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GA/T 1437-2017: Technical specifications for examination of morphological features of two-dimensional footwear impression in Forensics
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| GA/T 1437-2017 | English | 139 |
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Technical specifications for examination of morphological features of two-dimensional footwear impression in Forensics
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GA/T 1437-2017
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Basic data | Standard ID | GA/T 1437-2017 (GA/T1437-2017) | | Description (Translated English) | Technical specifications for examination of morphological features of two-dimensional footwear impression in Forensics | | Sector / Industry | Public Security (Police) Industry Standard (Recommended) | | Classification of Chinese Standard | A92 | | Classification of International Standard | 13.310 | | Word Count Estimation | 6,657 | | Date of Issue | 2017-10-02 | | Date of Implementation | 2017-10-02 | | Issuing agency(ies) | Ministry of Public Security | GA/T 1437-2017: Technical specifications for examination of morphological features of two-dimensional footwear impression in Forensics
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Technical specifications for examination of morphological features of two-dimensional footwear impression in Forensics
ICS 13.310
A92
Public Safety Industry Standard of the People's Republic of China
Forensic science plane shoes image characteristics
Inspection specifications
Published on.2017-10-02
2017-10-02 Implementation
The Ministry of Public Security
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
Please note that some of the contents of this document may involve patents. The issuing agency of this document does not assume responsibility for identifying these patents.
This standard is proposed and managed by the National Criminal Technology Standardization Technical Committee.
This standard was drafted by. Ministry of Public Security Material Evidence Identification Center, Institute of Criminal Science and Technology, Shijiazhuang Public Security Bureau, Hebei Province.
The main drafters of this standard. Li Gang, Liu Weiping, Lu Yonglong, Hu Shuliang, Shen Ziqi, Cui Jia, Bai Yanping, Fu Huanzhang.
Forensic science plane shoes image characteristics
Inspection specifications
1 Scope
This standard stipulates the principle, equipment, operation methods and requirements for the inspection of shoeprint image features.
This standard applies to the inspection of image features of plane shoes.
2 principle
Affected by factors such as manufacturing, use, maintenance, and preservation, the shoe's pattern structure, manufacturing process, modification, and defect characteristics are different.
And can be reflected in the footprint. According to the same recognition theory, shoes and individuals can be identified.
3 Equipment
Photographic equipment, video equipment, light source, electrostatic extraction equipment, serigraphy box, printing paper, gypsum powder, protractor, divider, marking pen, transparent plastic
Tablets, magnifiers, etc.
4 Operation steps
4.1 Check separately
4.1.1 Measure and calibrate on-site shoeprint features.
4.1.2 Measure and calibrate the sample shoe features.
4.1.3 Measure and calibrate the sample shoeprint feature.
Note. The length of the measurement is in centimeters and it is reserved one decimal place.
4.2 Comparison test
4.2.1 Intuitive Matching Method
Directly observe and compare features of on-site shoe prints and sample shoe prints, such as. site, shape, range, number, area, local shape, angle, size
and many more. A unique identifier should be used for the identified points of conformity and difference, clockwise or from left to right and top to bottom.
Mark and number. Footprints have different sizes and sizes, and their numbering method should be selected according to the size and area of the features.
4.2.2 Azimuth alignment method
The orientation comparison method is a positional relationship between the characteristics of the on-site shoeprint and the sample shoeprint, and determines the distribution characteristics of the two.
Match points and differences. There are two specific directions. rectangular coordinates and polar coordinates.
4.2.3 Relational Comparison Method (Drawing Composition Method)
The relationship comparison method (line drawing method) is the distance and angle relationship between shoeprint features. Inter-relationships between geometric representation features
And compare the similarities and differences between the sides, angles, areas, and shapes of the graphics. This method is suitable for comparative testing of small, deformed point features.
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