CN105044069A - Laser fluorescence inspection method for recognizing sequence of crossed writing and seal stamp - Google Patents
Laser fluorescence inspection method for recognizing sequence of crossed writing and seal stamp Download PDFInfo
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- CN105044069A CN105044069A CN201510493404.3A CN201510493404A CN105044069A CN 105044069 A CN105044069 A CN 105044069A CN 201510493404 A CN201510493404 A CN 201510493404A CN 105044069 A CN105044069 A CN 105044069A
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Abstract
The invention discloses a laser fluorescence inspection method for recognizing a sequence of a crossed writing and seal stamp. The specific implementation scheme is that blue laser is used as a light source and the laser is irradiated to a crossing position, which needs to be recognized, of a seal stamp and writing stokes. A cut-off long-wave-pass color filter with wave length longer than laser wave length is added at the front of a light sensor, and the light sensor transmits an image acquired through a microscope lens and the color filter to a computer through a data line for observation and photographing. By distinguishing the printing ink which emits fluorescence from the writing stokes which do not emit fluorescence through a method that the blue laser can excite printing ink fluorescence, the goal of recognizing the sequence of forming the seal stamp and the handwriting and typewriting is achieved, and the laser fluorescence inspection method has the characteristics of simplicity, feasibility and small equipment investment.
Description
Technical field
The present invention relates to a kind of laser fluorescence method of inspection for identifying red and black sequential, belonging to red and black chronicle recognition field.
Background technology
Red and black sequential, refers to the formation sequencing of seal impression (hereinafter referred to as Zhu) on file and word (hereinafter referred to as ink).At present in the inspection of document field of judicial expertise, microscope direct observing method is used usually to the inspection of red and black sequential, namely under 80-200 times of stereomicroscope, the color and luster of visual inspection printed text and writing stroke infall judges its formation order, but this kind of classic method is unreliable, very easily judge by accident, and image cannot be carried out to the phenomenon observed and fix.Also have a kind of common method of inspection to be stripping method, namely gently scrape with blade the color and luster that infall observes shaving lower floor colorant, but this kind of method not only destroys sample, in most of the cases not only invalidly also easily to judge by accident.
Inventor also retrieved the document utilizing laser Raman spectrometry to check red and black sequential, but laser Raman spectrometry is a kind of qualitative, quantivative approach of checking material, be applied in red and black sequence check aspect mainly by the material composition of laser Raman spectrometer inspection red and black crossover sites, and show with the form of spectrum curve, visual image can not be provided to differentiate, need the professional possessing relevant knowledge to differentiate, be unfavorable for applying of the method.
In recent years have the report utilizing fluorescence microscopy, but due to fluorescent microscope excitation source be the common xenon lamp or the LED light source that add color filter, monochromaticity deficiency causes bias light too strong and impact judges; The insufficient strength of light causes the fluorescence inspired not strong; Add that the sensitivity that is inadequate or photoreceptor of microscopical multiplying power is not enough, part stamp-pad ink can only be observed to impress heavier, the good red and black sequential of condition under darker observation condition, the red and black sequential slightly complicated to condition still cannot effectively be distinguished, even also can judge by accident, though so this kind of fluorescent microscope method of inspection exists already, only rest on conceptual phase and be not applied.
The differentiation of red and black sequential has been one of famous difficult problem in domestic judicial expertise field, but there is this type of a large amount of qualification requirements in judicial expertise practice, and professional testing staff's establishment is little, therefore, in the urgent need to a kind of simple and easy to do, be applicable to the red and black sequence check method that can implement of common judicial personnel.
Summary of the invention
For overcoming the deficiencies in the prior art part, the invention provides a kind of laser fluorescence method of inspection for identifying red and black sequential, to solve the various technical matterss that prior art exists.
The technical solution adopted in the present invention is:
For identifying a laser fluorescence method of inspection for red and black sequential, there are following steps:
1. use the blue diode laser that can send 445-473nm wavelength blue laser or pump laser as light source, by beam expanding lens or optical fiber beam expansion device, the laser that this light source sends is expanded, and suitably adjusting the spacing of described light source and sample paper, surface temperature when described sample paper is irradiated by blue laser remains on less than 70 DEG C;
2. an image magnification is selected to be 200-1000 videomicroscopy doubly, in front end or the rear end of the microlens of described videomicroscopy, install the cut-off type long-pass color filter that a wavelength is greater than described blue laser wavelengths additional, described photoreceptor connects computing machine by data line, thus the fluoroscopic image of acquisition is reached computing machine;
When 3. checking red and black sequential, seal and writing infall on sample paper is irradiated with described blue laser, and obtained the fluoroscopic image at this position by described long-pass color filter with described videomicroscopy, and by fluoroscopic image described in Computer display, then judge by the following method: when the red stamp-pad ink of a. intersects with laser printer or duplicating machine stroke: when infall finds stroke to occur stamp-pad ink fluorescence, then the chi sequence of this seal and writing is Zhu after first ink; When infall does not find stamp-pad ink fluorescence, then the chi sequence of this seal and writing is ink after first Zhu; B. when red stamp-pad ink intersects with ink-jet printer stroke, can observe from the back side of paper: as print oil bloom is thrust by stroke, be then Zhu after first ink; As complete in printed oil bloom, then ink after first Zhu; C. when red stamp-pad ink intersects with hand-written writing stroke, if stamp-pad ink fluorescence is less relative to the brightness decay of uncrossed place at infall, be then Zhu after first ink; More if decayed, be then ink after first Zhu; All there is fluorescence in groove mark depths as darker in writing stroke pen touch, then ink after first Zhu; More there is fluorescence in groove mark depths as darker in stroke pen touch, is then Zhu after first ink; D. when red stamp-pad ink intersects with duplication handwriting stroke, should observe from the back side of paper: if find that print oil bloom is thrust by stroke, be then Zhu after first ink; As complete in printed oil bloom, then ink after first Zhu.
Further, the luminous power of described blue laser is 2W-6W.
Further, described cut-off type long-pass color filter is one group of removable 585nm, 600nm, 610nm, 630nm long-pass cutoff filter.
Take into account visual field and multiplying power, preferably, the image magnification of described videomicroscopy is 400 times.
Further, described photoreceptor is CCD, CMOS camera or the digital single-lens reflex camera of light sensitivity ISO > 6400.
Inventive principle: under the laser excitation of 445-473nm wavelength, common writing colorant is as laser printer, ink-jet printer, various signature pen, ball pen, blue-black and ethereal blue pen, transfer paper etc., not luminous and aobvious black under 585-630nm long-pass color filter, stamp-pad ink is only had to have intense fluorescence, as long as therefore observe the stamp-pad ink fluorescence of stroke surface with or without shiny red of stroke and the not luminous and aobvious black of seal impression infall, can judge that both intersect to form order.
Beneficial effect: the inventive method is simple and easy to do, equipment investment is few, can identify without the need to professional knowledge, is a kind of red and black sequence check method being applicable to common judicial personnel and can implementing.
Accompanying drawing explanation
The invention will be further described in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is device location schematic diagram of the present invention.
Diagram: 1, LASER Light Source; 2, optical fiber beam expansion device; 3, sample; 4, microlens; 5, color filter group; 6, photoreceptor; 7, data line; 8, computing machine.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
In describing the invention, it will be appreciated that, term " longitudinal direction ", " transverse direction ", " on ", D score, "front", "rear", "left", "right", " vertically ", " level ", " top ", " end ", " interior ", the orientation of the instruction such as " outward " or position relationship be based on orientation shown in the drawings or position relationship, only the present invention for convenience of description, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.
Embodiment 1
1, laser equipment is selected
See Fig. 1, laser visible light beam color wavelength is from being short to long being followed successively by: bluish violet (405nm), blue (445nm, 460nm, 473nm), green (532nm), yellow (589nm) and red (635nm, 650nm).The fluorescence be inspired under the blue excitation light of 445nm-473nm wavelength is irradiated due to most stamp-pad ink is the strongest, and conventional write colorant unstressed configuration in this wave band, therefore select the blue diode laser of 445nm or 473nm wavelength or pump laser 1 as light source, and by beam expanding lens or optical fiber beam expansion device 2, laser beam is expanded, one of object is to expand viewing area, two is to reduce illumination temperature: under not damaging prerequisite to the paper of sample 3 or red and black colorant, temperature when general sample paper is illuminated must not more than 70 DEG C, to obtain maximum intensity of illumination.The luminous power of described blue laser usually at 2W-6W, by the distance controlling temperature of adjustment laser instrument 1 with sample 3.
2, videomicroscopy is selected
Select the videomicroscopy of suitable enlargement ratio, enlargement ratio is too small, does not see, excessive, does not observe the integral fluorescence form of stamp-pad ink.Generally between 200-1000 times, about 400 times more suitable.
3, the photoreceptor of ISO is selected
Though the fluorescence being excited out due to stamp-pad ink is strong, but because light after magnification at high multiple is diluted, normal CCD is difficult to photosensitive, should select CCD, CMOS camera or the digital single-lens reflex camera of top high photographic sensitivity ISO > 6400, have good imaging effect.
4, color filter
Experimentally result, most of stamp-pad ink is after by 445-473nm excitation, photoluminescence peak appears at 585-600nm, therefore select one group removable 585,600,610,630nm long-pass cutoff filter 5, be installed at microlens 4 front end or the rear end of videomicroscopy, stop 445-473nm wavelength laser, and receive color filter wavelength by regulating, be convenient to obtain best fluoroscopic image.
5, video acquisition
Photoreceptor 6 is connected on computing machine 8 by data line 7, the fluoroscopic image obtained by video acquisition software observes photoreceptor 6, and by the Image Saving chosen in a computer.
6, red and black sequential is identified
By the LASER Light Source of two kinds of wavelength 445nm and 473nm, be radiated on sample 3 simultaneously, to obtain best brightness and fluorescence excitation effect, and select suitable long-pass cutoff filter 5 to best fluorescent effect.Seal impression and writing stroke cover and are under laser irradiates, and in the video image collected by long-pass color filter 5, the stroke surface of black does not have the fluorescence of shiny red, then for writing after first affix one's seal (Zhu), typewrite (ink); The stroke surface of black is covered with the fluorescence of the shiny red of point-like or sheet, then for first writing, affix one's seal (Zhu) after typewrite (ink).
The inventive method is used to carry out generally carrying out judgement red and black sequential by the following method in the practice of red and black time-series rules:
1., red stamp-pad ink intersects with laser printer or duplicating machine stroke: the writing stroke of a, laser printer or duplicating machine is divided into dense form and sparse type.B, corresponding to dense form laser printing or duplicate writing stroke, observing print oil bloom upper in this equipment, then be first rear Zhu of ink.If observe on writing stroke and there is no fluorescence, then ink after first Zhu.C, corresponding to sparse type laser printing or duplicate writing stroke, select that ink powder is comparatively concentrated, ink powder covers the tight nothing region that shows money or valuables one carries unintentionally and observe, if observe print oil bloom upper, then be first rear Zhu of ink; If observe on this region ink powder and there is no fluorescence, then ink after first Zhu.
2., red stamp-pad ink intersects with ink-jet printer stroke: this is one the most difficult in red and black sequence check, because both colorants all have paper permeability, inspection is difficult to from recto, can observe from the back side of paper: if find that print oil bloom is thrust by stroke, be then Zhu after first ink; As complete in printed oil bloom, then ink after first Zhu.
3., red stamp-pad ink intersects with hand-written writing stroke: if a stamp-pad ink fluorescence is less relative to the brightness decay of uncrossed place at infall, such as, being less than 15%, is then Zhu after first ink; More if decayed, being such as greater than 25%, is then ink after first Zhu.If all there is fluorescence in the darker groove mark depths of b writing stroke pen touch, then ink after first Zhu; Groove mark depths as darker in stroke pen touch more occurs that fluorescence " shows money or valuables one carries unintentionally ", and namely stamp-pad ink is not deep into stroke groove mark depths, be then Zhu after first ink.
4., red stamp-pad ink intersects with duplication handwriting stroke: can observe from the back side of paper: if find that printing oil bloom is thrust by stroke, be then Zhu after first ink; As complete in printed oil bloom, then ink after first Zhu.
Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments without departing from the principles and spirit of the present invention, scope of the present invention is by claims and equivalents thereof.
Claims (5)
1., for identifying a laser fluorescence method of inspection for red and black sequential, it is characterized in that there are following steps:
1. use the blue diode laser that can send 445-473nm wavelength blue laser or pump laser as light source, by beam expanding lens or optical fiber beam expansion device, the laser that this light source sends is expanded, and suitably adjusting the spacing of described light source and sample paper, surface temperature when described sample paper is irradiated by blue laser remains on less than 70 DEG C;
2. an image magnification is selected to be 200-1000 videomicroscopy doubly, in front end or the rear end of the microlens of described videomicroscopy, install the cut-off type long-pass color filter that a wavelength is greater than described blue laser wavelengths additional, described photoreceptor connects computing machine by data line, thus the fluoroscopic image of acquisition is reached computing machine;
When 3. checking red and black sequential, seal and writing infall on sample paper is irradiated with described blue laser, and obtained the fluoroscopic image at this position by described long-pass color filter with described videomicroscopy, and by fluoroscopic image described in Computer display, then judge by the following method: when the red stamp-pad ink of a. intersects with laser printer or duplicating machine stroke: when infall finds stroke to occur stamp-pad ink fluorescence, then the chi sequence of this seal and writing is Zhu after first ink; When infall does not find stamp-pad ink fluorescence, then the chi sequence of this seal and writing is ink after first Zhu; B. when red stamp-pad ink intersects with ink-jet printer stroke, can observe from the back side of paper: as print oil bloom is thrust by stroke, be then Zhu after first ink; As complete in printed oil bloom, then ink after first Zhu; C. when red stamp-pad ink intersects with hand-written writing stroke, if stamp-pad ink fluorescence is less relative to the brightness decay of uncrossed place at infall, be then Zhu after first ink; More if decayed, be then ink after first Zhu; All there is fluorescence in groove mark depths as darker in writing stroke pen touch, then ink after first Zhu; More there is fluorescence in groove mark depths as darker in stroke pen touch, is then Zhu after first ink; D. when red stamp-pad ink intersects with duplication handwriting stroke, should observe from the back side of paper: if find that print oil bloom is thrust by stroke, be then Zhu after first ink; As complete in printed oil bloom, then ink after first Zhu.
2. a kind of laser fluorescence method of inspection for identifying red and black sequential according to claim 1, it is characterized in that, the luminous power of described blue laser is 2W-6W.
3. a kind of laser fluorescence method of inspection for identifying red and black sequential according to claim 1, it is characterized in that, described cut-off type long-pass color filter is one group of removable 585nm, 600nm, 610nm, 630nm long-pass cutoff filter.
4. a kind of laser fluorescence method of inspection for identifying red and black sequential according to claim 1, it is characterized in that, the image magnification of described videomicroscopy is 400 times.
5. a kind of laser fluorescence method of inspection for identifying red and black sequential according to claim 1, it is characterized in that, described photoreceptor is CCD, CMOS camera or the digital single-lens reflex camera of light sensitivity ISO > 6400.
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| CN107037030A (en) * | 2017-04-01 | 2017-08-11 | 王艳 | Printed text and the red and black sequential authentication method under writing not crossing instances |
| CN109187371A (en) * | 2018-09-04 | 2019-01-11 | 辽宁警察学院 | The method of red and black timing is judged based on YIQ color mode |
| CN110161669A (en) * | 2019-06-12 | 2019-08-23 | 中国科学院自动化研究所 | Based on analog video signal in body fluorescence microscopy lens head and fluorescence microscope |
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Cited By (9)
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| CN107025412A (en) * | 2016-01-29 | 2017-08-08 | 唐文凯 | It is a kind of to prevent the illegal mobile method using credit sign |
| CN107025412B (en) * | 2016-01-29 | 2020-04-17 | 唐文凯 | Method for preventing illegal mobile use of credit mark |
| CN106053122A (en) * | 2016-08-04 | 2016-10-26 | 无锡市帆鹰警用器材新技术有限公司 | Image-text print formation sequential identification sampling instrument |
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| CN106323849A (en) * | 2016-08-05 | 2017-01-11 | 天津大学 | Detection and evaluation method for measuring damage of illumination light sources to traditional painting colors |
| CN107037030A (en) * | 2017-04-01 | 2017-08-11 | 王艳 | Printed text and the red and black sequential authentication method under writing not crossing instances |
| CN109187371A (en) * | 2018-09-04 | 2019-01-11 | 辽宁警察学院 | The method of red and black timing is judged based on YIQ color mode |
| CN110161669A (en) * | 2019-06-12 | 2019-08-23 | 中国科学院自动化研究所 | Based on analog video signal in body fluorescence microscopy lens head and fluorescence microscope |
| CN112857243A (en) * | 2021-01-11 | 2021-05-28 | 南京航空航天大学 | Multi-scale digital image correlation measurement method |
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