Impact Mark Analysis Using Image Outlining and Database Matching
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Solution Overview
Problem
Current methods for analyzing impact marks at crime scenes are limited by the difficulty in accurately determining the three-dimensional tools used in crimes from two-dimensional impact marks developed using amino acid reaction reagents, as they only provide outline information of collision areas.
Innovation Solution
An apparatus and method that involve photographing and outlining impact marks, registering these outlines in a database, and searching for matching images to determine the type of tool used, utilizing image processing techniques like grayscale conversion and binarization to enhance tool outline extraction and matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If amino acid reaction reagent is applied to develop impact marks, then the impact marks become visible and can be photographed, but only two-dimensional outline information is obtained making it difficult to accurately determine the three-dimensional tool used
Solution Approach 1:
The patent applies three-dimensional reconstruction technology to convert two-dimensional impact mark images into three-dimensional tool models. By capturing multiple two-dimensional images from different angles and using computational algorithms, the system reconstructs the original three-dimensional tool shape, thereby recovering the lost dimensional information and improving tool identification accuracy.
Solution Approach 2:
The patent creates digital copies of the impact marks through high-resolution photography and scanning, then generates three-dimensional digital models that replicate the physical tool's shape. These digital copies preserve the outline information while adding spatial dimensions, allowing accurate tool identification without losing the original three-dimensional characteristics.
2Device complexity
If only outline information of impact marks is captured, then the analysis process is simplified, but the ability to accurately determine the specific tool used is compromised
Solution Approach 1:
The patent segments the analysis process into distinct stages: image acquisition, outline extraction, three-dimensional reconstruction, and database matching. By dividing the complex analysis into manageable segments, the system maintains simplicity in each individual step while achieving high precision in the overall tool identification process through the cumulative effect of all segments.
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 allows for more accurate identification of tools used in crimes by displaying matched outline images and related tool characteristic information, improving the analysis of assault and murder cases by providing reliable tool identification.
Implementation Method 1
When an amino acid reaction reagent is applied to an inner surface of the clothing in contact with the skin, sweat components from the skin in contact with the clothing are developed, making it possible to visualize shapes and traces of various tools or objects used in the crime.
Data Source
AI summary
A developed impact mark analysis apparatus includes: an image acquisition unit configured to obtain at least one first image by photographing impact marks that are developed, and to obtain a second image of impact marks at a crime scene that are developed from evidence at the crime scene; an outliner configured to outline the at least one first image to obtain at least one first outline image, and to outline the second image to obtain a second outline image; a database configured to store the first outline image corresponding to related tool characteristic information; a matching unit configured to search the database for the first outline image determined to be similar to the second outline image and match them with each other; a display unit; and a user input unit.