CN101051350A - Scanning decomposing imaging detecting method for changing file - Google Patents
Scanning decomposing imaging detecting method for changing file Download PDFInfo
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Abstract
The present invention discloses a scanning decomposition imaging verification method of change-made file. Said method is characterized by that it mainly includes the following several steps: utilizing scanner as imaging device, making the file material evidence which is made of homochromo-isospectral color material and needs to be verified be once imaged, then utilizing computer image processing software to decompose said digital image so as to obtain the verification effect image for supporting true and false evaluation conclusion of said change-mode file.
Description
Technical field
The present invention relates to the examination of material evidence technology in a kind of forensic science field, the picture method of inspection is resolved in the scanning that relates to a kind of forged document specifically.
Background technology
A small amount of word or strokes such as the date on interpolation, the rewriting file, number, and then the original meaning of change file core content are one of main means of forged document in the present juridical practice.The fake producer selects to carry out interpolation with the similar colorant of original text writing color, proterties with vision usually, in general is difficult for accomplishing to make used colorant of interpolation and original text colorant composition in full accord.By the identical or close writing colorant of material evidences such as file tester evaluation instrumentation check apparent colour, relatively doubting is whether the adulterium writing is consistent with the spectral characteristic of original text, can disclose the fact that alters, and this is the routine inspection method of professional.This method equipment cost height, it is undesirable to exist image quality, and the part colorant can not effectively be distinguished, the less deficiency that waits of test range.
Summary of the invention
The technical problem to be solved in the present invention provides that a kind of inspection cost is low, imaging effect good, the picture method of inspection is resolved in scanning applied widely, forged document that test range is big.
Technical scheme of the present invention is such: the picture method of inspection is resolved in a kind of scanning of forged document, comprise the steps: that (1) is set to colour/reflection original text pattern with the falt bed scanner option, with the file to be detected of the resolution scan more than the 600dpi and import computer, be stored as jpeg format to obtain image file to be checked; (2) in image processing software, open image file to be checked, " image " on choice menus hurdle/" pattern ", test by following one or more methods:
(a) under 8/channel pattern of RGB color, click " image " → " adjustment " of menu bar, select " form and aspect/saturation degree ", at this moment eject form and aspect/saturation degree dialog box, saturation degree is transferred to+100, lightness is constant, slowly adjust form and aspect then and observe image file to be checked and change, until obtaining the difference effect that it resolves into picture, click " determining ", and image file is stored as the jpeg format file;
(b) " image " → " pattern " of click menu bar, select " CMYK color ", select again " 16/passage ", click " window " → " passage " of menu bar then, the right lower quadrant of workspace can eject dialog box, the state of display channel, click " eyes " icon in left side successively respectively, three kinds of shielding Cyan Magenta Yellow Black passage are observed the variation of image file by the single channel of remainder, to obtain checking information; If test effect is not good, click " image " → " adjustment " of menu bar again, select " form and aspect/saturation degree ", at this moment eject form and aspect/saturation degree dialog box, saturation degree is transferred to+100, lightness is constant, slowly adjusts form and aspect then and observe image file to be checked to change, until obtaining the difference effect that it resolves into picture; When obtaining desirable test effect, at the passage dialog box right button of clicking the mouse, click the Color Channel of deletion passage with the deletion conductively-closed, only stay the passage that obtains test effect, and with image file be stored as Photoshop (
*PSD) formatted file;
(c) " image " → " pattern " of click menu bar, select " Lab color ", select again " 16/passage ", click " window " → " passage " of menu bar then, the right lower quadrant of workspace can eject dialog box, the state of display channel, click " eyes " icon in left side successively respectively, shielding Lab, lightness, b passage or a passage can be observed the variation of image file by remaining a (Alpha1) or b (Alpha2) passage, obtain checking information; When obtaining desirable test effect, at the passage dialog box right button of clicking the mouse, click the Color Channel of deletion passage with the deletion conductively-closed, only stay the passage that obtains test effect, and with image file be stored as Photoshop (
*PSD) formatted file;
(d) " image " → " adjustment " of click menu bar selected " anti-phase ", and at this moment the writing stroke obtains better to distinguish effect under dark background, if the assay ideal can be clicked menu " file " → " being stored as ", file directly saved as jpeg format; If the result is not ideal enough, click " image " → " adjustment " of menu bar again, select " form and aspect/saturation degree ", at this moment eject form and aspect/saturation degree dialog box, saturation degree is transferred to+100, lightness is constant, slowly adjusts form and aspect then and observe image file to be checked to change, until obtaining the difference effect that it resolves into picture, then image file is stored as jpeg format.
The falt bed scanner that the scanning of above-mentioned a kind of forged document is resolved into described in the method for inspection is the wherein a kind of of BENQ SCANNER Q62, BENQ SCANNER 5250C etc., and image processing software is one of them of Adobe Photoshop CS2, Adobe Photoshop CS or Adobe Photoshop7.0.
The present invention compared with prior art has following advantage:
(1) equipment cost is cheap: the used BENQ SCANNER of scanning decomposition imaging method Q62 is the low-end product in the falt bed scanner, about 750 yuan of the market price; The used SYJ-8 type video fluorescence literary composition of tradition check trace instrument belongs to professional examination of material evidence instrument, about 220,000 yuan of price, and obviously the former equipment cost is more cheap.
(2) image quality is good: imaging definition can be subjected to the scanner quality influence, used BENQ SCANNER Q62 is the mid and low-end products of commercially available platform-type office in the scanner in the embodiment of the invention, but assay shows that its image quality still is better than file tester.
(3) imaging rich color: imaging method is decomposed in scanning not only can obtain black white image, many times also can obtain colored test effect image, more directly perceived; Although be used for the file tester system software chromatic colour pattern of comparison, be limited to the principle of work of its check forged document, most samples can only obtain test effect when selecting white-black pattern, so generally adopt the file tester method can only obtain black white image.
(4) the disposable test scope is bigger: for the paper size of sample, scanning is decomposed imaging method and is applicable on the A4 paper that any two places doubt to the disposable test of forged document and comparison (also can be greater than the A4 paper web as if special professional scanner), are applicable to most file material evidences; Though the tote box design of SYJ-8 type video fluorescence literary composition trace instrument commonly used has taken into full account the application of large-scale sample in the conventional art, but because file tester light path system design, cause the luminance difference at big more then centre of range of observation and edge big more inevitably, thereby can only gradation pursue partial test, be not easy to the comparison directly perceived under the equal test condition, even the about 800,000 yuan high-end file testers such as Britain VSC-5000 of price also are like this.
(5) recall rate is higher: 5 samples of doubting to altering of picked at random in the embodiments of the invention, compare check with method of the present invention and file tester respectively, for 5 case samples, imaging method is decomposed in scanning has 1 example not distinguish, the file tester method has 2 examples not distinguish, and illustrates that the recall rate of scanning decomposition imaging method is better than the file tester method.
The comprehensive premises, with method check forged document of the present invention, not only be better than file tester at image quality, an aspect such as test range, and recall rate is guaranteed, be a kind of new method of with low cost, convenient quick, effect forged document nondestructive test intuitively, the examination of material evidence technology in the forensic science field is significant.
Description of drawings
Below in conjunction with the embodiment in the accompanying drawing the present invention is described in further detail, but does not constitute any limitation of the invention.
Fig. 1 is a schematic flow sheet of the present invention;
Fig. 2 is the different blue signature pen writing test effect comparison diagram that method of the present invention (a) is done;
Fig. 3 is the different black signature pen writing test effect comparison diagrams that method of the present invention (b) is done;
Fig. 4 is the different blue ballpoint pen writing test effect comparison diagram that method of the present invention (c) is done;
Fig. 5 is the different black signature pen writing test effect comparison diagrams that method of the present invention (d) is done.
Embodiment
Consult shown in Figure 1, the picture method of inspection is resolved in the scanning of a kind of forged document of the present invention, comprise file material evidence scanning back input computer to be checked, and save as the document of jpeg format, open the image processing software of computer, test by the order of method (a) and (b), (c), (d) respectively, also can carry out different arrangement reorganization checks, detect effect or do not have the result up to drawing the best.
Know-why of the present invention is: falt bed scanner is made up of optical filtering (or reflective mirror), light source (or three-color light source), condenser lens, scan module, scanning element, scanning fluorescent tube etc. usually.Its document board is a sheet glass, original copy is motionless during scanning, scanning system moves horizontally by a gear train, the light of launching impinges upon on the original copy, after reflection or transmission, receive and generate simulating signal by receiving system, these electric signal are transformed into the digital signal of calculating function identification by analog-digital converter (A/D) again.
Scanner can write down colouring information, and as imaging device, the color of its record is the function of locus.The color space that provides among the Photoshop mainly contains RGB, CMYK, Lab, HSL etc.In general, all be to gather into earlier rgb color space to the sampling of original copy, this tests used scanner also is like this.The RGB correspondence be three kinds of primitive color lights of RGB, natural all colours can mix with these three kinds of light.RGB is had three independent Color Channels and a composite channel by the color space that Photoshop supports fully.CMYK is the color space consistent with four-color process technology, is made up of blue or green, pinkish red (fuchsin), Huang, black 4 Color Channels and a composite channel.Lab color space and device independent are quite wide colour gamuts that has contained all colours that human eye can see, are used for the conversion between RGB and CMYK in Photoshop.The HSL color space is divided into form and aspect (Hue), saturation degree (Saturation) and lightness (Lightness) with a kind of color, rather than is divided into the shades of colour component.Form and aspect are actual colors, and saturation degree is the density of these form and aspect, and lightness is the value that details are provided for image in the image.
Will describe color with numeral in the computing machine, the RGB image of scanner input is 24 color depths, and each image has three passages, each passage 8 bit depth, and three passages lump together and can generate nearly 16,700,000 kinds of colors.Change CMYK or 16 bit ports into, Photoshop can sample image again, and the number of colours of each passage is increased severely, and generates the better color details.And single color channel is just represented the relative intensity of this colour component in RGB or the CMYK image, and with the saturation degree adjustment, the color of the different constituents of colorant or the relative intensity of certain colour component just are easy to present difference.
Embodiment 1
Utilize the inventive method that tens kinds of difference handwritings are detected
(1) at first, be set to colour/reflection original text pattern, with the file to be detected of the resolution scan more than the 600dpi and import computer, be stored as jpeg format and obtain image file to be checked with BENQ SCANNER Q62 falt bed scanner option.
(2) secondly, open image file in Adobe Photoshop CS2 image processing software, " image " on choice menus hurdle/" pattern ", the pattern of visual picture are 8/passage of RGB color; Can test by following one or more methods, detect effect to obtain the best.
Method (a): image file to be checked is directly carried out the adjustment of form and aspect/saturation degree, the image file of scanner input all can be directly by carrying out the adjustment of form and aspect/saturation degree, thereby the imaging difference that colorant is write in demonstration; Concrete operations are: click " image " → " adjustment " of menu bar, select " form and aspect/saturation degree ", at this moment eject form and aspect/saturation degree dialog box, saturation degree is transferred to+100, lightness is constant, slowly adjust form and aspect then and observe image file variation to be checked, until obtaining the difference effect that it resolves into picture; Experiment shows, in most cases form and aspect adjust to+97 or to detect effect at-103 o'clock better; Consulting shown in Figure 2ly, is the six kinds of blue signature pen writing of difference test effect comparison diagrams that utilize method of the present invention (a) to be done.
In order to obtain the better pictures details, can also before beginning, method (a) concrete operations click " image " → " pattern " of menu bar, and " 8 bit port " reelected be " 16 bit port ".
Method (b): because it is comparatively complicated to write the colorant composition, the RGB color mode can be ignored the details of a lot of colors aspect inevitably, and 16/passage of CMYK color can obtain better treatment effect; Concrete operations are: click " image " → " pattern " of menu bar, select " CMYK color ", select " 16/passage " again, this just changes to image file to be checked " 16/passage of CMYK color "; Click " window " → " passage " of menu bar then, the right lower quadrant of workspace can eject dialog box, the state of display channel, click " eyes " icon in left side successively respectively, three kinds of shielding Cyan Magenta Yellow Black passage, single channel by remainder is observed the variation of image file, to obtain checking information.If test effect is not good, click " image " → " adjustment " of menu bar again, select " form and aspect/saturation degree ", at this moment eject form and aspect/saturation degree dialog box, saturation degree is transferred to+100, lightness is constant, slowly adjusts form and aspect then and observe image file to be checked to change, until obtaining the difference effect that it resolves into picture.When obtaining desirable test effect, at the passage dialog box right button of clicking the mouse, click the Color Channel of deletion passage with the deletion conductively-closed, only stay the passage that obtains test effect, and with image file be stored as Photoshop (
*PSD) formatted file.Consulting shown in Figure 3ly, is five kinds of different black signature pen writing test effect comparison diagrams that utilize method of the present invention (b) to be done.
Experiment showed, the file to be checked that most black or blue colorant are made, resolve into picture at the cyan passage, and saturation degree is adjusted into+100 change form and aspect again, can obtain usually and better detect effect.
Method (c): change the pattern of image file into Lab color 16/passage and detect, concrete operations are: " image " → " pattern " of clicking menu bar, select " Lab color ", select " 16/passage ", this just changes to image file to be checked " 16/passage of Lab color " again; Click " window " → " passage " of menu bar then, the right lower quadrant of workspace can eject dialog box, the state of display channel, click " eyes " icon in left side successively respectively, shielding Lab, lightness, b passage or a passage, can observe the variation of image file by remaining a (Alpha1) or b (Alpha2) passage, obtain checking information.When obtaining desirable test effect, at the passage dialog box right button of clicking the mouse, click the Color Channel of deletion passage with the deletion conductively-closed, only stay the passage that obtains test effect, and with image file be stored as Photoshop (
*PSD) formatted file.Consulting shown in Figure 4ly, is the five kinds of blue ballpoint pen writing test effect of difference comparison diagrams that utilize method of the present invention (c) to be done.
Method (d): image file directly is adjusted into anti-phase the detection, concrete operations are: click " image " → " adjustment " of menu bar, select " anti-phase ", at this moment the writing stroke obtains better to distinguish effect under dark background, if the assay ideal can be clicked menu " file " → " being stored as ", file is directly saved as jpeg format.If the result is not ideal enough, click " image " → " adjustment " of menu bar again, select " form and aspect/saturation degree ", at this moment eject form and aspect/saturation degree dialog box, saturation degree is transferred to+100, lightness is constant, slowly adjusts form and aspect then and observe image file to be checked to change, until obtaining the difference effect that it resolves into picture.Consulting shown in Figure 5ly, is five kinds of different black signature pen writing test effect comparison diagrams that utilize method of the present invention (d) to be done.
Embodiment 2
(1) method of the present invention is compared with the spectroscopic imaging inspection technology of traditional file tester, assay and partial test picture see Table 1.
Table 1 method of the present invention and file tester method part experiment sample assay and the tabulation of effect picture
As can be seen from the table, method of the present invention is better than the file tester method at aspects such as image quality, test effect color, disposable test scopes.
(2) 5 samples of doubting to altering of picked at random are tested with this method and file tester respectively, the results are shown in Table 2.
Table 2 method of the present invention and file tester method are applied to actual case check and the tabulation of effect picture
As can be seen from the table, for 5 case samples, imaging method is decomposed in scanning has 1 example not distinguish, and the file tester method has 2 examples not distinguish, and the recall rate that imaging method is decomposed in scanning is better than the file tester method.
Claims (2)
1. the picture method of inspection is resolved in the scanning of a forged document, it is characterized in that comprising the steps: that (1) is set to colour/reflection original text pattern with the falt bed scanner option, with the file to be detected of the resolution scan more than the 600dpi and import computer, be stored as jpeg format to obtain image file to be checked; (2) in image processing software, open image file to be checked, " image " on choice menus hurdle/" pattern ", test by following one or more methods:
(a) under 8/channel pattern of RGB color, click " image " → " adjustment " of menu bar, select " form and aspect/saturation degree ", at this moment eject form and aspect/saturation degree dialog box, saturation degree is transferred to+100, lightness is constant, slowly adjust form and aspect then and observe image file to be checked and change, until obtaining the difference effect that it resolves into picture, click " determining ", and image file is stored as the jpeg format file;
(b) " image " → " pattern " of click menu bar, select " CMYK color ", select again " 16/passage ", click " window " → " passage " of menu bar then, the right lower quadrant of workspace can eject dialog box, the state of display channel, click " eyes " icon in left side successively respectively, three kinds of shielding Cyan Magenta Yellow Black passage are observed the variation of image file by the single channel of remainder, to obtain checking information; If test effect is not good, click " image " → " adjustment " of menu bar again, select " form and aspect/saturation degree ", at this moment eject form and aspect/saturation degree dialog box, saturation degree is transferred to+100, lightness is constant, slowly adjusts form and aspect then and observe image file to be checked to change, until obtaining the difference effect that it resolves into picture; When obtaining desirable test effect, at the passage dialog box right button of clicking the mouse, click the Color Channel of deletion passage with the deletion conductively-closed, only stay the passage that obtains test effect, and image file is stored as Photoshop (* PSD) formatted file;
(c) " image " → " pattern " of click menu bar, select " Lab color ", select again " 16/passage ", click " window " → " passage " of menu bar then, the right lower quadrant of workspace can eject dialog box, the state of display channel, click " eyes " icon in left side successively respectively, shielding Lab, lightness, b passage or a passage can be observed the variation of image file by remaining a (Alpha1) or b (Alpha2) passage, obtain checking information; When obtaining desirable test effect, at the passage dialog box right button of clicking the mouse, click the Color Channel of deletion passage with the deletion conductively-closed, only stay the passage that obtains test effect, and image file is stored as Photoshop (* PSD) formatted file;
(d) " image " → " adjustment " of click menu bar selected " anti-phase ", and at this moment the writing stroke obtains better to distinguish effect under dark background, if the assay ideal can be clicked menu " file " → " being stored as ", file directly saved as jpeg format; If the result is not ideal enough, click " image " → " adjustment " of menu bar again, select " form and aspect/saturation degree ", at this moment eject form and aspect/saturation degree dialog box, saturation degree is transferred to+100, lightness is constant, slowly adjusts form and aspect then and observe image file to be checked to change, until obtaining the difference effect that it resolves into picture, then image file is stored as the jpeg format file.
2. the picture method of inspection is resolved in the scanning of a kind of forged document according to claim 1, it is characterized in that described falt bed scanner is the wherein a kind of of BENQ SCANNER Q62, BENQ SCANNER 5250C, image processing software is one of them of Adobe Photoshop CS2, Adobe Photoshop CS or AdobePhotoshop7.0.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100276971A CN100452083C (en) | 2007-04-25 | 2007-04-25 | Scanning decomposing imaging detecting method for changing file |
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| CNB2007100276971A CN100452083C (en) | 2007-04-25 | 2007-04-25 | Scanning decomposing imaging detecting method for changing file |
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| CN101051350A true CN101051350A (en) | 2007-10-10 |
| CN100452083C CN100452083C (en) | 2009-01-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108765085A (en) * | 2018-05-30 | 2018-11-06 | 杭州骑轻尘信息技术有限公司 | Vehicle order checking method, device and readable storage medium storing program for executing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5458418A (en) * | 1993-07-02 | 1995-10-17 | Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of Agriculture | Method for detecting poor meat quality in live animals |
| CN1470861A (en) * | 2002-07-22 | 2004-01-28 | 力捷电脑股份有限公司 | Lens detecting tool |
| CN100476406C (en) * | 2005-10-21 | 2009-04-08 | 中国科学院长春光学精密机械与物理研究所 | Continuouslly-scanning fluorescent imaging file tester |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108765085A (en) * | 2018-05-30 | 2018-11-06 | 杭州骑轻尘信息技术有限公司 | Vehicle order checking method, device and readable storage medium storing program for executing |
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