the flashing period and the time difference between two synchronized LED panels of a Lightboard system.