CN108535255B - Document material evidence making time inspection method - Google Patents
Document material evidence making time inspection method Download PDFInfo
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- CN108535255B CN108535255B CN201810259359.9A CN201810259359A CN108535255B CN 108535255 B CN108535255 B CN 108535255B CN 201810259359 A CN201810259359 A CN 201810259359A CN 108535255 B CN108535255 B CN 108535255B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
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Abstract
A method for testing document evidence making time belongs to the technical field of document evidence testing and identification in criminal science technology, and particularly relates to a method for testing document evidence making time. The invention provides a test method for accurately judging the document material evidence making time. The invention comprises the following steps: 1) placing the material testing evidence on an object carrying platform flatly, and irradiating a tested area of the material testing evidence downwards by a light source; 2) acquiring a clear amplified image of the detected region of the material detection evidence through image acquisition equipment; 3) selecting sampling points on the strokes on the amplified image; 4) calculating the weighted average sensitivity of the sampling points under different illumination intensities of the light source, and 5) corresponding the weighted average sensitivity to the material inspection evidence making time.
Description
Technical Field
The invention belongs to the technical field of document evidence inspection and identification in criminal science technology, and particularly relates to a document evidence making time inspection method.
Background
In recent years, with the rapid development of society, cases which need to determine the document evidence making time are increasing in both civil cases and criminal cases. The number of cases concerning the inspection of the document creation time is rapidly increasing from the number of cases accepted by each national accreditation institution over the years. For the inspection of the document evidence making time, the problem of the making time of the document evidence in many civil cases and criminal cases cannot be solved due to the influence of factors such as numerous and complicated document evidence making materials and tools, different storage conditions of various document evidences and the like; the document evidence is often the key of case fixing, so that the case cannot be examined and judged in time, and the legal rights and interests of the parties are influenced.
Disclosure of Invention
The invention aims at the problems and provides a test method for accurately judging the document evidence making time.
In order to achieve the purpose, the invention adopts the following technical scheme, and the invention comprises the following steps:
1) placing the material testing evidence on an object carrying platform flatly, and irradiating a tested area of the material testing evidence downwards by a light source;
2) acquiring a clear amplified image of the detected region of the material detection evidence through image acquisition equipment;
3) selecting sampling points on the strokes on the amplified image;
4) calculating weighted average sensitivity of sampling points under different illumination intensities of a light source;
5) the weighted average sensitivity corresponds to the test material evidence preparation time.
As a preferable scheme, the illumination intensity of the invention is 80Lux, 100Lux, 150Lux and 200 Lux.
As another preferred scheme, the image acquisition device provided by the invention adopts a digital camera, the digital camera is vertically downward, and a clear amplified image of the detected region of the material detection evidence is acquired through automatic focusing and image acquisition.
As another preferable scheme, the light source of the invention vertically irradiates the detected area of the material detection evidence downwards.
As another preferred scheme, step 3) of the present invention adopts the following mode: and selecting a plurality of measured strokes on the enlarged image, and uniformly selecting a plurality of sampling points on each measured stroke.
As another preferred scheme, the sampling points are circular sampling points or rectangular sampling points, and the length and the width of each rectangular sampling point are both 100 micrometers.
As another preferred solution, the present invention selects 20 sampling points uniformly on each stroke to be measured.
As another preferred scheme, the tested pen stroke is a multi-turn, full, less white or no color material superposed pen stroke.
As another preferred embodiment, the weighted average sensitivity = (80 Lux MD) of the present invention1+100Lux*MD2+150Lux*MD3+200Lux*MD4）/4,MD1The average value of the average optical density of a plurality of sampling points under the light intensity of 80 LUX; MD2The average value of the average optical density of a plurality of sampling points under the light intensity of 100 LUX; MD3 is the average of the average optical density of multiple sample points under the light intensity of 150 LUX; MD4 is the average of the average optical density of a plurality of sample points at an optical intensity of 200 LUX.
Secondly, the average optical density = [ log10(255/H1) + log10(255/H2) + … + log10(255/Hn) ]/n, and Hn is the gray value of the nth pixel.
In addition, the higher the weighted average sensitivity, the earlier the material inspection evidence is made.
The invention has the beneficial effects.
Selecting sampling points on the strokes of a detected area, and calculating the weighted average sensitivity of the sampling points; the document evidence making time can be objectively and accurately judged.
The method calculates the weighted average sensitivity at different illumination intensities, can truly reflect the sensitivity change of the document evidence, and is suitable for the inspection of various different types of document evidences.
The weighted average sensitivity is calculated by the method, so that errors caused by inconsistent areas of sampling points can be avoided.
The invention fills the blank of the field of time inspection of large-span file formation, and improves the scientificity and objectivity of material evidence inspection and identification in the field of court science.
Drawings
The invention is further described with reference to the following figures and detailed description. The scope of the invention is not limited to the following expressions.
FIG. 1 is a schematic diagram of the calibration of a sampling point according to the present invention.
In the figure, 1 is a sampling point and 2 is a stroke.
Detailed Description
As shown in the figure, the present invention comprises the following steps:
1) placing the material testing evidence on an object carrying platform flatly, and irradiating a tested area of the material testing evidence downwards by a light source;
2) acquiring a clear amplified image of the detected region of the material detection evidence through image acquisition equipment;
3) selecting sampling points on the strokes on the amplified image;
4) calculating weighted average sensitivity of sampling points under different illumination intensities of a light source;
5) the weighted average sensitivity corresponds to the test material evidence preparation time.
The illumination intensity is 80Lux, 100Lux, 150Lux and 200 Lux; the error can be reduced to the maximum extent.
The image acquisition equipment adopts a digital camera, the digital camera is vertically downward, and a clear amplified image of the detected region of the material detection evidence is acquired through automatic focusing and image acquisition.
The invention can be accomplished using a device having the patent number 201620098049.X, entitled handwriting color trace and paper color sensitivity discriminator.
The light source vertically irradiates the detected area of the material detection evidence downwards.
The step 3) adopts the following mode: and selecting a plurality of measured strokes on the enlarged image, and uniformly selecting a plurality of sampling points on each measured stroke. Sampling points are selected by multiple parts, so that inspection errors can be effectively eliminated.
The sampling points are circular sampling points or rectangular sampling points, and the length and the width of each rectangular sampling point are both 100 micrometers.
And uniformly selecting 20 sampling points on each stroke to be measured.
The tested stroke is a stroke with multiple turns, full color marks, little white exposure or no color material superposition.
The weighted average sensitivity = (80 Lux MD)1+100Lux*MD2+150Lux*MD3+200Lux*MD4）/4,MD1The average value of the average optical density of a plurality of sampling points under the light intensity of 80 LUX; MD2The average value of the average optical density of a plurality of sampling points under the light intensity of 100 LUX; MD3 is the average of the average optical density of multiple sample points under the light intensity of 150 LUX; MD4 is the average of the average optical density of a plurality of sample points at an optical intensity of 200 LUX.
The average optical density = [ log10(255/H1) + log10(255/H2) + … + log10(255/Hn) ]/n, and Hn is the gray value of the nth pixel. Each sampling point is composed of a plurality of pixel points, and each sampling point has an average light density.
The higher the weighted average sensitivity, the earlier the material inspection evidence is made.
Example (b):
analysis result of writing trace color sensitivity data of certain brand blue-black ink pen
The embodiment shows that the weighted average value of the sensitivity of the handwriting trace of a certain brand of blue-black ink pen changes along with the evolution of time, the weighted average sensitivity is measured by the method, the change rule of the document material evidence sensitivity is examined, and the relative making time of the document can be effectively judged.
It should be understood that the detailed description of the present invention is only for illustrating the present invention and is not limited by the technical solutions described in the embodiments of the present invention, and those skilled in the art should understand that the present invention can be modified or substituted equally to achieve the same technical effects; as long as the use requirements are met, the method is within the protection scope of the invention.
Claims (8)
1. The document material evidence making time checking method is characterized by comprising the following steps of:
1) placing the material testing evidence on an object carrying platform flatly, and irradiating a tested area of the material testing evidence downwards by a light source;
2) acquiring a clear amplified image of the detected region of the material detection evidence through image acquisition equipment;
3) selecting sampling points on the strokes on the amplified image;
4) calculating weighted average sensitivity of sampling points under different illumination intensities of a light source;
5) the weighted average sensitivity corresponds to the material inspection evidence making time;
the weighted average sensitivity = (80 Lux × MD1+100Lux × MD2+150Lux × MD3+200Lux × MD 4)/4, and MD1 is an average value of the average optical density of a plurality of sampling points under the light intensity of 80 Lux; MD2 is the average of the average optical density of multiple sampling points under the light intensity of 100 LUX; MD3 is the average of the average optical density of multiple sample points under the light intensity of 150 LUX; MD4 is the average of the average optical density of multiple sampling points under the light intensity of 200 LUX;
the average optical density = [ log10(255/H1) + log10(255/H2) + … + log10(255/Hn) ]/n, and Hn is the gray value of the nth pixel.
2. The document proof-making time verification method according to claim 1, wherein said illumination intensity is 80Lux, 100Lux, 150Lux and 200 Lux.
3. The document material evidence making time checking method according to claim 1, wherein the image capturing device employs a digital camera, the digital camera is vertically downward, and a clear magnified image of the detected region of the material evidence is obtained by auto-focusing and image capturing.
4. The method for testing the document material evidence production time according to claim 1, wherein the light source irradiates the material evidence area to be tested vertically downward.
5. The document material evidence creation time verification method according to claim 1, wherein the step 3) adopts the following manner: and selecting a plurality of measured strokes on the enlarged image, and uniformly selecting a plurality of sampling points on each measured stroke.
6. The document material evidence production time checking method according to claim 1, wherein the sampling points are circular sampling points or rectangular sampling points, and the length and width of the rectangular sampling points are both 100 μm.
7. The document material evidence creation time verification method of claim 5, wherein said 20 sampling points are uniformly selected on each stroke being measured.
8. The method for testing document evidence creation time as claimed in claim 5, wherein said test stroke is a multi-turn, full, less white or no color superimposed stroke.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810259359.9A CN108535255B (en) | 2018-03-27 | 2018-03-27 | Document material evidence making time inspection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810259359.9A CN108535255B (en) | 2018-03-27 | 2018-03-27 | Document material evidence making time inspection method |
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| CN108535255A CN108535255A (en) | 2018-09-14 |
| CN108535255B true CN108535255B (en) | 2021-04-27 |
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Citations (6)
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| WO2007127876A2 (en) * | 2006-04-27 | 2007-11-08 | Qualcomm Incorporated | Weight adjustment in color correction |
| CN102539427A (en) * | 2012-01-23 | 2012-07-04 | 黑龙江大学 | Automatic detecting device for flour wet gluten and detecting method |
| CN204575528U (en) * | 2015-04-20 | 2015-08-19 | 芜湖市奥尔特光电科技有限公司 | A kind of document dating device |
| CN105403570A (en) * | 2015-12-29 | 2016-03-16 | 李绍辰 | Optical density parameter-based file finishing time identification method |
| CN205537962U (en) * | 2016-02-01 | 2016-08-31 | 中国刑事警察学院 | Writing look trace and paper color and luster sensitivity identifier |
| WO2016183921A1 (en) * | 2015-05-21 | 2016-11-24 | 浙江科技学院 | Pearl grading method |
-
2018
- 2018-03-27 CN CN201810259359.9A patent/CN108535255B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007127876A2 (en) * | 2006-04-27 | 2007-11-08 | Qualcomm Incorporated | Weight adjustment in color correction |
| CN102539427A (en) * | 2012-01-23 | 2012-07-04 | 黑龙江大学 | Automatic detecting device for flour wet gluten and detecting method |
| CN204575528U (en) * | 2015-04-20 | 2015-08-19 | 芜湖市奥尔特光电科技有限公司 | A kind of document dating device |
| WO2016183921A1 (en) * | 2015-05-21 | 2016-11-24 | 浙江科技学院 | Pearl grading method |
| CN105403570A (en) * | 2015-12-29 | 2016-03-16 | 李绍辰 | Optical density parameter-based file finishing time identification method |
| CN205537962U (en) * | 2016-02-01 | 2016-08-31 | 中国刑事警察学院 | Writing look trace and paper color and luster sensitivity identifier |
Non-Patent Citations (2)
| Title |
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| 字迹色痕与纸张色泽感光度鉴别仪的研究;于彬 等;《中国刑警学院学报》;20161231;第71-74页 * |
| 灰度法测定热敏文件的形成时间;何子瑛;《中国刑警学院学报》;20131231;第55-56页 * |
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