Application of multi-resolution 3D techniques in crime scene documentation with bloodstain pattern analysis

Area of Science:

• Forensic Science
• 3D Imaging Technology
• Bloodstain Pattern Analysis (BPA)

Background:

• Traditional forensic photography lacks high-resolution detail for evidence like bloodstains.
• Non-invasive, comprehensive crime scene documentation is crucial for forensic investigations.

Purpose of the Study:

• To propose and validate a hierarchical 3D scanning platform for crime scene documentation.
• To integrate multi-resolution scanning for detailed bloodstain pattern analysis (BPA).

Main Methods:

• A top-down hierarchical 3D scanning approach was developed, integrating laser scans from various positions.
• Software with point cloud processing algorithms controlled scanning devices for overall scene and close-up evidence documentation.
• The platform was tested on a simulated murder scene by BPA experts.

Main Results:

• The multi-resolution 3D model facilitated virtual scene exploration, distance measurements, and realistic evidence preservation.
• High-resolution scans enabled detailed analysis of bloodstains and visualization of BPA results like trajectories and area of origin.
• The platform proved effective for crime scene documentation combined with BPA.

Conclusions:

• The hierarchical 3D scanning platform offers a significant advancement in crime scene documentation, particularly for bloodstain pattern analysis.
• The resulting accurate 3D models enhance the analysis of evidence and spatial relationships within a crime scene.
• Limitations of the current 3D scanning technique were identified for future development.