CN101501734B - Method and apparatus for raised material detection - Google Patents
Method and apparatus for raised material detection Download PDFInfo
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- CN101501734B CN101501734B CN2007800300004A CN200780030000A CN101501734B CN 101501734 B CN101501734 B CN 101501734B CN 2007800300004 A CN2007800300004 A CN 2007800300004A CN 200780030000 A CN200780030000 A CN 200780030000A CN 101501734 B CN101501734 B CN 101501734B
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- 239000000463 material Substances 0.000 title claims abstract description 99
- 238000000034 method Methods 0.000 title claims abstract description 59
- 238000001514 detection method Methods 0.000 title claims description 17
- 230000005855 radiation Effects 0.000 claims abstract description 110
- 238000003384 imaging method Methods 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 5
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- 230000006698 induction Effects 0.000 claims description 2
- 230000000630 rising effect Effects 0.000 claims description 2
- 239000002390 adhesive tape Substances 0.000 description 30
- 230000000694 effects Effects 0.000 description 12
- 238000005286 illumination Methods 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 3
- 230000012447 hatching Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000003760 hair shine Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
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- 238000006243 chemical reaction Methods 0.000 description 1
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- 230000001788 irregular Effects 0.000 description 1
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/16—Testing the dimensions
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
- G07D7/12—Visible light, infrared or ultraviolet radiation
Abstract
A method is provided of detecting a region of raised material on a document surface. A surface of the document is illuminated with at least one angled radiation beam such that any raised material on the document surface reflects the radiation. The surface containing the raised material is imaged using at least one radiation detector. The image is then processed to detect the existence on the document surface of the raised material. The illuminating step causes a reflection and/or shadow to be generated from at least one edge of the raised material. The processing step detects the location of the material using the said reflection and/or shadow from the at least one edge.
Description
Technical field
The present invention relates to detect the method for protruding material area on the document surfaces.The appropriate device that is used to carry out this method is also disclosed.
Background technology
In many different application, all provide the document that comprises the raised material zone.In general, this or deliberately add the material of document surfaces to, or as the result of certain behavior of third party.Usually expectation can detect this material, and this material is intentionally or by accident to be added to a part on the document or that form document.The very important a kind of application-specific of this process is in the document security field.
A kind of such raised material is to be applied to for example adhesive tape of the document of banknote.Expectation can detect the existence of this adhesive tape automatically, because this may indicate the infringement to document, thereby document (for example banknote) can be removed from circulation.Adhesive tape for example can also appear in the counterfeit money of " compound bill ".A kind of method of such detection adhesive tape provides in US4525630, wherein photodetector is measured the level from document areas direct reflection and irreflexive light, owing to comparing with banknote itself different reflecting attributes is arranged, therefore this adhesive tape that relatively makes can be detected.
But, need to improve detection to this raised material, be not only material type, also because more and more seasoned to the interested adulterator in document security rear portion (breech) and other people about detecting.Therefore, expectation improves the ability that detects raised material on the document.
Summary of the invention
According to a first aspect of the invention, we provide the method that detects protruding material area on the document surfaces, this method may further comprise the steps: with at least one angled radiation beam irradiation document surfaces, make any raised material on the document surfaces reflect this radiation, utilize at least one radiation detector imaging to comprise the surface of raised material, and handle image so that detect the existence of raised material on the document surfaces, wherein irradiating step makes and generates reflection and/or shade from least one edge of raised material, and wherein treatment step is used to from the described reflection at least one edge and/or the position of shadow Detection material.
We understand, the existence of raised material can be by use the radiation incided on the document surfaces and handle in very effective and accurately mode and successfully detect with detecting irradiated by this way file and picture and follow-up view data angledly.
Basically, handle the existence that image detects raised material, promptly occur.In general, not only can detect the existence of material, can also detect the position by suitable processing.
Although in general the present invention has found the specific use of the flexible document (for example sheet material) to relative thin, can be used for Doctype of the present invention and comprise the document of inflexibility basically, for example box or other container.Document surfaces preferably is the plane substantially, is (under the situation at flexible document) like this in irradiation and image-forming step at least, because this provides Polaroid big relatively document areas.In many cases, irradiation causes reflection from least one edge of material, and therefore treatment step in this case is preferably suitable for utilizing the position of being discerned from the reflection test material at least one edge.Shine all rightly, perhaps on the contrary, cause from the shade at least one edge to generate, in this case, treatment step can come the position of test material by the position of identification shade.More than the combination of these two kinds of methods be preferred.Therefore, raised material can be included in the material that document is added in the document manufacturing later on to.This raised material can comprise the material that is adhered to document surfaces by the third party except that document fabricator or constructor.
Generally speaking, when using wide-angle (therefore, near 90 °) between the normal on plane of definition document surfaces and the irradiation source, the present invention is the most effective, because this has realized raised material and the good contrast between the document surfaces on every side.Preferably, this angle is 70 ° or bigger, perhaps more preferably is 80 ° or bigger.
This method is also preferably utilized the radiation source execution that has collimation at least in the direction substantially parallel with the normal of document surfaces.Collimation on the plane substantially parallel with the plane of document surfaces also can provide improved raised material to detect.
Although can use the radiation source of single part, serve as effectively thus localized source or or even point source, be preferably provided in a plurality of radiation beams that one or more directions are extended.These can be provided by the radiation transmitter of the independent radiation source of a plurality of conducts or these radiation transmitters can serve as the general public extension source in one or more directions extensions together.Therefore, radiation beam can provide from the radiation source of placing along the line of the one or more sides of document surfaces basically.
Alternatively, radiation beam can provide from the radiation source of placing around document surfaces with distribution mode.But, in all cases, radiation source be arranged in parallel with document surfaces basically plane be preferred (and almost with its coplane, thereby wide-angle is provided).This guarantees that any one raised material border on the document surfaces may be used to discern the position of raised material.
For received radiation, can use the device of number of different types, these devices have by mechanical scanning or preferably obtain the ability of image by structure imaging equipment, and wherein the visual field of imaging device makes and can receive radiation from the different piece of raised material and document.Although each detecting device generally all is placed to from the low-angle path received radiation of normal definition about the plane of the specific part of inspection document surfaces, depend on specific layout, can use one or more detecting devices (imaging device).In general, this low-angle is about 10 ° of plane normal or littler.This angle provides the planimetric map of document effectively.Should also be noted that detecting device can perhaps additionally, be placed to the radiation of reception (minute surface or diffusion) radiation reflected or transmission alternatively, is their combination providing under the situation of a plurality of detecting devices perhaps.For the transmission-type detecting device, detecting device is placed into a side relative with raised material on the document, makes the detecting device radiation see through document before receiving.
In one arrangement, two radiation detectors can be provided, one of them is positioned to detect the light from the document surfaces direct reflection, and another detects from the irreflexive light of document surfaces, and these detecting devices produce together and can be used to carry out respective image of the present invention in the specific image disposal route.In addition, in some cases, further imaging is preferred to document under " light field " mode subsequently or side by side.In this case, provide radiation source along the document plane checked of definition normal or the irradiation beam is provided with becoming low-angle with it.Then, the light field image that is obtained uses in processing subsequently.
Be applicable to that multiple disposal route of the present invention comprises following basic step:
A) utilize the edge filter device that image is filtered;
B) the straight line candidate in the image of back is filtered in identification;
C) model of comparison candidate who is discerned and the raised material that will detect; And
D) relatively determine the position of material based on this.
Therefore, this edge filter is used for the model that movement images and representative are desirably in the physical features that interested raised material runs into.This model can comprise predefined template or " parent form ", this template or " parent form " comprise the clean or true document of representative (for example banknote) data, comprise the data of representing desired feature, wherein desired feature is for example wired, safety equipment or may otherwise be erroneously identified as other mark of not expecting raised material.
Under the situation of using direct reflection and diffuse reflection image, the step of handling image can comprise:
A) by relatively direct reflection and diffuse reflection image are discerned the candidate region;
B) utilize the edge filter device that direct reflection and/or diffuse reflection image are filtered;
C) the straight line candidate in the image of back is filtered in identification;
D) model of comparison candidate who is discerned and the raised material that will detect; And
E) relatively determine the position of material based on this.
Step (c) can comprise the candidate that eliminating occurs in the predefine template.
Be used in use under the situation of direct reflection and irreflexive detecting device, when comparing with material around, might there be different performances in the whole zone of raised material with the diffuse reflection response about its direct reflection.Therefore, the comparison between this image can show the position of the material of discussing, and comprises the border.
In either case, suppose suitable illuminate condition, one side raised material can be towards the bright reflection of providing of direction of illumination, one side at the provide shade of the back of the body towards direction of illumination.In this case, the candidate who is discerned can be divided into the negative candidate that positive candidate that representative increases about background intensity and representative reduce about background intensity.Therefore, model is suitable for seeking indication and for example exists this edge of tape right.This method also preferably includes one or more edges of identification document itself and the step of removing these edges from the candidate.
In general, this method also comprises analyzes the candidate, with the acquisition dimension information, and uses this dimension information in comparison step.Therefore, model can comprise the arrangement that is the right candidate of the parallel lines that separate.Depend on model, can discern one or more among straight line, irregular (wave) line or the curve candidate.Model can also be included in the arrangement that separates and/or have this line of predefine length range in the predefine interval.Model can also comprise line is arranged in for example shape of rectangle.Model can further include the consideration of the acutance (sharpness) of image center line.
It should also be understood that, the material of not all cardinal principle rat about document is all actual constitute detect in the raised material of type interested, this projection for example might comprise manufacturing defect, gauffer and other infringement on surface self because fault in material causes.In order to distinguish this defective and desired destination raised material, this model is preferably suitable for carrying out enough tests and analysis.
Raised material can be taked various ways, comprises band, safety equipment (for example hologram), projection printing (for example intaglio) and other incrustation.But in general, material is outstanding and the rising material type of land regions substantially is provided on the document surfaces of plane, and this zone is about the document surfaces projection, and platform is by circumferential edges (straight and/or crooked) definition.
Preferably, document is the valuable document such as security document, and this document comprises banknote, check, certificate and identification document (comprising passport).
Although in general preferably use ultraviolet, visible or infrared radiation or its combination in any, the present invention also is not limited to the type of the radiation of using.
According to a second aspect of the invention, we provide the device that is used to detect protruding material area on the document surfaces, this device comprises: at least one radiation source, be used for the surface of checking the position that is placed into corresponding angled radiation beam irradiation document, make and make all reflected radiations of any raised material on the document surfaces to generate reflection and/or shade from least one edge of raised material; At least one radiation detector is used to obtain the image of illuminated document surfaces; And processor, this processor is suitable for handling the image that receives from radiation detector, thus the existence by being used to discern raised material on the document surfaces from the described reflection and/or the shade identification material position at described at least one edge.
Therefore, this device is suitable for carrying out the method for first aspect present invention.Radiation source can be taked various ways, and this comprises lamp, laser, light emitting diode etc.At least in the direction on the plane that is parallel to document surfaces, can provide preferred collimation by the result of hole or the conduct particular device that uses (for example, having intrinsic collimation).Although laser can be used to carry out the present invention, but about other source, especially for the use of laser beam, might necessity cause relatively moving between source, document and the detecting device, under the situation that raised material exists, can be detected thereby utilize radiation beam scanned document surface and guarantee.
Still can additionally provide although relatively move, can use expansion or multiple source, thereby needs avoided to relatively moving.Under the situation in for example two sources, although in fact each in these sources can for example be positioned at the top on the surface that comprises raised material, one can be positioned on the document about checking the opposite side on plane.Also can provide a plurality of radiation sources, thereby definition is along the line of the one or more sides of document surfaces, though these also can constitute single common source to every line effectively.In order to provide along the collimation on the plane that defines by document surfaces, under the situation of (from one or more transmitters) extended source, a plurality of holes that length distribution along the line is provided are preferred, thereby limit the width that incides the beam of (during being parallel to the plane of document surfaces) on the document surfaces from each part in each source or source.
In other cases, may expect to provide the ring shooting of radiation source, these radiation sources can distribute about the normal of checking the position on the definition document surfaces.Although be not necessary, this provenance can provide equidistantly from normal, thereby is arranged in ring or circle.Preferably, provide full circle source, make radiation beam incide on the document from all angles around this full circle as multiple source or public expansion hula source.In general, in each case, a plurality of holes can be along the length distribution of this extended source, thus the beam angle in the restricted document plane.
But for all radiation sources, it is preferred that these radiation sources (although not coplane) in the plane substantially parallel with document surfaces are placed.Radiation source can add or be placed to alternatively radiation and the irreflexive radiation that generates direct reflection respectively.As previously described, preferably radiation is arranged so that generation is at least 70 ° of plane normal or bigger, preferably 80 ° or bigger beam angle.This provides " details in a play not acted out on stage, but told through dialogues " irradiation.Additional if desired " light field " irradiation, then radiation source can be positioned to along the normal that defines the document surfaces of checking or become a low-angle that radiation beam is provided with it (10 ° or littler).
At least one radiation detector also preferably is placed to from the path received radiation of definition about the low-angle (preferably 10 ° or littler) of plane normal.A plurality of radiation detectors can be provided, for example be used to receive minute surface and the diffusion detected radiation in ground.One or more radiation detectors also can be placed to and receive the radiation of transmission by document.These can replace the reflectivity radiation detector or additionally use.Simultaneously, various radiation sources can be used to generate ultraviolet, visible or infrared light, when being positioned at when checking the position, radiation detector is used to obtain the image of document surfaces, therefore this radiation detector each all preferably include camera, ccd array, line sweep equipment or other imaging device.
Under the situation of sheet material processing apparatus, check that the position generally comprises the part of document transport path, a plurality of documents are brought to thus path order and are used for the inspection position that raised material detects.The subsequent treatment of document generally depends on the result of testing process.
It is particularly preferred that this device is used in the banknote treating apparatus, and wherein the banknote treating apparatus comprises at least one input pod, at least one out-put container and is arranged to from least one input pod along transport path banknote is transported to the induction system of at least one out-put container.Device according to second aspect present invention can be placed to the transport path of continuing to use in detecting raised material existence on the banknote surface.
Description of drawings
With reference now to accompanying drawing, some examples of the method according to this invention and device are described, wherein:
Fig. 1 shows first example that is used to detection;
Fig. 2 shows second example that is used for from the band detection of both sides irradiation;
Fig. 3 a shows the how reflected radiation of surface of level and smooth light;
Fig. 3 b shows coarse surface and how to cause diffuse reflection;
Fig. 4 is the view from the point source illumination top;
Fig. 5 shows the extended source that elongates collimation;
Fig. 6 shows annular source and arranges;
Fig. 7 shows the example that utilizes photoconduction;
Fig. 8 shows the processing that is used for rim detection;
Fig. 9 shows the difference between gauffer and the band detection;
Figure 10 shows the edge treated that is used for gauffer and band;
Figure 11 is the image with side irradiation of explanation raised material observability;
Figure 12 is the image that shows big gauffer except that the aphotic zone;
Figure 13 shows another image with little gauffer and aphotic zone; And
Figure 14 is a transmission image.
Embodiment
We discuss now and are used for the method and apparatus that document (for example, banknote and voucher) is gone up the optical detection of raised material (for example, band, paper tinsel and or even intaglio).The key element of the method that is proposed is " details in a play not acted out on stage, but told through dialogues irradiation " and follow-up graphical analysis.
The details in a play not acted out on stage, but told through dialogues irradiation relates in the side irradiation about the sizable angle of document surfaces normal (generally being 70 ° or bigger).By comprising following effect, this make the raised material document three-dimensional structure as seen:
1. side irradiation: utilize one-sided irradiation, raised material seems bright towards the edge of irradiation, and the back of the body seems shade there be (secretly) towards the edge that shines;
2. distributed side irradiation: utilize distributed irradiation, all edges of raised material all will seem bright in image;
3. the measurement of surfaceness: raised material and the different surfaces feature (roughness) that does not cover document can produce the catoptrical different angles of institute and distribute, and produce the variation of Strength Changes or spatial-intensity statistics (texture) thus in viewed image.
Above method can be used in combination the one or more of these three kinds of effects.
Relate separately to the consideration at image intensity and edge based on the analysis of model, and the edge filter version, so that distinguish such as the interested target material of band and other structure such as gauffer.
Although transmission may be favourable in some applications, in most of the cases, expect that this method produces the optimum about catoptric imaging.In this case, irradiation and camera or sensor be not in the same side of document.
Some examples are more specifically described now.
Example 1: the edge labelling by one-sided source (bright with dark edge to)
Fig. 1 shows first example about related optical device physical operations principle.Attempt to detect when appending to the adhesive tape of document surfaces, document (being banknote in this example) by the CCD camera from top view.Alternatively, camera can be replaced by line sweep equipment (camera or contact-type image sensor), and banknote vertically carries with read line, makes that the line reader can be by different follow-up of line ground observation document.
With by ideally about the approximate 0 ° of irradiation document of surface normal and target to be to minimize traditional imaging of hatching effect opposite, the irradiation that being used for of being provided in the present invention, adhesive tape detected is arranged so that angle between irradiation and the document normal basically near 90 °, so that maximize the hatching effect that the three-dimensional structure by the substrate document causes.
In this configuration, adhesive tape presents rectangular configuration, make that the edge towards irradiation seems bright in image, and the back of the body seems secretly (shade is arranged) towards the edge that shines.Even for the adhesive tape of visible (tarnish) hardly, such irradiation also can clearly show adhesive tape structure.
Example 2: from the distributed irradiation (bright limb) of two or more sides
The optional layout of Fig. 1 has been shown in the example of Fig. 2, wherein in the both sides of analyzed area directional illumination has been arranged all with identical angle.Therefore, the edge of any side of object all will seem bright.This is favourable, because bright edge is easier usually detected.But, lost towards shining and carrying on the back towards the difference between the edge of irradiation.
Add more directional light sources around analyzed area with equal angular, irradiation will finally become a ring.
Example 3: the light reflection makes adhesive tape seem darker
No matter the selection (one-sided or distributed) of the above irradiation, a prior effect is observed in this details in a play not acted out on stage, but told through dialogues irradiation.
Depend on its surface structure, any material all has the specific light reflection distribution (seeing Fig. 3 a and 3b) at emission angle.Usually, reflection (" light " emission) will be concentrated to the equal angular of plane normal with incident light in level and smooth surface, can be at any direction reflected light (diffuse reflection) almost and coarse or labyrinth is surperficial.
Therefore, when when very much not being same as the angle object of observation of incident light, if object surfaces is coarse, then object seems brighter, and if object has level and smooth surface, then seem darker.Under the situation of desirable light reflection, object even seem to deceive fully.By utilizing the ratio of the measured intensity of the details in a play not acted out on stage, but told through dialogues irradiation intensity measured with utilizing the irradiation (light field) that is parallel to surface normal, this effect can be as the measurement to surfaceness.
Because paper sheet document has the surface of very fine structure (coarse) usually, therefore the object (especially adhesive tape) that appends on it will in most of the cases change the surface smoothness of respective regions, thereby cause a rectangle patch that seems darker than unlapped surface.
Utilize the ratio of intensity, the effect of surface color can be eliminated.The ratio chart picture of gained can be called " surfaceness image ".
If document identity is known (for example, specific banknote), then when operation, in fact do not need to measure the light field image, but can be stored in the model, be used for and measured darkfield image combination.
By further explanation, the various layouts of radiation source are described now.
Arrange 1: edge image (bright with dark edge to) with one-sided source
Fig. 4 shows an option that utilizes the irradiation in single-point source to arrange for first example.Fig. 4 can be regarded as the view of seeing along the camera of document plane normal basically from being positioned to.The adhesive tape that is positioned at as shown in the figure on the document surfaces can utilize this layout to be identified.
Arrange 2: edge image (bright with dark edge to) with elongation source
Alternatively, the array in directed source can be used as the source of elongating perpendicular to the direction of surface normal.This also can be used to realize first example.This layout is shown in Figure 5.In order to limit each source laterally produces the radiation beam angular distribution in the document plane degree, a plurality of holes are provided.
For " level " detection with " vertical " adhesive tape, is best about the rectangle document towards the layout irradiation of ground, angle at 45.But the diagonal angle adhesive tape will have the edge that is parallel to direction of illumination, for this edge, will show neither that shade does not show bright reflection (as shown in Figure 5) yet.
Here under the situation of described each example, radiation source is at the direction collimation that is parallel to plane normal---promptly, radiated wave can be regarded as in the direction that is parallel to the document plane normal and has component common.
Arrange 3: distributed irradiation (having only bright limb)
If it is bright that purpose is that all edges with raised material all are labeled as, then a kind of possible layout is shown in Fig. 6 is circular layout, and has all shone comparably to guarantee all edges.Irradiation can be perpendicular to the diffusion of surface normal, but must be once more along the directed or collimation (for point source) of direction (for Fig. 2) of surface normal.
Arrange 4: the distributed irradiation that produces bright limb is arranged
Read contact-type image sensor for line camera and line, it may be preferred using two thin irradiation bars (photoconduction or led array) in each side of sweep trace.This illustrates in Fig. 7.For keeping the details in a play not acted out on stage, but told through dialogues illumination characteristics, the point source in the surface normal direction " collimation " feature is important equally.
How we turn to detected image now.
Detect and handle
That the original camera from Fig. 4 after filtration of schematically having described Fig. 8 reads generation and be called the painted edge image in edge (seeing below) here.This is suitable for the layout about example 1.
In addition, the bottom shows the one dimension projection that is equivalent to the single file in the image of handling.
The method that is used for the adhesive tape detection according to this example mainly may further comprise the steps:
1. utilize the edge filter device that image is filtered.
2. carry out Hough conversion or any other method, come the straight line candidate in the detected image.
3. the edge is painted: with marginal classification for just (brightness strong local increase) with bear (the strong part of brightness reduces) candidate.This can realize by the second derivative of considering image.
4. the tabulation of the candidate edge in the selection image.This decision will consider not have the marginal texture (if knowing in advance) of the document of adhesive tape.
5. according to the adhesive tape model marginal texture in the image is analyzed.
The adhesive tape model that is used to detect refers to following one or more feature:
1) in most of the cases, adhesive tape shows that near rectangular configuration left and right sides is almost completely parallel (with respect to the beginning and the end of adhesive tape) at least.
2) parallel edge of adhesive tape structure is to just comprising (bright) edge and corresponding marginal edge (the band shade).
3) edge of adhesive tape must be in the scope between minimum and the breadth extreme.
4) adhesive tape is the approximate rectangular object with particular minimum length.
5) each edge of adhesive tape generally all is very sharp keen (corresponding to the peak value in the filtering image of specific breadth extreme).
The gauffer of adhesive tape on the document and document substrate all can produce edge (Fig. 9) in image, have the hatching effect of similar strength.
But following feature makes gauffer to exclude in handled image, not as the candidate:
I) gauffer has much smaller width, and therefore positive and negative edge will be very close;
Ii) in the edge image that is filtered, gauffer generally is the equivalent line of wide variety; And
Iii) gauffer generally has the structure not as the tape edge rule, promptly not exclusively is straight.
Figure 10 has schematically described the notion with the similar meaning of Fig. 8.
Except can not utilize in the analysis phase edge painted arrange the edge to, the detection under example 2 situations is worked in the mode that is similar to above example 1.All other aspects of model stand good.
Utilize the detection of surfaceness image to use according to example 3.Under the situation of protruding object with this surface characteristics, the deepening effect on details in a play not acted out on stage, but told through dialogues irradiation down level and smooth (light) the surface dark patch that will in the surfaceness image, draw, for example adhesive tape will be shown as approximate rectangular secret note.
Because adhesive tape might be transparent, so its document mode that prints below will be still as seen.For this reason, it is preferred using infrared radiation.Figure 11 shows how to utilize surfaceness imagery exploitation details in a play not acted out on stage, but told through dialogues irradiation to make " light " adhesive tape as seen.
More resemble corresponding technology based on the edge, corresponding detection algorithm will at first be discerned the candidate region of protruding object, then relatively these zones and model (for example, comprise to the requirement of parallel edge, width and length range etc.).
Similarly, avoid taking measures because the erroneous decision result that gauffer, printing defects, stain etc. cause.
The effect of above Figure 11 technology depends on the surfaceness of adhesive tape.Under the situation of the tape with rough surface, the more difficult detection in the position of tape is not because this tape produces in darkfield image that significant intensity reduces and might be when having other surface effect and lose during printing.But the change that tape generally can be added up (texture) by the local strength of observed image detects.Under the immovable situation of statistics, tape will be possible to use above-mentioned technology for detection based on the edge.Figure 12 shows the example that has " worst case " of big gauffer in the details in a play not acted out on stage, but told through dialogues irradiation.Be appreciated that the delustring of tape in this case means that this edge detects and may need.Utilization has the tape of delustring and still less the further example of gauffer is shown in Figure 13.
Figure 14 proof can use " transmission-type " to arrange that this figure especially shows edge effect (top center of image).
Claims (55)
1. method that detects protruding material area on the document surfaces comprises:
Utilize at least one angled radiation beam irradiation document surfaces, make that any raised material reflects this radiation on the document surfaces;
Utilize at least one radiation detector imaging to comprise the surface of this raised material; And
Handle this image, so that detect the existence of raised material on the document surfaces;
Wherein irradiation makes and produces reflection and/or shade from least one edge of raised material, and wherein treatment step is used to from the described reflection at least one edge and/or the position of shadow Detection raised material.
2. the method for claim 1, wherein document surfaces is the plane in irradiation and image-forming step at least substantially.
3. the method for claim 1, wherein raised material is included in and makes the material that document adds document later on to.
4. the method for claim 1, wherein raised material comprises the material that is adhered to document surfaces by the side except that the document wright.
5. the method for claim 1, wherein the surface is by the plane normal definition, and wherein each radiation beam all is orientated about this plane normal and becomes wide-angle.
6. method as claimed in claim 5, wherein each radiation beam is 80 degree or bigger about the angle of plane normal.
7. the method for claim 1, wherein each radiation beam is basic collimation in the direction substantially parallel with the document surfaces normal.
8. method as claimed in claim 7, wherein said at least one angled radiation beam comprises two or more angled radiation beams.
9. method as claimed in claim 8, wherein radiation beam is to provide from the radiation source of placing along the line of one or more sides of document surfaces basically.
10. method as claimed in claim 8, wherein radiation beam is to provide from the radiation source of placing that distributes around document surfaces.
11. method as claimed in claim 9, wherein radiation source is placed in basic parallel with document surfaces plane.
12. the method for claim 1, wherein document surfaces is defined by plane normal, and wherein each radiation detector is placed to along defining low-angle path received radiation about this plane normal.
13. method as claimed in claim 12, wherein this low-angle is 10 degree or littler.
14. the method for claim 1, wherein at least one radiation detector side relative with raised material on document makes the radiation transmission before receiving that is detected pass through document.
15. the method for claim 1 wherein provides radiation detector and is positioned to detect light from the document surfaces direct reflection, and the step of wherein handling image comprises the frame that has parallel lines in the searching image.
16. the method for claim 1 wherein provides two radiation detectors, one of them is positioned to detect the light from the document surfaces direct reflection, and another is positioned to detect from the irreflexive light of document surfaces.
17. method as claimed in claim 15 also comprises and utilizes direct reflection acquisition image and utilize diffuse reflection to obtain image.
18. the method for claim 1 also comprises simultaneously and/or subsequently along the normal on document plane or utilize radiation beam irradiation document with becoming low-angle with it, thereby the light field image of acquisition document.
19. method as claimed in claim 18, wherein the light field image uses in treatment step.
20. the method for claim 1, the step of wherein handling image also comprises:
Utilize the edge filter device that image is filtered;
Straight line candidate in the identification institute filtering image;
The model that compares candidate who is discerned and the raised material that will detect; And
Based on the described position of relatively determining raised material.
21. method as claimed in claim 20, wherein model comprises the data of representing clean or true document.
22. method as claimed in claim 20, the step of wherein handling image also comprises:
By relatively direct reflection and irreflexive image are discerned the candidate region;
Utilize the edge filter device to filter described direct reflection image and/or diffuse reflection image;
Straight line candidate in the identification institute filtering image;
The model that compares candidate who is discerned and the raised material that will detect; And
Based on the described position of relatively determining raised material.
23. method as claimed in claim 22, the straight line candidate in the wherein said identification institute filtering image also comprises and gets rid of the candidate who occurs in the predefine template.
24. method as claimed in claim 20 also is included in after the identification step, the candidate who is discerned is divided into representative has the positive candidate and the representative that increase intensity about background the negative candidate who reduces intensity to be arranged about background.
25. method as claimed in claim 24 also comprises the one or more edges of discerning document and the step of removing these edges from the candidate.
26. method as claimed in claim 20 also comprises and analyzes the straight line candidate, so that obtain dimension information, and uses this dimension information in comparison step.
27. method as claimed in claim 26, wherein model comprises the layout that is the right straight line candidate of the parallel lines that separate.
28. method as claimed in claim 26, wherein model is included in the layout of the line that separates within the predefine interval.
29. method as claimed in claim 26, wherein model comprises the layout that is positioned at the line within the predefine length range.
30. method as claimed in claim 26, wherein model comprises the layout of the line that forms rectangle.
31. method as claimed in claim 20, wherein model comprises the predefine acutance of line.
32. method as claimed in claim 20, wherein model also is suitable for distinguishing document surfaces defective and raised material.
33. method as claimed in claim 20, wherein this method is suitable for detecting the raised material that appends to document with one or more forms in band, safety equipment, the projection printing.
34. method as claimed in claim 20, raised material projection and the cardinal principle land regions of rising material is provided on the document surfaces of plane wherein, this zone is about the document surfaces projection and by one or more circumferential edges definition.
35. method as claimed in claim 20, wherein document is a security document.
36. method as claimed in claim 20, wherein radiation is ultraviolet, visible or infrared light.
37. a device that is used to detect protruding material area on the document surfaces comprises:
At least one radiation source is used for checking locational surface with being placed into of corresponding angled radiation beam irradiation document, makes all reflected radiations of any raised material on the document surface;
At least one radiation detector is used to obtain the image of irradiated document surfaces; And
Processor is suitable for handling the image that receives from described radiation detector, thus the existence of raised material on the identification document surfaces.
38. device as claimed in claim 37, wherein each radiation source all is arranged as the beam of basic collimation on the direction that is created on basic and document surfaces normal parallel.
39. device as claimed in claim 37, wherein radiation source is positioned at the offside of document.
40. device as claimed in claim 37, wherein a plurality of radiation sources are placed along the line of one or more sides of document surfaces basically.
41. device as claimed in claim 38, wherein a plurality of radiation sources constitute a public elongation source together, this elongation source has a plurality of holes along its length distribution.
42. device as claimed in claim 38 wherein provides a plurality of radiation sources around document.
43. device as claimed in claim 42, wherein a plurality of radiation sources constitute together one public around the source, should have a plurality of holes around the source along its length distribution.
44. device as claimed in claim 37, wherein radiation source is placed in basic parallel with document surfaces plane.
45. device as claimed in claim 37, wherein document surfaces is defined by plane normal, and wherein at least one radiation source is arranged to generate the radiation beam that defines wide-angle about this plane normal.
46. device as claimed in claim 45, wherein to be arranged to make radiation beam be 80 degree or bigger about the angle of plane normal to radiation source.
47. device as claimed in claim 37, wherein document surfaces is defined by plane normal, and wherein at least one radiation detector is placed to along defining low-angle path received radiation about plane normal.
48. device as claimed in claim 47, wherein this low-angle is 10 degree or littler.
49. device as claimed in claim 37, wherein radiation detector is placed to the radiation that receives direct reflection, and wherein second radiation detector is placed to the irreflexive radiation of reception.
50. device as claimed in claim 37, wherein at least one detecting device is placed into a side relative with raised material on the document, makes the radiation transmission before receiving that is detected pass through document.
51. device as claimed in claim 37 also comprises being used to be placed to by utilizing along the document plane normal or becoming low-angle radiation beam irradiation document to produce the radiation source of light field image with it.
52. device as claimed in claim 37, wherein each radiation source is ultraviolet, visible or infrared light supply.
53. device as claimed in claim 37, wherein radiation detector is selected from the group that comprises camera, ccd array or line sweep equipment.
54. device as claimed in claim 37 checks that wherein the position comprises the part of document transport path.
55. a banknote treating apparatus comprises: at least one input pod; At least one out-put container; Be arranged to banknote is transported to the induction system of out-put container from input pod along transport path; And the device that detects the existence of raised material on the banknote surface that is placed to along transport path as claimed in claim 37.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB0616495.8A GB0616495D0 (en) | 2006-08-18 | 2006-08-18 | Method and apparatus for raised material detection |
| GB0616495.8 | 2006-08-18 | ||
| US87838207P | 2007-01-04 | 2007-01-04 | |
| US60/878,382 | 2007-01-04 | ||
| PCT/GB2007/003116 WO2008020208A1 (en) | 2006-08-18 | 2007-08-16 | Method and apparatus for raised material detection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101501734A CN101501734A (en) | 2009-08-05 |
| CN101501734B true CN101501734B (en) | 2011-03-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007800300004A Active CN101501734B (en) | 2006-08-18 | 2007-08-16 | Method and apparatus for raised material detection |
Country Status (5)
| Country | Link |
|---|---|
| CN (1) | CN101501734B (en) |
| AT (1) | ATE483216T1 (en) |
| DE (1) | DE602007009547D1 (en) |
| GB (1) | GB0616495D0 (en) |
| RU (1) | RU2455690C2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8749767B2 (en) * | 2009-09-02 | 2014-06-10 | De La Rue North America Inc. | Systems and methods for detecting tape on a document |
| JP5989475B2 (en) * | 2012-09-19 | 2016-09-07 | 株式会社東芝 | Image reading apparatus and paper sheet processing apparatus |
| CN104802514B (en) | 2015-05-13 | 2017-12-22 | 广州广电运通金融电子股份有限公司 | A kind of flaky medium detection means of surface mount foreign matter |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1011079A1 (en) * | 1998-12-14 | 2000-06-21 | Kabushiki Kaisha Toshiba | Apparatus for determining the soil degree of printed matter |
| CN2594886Y (en) * | 2003-01-07 | 2003-12-24 | 天津南开戈德软件有限公司 | Detector for foreign article in passage of banknote identifier |
| CN1652987A (en) * | 2002-08-30 | 2005-08-10 | 富士通株式会社 | Method for detecting corner turndown of paper sheet and program for detecting corner of paper sheet |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2100477A1 (en) * | 1993-07-14 | 1995-01-15 | Andre Hiotis | Method and apparatus for detecting counterfeit documents |
| NL9401796A (en) * | 1994-10-28 | 1996-06-03 | Tno | Document recognition apparatus |
| CH693693A5 (en) * | 1997-06-06 | 2003-12-15 | Ovd Kinegram Ag | An apparatus for detecting optical diffraction markings. |
| US6106021A (en) * | 1998-02-02 | 2000-08-22 | Verify First Technologies, Inc. | Security papers with unique relief pattern |
| RU2270446C1 (en) * | 2004-10-07 | 2006-02-20 | Государственное учреждение Всероссийский центр глазной и пластической хирургии Министерства здравоохранения Российской Федерации | Method for investigation of histological specimen surface relief |
-
2006
- 2006-08-18 GB GBGB0616495.8A patent/GB0616495D0/en not_active Ceased
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2007
- 2007-08-16 CN CN2007800300004A patent/CN101501734B/en active Active
- 2007-08-16 RU RU2009109696/08A patent/RU2455690C2/en active
- 2007-08-16 DE DE602007009547T patent/DE602007009547D1/en active Active
- 2007-08-16 AT AT07789233T patent/ATE483216T1/en not_active IP Right Cessation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1011079A1 (en) * | 1998-12-14 | 2000-06-21 | Kabushiki Kaisha Toshiba | Apparatus for determining the soil degree of printed matter |
| CN1652987A (en) * | 2002-08-30 | 2005-08-10 | 富士通株式会社 | Method for detecting corner turndown of paper sheet and program for detecting corner of paper sheet |
| CN2594886Y (en) * | 2003-01-07 | 2003-12-24 | 天津南开戈德软件有限公司 | Detector for foreign article in passage of banknote identifier |
Non-Patent Citations (1)
| Title |
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| JP特开平8-292158A 1996.11.05 |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE483216T1 (en) | 2010-10-15 |
| RU2009109696A (en) | 2010-09-27 |
| DE602007009547D1 (en) | 2010-11-11 |
| GB0616495D0 (en) | 2006-09-27 |
| RU2455690C2 (en) | 2012-07-10 |
| CN101501734A (en) | 2009-08-05 |
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