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GA/T 1690.2-2019: Forensic sciences--Examination methods for seal stamps -- Part 2: Overlapping and comparison
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GA/T 1690.2-2019 | English | 139 |
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Forensic sciences--Examination methods for seal stamps -- Part 2: Overlapping and comparison
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GA/T 1690.2-2019
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Basic data | Standard ID | GA/T 1690.2-2019 (GA/T1690.2-2019) | | Description (Translated English) | Forensic sciences--Examination methods for seal stamps -- Part 2: Overlapping and comparison | | Sector / Industry | Public Security (Police) Industry Standard (Recommended) | | Classification of Chinese Standard | A92 | | Classification of International Standard | 13.310 | | Word Count Estimation | 6,620 | | Date of Issue | 2019-10-14 | | Date of Implementation | 2019-12-01 | | Issuing agency(ies) | Ministry of Public Security | GA/T 1690.2-2019: Forensic sciences--Examination methods for seal stamps -- Part 2: Overlapping and comparison
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Forensic sciences--Examination methods for seal stamps - Part 2.Overlapping and comparison
ICS 13.310
A92
Public Safety Industry Standards of the People's Republic of China
Forensic Science Seal Seal Test
Part 2.Coincidence comparison 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
GA/T 1690 "Forensic Science Seal Seal Test" is divided into 6 parts.
---Part 1.Microscopic inspection method;
---Part 2.Coincidence comparison method;
---Part 3.Detailed feature comparison method;
---Part 4.Measurement comparison method;
---Part 5.Splicing comparison method;
---Part 6.Line drawing comparison method.
This part is part 2 of GA/T 1690.
This section was drafted in accordance with the rules given in GB/T 1.1-2009.
This part is proposed by the National Criminal Technology Standardization Technical Committee Document Inspection Sub-Technical Committee (SAC/TC179/SC10) and
Be in charge.
This section was drafted by. Tianjin Public Security Bureau, Physical Evidence Appraisal Center of the Ministry of Public Security, Tianjin People's Procuratorate, Zunyi Public Security Bureau.
The main drafters of this section. Yu Jianmin, Han Xingzhou, Xu Lu, Zhang Yazhuo, Zhao Yuanxiang, Hou Jianzhong.
Forensic Science Seal Seal Test
Part 2.Coincidence comparison method
1 Scope
This part of GA/T 1690 stipulates the method specification for the inspection of seal seals by the coincidence comparison method in the field of forensic science.
This section applies to the inspection of seals and seals in the field of forensic science.
2 Equipment
Light-transmitting board, comparison microscope, graphics (image) processing software with coincidence comparison function, document inspection instrument, copier, scanner, camera, etc.
3 Inspection
3.1 Transparency coincidence comparison
The printed text (original or copy) is superimposed on the light transmission observation to compare the coincidence.
3.2 Comparative microscope coincidence comparison
Place the matched seals horizontally on the stage and perpendicular to the optical axis, using the same magnification and brightness.
The articles are compared and compared.
3.3 Using graphics (image) processing software for coincidence comparison
Use the image (image) processing software's coincidence function to compare and compare the printed text at the same magnification.
3.4 Using the coincidence function of the document detector
Use the coincidence comparison function of the document inspection instrument to perform the coincidence comparison of the printed text under the same magnification.
4 Make inspection records
The inspection result of coincidence comparison shall be recorded in the inspection record. If necessary, you can place the overlapping comparison pictures, and the details of the overlapping parts
Label or text description of the form, relative position, etc.
5 matters needing attention
5.1 Should be combined with the material of the seal, the method of inking, the storage conditions, the use conditions, the use time, the folding of the printed text, the paper stains and other factors
Analyze the similarities and differences of coincidence.
5.2 When using translucent coincidence comparison, in order to enhance the comparison effect, the printed text can also be copied to a transparent or translucent carrier at the same magnification
Comparison.
5.3 When using graphics (image) processing software for registration and comparison, the deviation of the picture during the collection process (such as scanning deviation, camera shooting angle)
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