Forensic Imaging Module for Bullet Casing Analysis
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Solution Overview
Problem
Current systems for collecting and analyzing forensic evidence from gun-related crimes face delays due to transit times and limitations in imaging metallic surfaces of bullet shells, as existing technologies struggle with non-Lambertian reflectance and require intermediary coatings or gel membranes, which reduce resolution and accuracy.
Innovation Solution
The use of a forensic imaging apparatus with a low glancing angle illumination scheme and image acquisition software that can handle specularly reflective surfaces, allowing for high-resolution 3D surface reconstructions without intermediary coatings, and can be deployed as a mobile unit for real-time documentation and analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional imaging systems (confocal microscopes, structured light laser scanners) are used to image metallic bullet shell surfaces, then imaging capability is provided, but the systems require intermediary aerosol coatings or gel membranes that perturb the surface and limit maximum resolution
Solution Approach 1:
The patent removes the intermediary coating layer from the imaging process by using low glancing angle illumination that can directly capture surface features of metallic objects without requiring aerosol coatings or gel membranes, thereby eliminating surface perturbation and achieving higher resolution
Solution Approach 2:
The patent changes the illumination angle parameter to a low glancing angle (near-parallel to the surface), which enables direct imaging of metallic surfaces by exploiting the relationship between illumination angle and surface reflectance characteristics, avoiding the need for intermediary layers
2Adaptability or versatility
If digital processing techniques for non-Lambertian surfaces are used, then imaging of glossy surfaces is attempted, but the techniques fail when imaging metal surfaces with non-linear anisotropic BRDF and multiple facets due to ambiguous normal reflections and self-illumination
Solution Approach 1:
The patent applies local quality by using different illumination strategies for different surface regions - low glancing angle illumination specifically targets areas with ambiguous reflections and self-illumination, allowing the imaging system to reliably capture features on faceted metallic surfaces where conventional techniques fail
3Measurement precision
If off-site central processing locations are used for forensic analysis, then comprehensive ballistic imaging and database comparisons are performed, but delays occur due to transit time, limited imaging resources, and case backlogs
Solution Approach 1:
The patent creates a universal imaging system that can be deployed at multiple locations (crime scenes, laboratories, and central processing facilities) performing the same high-resolution ballistic imaging function, eliminating the need to transport evidence and enabling parallel processing of cases across different jurisdictions
Solution Approach 2:
The patent creates high-resolution digital copies of bullet shell surfaces through advanced imaging techniques, allowing these copies to be transmitted and analyzed remotely without moving the physical evidence, thereby eliminating transit delays while maintaining analysis accuracy
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables rapid, on-site analysis of bullet casings, reducing the need for laboratory processing, improving lead generation in criminal investigations, and facilitating quicker prosecution, while also being cost-effective and accessible for various law enforcement agencies.
Implementation Method 1
The light source is arranged to illuminate the bullet casing head at a low glancing angle
Data Source
AI summary
Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for a forensic imaging apparatus for documentation, forensic analysis, and reporting of bullet casings. In one aspect, an assembly includes an adaptor for attaching the assembly to a user device, a housing defining a barrel extending along an axis and attached to the adaptor and having an opening that is sufficiently large to receive a firearm cartridge casing, and a holder for holding the firearm cartridge casing at an illumination plane within the barrel. Light sources are arranged within the housing and to direct light to illuminate the illumination plane, the light sources including a first light source arranged to illuminate the illumination plane at a first range of glancing incident angles.