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GA/T 1675-2019: Forensic sciences--Methods for lifting water footprint
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Forensic sciences--Methods for lifting water footprint
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GA/T 1675-2019
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Basic data | Standard ID | GA/T 1675-2019 (GA/T1675-2019) | | Description (Translated English) | Forensic sciences--Methods for lifting water footprint | | Sector / Industry | Public Security (Police) Industry Standard (Recommended) | | Classification of Chinese Standard | A92 | | Classification of International Standard | 13.310 | | Word Count Estimation | 6,614 | | Date of Issue | 2019 | | Date of Implementation | 2019-12-01 | | Issuing agency(ies) | Ministry of Public Security | GA/T 1675-2019: Forensic sciences--Methods for lifting water footprint---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Forensic sciences--Methods for lifting water footprint
ICS 13.310
A92
Public Safety Industry Standards of the People's Republic of China
Forensic plane watermark footprint extraction method
Published on October 14,.2019
2019-12-01 Implementation
Issued by the Ministry of Public Security of the People's Republic of China
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
Please note that some content of this document may involve patents. Publication of this document
The institution does not assume responsibility for identifying these patents.
This standard was proposed by the National Criminal Technology Standardization Technical Committee Trace Inspection Sub-Technical Committee (SAC/TC179/SC5) and
Be in charge.
This standard was drafted by. People's Public Security University of China, Physical Evidence Appraisal Center of the Ministry of Public Security, Beijing Police College.
The main drafters of this standard. Yang Lei, Ban Maosen, Liu Jin, Xu Shaohui, Lu Xilong, Chen Ruili, Wang Yue, Liu Huan.
Forensic plane watermark footprint extraction method
1 Scope
This standard stipulates the basic method of extracting watermark footprints in the field of forensic science.
This standard applies to the extraction of planar water footprints in the field of forensic science.
2 Normative references
The following documents are essential for the application of this document. For dated references, only the dated version applies to this article
Pieces. For the cited documents without date, the latest version (including all amendments) applies to this document.
GA/T 117-2005 Requirements for on-site photography and video recording
GA/T 419-2018 General Technical Requirements for Forensic Science "502" Fingerprint Smoked Display Cabinet
GA/T 582-2005 on-site photography method rules
GA/T 591-2006 Technical Conditions of Criminal Photographic Equipment
GA/T 936-2011 Forensic Science Plane Dust Trace Potassium Ferricyanide Enhanced Method
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Watermark footprint
When there is water on the surface of the shoes, socks, bare feet, etc., or when there is water on the surface of the object, when the two are in contact, the mixture of water and dust
The footprint formed.
4 Extraction method
4.1 Photographic extraction method
4.1.1 Applicable objects
Watermark footprint on smooth flat object.
4.1.2 Principle
When the light source irradiates the object surface of the watermark footprint at a certain angle, the smooth object has a directivity to the light reflection, and the part with watermark
Diffuse scattering causes the two to form different reflection effects. The optical axis of the camera lens is perpendicular to the footprint plane, by controlling the angle of incidence of light
Degree, form and record the brightness difference and chromaticity difference of the smooth surface and water stained part in the lens direction.
4.1.3 Instruments and equipment
Should meet the requirements of GA/T 591-2006.
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