CN202018690U - Paper currency discrimination detector - Google Patents
Paper currency discrimination detector Download PDFInfo
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- CN202018690U CN202018690U CN201120062797XU CN201120062797U CN202018690U CN 202018690 U CN202018690 U CN 202018690U CN 201120062797X U CN201120062797X U CN 201120062797XU CN 201120062797 U CN201120062797 U CN 201120062797U CN 202018690 U CN202018690 U CN 202018690U
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- bank note
- total reflection
- reflection prism
- camera
- paper currency
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Abstract
The utility model discloses a paper currency discrimination detector, which comprises a total reflection prism. The total reflection prism and a light source are positioned on two sides of a paper currency conveying passage. When the paper currency conveying passage is used for conveying paper currency, the total reflection prism receives reflected light generated by projection of the light source on the paper currency, imaging of the paper currency is reflected to a camera, the camera is used for acquiring the image with at least one anti-counterfeiting characteristic on the paper currency and imaging of the at least one anti-counterfeiting characteristic in the total reflection prism. A judging module is used for discriminating and analyzing the paper currency, performing color discrimination and determining the paper currency true and false according to two characteristic patterns of one frame image. Compared with a plane mirror with continuous reducing light energy after a plurality of times of reflection and refraction, the total reflection prism can reflect the light energy out completely so that more ideal images are acquired in the same light condition.
Description
Technical field
The present invention relates to Flame Image Process and recognition technology field, be specifically related to a kind of bank note false distinguishing pick-up unit.
Background technology
A mode of the false distinguishing in financial machine and tool field just is based on the banknote false distinguishing of color.At traditional paper money counter, in the cleaning-sorting machine image detection facility for the detection of color characteristic usually based on the catoptric imaging mode of CMOS/CIS/CCD, collect coloured image after, the mode with Flame Image Process detects again, corresponding apparatus is also adopted in a large number.Have the false proof point of color changeable effect to have very strong anti-counterfeit capability in the anti-counterfeiting characteristic, promptly unique point is observed under different angles and is presented different colors; As light variable ink, antiforge laser holographic etc.Therefore a kind of traditional very natural mode is exactly to put CMOS/CIS/CCD or other adopt figure equipment in different angles, and the synchronous acquisition image carries out extraction and analysis to the color of image feature that collects in system then, reaches the effect of false distinguishing.Therefore need just can detect false proof point at causing each position that may occur of unique point that a plurality of image capture devices are installed because of bank note towards difference when bank note mixes point, hardware cost is higher relatively like this.
Existing banknote false distinguishing system design as shown in Figure 1, subject matter be bank note towards not simultaneously, the detection position difference of false distinguishing point, therefore the collecting device that must all lay in each detection position can be finished image acquisition, and judge module just can be further processed then.Therefore the problem that certainly exists for the detection of variable color feature is that hardware device quantity is many, system cost is high, hardware circuit drives complexity, mechanical realization is complicated, rigging up and debugging is complicated, model machine is difficult to problems such as commercialization.For example for the detection of light variable ink variable color, usually need two image capture devices be installed in positive and side, for just needing 8 collecting devices just can finish whole image acquisition process under the situation of mixing point, system just can finish follow-up identifying like this.In this case, the system architecture complexity, debugging difficulty is big etc., and problems must occur.
Number of patent application is 2007101663473, title " multi-angle optical characteristic automatic detection apparatus " is by introducing the mode of minute surface, changed the optical environment of surveyed area, the as many as direction that under the situation of translation-angle not, has changed light incident and reflection, thereby reached the purpose of observing two different angles optical signatures in same visual field, but general level crossing all is to form in that the rear surface of glass is silver-plated, because the reflecting effect of level crossing depends on the effect that producer is silver-plated, and silver-plated coming off easily brought inconsistency in the imaging; Referring to Fig. 2, level crossing light repeatedly is reflected into ghost image light path synoptic diagram, and wherein, S is an object, and S1 is the main picture of object, and S2/S3 is the image of other reflections.The front surface of level crossing is an also reflection ray of glass surface, and light will repeatedly reflect through glass surface and silver-colored face, so can become a plurality of pictures, forms image overlap, influences the processing of image judge module.Wherein the brightest by silver-colored face reflection imaging (main picture) for the first time, then darkness deepens for other picture, though generally can not arouse attention, but optical instrument for precision, in equipment such as camera, telescope, microscope, these unnecessary pictures must be removed, for more and more higher current of fraud level, the original reason error that the defective of optical system self causes also must removal just can reach the optimum of system, thereby lays good basis for the design of product and false distinguishing.
Summary of the invention
In view of this, the invention provides a kind of device that the bank note false distinguishing detects that is used for, comprise light source, camera, have the banknote feeding apparatus of a bank note transfer passage and have the master control circuit board of flip flop equipment, it is characterized in that, also comprise a total reflection prism, described total reflection prism and light source are positioned at the both sides of described bank note transfer passage; When described bank note transfer passage transmitted bank note, described total reflection prism received the reflected light that light source projects is produced to the described bank note, and the imaging of bank note is reflexed to described camera; The image of at least one anti-counterfeiting characteristic and the imaging of described at least one anti-counterfeiting characteristic in described total reflection prism on the described camera collection bank note.
There are certain angle in total reflection prism of the present invention bottom surface and reference plane, and the scope of described angle is spent between 80 degree 70.
As a kind of more excellent scheme, between described camera and paper money transmission channel, also comprise a beam-splitting board, this beam-splitting board carries out semi-transflective reflective to the light that light source sends.There are certain angle in described beam-splitting board and reference plane.Described angle be 40 spend to 50 the degree between.
Reference plane of the present invention is when flip flop equipment triggers described camera and begins to take, the plane at bank note place.
Anti-counterfeiting characteristic of the present invention is light variable ink feature and/or antiforge laser holographic feature.
Camera of the present invention is CMOS or CCD equipment, can finish the static state collection or the high speed acquisition of image.
Master control circuit board of the present invention also comprises judge module, and this judge module is used for the image information based on the color-changing anti-counterfeit characteristic pattern of described camera collection, judges the color-changing anti-counterfeit feature in the image information, to determine the true and false of described bank note.
Advantage of the present invention and effect:
1, adopt total reflection prism, eliminated the silver-plated quality problems in original level crossing rear surface, and the silver-plated problem that comes off easily.
2, with the continuous decling phase ratio of the repeatedly reflected refraction energy of level crossing, utilize as optical instruments such as total reflection prisms, luminous energy all reflects from prism and goes out, under identical illumination condition, with obtaining more desirable image frame, for subsequent treatment has been brought advantage.
3, add beam-splitting board between camera and bank note, this beam-splitting board carries out semi-transflective reflective to light, and camera can see through the beam-splitting board images acquired; Be equivalent to like this strengthen positive light intensity, the direct picture that camera is photographed is more clear, increases positive color effects, can further increase the aberration of direct picture and side image, makes judge module be more prone to differentiate the color-changing anti-counterfeit feature of bank note.
Figure of description
Fig. 1 is traditional banknote color false distinguishing system design structural representation;
Fig. 2 repeatedly is reflected into ghost image light path synoptic diagram for level crossing light;
Fig. 3 is the system schematic of the embodiment of the invention one;
Fig. 4 is a judge module workflow diagram of the present invention;
Fig. 5 is the system schematic of the embodiment of the invention two;
Fig. 6 is the system schematic of the embodiment of the invention three.
Embodiment
[embodiment one]
As shown in Figure 3, light source 31 is positioned at bank note transfer passage one side, the oblique upper of bank note 35; At the relative opposite side of bank note transfer passage and light source 31, a total reflection prism 33 is set, this total reflection prism 33 is near the position of bank note 35, makes the bank note 35 can imaging in total reflection prism 33.The bottom surface of described total reflection prism and the angle of reference plane are 70 degree.This reference plane is when flip flop equipment triggering camera 32 begins to take, the plane at bank note 35 places.
The light beam that light source 31 is launched impinges upon on the bank note 35, light beam is after launching on the bank note 35, described total reflection prism 33 receives the reflected light that light source projects are produced to the described bank note 35, because 45 ° of incident angles are injected 42 ° of the critical angles of air from glass greater than light, total reflection can take place in light on the prism bottom surface, become on 90 directions of spending during at last along incident to penetrate, and can not form ghost image.
The height of camera 32 and angle make and comprise bank note 35 and the picture of this bank note in total reflection prism 33 on the transfer passage in its field range simultaneously, when bank note 35 arrives the precalculated position by transfer passage, flip flop equipment triggers, camera 32 begins to take, and has comprised color-changing anti-counterfeit characteristic pattern on two bank note 35 in the two field picture; Afterwards, the judge module (not shown) is carried out a series of pre-service, feature extraction, analysis of threshold to the image that photographs, and comprehensively obtains final result.
The color-changing anti-counterfeit characteristic pattern that bank note has can be the pattern that adopts the light variable ink to generate, and with the viewing angle difference, the color of this feature can change; Can also be the antiforge laser holographic pattern, under the rayed of predetermined wavelength range, can present certain color.
Fig. 4 represents the judge module workflow diagram, after receiving the image that sends by camera, judge module is according to preassigned extraction point, extract the color-changing anti-counterfeit feature of bank note in the image, remove background color, determine the color value of two color-changing anti-counterfeit features of a two field picture, by the difference of contrast positive feature color value, side characteristic color value and positive side characteristic color value, carry out analysis of threshold, to determine whether all to meet the genuine note feature.If all meet the genuine note feature, promptly be judged to be genuine note; If incongruent feature is arranged, promptly be judged to be counterfeit money, shut down or the note distribution processing.
[embodiment two]
As shown in Figure 5, total reflection prism 53 and light source 51 are positioned at the both sides of bank note transfer passage, when described bank note transfer passage transmitted bank note, described total reflection prism 53 received light source 51 and projects the reflected light that is produced on the bank note 55, and the imaging of bank note is reflexed to described camera; This total reflection prism 53 is near the position of bank note 55, makes the bank note 55 can imaging in total reflection prism 53, and the angle of this total reflection prism bottom surface and reference plane is 75 to spend; Camera 52 is positioned at directly over the bank note transfer passage bank note 55, and the height of this camera 52 and angle make and comprise bank note 55 and the picture of this bank note in total reflection prism 53 on the transfer passage in its field range simultaneously.
Adopt such position relation, can make the color-changing anti-counterfeit feature that photographs reach best; With 100 yuan of face amount Renminbi is example, and positive light variable ink characteristic color is green, and the characteristic color of side is a purple, the analysis identification of convenient follow-up judge module.
The light beam that light source 51 is launched impinges upon on the bank note 55, light beam is after launching on the bank note 55, penetrate by opposite side, the light beam that reflects is penetrated on the bottom surface of total reflection prism 53, because 45 ° of incident angles are injected 42 ° of the critical angles of air from glass greater than light, total reflection can take place in light on the prism bottom surface, become on 90 directions of spending during at last along incident to penetrate, and can not form ghost image.
When bank note 55 arrives the precalculated position by transfer passage, flip flop equipment triggers, and camera 52 begins to take, and has comprised color-changing anti-counterfeit characteristic pattern on two bank note 55 in the two field picture; Afterwards, the judge module (not shown) is carried out a series of pre-service, feature extraction, analysis of threshold to the image that photographs, and comprehensively obtains final result.
[embodiment three]
As shown in Figure 6, present embodiment also comprises a beam-splitting board 66, and this beam-splitting board 66 is positioned under the camera 62, and is highly consistent with light source 61, this beam-splitting board 66 is higher than reference plane near light source 61 1 ends and becomes miter angle, and the light that 66 pairs of light sources 61 of this beam-splitting board send carries out semi-transflective reflective; Camera 62 can see through beam-splitting board 66 images acquired; Light beam by light source 61 ejaculations, after shining beam-splitting board 66, a part reflects, directive bank note 65, be equivalent to like this strengthen positive light intensity, the direct picture that camera 62 is photographed is more clear, increases positive color effects, can further increase the aberration of direct picture and side image, make judge module be more prone to differentiate the color-changing anti-counterfeit feature of bank note.
With the continuous decling phase ratio of the repeatedly reflected refraction energy of level crossing, all reflections and going out from prism of the luminous energy of utilizing total reflection prism under identical illumination condition, will obtain image frame more limpid in sight, for subsequent treatment has been brought advantage.
According to described 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 only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. one kind is used for the device that the bank note false distinguishing detects, and comprises light source, camera, has the banknote feeding apparatus of a bank note transfer passage and has the master control circuit board of flip flop equipment, it is characterized in that: also comprise a total reflection prism;
Described total reflection prism and light source are positioned at the both sides of described bank note transfer passage;
When described bank note transfer passage transmitted bank note, described total reflection prism received the reflected light that light source projects is produced to the described bank note, and the imaging of bank note is reflexed to described camera;
The image of at least one anti-counterfeiting characteristic and the imaging of described at least one anti-counterfeiting characteristic in described total reflection prism on the described camera collection bank note.
2. device as claimed in claim 1 is characterized in that there are certain angle in described total reflection prism bottom surface and reference plane, and the scope of described angle is spent between 80 degree 70.
3. device as claimed in claim 2 is characterized in that: described reference plane is when flip flop equipment triggers described camera and begins to take, the plane at bank note place.
4. device as claimed in claim 1 is characterized in that: described anti-counterfeiting characteristic is the color-changing anti-counterfeit feature.
5. device as claimed in claim 4 is characterized in that: described color-changing anti-counterfeit feature is light variable ink feature and/or antiforge laser holographic feature.
6. as each described device of claim 1 to 5, it is characterized in that: also comprise a beam-splitting board between described camera and paper money transmission channel, this beam-splitting board carries out semi-transflective reflective to the light that light source sends.
7. device as claimed in claim 6 is characterized in that: there are certain angle in described beam-splitting board and reference plane.
8. device as claimed in claim 7 is characterized in that: described angle be 40 spend to 50 the degree between.
9. as claim 1 to 5,7 or 8 each described devices, it is characterized in that: described camera is CMOS or CCD equipment, can finish the static state collection or the high speed acquisition of image.
10. as claim 1 to 5,7 or 8 each described devices, it is characterized in that: described master control circuit board also comprises judge module, this judge module is used for the image information based on the color-changing anti-counterfeit characteristic pattern of described camera collection, judge the color-changing anti-counterfeit feature in the image information, to determine the true and false of described bank note.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120062797XU CN202018690U (en) | 2011-03-10 | 2011-03-10 | Paper currency discrimination detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120062797XU CN202018690U (en) | 2011-03-10 | 2011-03-10 | Paper currency discrimination detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202018690U true CN202018690U (en) | 2011-10-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120062797XU Expired - Fee Related CN202018690U (en) | 2011-03-10 | 2011-03-10 | Paper currency discrimination detector |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102855684A (en) * | 2012-09-21 | 2013-01-02 | 苏州保瑟佳货币检测科技有限公司 | Optical detection method and device |
| CN102980660A (en) * | 2012-11-20 | 2013-03-20 | 北京华夏视科图像技术有限公司 | Optical system and off-line detection and analysis device with same |
| CN103985191A (en) * | 2014-05-29 | 2014-08-13 | 深圳速度技术有限公司 | Banknote counting machine with image recognition function |
| CN104331976A (en) * | 2014-10-31 | 2015-02-04 | 苏州保瑟佳货币检测科技有限公司 | Detecting method and device of negotiable securities |
| CN109916515A (en) * | 2019-03-29 | 2019-06-21 | 清华-伯克利深圳学院筹备办公室 | A kind of polarization detecting device |
-
2011
- 2011-03-10 CN CN201120062797XU patent/CN202018690U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102855684A (en) * | 2012-09-21 | 2013-01-02 | 苏州保瑟佳货币检测科技有限公司 | Optical detection method and device |
| CN102980660A (en) * | 2012-11-20 | 2013-03-20 | 北京华夏视科图像技术有限公司 | Optical system and off-line detection and analysis device with same |
| CN103985191A (en) * | 2014-05-29 | 2014-08-13 | 深圳速度技术有限公司 | Banknote counting machine with image recognition function |
| CN104331976A (en) * | 2014-10-31 | 2015-02-04 | 苏州保瑟佳货币检测科技有限公司 | Detecting method and device of negotiable securities |
| CN109916515A (en) * | 2019-03-29 | 2019-06-21 | 清华-伯克利深圳学院筹备办公室 | A kind of polarization detecting device |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CU01 | Correction of utility model patent |
Correction item: Second inventor Correct: Li Meng False: The inventor has waived the right to be mentioned Number: 43 Page: The title page Volume: 27 |
|
| CU03 | Correction of utility model patent gazette |
Correction item: Second inventor Correct: Li Meng False: The inventor has waived the right to be mentioned Number: 43 Volume: 27 |
|
| ERR | Gazette correction |
Free format text: CORRECT: THE SECOND INVENTOR; FROM: REQUEST TO WITHHOLD NAME TO: LI MENG |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111026 Termination date: 20140310 |