CN102339494A - Contact image sensor, multi-angle optical characteristic detection method and device - Google Patents
Contact image sensor, multi-angle optical characteristic detection method and device Download PDFInfo
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- 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
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Abstract
The invention discloses a multi-angle optical characteristic detection method, which comprises the following steps of: acquiring two images of a predetermined area on a detected object from predetermined angles theta1 and theta2 respectively; and comparing the two images to judge whether the predetermined area has multi-angle optical characteristics. The invention also provides a contact image sensor (CIS), a multi-angle optical characteristic detection device using the CIS and inspection equipment using the detection device. The CIS, the multi-angle optical characteristic detection method and the multi-angle optical characteristic detection device have the advantages of high detection and identification rate and stable and reliable performance.
Description
It is on November 02nd, 2010 that the application requires the applying date, and application number is 201010533349.3, and denomination of invention is the right of priority in first to file of a kind of multi-angle optical characteristic detection method and device, should all embody in this application at the full content of first to file.
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Technical field
The present invention relates to field of photoelectric technology, be specifically related to contact-type image sensor (CIS, Contact Image Sensor), multi-angle optical characteristic detection method and device.
Background technology
Multi-angle optical characteristic is meant when light and shines from different perspectives, or when observing observing object from different perspectives, observing object demonstrates the pictures different characteristic.The effect of the dynamic change that the image that the printing product of employing multi-angle optical characteristic fabrication techniques is seen has; Can't duplicate with high-definition scanning appearance, color copy machine and other equipment; Its design and production technology have professionally in addition, and complex manufacturing technology is invested huge; Therefore be difficult to copy, be widely used in the high-end false proof of bank note, important bill, trade mark.
The at present used technology with multi-angle optical characteristic is many, and wherein more common have interference of light color shifting ink, hologram image, a hidden pattern etc.
Interference of light color shifting ink (be called for short photochromatic printing ink, claim color shifting ink again, OVI, Optical Variable Ink) is a novel ink that come out, that the have dynamic color changeable effect nineties in 20th century.With the picture and text of its printing, can change irregularly from different viewed various colors.When observing about 0 degree, can demonstrate two kinds of distinct colors especially with observation about 60 degree.Since 99 editions 100 yuans were used this printing ink, this anti-fake mark so far not by imitated, became the vital signs of the true and false Renminbi of identification on counterfeit money.Also increasing photochromatic printing ink carries out false proof on other bills in addition.
Hologram image be through laser plate-making with making video to plastic sheeting, produce prismy diffracting effect, make picture have two dimension, three dimensions sense.Under ordinary ray, image, the information hidden in the picture can be reappeared, and when light when a certain special angle shines, on the picture again new image can appear.The multinational bank note, trade mark etc. that comprise Euro are at present all adopting the hologram image technology to carry out false proof.
Hidden pattern mainly is based on gravure techniques, and is different according to the direction of gravure ink strain line, and pattern refractive power effect is also different.When oblique view, produce the strong and weak different of reflection ray because of black line direction is different, the image of seeing can be observed hiding image information.And when right-angle view, reflective light intensity is weak irrelevant with black line orientation, and the hide information in the image can be stashed.Latent image has been widely used in multinational bank note at present, and the Renminbi that also is applied to various denominations is false proof.
Multi-angle optical characteristics such as color shifting ink OVI and hologram image are designed primarily to the false proof point on the human eye vision; Therefore utilize the false proof overwhelming majority of multi-angle optical characteristics such as color shifting ink or hologram image still to adopt human eye to accomplish at present; Human eye is observed from different perspectives, can present various colors.Also can adopt optical devices to detect the color that identification printing ink appears through under white light, obtaining different optical signatures from different perspectives.No matter be that the human eye translation-angle is observed or a plurality of video cameras are shot with video-corder character from different perspectives or color of image is differentiated, its essence all is the purpose that reaches the multi-angle optical characteristic collection through the variation of angle.
Conventional device all adopts based on cmos device (CMOS; Complementary Metal-Oxide Semiconductor) or charge coupled cell (CCD; Charge Coupled Device) camera is taken pictures to multi-angle optical characteristic (like color shifting ink or the hologram image etc.) zone of bank note; Obtain the image of relevant range, adopt image processing algorithm to differentiate the true and false of this false proof point afterwards.These devices have following principal feature:
The first, a cover image collecting device is installed in the position that possibly occur in each multi-angle optical characteristic zone.One covering device will be according to the position in taken multi-angle optical characteristic zone; The position of design light source and camera makes camera can obtain direct picture of bank note (from the image of approximate vertical angle shot) and side image (from the image of side with certain angle of inclination shooting) simultaneously.
The second, since the bank note of country variant, different Currency Types, and residing position on banknote, multi-angle optical characteristic zone has nothing in common with each other, and detects so a set of equipment often can only be applicable to the multi-angle optical characteristic zone of one or more Currency Types of a certain state bank note.
The 3rd, owing to adopt the camera focal length of CMOS or CCD all bigger, take the visual field of certain limit, all need certain shooting distance, so the required volume of whole filming apparatus is often all bigger.
Also determined the equipment that adopts CMOS or CCD camera to detect multi-angle optical characteristic can have following problem by above-mentioned characteristics:
At CMOS or CCD camera when taking; Bank note moves in walking the paper money chamber and the theory movement situation often has certain difference; This has also determined when camera carries out image taking; Residing position, multi-angle optical characteristic zone is equipped with certain discrepancy with theoretical bits, thereby also makes when imaging, the relative position of direct picture, side image, multi-angle optical characteristic zone and light source and be designed with certain deviation.This also finally has influence on the recognition effect of color shifting ink.
And; Because different Currency Type; The position of place, multi-angle optical characteristic zone banknote has nothing in common with each other; And CMOS or CCD device must be installed on the multi-angle optical characteristic regional location, so for the multi-angle optical characteristic zone bank note on same position not, can only discern through many different equipment.And when the bank note that issues a fresh edition,, then must carry out hardware design update again to original equipment if the position in multi-angle optical characteristic zone changes.
In addition, CMOS or CCD camera are volume required bigger, and for the very compact point of indoor design, test, sorting equipment, increased the Equipment Design requirement undoubtedly widely, also increased the overall volume of entire equipment.
Summary of the invention
In view of this; The present invention provides CIS, multi-angle optical characteristic detection method and device; The inspection machine that adopts multi-angle optical characteristic pick-up unit of the present invention also is provided; Gather the front and the side image of detected material simultaneously, and the image through relatively being gathered, reach the purpose that detects multi-angle optical characteristic with this.
A kind of multi-angle optical characteristic detection method provided by the invention, this method comprises:
Alternately shine the presumptive area on the detected material with the first incident angle θ 1 and the second incident angle θ 2; The said first incident angle θ 1 and the second incident angle θ 2 are unequal;
Receive the reflected light of said presumptive area with view angle φ, first image of said presumptive area when obtaining, and second image of said presumptive area during with the said presumptive area of the second incident angle θ, 2 irradiations with the said presumptive area of the first incident angle θ, 1 irradiation;
Whether more said first image and said second image have multi-angle optical characteristic to detect said presumptive area.
The present invention provides the detection method of another kind of multi-angle optical characteristic, and this method comprises:
Presumptive area on the irradiation detected material;
Receive the reflected light of said presumptive area with the first view angle φ 1 and the second view angle φ 2 respectively and obtain first image and second image of said presumptive area; The said first view angle φ 1 is unequal with the said second view angle φ 2;
More said first image and said second image detect said presumptive area and whether have multi-angle optical characteristic.
A kind of contact-type image sensor CIS provided by the invention, said CIS comprises: lens, opto-electronic conversion chip and first light source and the secondary light source alternately lighted;
Said first light source is with the presumptive area on the first incident angle θ, the 1 irradiation detected material;
Said secondary light source is with the presumptive area on the second incident angle θ, the 2 irradiation detected materials, and the said first incident angle θ 1 and the second incident angle θ 2 are unequal;
Said lens receive the reflected light of said presumptive area and import said opto-electronic conversion chip with view angle φ;
Said opto-electronic conversion chip receives the reflected light that imports through said lens, first image of said presumptive area when obtaining said first light source igniting, and second image of said secondary light source said presumptive area when lighting.
Another kind of contact-type image sensor CIS provided by the invention, said CIS comprises: light source, first lens, second lens, the first opto-electronic conversion chip and the second opto-electronic conversion chip;
Said light source, the presumptive area on the irradiation detected material;
Said first lens receive the reflected light of said presumptive area and import the said first opto-electronic conversion chip with the first view angle φ 1;
Said second lens receive the reflected light of said presumptive area and import the said second opto-electronic conversion chip with the second view angle φ 2; The said first view angle φ 1 is unequal with the said second view angle φ 2;
The said first opto-electronic conversion chip receives the reflected light that imports through said first lens, obtains first image of said presumptive area;
The said second opto-electronic conversion chip receives the reflected light that imports through said second lens, obtains second image of said presumptive area.
The present invention also provides a kind of multi-angle optical characteristic pick-up unit, comprises recognition unit and CIS provided by the invention.
Said CIS exports to recognition unit with first image that obtains and second image;
Said recognition unit is handled said first image and said second image, and more said first image and said second image, to judge whether presumptive area has multi-angle optical characteristic on the detected material.
The present invention also provides a kind of inspection machine, comprises multi-angle optical characteristic pick-up unit of the present invention, and indicating device;
Said multi-angle optical characteristic pick-up unit is used to detect the characteristic of presumptive area on the detected material, and testing result is sent to said indicating device;
Indicating device, whether the testing result that provides according to said multi-angle optical characteristic pick-up unit is exported seized detected material is genuine indicator signal.
Ground preferably, this inspection machine also comprises:
Alarm device is used to receive the testing result that said multi-angle optical characteristic pick-up unit provides, and according to said testing result outputting alarm sound signal.
In the detection method of CIS provided by the invention, multi-angle optical characteristic and the device; Gather detected material; The for example front of bank note or other printed articles and side image; Because incident angle and the catoptrical view angle of presumptive area of light are fixed, therefore the image light of collection is more even, compares method and device that in the past CMOS or CCD camera detect multi-angle optical characteristic; The detection method of multi-angle optical characteristic provided by the invention and device receive bank note in machinery is walked the paper money chamber, to walk the paper money situation to be influenced lessly, and the effect of obtaining multi-angle optical characteristic also can guarantee.Secondly, for different Currency Types, multi-angle optical characteristic (like color shifting ink, hologram pattern, hidden pattern etc.) even have nothing in common with each other in the position of banknote, also can be accomplished the detection of different Currency Type bank note through a set of equipment.When distribution new edition bank note, only need just can accomplish device upgrade through software upgrading.Relatively CMOS or CCD camera, the CIS volume is less, installs very convenient, carry out mechanical part can be when designing so that structure is more compact, device assembles is also convenient.For an equipment, as long as on the two sides of passage a CIS is installed respectively, the multi-angle optical characteristic that just can accomplish a piece of paper coin front and back full width face detects.It is high, stable and reliable for performance that multi-angle optical characteristic detection method provided by the invention and device detect discrimination.
Figure of description
Fig. 1 is the pick-up unit structural representation that provides in the prior art;
Fig. 2 is first kind of multi-angle optical characteristic detection method process flow diagram in the embodiment of the invention one;
Fig. 3 is second kind of multi-angle optical characteristic detection method process flow diagram in the embodiment of the invention one;
Fig. 4 is the multi-angle optical characteristic pick-up unit configuration diagram that provides in the embodiment of the invention two;
Fig. 5 is the another kind of multi-angle optical characteristic pick-up unit configuration diagram that provides in the embodiment of the invention three;
Fig. 6 is another the multi-angle optical characteristic pick-up unit configuration diagram that provides in the embodiment of the invention four;
Fig. 7 is the inspection machine configuration diagram that provides in the embodiment of the invention five.
Embodiment
Carry out the detection of multi-angle optical characteristic, make that this zone demonstrates different optical signatures on the image that photographs, will carry out the irradiation of different angles as much as possible to detected material, and carry out the shooting of different angles as much as possible.The present invention proposes and utilize CIS to gather the image of presumptive area different angles on the detected material, to reach the purpose that detects multi-angle optical characteristic.
Generally, CIS only is used to gather the image of perspective or positive reflection.The present invention provides a kind of detection method and device of multi-angle optical characteristic; Utilize CIS to gather detected material simultaneously; The for example front and the side image of the presumptive area on bank note or other printed articles; Whether extraction has multi-angle optical characteristic to this image multi-angle optical characteristic with the image of discerning presumptive area on the detected material.
Shown in Figure 1 is existing pick-up unit structural representation.As can be seen from Figure 1, this pick-up unit is realized by CIS, comprises among this CIS: visible light source 102, lens 103 and opto-electronic conversion chip 104.Particularly, with the presumptive area of incident angle θ irradiation detected material 101, the reflected light of presumptive area got into lens 103 with the direction perpendicular to detected material 101 planes when light source 102 was lighted, and finally through 104 imagings of opto-electronic conversion chip.It is the image that detected material is shone, takes and obtains that this catoptric imaging can be used as.
Carry out the detection of multi-angle optical characteristic, make on the image that photographs to demonstrate multi-angle optical characteristic, will carry out side-irradiation to detected material as much as possible, and carry out the side and take.Utilize CIS to carry out the collection of side image in the technical scheme provided by the invention, to reach the purpose of multi-angle optical characteristics such as detecting color shifting ink, hologram image and hidden pattern.
For making principle of the present invention, characteristic and advantage clearer, describe the present invention below in conjunction with specific embodiment.
Embodiment one
The detection method of two kinds of multi-angle optical characteristics is provided in the embodiment of the invention, can detects discriminating the multi-angle optical characteristic on bank note, bill or other printed articles.
With reference to Fig. 2, first kind of multi-angle optical characteristic detection method that the embodiment of the invention one provides comprises the steps:
S201 alternately shines the presumptive area on the detected material with the first incident angle θ 1 and the second incident angle θ 2; The said first incident angle θ 1 and the second incident angle θ 2 are unequal.
S202; Receive the reflected light of said presumptive area with view angle φ, first image of said presumptive area when obtaining, and second image of said presumptive area during with the said presumptive area of the second incident angle θ, 2 irradiations with the said presumptive area of the first incident angle θ, 1 irradiation.
The above-mentioned first incident angle θ 1, the second incident angle θ 2 and view angle φ are and angle perpendicular to the direction of detected material.
During for fear of the irradiation presumptive area, there is strong reflective appearance the corresponding position, thereby causes and can't normally form images, and the view angle φ and the first incident angle θ 1 and the second incident angle θ 2 are all unequal.
Presumptive area can present different multi-angle optical characteristics on the detected material in order to make, and can make the first incident angle θ 1 smaller or equal to 30 degree, and the second incident angle θ 2 is more than or equal to 60 degree.The difference that can also make the second incident angle θ 2 and the first incident angle θ 1 is more than or equal to certain numerical value, and particularly, this difference can be 10 degree, 30 degree or 50 degree etc.
S203, whether more said first image and second image have multi-angle optical characteristic to judge said presumptive area.
Multi-angle optical characteristic comprises the variable color characteristic of color shifting ink, the change in pattern characteristic of hologram image, the change in pattern characteristic of hidden pattern.
With reference to Fig. 3, second kind of multi-angle optical characteristic detection method that the embodiment of the invention one provides comprises the steps:
S301, the presumptive area on the irradiation detected material.
S302 receives the reflected light of said presumptive area with the first view angle φ 1 and the second view angle φ 2 respectively and obtains first image and second image of said presumptive area; The said first view angle φ 1 is unequal with the said second view angle φ 2.
When receiving the reflected light of presumptive area, with the first incident angle θ, 1 irradiation presumptive area, when receiving the reflected light of presumptive area, with the second incident angle θ, 2 irradiation presumptive areas with the second view angle φ 2 with the first view angle φ 1.
The above-mentioned first view angle φ 1, the second view angle φ 2, the first incident angle θ 1 and the second incident angle θ 2 are and angle perpendicular to the direction of detected material.
During for fear of the irradiation presumptive area, there is strong reflective appearance the corresponding position, thereby causes and can't normally form images, and the first view angle φ 1 and the first incident angle θ 1 are unequal, and the second view angle φ 2 and the second incident angle θ 2 are unequal.
Presumptive area can present different multi-angle optical characteristics on the detected material in order to make, and can make the first view angle φ 1 smaller or equal to 30 degree, and the second view angle φ 2 is more than or equal to 60 degree.The difference that can also make the second view angle φ 2 and the first view angle φ 1 is more than or equal to certain numerical value, and particularly, this difference can be 10 degree, 30 degree or 50 degree etc.
S303, more said first image and said second image detect said presumptive area and whether have multi-angle optical characteristic.
Multi-angle optical characteristic comprises the variable color characteristic of color shifting ink, the change in pattern characteristic of hologram image, the change in pattern characteristic of hidden pattern.
Embodiment two
The multi-angle optical characteristic pick-up unit structural representation of Fig. 4 for providing in the embodiment of the invention two.
As shown in Figure 4, said multi-angle optical characteristic pick-up unit comprises CIS and recognition unit (not shown among Fig. 4), and wherein CIS comprises the light source 302a that alternately lights, 302b, lens 303 and opto-electronic conversion chip 304.
In present embodiment two, the first incident angle θ 1 and the second incident angle θ 2 are unequal.
In order to make the presumptive area on the detected material 301 can present different multi-angle optical characteristics, can make the first incident angle θ 1 smaller or equal to 30 degree, the second incident angle θ 2 is more than or equal to 60 degree.The difference that can also make the second incident angle θ 2 and the first incident angle θ 1 is more than or equal to certain numerical value, and particularly, this numerical value can be 10 degree, 30 degree or 50 degree etc.
In present embodiment two, the reflected light of presumptive area is all with the direction incident lens 303 perpendicular to detected material 301 planes, and is so above-mentioned view angle φ equals 0 degree, not shown in Fig. 4.
During for fear of light source 302a and light source 302b irradiation presumptive area, the corresponding position has reflectively injects opto-electronic conversion chip 304 by force, thereby causes and can't normally form images, and the view angle φ and the first incident angle θ 1 and the second incident angle θ 2 are all unequal.
Opto-electronic conversion chip 304 receives the reflected light that imports through lens 303, first image of presumptive area when obtaining said light source 302a and lighting, and second image of light source 302b presumptive area when lighting.
Can also comprise the unit (not shown among Fig. 4) that control light source 302a and light source 302b alternately light among the CIS shown in Figure 4, such as, at first, light source 302a opens, and light source 302b closes, and opto-electronic conversion chip 304 is gathered delegation's view data; Afterwards, light source 302b lights, and light source 302a closes, and opto-electronic conversion chip 304 is gathered delegation's view data again; So alternately open light source 302a, 302b then, close light source 302b, 302a, by that analogy.This shows that when detected material 301 passed through opto-electronic conversion chip 304 fully, opto-electronic conversion chip 304 can obtain a coloured image, the odd-numbered line of this image obtains by light source 302a irradiation, and even number line obtains by light source 302b irradiation.Particularly, the image that can adopt the synthetic view picture of odd-numbered line of the image that the software image disposal route obtains opto-electronic conversion chip 304 to obtain by light source 302a irradiation fully, the image that the synthetic width of cloth of even number line is obtained by light source 302b irradiation entirely.Because the image that light source 302a irradiation obtains is to be obtained by front illuminated, the positive shooting; So can think the image that bank note or printed matter top view obtain, and light source 302b shines resulting image, though also be positive the shooting; But the incident angle of light source 302b is bigger; Can for example make the image of acquisition present different multi-angle optical characteristics, particularly so that present different multi-angle optical characteristics on the detected material equally; Demonstrate different colours (as far as color shifting ink) or different pattern (as far as hologram image and hidden pattern) on the image, be equal to the image that viewed detected material 301 obtains.Like this, for example,, in fact just utilize opto-electronic conversion chip 304 to obtain the image of two kinds of colors of color shifting ink simultaneously for color shifting ink.Afterwards; Through recognition unit (not shown among Fig. 4); Resulting direct picture and side image are carried out subsequent image processing; And more resulting direct picture and side image, whether having multi-angle optical characteristic to judge said zone, multi-angle optical characteristic comprises the variable color characteristic of color shifting ink, the change in pattern characteristic of hologram image and the change in pattern characteristic of hidden pattern.As judge whether printing ink is color shifting ink, and whether pattern is hologram image, and whether pattern is hidden pattern.Judge the true and false of bank note or printed matter according to multi-angle optical characteristic on two width of cloth images.
Embodiment three
The another kind of multi-angle optical characteristic pick-up unit structural representation of Fig. 5 for providing in the embodiment of the invention three.
The difference of multi-angle optical characteristic pick-up unit is among CIS shown in Figure 5 and the embodiment two; In the multi-angle optical characteristic pick-up unit that present embodiment three provides; Two light source 402a among the CIS and 402b are arranged on the same side of lens 403; Lens 403 receive the reflected light of presumptive area and import photoelectricity conversion chip 404 with view angle φ, and the view angle φ here is greater than 0 degree, and promptly lens 403 are provided with the plane that opto-electronic conversion chip 404 favours detected material 401.
Two light source 402a and 402b are installed in lens 403 homonymies, can allow lens 403 that certain angle of inclination is arranged like this, thereby make the light of light source 402b reflection of side-irradiation can be injected into opto-electronic conversion chip 404 more fully.So but the installation because lens 403 and opto-electronic conversion chip 404 will tilt is higher to manufacture process requirement.
This multi-angle optical characteristic pick-up unit workflow and the multi-angle optical characteristic pick-up unit among the embodiment two in the present embodiment are basic identical; Two light source 402a and 402b will alternately light; Can obtain corresponding image; Odd-numbered line in this image synthesizes first image that a width of cloth is obtained by light source 402a irradiation fully, and even number line synthesizes second image that a width of cloth is obtained by light source 402b irradiation fully.
Afterwards; Through recognition unit (not shown among Fig. 5); Resulting direct picture and side image are carried out subsequent image processing; And the multi-angle optical characteristic of more resulting direct picture and side image (like the color of color shifting ink, the pattern of hologram image or the image of hidden pattern), whether having multi-angle optical characteristic to judge said zone, multi-angle optical characteristic comprises the variable color characteristic of color shifting ink, the pattern of hologram image and the variation characteristic of hidden pattern.As judge whether printing ink is color shifting ink, and whether pattern is hologram image, and whether pattern is hidden pattern.Judge the true and false of bank note or printed matter according to multi-angle optical characteristic on two width of cloth images.
Embodiment four
Fig. 6 another multi-angle optical characteristic pick-up unit structural representation for providing in the embodiment of the invention four.With reference to Fig. 6, the multi-angle optical characteristic pick-up unit that provides in the present embodiment comprises CIS and recognition unit (not shown among Fig. 6), and wherein CIS comprises a light source 502, two groups of lens 503a and 503b, and two groups of opto- electronic conversion chip 504a and 504b.
The above-mentioned first view angle φ 1 and the second view angle φ 2 are unequal; And when lens 503a receives the reflected light of presumptive area with the first view angle φ 1; Light source 502 is with the first incident angle θ, 1 irradiation presumptive area; When lens 503b received the reflected light of presumptive area with the second view angle φ 2, light source 502 was with the second incident angle θ, 2 irradiation presumptive areas.
Can find out that in the present embodiment four, lens 503a and opto-electronic conversion chip 504a face detected material 501 and be provided with, 501 one-tenth certain angles of inclination of lens 503b and opto-electronic conversion chip 504b and detected material are provided with.
In present embodiment four, equal 0 degree on the first view angle φ, 1 border, so also not shown among Fig. 6.In order to make the presumptive area on the detected material 501 can present different multi-angle optical characteristics, the first view angle φ 1 can also select other values smaller or equal to 30 degree except that 0 degree, and the second view angle φ 2 is more than or equal to 60 degree.The difference that can also make the second view angle φ 2 and the first view angle φ 1 is more than or equal to a certain numerical value, and particularly, this numerical value can be 10 degree, 30 degree or 50 degree etc.
During for fear of light source 502 irradiation presumptive areas; There is strong reflective opto-electronic conversion chip 504a or the 504b of injecting the corresponding position; Thereby cause and can't normally form images, the first view angle φ 1 and the first incident angle θ 1 are unequal, and the second view angle φ 2 and the second incident angle θ 2 are unequal.
Opto-electronic conversion chip 504a receives the reflected light that imports through lens 503a, obtains first image of said presumptive area, i.e. direct picture.
Opto-electronic conversion chip 504b receives the reflected light that imports through lens 503b, obtains second image of said presumptive area, i.e. side image.
In the multi-angle optical characteristic pick-up unit that provides in the present embodiment,, therefore compare, in gatherer process, need not switch the light source of diverse location with aforementioned two kinds of devices owing to have only one group of light source.And two groups of opto- electronic conversion chip 504a and 504b; Can obtain a width of cloth complete image respectively; Obtain front illuminated, the positive direct picture of taking from opto-electronic conversion chip 504a, obtain the side image of side-irradiation, side shooting from opto-electronic conversion chip 504b.The image processing algorithm of this two width of cloth imagery exploitation rear end just can carry out the detection of multi-angle optical characteristic.Because there are not multiplexing situation in two groups of opto-electronic conversion chips, so angle can design comparatively rationally, and opto- electronic conversion chip 504a and 504b sensitization are also comparatively abundant.
Afterwards; Through recognition unit (not shown among Fig. 6); Resulting direct picture and side image are carried out subsequent image processing; And the multi-angle optical characteristic of more resulting direct picture and side image (like the color of color shifting ink, the pattern or the hidden pattern of hologram image), whether having multi-angle optical characteristic to judge said zone, multi-angle optical characteristic comprises the variable color characteristic of color shifting ink, the change in pattern characteristic of hologram image and the change in pattern characteristic of hidden pattern.As judge whether printing ink is color shifting ink, and whether pattern is hologram image, and whether pattern is hidden pattern.Judge the true and false of bank note or printed matter according to multi-angle optical characteristic on two width of cloth images.
Embodiment five
The embodiment of the invention also provides a kind of inspection machine; Adopt the multi-angle optical characteristic pick-up unit in the previous embodiment; Can be to adopting the detected material of multi-angle optical characteristics such as color shifting ink, hologram image, hidden pattern as false proof measure; For example bank note, bill or other printed articles detect, to declare the true and false of identification note, bill or other printed articles.
With reference to Fig. 7, the inspection machine 600 that the embodiment of the invention provides comprises the multi-angle optical characteristic pick-up unit 610 that provides in the previous embodiment two to four, and indicating device 620;
Multi-angle optical characteristic pick-up unit 610 is used to detect the presumptive area on the detected material, and testing result is sent to indicating device;
Indicating device 620, whether the testing result output detected material that provides according to multi-angle optical characteristic pick-up unit 610 is genuine indicator signal.
The inspection machine 600 that the embodiment of the invention provides also comprises:
In multi-angle optical characteristic detection method that the embodiment of the invention provides and the device; Adopt CIS to gather detected material; The for example front of bank note or other printed articles and side image; Because incident angle and the catoptrical view angle of presumptive area of light are fixed, therefore the image light of collection is more even, compares method and device that in the past CMOS or CCD camera detect multi-angle optical characteristic; The detection method of multi-angle optical characteristic provided by the invention and device receive bank note in machinery is walked the paper money chamber, to walk the paper money situation to be influenced lessly, and the effect of obtaining multi-angle optical characteristic also can guarantee.Secondly, for different Currency Types,, also can accomplish the detection of different Currency Type bank note through a set of equipment even color shifting ink or hologram image have nothing in common with each other in the position of banknote.When distribution new edition bank note, only need just can accomplish device upgrade through software upgrading.Relatively CMOS or CCD camera, the CIS volume is less, installs very convenient, carry out mechanical part can be when designing so that structure is more compact, device assembles is also convenient.For an equipment, as long as a CIS respectively is installed, just can accomplish the detection of multi-angle optical characteristics such as color shifting ink to a piece of paper coin front and back full width face, hologram image on the two sides of passage.
According to said disclosed embodiment, can be so that those skilled in the art can realize or use the present invention.To those skilled in the art, the various modifications of these embodiment are conspicuous, and the general principles of definition here also can be applied to other embodiment on the basis that does not depart from the scope of the present invention with purport.Above-described embodiment is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (32)
1. the detection method of a multi-angle optical characteristic is characterized in that, this method comprises:
Alternately shine the presumptive area on the detected material with the first incident angle θ 1 and the second incident angle θ 2; The said first incident angle θ 1 and the second incident angle θ 2 are unequal;
Receive the reflected light of said presumptive area with view angle φ, first image of said presumptive area when obtaining, and second image of said presumptive area during with the said presumptive area of the second incident angle θ, 2 irradiations with the said presumptive area of the first incident angle θ, 1 irradiation;
Whether more said first image and said second image have multi-angle optical characteristic to detect said presumptive area.
2. the method for claim 1 is characterized in that, when receiving the reflected light of said presumptive area with view angle φ, gathers delegation's view data of said presumptive area at every turn;
Synthetic said first image of gathering when utilization is shone said presumptive area with the first incident angle θ 1 of all images data, synthetic said second image of gathering when utilizing of all images data with the said presumptive area of the second incident angle θ, 2 irradiations.
3. the method for claim 1 is characterized in that, said view angle φ and the said first incident angle θ 1 are all unequal with the said second incident angle θ 2.
4. like each described method of claim 1 to 3, it is characterized in that the said first incident angle θ 1 is less than or equal to 30 degree, the said second incident angle θ 2 is more than or equal to 60 degree.
5. like each described method of claim 1 to 3, it is characterized in that the said first incident angle θ 1 spends more than or equal to 10 with the difference of the said second incident angle θ 2.
6. like each described method of claim 1 to 5, it is characterized in that the said first incident angle θ 1 spends more than or equal to 30 with the difference of the said second incident angle θ 2.
7. like each described method of claim 1 to 6, it is characterized in that the said first incident angle θ 1 spends more than or equal to 50 with the difference of the said second incident angle θ 2.
8. the detection method of a multi-angle optical characteristic is characterized in that, this method comprises:
Presumptive area on the irradiation detected material;
Receive the reflected light of said presumptive area with the first view angle φ 1 and the second view angle φ 2 respectively and obtain first image and second image of said presumptive area; The said first view angle φ 1 is unequal with the said second view angle φ 2;
Whether more said first image and said second image have multi-angle optical characteristic to detect said presumptive area.
9. method as claimed in claim 8 is characterized in that, when receiving the reflected light of said presumptive area with the first view angle φ 1, with the said presumptive area of the first incident angle θ, 1 irradiation;
When receiving the reflected light of said presumptive area, with the said presumptive area of the second incident angle θ, 2 irradiations with the second view angle φ 2.
10. method as claimed in claim 9 is characterized in that, the said first incident angle θ 1 is unequal with the said first view angle φ 1, and the said second incident angle θ 2 is unequal with the said second view angle φ 2.
11., it is characterized in that the said first view angle φ 1 is less than or equal to 30 degree like each described method of claim 8 to 10, the said second view angle φ 2 is more than or equal to 60 degree.
12., it is characterized in that the difference between the said first view angle φ 1 and the second view angle φ 2 is more than or equal to 10 degree like each described method of claim 8 to 10.
13., it is characterized in that the said first view angle φ 1 spends more than or equal to 30 with the difference of the said second view angle φ 2 like each described method of claim 8 to 12.
14., it is characterized in that the said first view angle φ 1 spends more than or equal to 50 with the difference of the said second view angle φ 2 like each described method of claim 8 to 13.
15. a contact-type image sensor CIS is characterized in that, said CIS comprises: lens, opto-electronic conversion chip and first light source and the secondary light source alternately lighted;
Said first light source is with the presumptive area on the first incident angle θ, the 1 irradiation detected material;
Said secondary light source is with the presumptive area on the second incident angle θ, the 2 irradiation detected materials, and the said first incident angle θ 1 and the second incident angle θ 2 are unequal;
Said lens receive the reflected light of said presumptive area and import said opto-electronic conversion chip with view angle φ;
Said opto-electronic conversion chip receives the reflected light that imports through said lens, first image of said presumptive area when obtaining said first light source igniting, and second image of said secondary light source said presumptive area when lighting.
16. CIS as claimed in claim 15 is characterized in that, said first light source and secondary light source are positioned at the both sides of said lens, and said view angle φ is 0 degree;
Perhaps, said first light source and secondary light source are positioned at the same side of said lens, and said view angle φ is greater than 0 degree.
17. CIS as claimed in claim 15; It is characterized in that; Said opto-electronic conversion chip is when receiving the reflected light that imports through said lens each time; Gather delegation's view data of said presumptive area, and synthetic said first image of all images data that collects when utilizing said first light source igniting, when utilizing said secondary light source to light with synthetic said second image of all images data that collect.
18. CIS as claimed in claim 15 is characterized in that, said view angle φ and the said first incident angle θ 1 and the second incident angle θ 2 are all unequal.
19., it is characterized in that the said first incident angle θ 1 is less than or equal to 30 degree like each described CIS of claim 15 to 18, the said second incident angle θ 2 is more than or equal to 60 degree.
20., it is characterized in that the said first incident angle θ 1 spends more than or equal to 10 with the difference of the said second incident angle θ 2 like each described CIS of claim 15 to 18.
21., it is characterized in that the said first incident angle θ 1 spends more than or equal to 30 with the difference of the said second incident angle θ 2 like each described CIS of claim 15 to 20.
22., it is characterized in that the said first incident angle θ 1 spends more than or equal to 50 with the difference of the said second incident angle θ 2 like each described CIS of claim 15 to 21.
23. a contact-type image sensor CIS is characterized in that, said CIS comprises: light source, first lens, second lens, the first opto-electronic conversion chip and the second opto-electronic conversion chip;
Said light source, the presumptive area on the irradiation detected material;
Said first lens receive the reflected light of said presumptive area and import the said first opto-electronic conversion chip with the first view angle φ 1;
Said second lens receive the reflected light of said presumptive area and import the said second opto-electronic conversion chip with the second view angle φ 2; The said first view angle φ 1 is unequal with the said second view angle φ 2;
The said first opto-electronic conversion chip receives the reflected light that imports through said first lens, obtains first image of said presumptive area;
The said second opto-electronic conversion chip receives the reflected light that imports through said second lens, obtains second image of said presumptive area.
24. CIS as claimed in claim 23 is characterized in that, when said first lens received the reflected light of said presumptive area with the first view angle φ 1, said light source was with the said presumptive area of the first incident angle θ, 1 irradiation; When said second lens received the reflected light of said presumptive area with the second view angle φ 2, said light source was with the said presumptive area of the second incident angle θ, 2 irradiations.
25. CIS as claimed in claim 24 is characterized in that, the said first view angle φ 1 is unequal with the said first incident angle θ 1, and the said second view angle φ 2 is unequal with the said second incident angle θ 2.
26., it is characterized in that the said first view angle φ 1 is less than or equal to 30 degree like each described CIS of claim 23 to 25, the said second view angle φ 2 is more than or equal to 60 degree.
27., it is characterized in that the difference between the said first view angle φ 1 and the second view angle φ 2 is more than or equal to 10 degree like each described CIS of claim 23 to 25.
28., it is characterized in that the said first view angle φ 1 spends more than or equal to 30 with the difference of the said second view angle φ 2 like each described CIS of claim 23 to 27.
29., it is characterized in that the said first view angle φ 1 spends more than or equal to 50 with the difference of the said second view angle φ 2 like each described CIS of claim 23 to 28.
30. a multi-angle optical characteristic pick-up unit is characterized in that, comprises that recognition unit reaches like each described contact-type image sensor CIS of claim 15 to 29;
Said CIS exports to recognition unit with first image that obtains and second image;
Said recognition unit is handled said first image and said second image, and more said first image and said second image, whether has multi-angle optical characteristic with the presumptive area that detects on the detected material.
31. an inspection machine is characterized in that, comprises the described multi-angle optical characteristic pick-up unit of claim 30, and indicating device;
Said multi-angle optical characteristic pick-up unit is used to detect the multi-angle optical characteristic of presumptive area on the detected material, and testing result is sent to said indicating device;
Indicating device, whether the testing result output detected material that provides according to said multi-angle optical characteristic pick-up unit is genuine indicator signal.
32. equipment as claimed in claim 31 is characterized in that, also comprises:
Alarm device is used to receive the testing result that said multi-angle optical characteristic pick-up unit provides, and according to said testing result outputting alarm sound signal.
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| CN2011103185345A CN102339494A (en) | 2010-11-02 | 2011-10-19 | Contact image sensor, multi-angle optical characteristic detection method and device |
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| CN2010105333493A CN101986353A (en) | 2010-11-02 | 2010-11-02 | Multi-angle optical characteristic detection method and device |
| CN201010533349.3 | 2010-11-02 | ||
| CN2011103185345A CN102339494A (en) | 2010-11-02 | 2011-10-19 | Contact image sensor, multi-angle optical characteristic detection method and device |
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| WO2012058954A1 (en) | 2012-05-10 |
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