CN102426643A - Wheel type laser encoding device and code reading method - Google Patents
Wheel type laser encoding device and code reading method Download PDFInfo
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- CN102426643A CN102426643A CN2011103896313A CN201110389631A CN102426643A CN 102426643 A CN102426643 A CN 102426643A CN 2011103896313 A CN2011103896313 A CN 2011103896313A CN 201110389631 A CN201110389631 A CN 201110389631A CN 102426643 A CN102426643 A CN 102426643A
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Abstract
The invention discloses a wheel type laser encoding device and a code reading method. According to the invention, a curved-plane bar code is a color block sequence different from laser reflectivity; the bar code reading device emits a laser beam by using a laser transmitting element; the laser beam is received by using a laser receiving element after being reflected by the curved plane of the bar code and converted into voltage by using a photoelectric conversion element; and in the process that the motor for driving the curved plane to rotate rotates for one circle, the encoding element can be used for receiving a voltage sequence formed by reflecting the laser beam by each color block sequence on the curved plane and reading the encoding information through calculation. The wheel type laser encoding device and the code reading method, disclosed by the invention, are applicable to the region with plane area insufficient for printing plane laser bar code; and the problem that the traditional bar code is intelligently printed on the plane and cannot be applied to the curved plane or rotating plane is effectively solved.
Description
Technical field
The present invention relates to laser encoding technology, be specifically related to wheeled laser code device and respective coding deciphering method.
Background technology
Along with the continuous development of laser encoding technology has brought huge change to your life, but because himself, its application in reality also exists some defectives to influence its practicality greatly.
The general printing of existing laser bar code is taken pictures or the laser entire scan is separated and read encoded radio through integral body in the plane.Can't print conventional laser bar code for those curved surfaces or Plane of rotation; Even if on curved surface or Plane of rotation, be printed with laser bar code; It can't be understood; Because the special construction of curved surface or Plane of rotation, corresponding reader can't form the whole photo of bar code or bar code is carried out entire scan, can't separate then and read encoded radio.
Summary of the invention
The present invention is directed to existing laser encoding technology and can't be applied to the problem on curved surface or the Plane of rotation, and a kind of wheeled laser code device and respective coding deciphering method are provided.The present invention can accurately realize the deciphering of bar code on curved surface or the Plane of rotation.
In order to achieve the above object, the present invention adopts following technical scheme:
Wheeled laser code device; This code device comprises the bar code that is arranged on the curved surface, drive the curved surface motor rotating and bar code is separated read apparatus; Said bar code is separated read apparatus and is comprised Laser emission element, laser pick-off element, photo-electric conversion element and encoding process element; Said curved surface bar code is the color lump sequence different to laser reflectivity, and said bar code is separated read apparatus and launched laser beam through the Laser emission element, through being received by the laser pick-off element behind the bar code camber reflection; Convert voltage into through photo-electric conversion element; When driving in the process that the curved surface motor rotating rotates a circle, the encoding process element can receive on the curved surface each color lump sequence the contact potential series that laser beam reflects to form is read coded message through computational solution.
Based on such scheme, the present invention provides a kind of wheeled laser code deciphering method, and this method comprises the steps:
(1) rotary setting has one week of swiveling wheel of bar code, and receives the reflected light that the bar code color lump is reflected;
(2) convert magnitude of voltage into according to the receiving light power degree, and voltage table is shown two kinds of level signals of height according to given threshold values;
(3) magnitude of voltage that in the monocycle rotary course, reception light is converted to is taken a sample, and converts monocycle receiving light power degree into the sampling voltage sequence through sampling;
(4) according to the density of encoding of design in advance, with one-period the sampling voltage sequence be divided into the encoding domain of corresponding number;
(5) the long interference value of removing corresponding proportion of the regional long and single encoding domain color lump of the low contrast ratio of color lump limit reflection that in each encoding domain, records according to experiment, high level occurrence number and low level occurrence number in the contact potential series that statistics is left;
(6), otherwise be designated as the low level territory if the high level occurrence number, remembers then that this encoding domain is the high level territory much larger than the low level occurrence number;
(7) at last with the high level territory as 1, the low level territory forms corresponding binary code sequence as 0.
Among the optimum embodiment of such scheme, said step (1) is carried out the swiveling wheel that rotary setting at the uniform velocity has bar code.
The sampling frequency of further, taking a sample in the said step (3) will be higher than the twice of the total periphery length of swiveling wheel divided by the length of the low contrast areas of color lump limit reflection.
The present invention who obtains according to such scheme can be coded in curved surface with laser bar code, accurately understands through surface of revolution.The present invention is applicable to that the area of plane is not enough to print the zone of planar laser bar code, effectively solves the printing of existing bar code intelligence in the plane, can't be applied to the problem on curved surface or the Plane of rotation.
Description of drawings
Further specify the present invention below in conjunction with accompanying drawing and embodiment.
Fig. 1 is the structural representation of wheeled laser code device among the present invention.
Fig. 2 is wheeled laser code device user mode synoptic diagram.
Fig. 3 for bar code single-revolution scanning mirror among the present invention as synoptic diagram.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect and be easy to understand and understand, below in conjunction with concrete diagram, further set forth the present invention.
Referring to Fig. 1, wheeled laser code device provided by the invention, this code device comprises the bar code 2 that is arranged on the curved surface, Laser emission element 3, laser pick-off element 4, photo-electric conversion element 5, encoding process element 6 and drive curved surface motor rotating 7.
Wherein driving curved surface motor rotating 7 links to each other through general IO bus line with encoding process element 6; Drive bar code 2 rotations that are arranged on the curved surface through rotating shaft; Laser emission element 3 is connected with encoding process element 6 through general IO bus line; Laser pick-off element 4 is through linking to each other with photo-electric conversion element 5 near non-contacting mechanical connection, and photo-electric conversion element 5 links to each other with encoding process element 6 through general IO bus line.
Referring to Fig. 2, the wheeled laser code device that such scheme forms in use, laser bar code 2 adopts black and white or other dichromatism vittas big to the light absorption difference, is printed on the swiveling wheel 8 outside surface curved surfaces.
Simultaneously, Laser emission element 3 is a launching fiber 11, aims at swiveling wheel 8 outside surface curved surfaces through emission mirror 13; Laser pick-off element 4 is one to receive optical fiber 12, aims at swiveling wheels 8 outside surface curved surfaces through receiving camera lens 14, and camera lens surface and outside surface Surface Method are to vertical, and both combine formation fibre-optical probe 1.
When needs are understood, through launching fiber 11 light is transmitted on the outside surface curved surface of swiveling wheel 2 through emission camera lens 13, at the uniform velocity drive 7 swiveling wheels 8 by motor then; Swiveling wheel 8 outside surface camber reflection light are received camera lens 14 receptions in the rotation process, and pass back through receiving optical fiber 12, in wheeled laser code device, form and receive light.
Because on the axle locating slot 81 is arranged in the swiveling wheel 8, so after rotating a circle, can obtain a complete monocycle scanning mirror picture (as shown in Figure 3).
Based on the wheeled laser code device that such scheme forms, its process of specifically understanding is following:
(1) rotary setting has one week of swiveling wheel of bar code, and swiveling wheel 8 outside surface camber reflection light are received camera lens 14 receptions in the rotation process, and passes back through receiving optical fiber 12, in wheeled laser code device, forms and receives light.
(2) when dichromatism vitta in the bar code is big to the light absorption difference; For example black vitta and white vitta are bigger to the absorptivity difference of white light; The intensity of reflected light difference when camera lens is faced black block and white blocks that promptly receives from reception optical fiber 12 is big; Can this intensity of reflected light (corresponding receiving light power degree) be converted into magnitude of voltage through photo-electric conversion element, a given threshold values can be shown two kinds of level signals of height with voltage table.
(3) the encoding process element to receiving the magnitude of voltage sampling that light converts to, can convert monocycle receiving light power degree into the sampling voltage sequence through sampling in this monocycle rotary course.
Because in the limit of a certain color lump, receive rotating speed to influence the interference that its intensity of reflected light can receive adjacent color lump intensity of reflected light, so sampling frequency must be higher than the twice of code wheel girth and color lump limit reflection disturbed area length of field ratio.This color lump limit reflection disturbed area length of field is code wheel external diameter, the two kinds of color lumps function to this kind frequency laser reflectivity ratio, density of encoding and motor speed, can measure via experiment.
(4) suppose that coding X can be expressed as the binary number that a units is N, then density of encoding is defined as N, one week of code wheel is divided into N encoding domain; Corresponding N color lump; For example be the expansion tiling figure of certain code wheel curved surface among Fig. 3, the density of encoding of expression is 16, represents one week of code wheel to be divided into 16 color lumps; The coding X that can represent 16 bits like this is from 0000H to FFFFH.
(5) in each encoding domain, reflect the width ratio on code wheel curved surface expansion direction that the disturbed area territory accounts for single color block areas then, remove the interference value of equal proportion according to the color lump limit.As shown in Figure 3, wherein frame of broken lines indicates zone 21 and receives its black block reflection interference zone, right side for white blocks 22, and this zone is because flare has part to drop in the adjacent color lump, so intensity of reflected light and this color lump regular reflection intensity differ bigger.For the two ends of each color lump on code wheel curved surface expansion direction; Such disturbed area territory is all arranged; For example frame of broken lines indicates zone 23 among Fig. 3; It is code wheel external diameter L, the two kinds of color lumps function to this kind frequency laser reflectivity ratio k, density of encoding N and motor speed v than λ and suitable SF S that this zone accounts for the width of single color lump on coding opinion curved surface expansion direction; Under the condition of given L, k, N and v, can record λ and SF S through experiment, experimental procedure (is surveyed the SF experiment) as follows:
1) at first rule of thumb estimate the λ value, suppose λ=1/50, represent that reflection disturbed area territory, single color lump two ends accounts for 1/50 of color lump overall width, sampling density just should equal 2 (N/ λ) like this, is 1600 in this example.
2) according to a week 1600 sampling frequency, use the code wheel of pure color, color is used the wherein a kind of of two kinds of coding color lumps; Such as white in this example, obtain the digital sample sequence after the opto-electronic conversion then, be made as V1; V2, V3 ... V1600; Get the median Vm of these 1600 data, calculate each data and compare the peak excursion amplitude of this median and ratio D=(Vn-Vm) max/Vm (n=1～1600) of median.
3) code wheel of replacing color lump alternate intervals is black such as in vain, white; Black ... as to be arranged in order, then according to 2) described in sampling rate one week 1600 samplings, respectively each coding region is extracted its 100 samplings, be made as Vs1; Vs2,, Vs3; ... Vs100, calculate median Vsm, then relatively each data therewith median compare ratio Dsn=(the Vsn-Vsm)/Vsm (n=1～100) of offset amplitude and median; If have only Ds1 and Ds100 greater than 2) in gained D, and Ds2, Ds3...Ds99 then repeat 3 less than D) step repeatedly; Reach more than 99.9% if meet above-mentioned requirements, then establish S=1600, Ds1 and Ds100 are also less than D else if; Then represent color lump two ends reflection disturbed area to account for color lump overall width＜50, then get back to 1) in the step, reduce λ; If in the middle of Ds2～Ds99 the value greater than D is arranged, then gets back to 1) step, increase λ; Repeat this experimental procedure up to obtaining SF S.
(6) after obtaining SF S, at definite color lump, under the condition of motor speed and laser frequency, intensity; The pure color code wheel that adopts＞1000 calculates intensity of reflected light and averages through the sampled value after the opto-electronic conversion according to all S frequency uniform sampling of sampling, and (intensity of reflected light is low to establish weak reflection color lump; In this example for black) intensity of reflected light is Vw1 through opto-electronic conversion post-sampling value, Vw2...VwS gets median Vwm; Strong reflection color lump (intensity of reflected light is high, is white in this example) intensity of reflected light is Vb1 through opto-electronic conversion post-sampling value, Vb2...VbS; The Vbm that averages establishes two kinds of color lumps to this source reflection rate ratio k=(Vbm-Vwm)/Vbm, and the two kinds of color lumps and the light source that require to select must satisfy k/2＞constant Q; Here Q must be much larger than (Vwn-Vwm) max/Vwm and much larger than (Vbn-Vbm) max/Vbm; (n=1～S), recommend Q=5% in this example can test for different application accuracy constant Q and to measure; But will be higher than this recommendation at least, the k value that＞1000 experiments of general are obtained is made even and all as two kinds of color lumps this source reflection rate is compared numerical constant.
(7) the reference threshold values Vstd of Vbm-Vwm+k*Vbm/2 as the sampled value high-low level, the coding opinion during with practical application adopts the intensity of light source in the above-mentioned experiment according to the color lump coding that above-mentioned experiment obtains; Frequency and motor speed use and obtain V1, the actual sample value of V2...VS S one week of frequency sampling; Then sampled value is equally divided into the N group according to density of encoding; If every group value is Vs1, Vs2...VsN at first respectively removes (S/N) * λ/2 interference values at the two ends of this class value.
(8) then remaining sampled value is compared with Vstd respectively, be designated as high level, be lower than Vstd and be designated as low level greater than Vstd.If the number of times that high level occurs is much larger than the low level occurrence number, as reach more than 10 times, remember that then this encoding domain is the high level territory, otherwise be designated as the low level territory.
(9) at last with the high level territory as 1, the low level territory promptly obtains binary code sequence as 0.
Based on such scheme, practical implementation of the present invention is following:
Referring to Fig. 2 and Fig. 3, two kinds of coding color lumps that adopt in this example are white and black, white rgb value (0x000000), and black rgb value (0xFFFFFF), code-wheel adopt quartzy total reflection material; Laser emission element 3 adopts 780nm, the laser tube of 10mW intensity and 0.9mm diameter silica fibre, and laser pick-off element 4 adopts 3mm diameter silica fibre, and photo-electric conversion element adopts the silicon light pipe, drives the curved surface motor rotating and adopts stepper motor; The encoding process element adopts ARM7, and wherein white is strong reflection color lump (high to this source reflection intensity), and black is weak reflection color lump (low to this source reflection intensity), and density of encoding N adopts 16, is the outwardly deploying figure of code-wheel like Fig. 3; Dividing 16 color lumps one week, from left to right is black successively, white, black, black; In vain, white, black, white, white; Black, white, white, black; Black, white, black, it should be 0100110110110010 that actual corresponding bar table is shown scale-of-two.
Experiment records monochromatic piece two ends reflections disturbed area territory and monochromatic piece length ratio λ on code-wheel outside surface girth expansion direction is 1/2 in this example; For example zone 21 and zone 23 are that the length that receives the zone 21 that the both sides black block disturbs is d1 in white blocks 21; The length in zone 23 is d3; The length of color lump 22 is d2, (d1+d3)/d2=1/2 then, and this value is to use above-mentioned survey SF experiment to record.
According to this λ, get SF S=2 (N/ λ), be 2* (16/ (1/2))=64 in this example.
According to (6) step in the principle; 1000 white pure color code wheels and 1000 black pure color code wheels are used in experiment, and it is 1600 that experiment records white blocks reflected light sampled value median Vbm, and black block reflected light sampled value median Vwm is 800; It is 1% that the white blocks sampled value departs from the median amplitude peak; It is 0.03% that the black block sampled value departs from the median amplitude peak, and it is 10% feasible that the Q value is got, and it is 50% that the k value is tried to achieve; K/2＞Q obviously, thus can be according to 1600-800+ (1600*50%/2)=1200 as sampling with reference to threshold values Vstd.
When code wheel shown in Figure 3 is understood; By ARM through clock controller output consistent pulse when recording above-mentioned constant experiment, swiveling wheel 8 uniform rotation among control step driven by motor Fig. 2, the while laser tube sends laser through optical fiber 11 from outgoing camera lens 13; After the code wheel surface reflection; Reflected light gets into optical fiber 12 through camera lens 14, converts magnitude of voltage into through the silicon light pipe, is sampled according to a week 64 SF use analog to digital converter by ARM.
Once the data of sampling are seen table 1 in the present embodiment:
Table 1
| Sequence number | Sampled value | Sequence number | Sampled value | Sequence number | Sampled value | Sequence number | Sampled value |
| 1 | 799 | 17 | 1533 | 33 | 1602 | 49 | 892 |
| 2 | 801 | 18 | 1600 | 34 | 1601 | 50 | 800 |
| 3 | 802 | 19 | 1602 | 35 | 1602 | 51 | 800 |
| 4 | 895 | 20 | 1600 | 36 | 1530 | 52 | 801 |
| 5 | 1570 | 8 | 1601 | 37 | 891 | 53 | 800 |
| 6 | 1601 | 22 | 1598 | 38 | 801 | 54 | 799 |
| 7 | 1600 | 23 | 1597 | 39 | 799 | 55 | 801 |
| 8 | 1540 | 24 | 1537 | 40 | 907 | 56 | 899 |
| 9 | 900 | 25 | 902 | 41 | 1542 | 57 | 1563 |
| 10 | 800 | 26 | 800 | 42 | 1603 | 58 | 1601 |
| 11 | 800 | 27 | 803 | 43 | 1600 | 59 | 1600 |
| 12 | 801 | 28 | 889 | 44 | 1599 | 60 | 1538 |
| 13 | 801 | 29 | 1520 | 45 | 1598 | 61 | 910 |
| 14 | 802 | 30 | 1600 | 46 | 1599 | 62 | 802 |
| 15 | 801 | 31 | 1602 | 47 | 1601 | 63 | 801 |
| 16 | 911 | 32 | 1602 | 48 | 1534 | 64 | 798 |
Data are divided into groups according to density of encoding N=16, are respectively following totally 16 groups (1～4) by sequence number, (5～8), (9～12) ... (61～64).Remove reflection interference regional value in two ends in every group according to step (7), (S/N) * λ/2 are 1 in this example, then are to remove 1 data at every group of data two ends; For example first group of legacy data sequence number as follows (1,2,3; 4), after two ends were respectively removed 1, sequence number just became (2; 3), see table 2 through remaining data after this step:
Table 2
The sampled value sequence number that this moment, each group was had is (2,3), (6,7), (10,11) ... (58,59), (62,63).Respectively each group is done comparison according to step in the principle (8) and sampling with reference to threshold values, for example to first group of sequence number be 2 data be 801＜sample with reference to threshold values 1200, be designated as low level; Second data sequence number be 3 data be 802＜sampling with reference to threshold values 1200, be designated as low level, low level occurs 2 times in this encoding domain, high level occurs 0 time, low level occurs so be the low level territory, being designated as 0 much larger than the high level occurrence number; Calculate each thresholding (comprise and comprise sampled value sequence number 2,3 first encoding domains) by that analogy and be followed successively by 0,1,0,0,1,1,0,1,1,0,1,1,0,0,1,0, the binary coding of expression is 0100110110110010, with preset consistent.
Each constant value is only as an encode laboratory reference of deciphering method of the present invention in this example.The present invention is not limited by above-mentioned constant value.Encode under the prerequisite of deciphering method step not breaking away from the present invention.Each constant value can change according to experimental data in allowed band.
More than show and described ultimate principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; The present invention is not restricted to the described embodiments; That describes in the foregoing description and the instructions just explains principle of the present invention; Under the prerequisite that does not break away from spirit and scope of the invention, the present invention also has various changes and modifications, and these variations and improvement all fall in the scope of the invention that requires protection.The present invention requires protection domain to be defined by appending claims and equivalent thereof.
Claims (4)
1. wheeled laser code device; It is characterized in that; Said code device comprises the bar code that is arranged on the curved surface, drive the curved surface motor rotating and bar code is separated read apparatus, and said bar code is separated read apparatus and comprised Laser emission element, laser pick-off element, photo-electric conversion element and encoding process element, and said curved surface bar code is the color lump sequence different to laser reflectivity; Said bar code is separated read apparatus and is launched laser beam through the Laser emission element; Through being received by the laser pick-off element behind the bar code camber reflection, convert voltage into through photo-electric conversion element, in the process that drive curved surface motor rotating rotates a circle; The encoding process element can receive on the curved surface each color lump sequence the contact potential series that laser beam reflects to form is read coded message through computational solution.
2. a wheeled laser code deciphering method is characterized in that said method comprises the steps:
(1) rotary setting has one week of swiveling wheel of bar code, and receives the reflected light that the bar code color lump is reflected;
(2) convert magnitude of voltage into according to the receiving light power degree, and voltage table is shown two kinds of level signals of height according to given threshold values;
(3) magnitude of voltage that in the monocycle rotary course, reception light is converted to is taken a sample, and converts monocycle receiving light power degree into the sampling voltage sequence through sampling;
(4) according to the density of encoding of design in advance, with one-period the sampling voltage sequence be divided into the encoding domain of corresponding number;
(5) the long interference value of removing corresponding proportion of the regional long and single encoding domain color lump of the low contrast ratio of color lump limit reflection that in each encoding domain, records according to experiment, high level occurrence number and low level occurrence number in the contact potential series that statistics is left;
(6), otherwise be designated as the low level territory if the high level occurrence number, remembers then that this encoding domain is the high level territory much larger than the low level occurrence number;
(7) at last with the high level territory as 1, the low level territory forms corresponding binary code sequence as 0.
3. a kind of wheeled laser code deciphering method according to claim 2 is characterized in that, said step (1) is carried out the swiveling wheel that rotary setting at the uniform velocity has bar code.
4. a kind of wheeled laser code deciphering method according to claim 2 is characterized in that, the sampling frequency of taking a sample in the said step (3) will be higher than the twice of the total periphery length of swiveling wheel divided by the length of the low contrast areas of color lump limit reflection.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103559472A (en) * | 2013-10-17 | 2014-02-05 | 步步高教育电子有限公司 | Device and method for identifying card identity identification code |
| CN103630177A (en) * | 2013-11-13 | 2014-03-12 | 深圳市兴源智能仪表科技有限公司 | Data collection method and coding testing method of metering device provided with photoelectric character wheels |
| CN104091141B (en) * | 2014-06-30 | 2018-02-06 | 立德高科(北京)数码科技有限责任公司 | Identification is implanted in the method and device of the dot pattern of curved surface article surface |
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| US5821524A (en) * | 1996-08-19 | 1998-10-13 | Pharmacopeia, Inc. | Method and apparatus for reading bar coded tubular members such as cylindrical vials |
| CN2747541Y (en) * | 2004-11-12 | 2005-12-21 | 深圳思创光电信息技术有限公司 | Colour bar code for character wheel of mechanical counter of meter and digital electric signal output device |
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| JPH038583A (en) * | 1989-06-05 | 1991-01-16 | Mitsubishi Electric Corp | Pulse arc welding equipment |
| JPH0438583A (en) * | 1990-06-04 | 1992-02-07 | Tokyo Electric Co Ltd | Stationary type bar code scanner |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103559472A (en) * | 2013-10-17 | 2014-02-05 | 步步高教育电子有限公司 | Device and method for identifying card identity identification code |
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| CN103630177A (en) * | 2013-11-13 | 2014-03-12 | 深圳市兴源智能仪表科技有限公司 | Data collection method and coding testing method of metering device provided with photoelectric character wheels |
| CN104091141B (en) * | 2014-06-30 | 2018-02-06 | 立德高科(北京)数码科技有限责任公司 | Identification is implanted in the method and device of the dot pattern of curved surface article surface |
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Application publication date: 20120425 |