Introduction

Highlighted terminology is explained at the bottom of the page.

 

With the increasing amount of CCTV installations and in-car Digital Video Recorders (DVRs/dashcams) there are many opportunities for our clients to have incident associated digital video evidence objectively analysed.

Ordinarily, our clients require the determination of travel speeds during the pre-collision phase. However, there are often further informative conclusions that can be gained. It is vitally important that the composition of the recorded evidence be understood so that it can be analysed for correlation with the collision sequence, collision dynamics and the identified collision scene evidence.

We use a variety of software to critically analyse the supplied digital video evidence. Our previous work has identified variable and inconsistent frame rates, inconsistent frame sequences, motion blur, rolling shutter distortion, incorrect time stamps, parallax and barrel distortion.

The precision and verifiability of digital video evidence influence the accuracy of any speed analysis and the time-distance based relationship of the collision sequence.

Where necessary we use computer simulation to recreate the video evidence having 3D laser scanned the incident site. The computer simulations allow an objective examination to determine the precise correlation of the digital video evidence through a time-distance based relationship.

Determination of speeds from digital video evidence is dependent on the complexity of the incident, the dynamics of the subject, any correlating time-distance checks, the field of view, identifiable road geometry, the incident location and the investigative methods employed.

While some of our investigations are achieved through desktop analysis, there are occasions when we need to inspect and conduct accurate measurements at the incident location. When required, we use VBOX 20Hz GPS speed data during our drive-throughs to provide accurate correlation with our employed methodology. We strongly suggest our clients take full advantage of 3D laser scans as these provide both a qualitative and quantitive model to use in our analysis. Often this digital video analysis service coincides with other investigative reconstruction methods.

Digital Video CCTV Analysis
Digital Video CCTV Analysis
Digital Video CCTV Analysis
Digital Video CCTV Analysis

 

Fees & Lead Times

Our service level agreements for fees and lead times for our digital video analysis service vary due to the complexity of each case and any additional investigative services required.

This service is part of our all inclusive investigative reconstruction package.

Please contact us to discuss your requirements.

 

Terminology

Barrel Distortion - An optical aberration caused by the deviation from a rectilinear projection.

CCTV – Closed-Circuit Television.

Collision Dynamics – The forces and motions occurring during a collision due to the interaction and engagement of collision-involved vehicles, objects or persons.

Collision Scene Evidence – Evidence from the collision scene concerning the pre-collision and collision phases.

Collision Sequence – The chronological sequence of events involving the collision-involved vehicles, objects or persons.

Computer Simulation – The reproduction of the behaviour of a system using a computer to simulate the outcomes of a mathematical model.

Field of View –The extent of the observable area.

Frame Rate – The frequency at which consecutive frames are displayed.

Motion Blur – A streak-like effect of a sequence of frames caused due to moving subjects and relative long exposures.

Parallax – The apparent displacement of the true position of an object when viewed along differing sightlines.

Pre-Collision Phase – The actions and movements of the collision-involved vehicles, objects or persons prior to the impact phase of the collision.

Precision – The precision of a measurement refers to how well it agrees with each other in multiple tests.

Road Geometry – The geometric design of roads concerned with the positioning of the physical elements of it according to standards and constraints.

Rolling Shutter – The sequential scanning of a camera's sensor, which may give rise to image misalignments.

Time Stamp – A sequence of digits and/or characters identifying relative time.

Travel Speed – The speed of a collision-involved vehicle before any collision-related events.

 

 

our Services

All Inclusive Service Collision Accident

All-Inclusive Investigation
Consultancy

Consultancy
Collision Reconstruction Collision Accident

Investigative Reconstructions
Desktop Analysis Collision Accident

Desktop Analysis
Claim Validation

Claim Validations
Vehicle Examinations Collision Accident

Vehicle Examinations
Laser Scanning Collision Accident

3D Laser Scanning
Forensic Animations Collision Accident

Forensic Animations
CCTV Digital Video Analysis Collision Accident

Digital Video Analysis
Collision Site Analysis Collision Accident

Collision Site Analysis
UAV Collision Accident

UAV Aerial Imagery
Collision Accident Computer Simulations

Computer Simulations
Collision Accident Vehicle Forensics Infortainment

Vehicle Forensics
Collision Accident Crash Data Analysis

Crash Data Analysis
Collision Accident Light Bulb Analysis

Lamp Analysis
Collision Accident Seat Belts

Seat Belt Examinations
Incident Analysis

Incident Analysis
Collision Accident Photography

Site Photography
Collision Accident Scale Plan

Scale Plans
Collision Accident Report Validation

Report Confirmations
Research

Research