Case Study – Laser Scanning in CCTV analysis
The case study below follows on from the Complex Collision Reconstruction case study and illustrates how Advanced Simtech is able to add value through the application of 3D Laser Scanning.
In this case a CCTV camera covered a section of a collision scene but the footage offered limited information as there were merely a few low resolution frames that were relevant to the incident.
Using a laser scan of the scene, it was possible to take the 2 dimensional CCTV images into a 3D environment and derive useful position data.
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Case Study – Fatal RTC Analysis
Customer: UK Police Force
Low quality CCTV captured the final moments of a serious collision in which one occupant was killed and another was ejected from the vehicle relatively unhurt. In the footage it was possible to observe the ejected occupant standing up and walking along the scene.
As part of our investigation, we aimed to determine the position of the ejected occupant at the moment when he first became visible in the CCTV footage. This would supplement our simulation work by providing an approximate ejection point and therefore aid our understanding of the sequence of events relating to how he was ejected.
A single frame from the CCTV footage is shown below. The ejected occupant has been highlighted.
A 3D laser scan of the scene had previously been carried out. This scan included the area covered by the CCTV camera.
Using specialised software, the CCTV still image can be applied to the laser scan by selecting common points between them to create a ‘texture map’.
Texture mapped scan:
With the CCTV image applied to the scan, it was then possible to identify the post impact position of the ejected occupant in a detailed 3D scene model. This allowed us to confirm that the only opportunity for an occupant to leave the vehicle without being subsequently struck or ran over by it is following the rebound from the tree impact.
Using the positional data in conjunction with our detailed simulation allowed us to be confident in our prediction for the timing of ejection from the vehicle by providing a further means of correlation for the occupant simulation work.
With ever increasing applications, specialized software and highly advanced methodologies; contact Advanced Simtech today to find out how we could benefit your organization.
As of the start of July 2020, we are now also the UK distributor for Applanix land systems. Providing robust position and orientation solutions for sensors and vehicles. Industry-leading GNSS-aided inertial technology, and Direct Georeferencing of imaging devices sensor fusion and complex systems
If you have any questions about any of our specialist engineering services including Occupant Biomechanics, Vehicle Safety Systems such as restraints and airbags, Advanced Driver Assistance Systems (ADAS), Autonomous Vehicles or 3D Data Capture and Processing, please do not hesitate to get in touch. Our knowledgeable, professional, and experienced team is always on hand to answer any of your questions.Alscot Estate, Atherstone Hill, Atherstone on Stour
Stratford Upon Avon, CV37 8NF
Tel: +44 (0) 1789 264 782
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Advanced Simtech is an privately owned engineering consultancy specialising in the areas of human biomechanics, vehicle safety and real world accident reconstruction.