CN105844197A - Double lens image collecting and processing device used for DPM code reader - Google Patents
Double lens image collecting and processing device used for DPM code reader Download PDFInfo
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- CN105844197A CN105844197A CN201610205271.XA CN201610205271A CN105844197A CN 105844197 A CN105844197 A CN 105844197A CN 201610205271 A CN201610205271 A CN 201610205271A CN 105844197 A CN105844197 A CN 105844197A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
- G06K7/10821—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum further details of bar or optical code scanning devices
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
- G06K7/10821—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum further details of bar or optical code scanning devices
- G06K7/10831—Arrangement of optical elements, e.g. lenses, mirrors, prisms
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
- G06K7/10821—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum further details of bar or optical code scanning devices
- G06K7/10861—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum further details of bar or optical code scanning devices sensing of data fields affixed to objects or articles, e.g. coded labels
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Image Processing (AREA)
- Image Input (AREA)
Abstract
The invention discloses a double lens image collecting and processing device used for a DPM (Direct Part Marketing) code reader, comprising imaging devices, an image preprocessing unit and a main control unit which are in electric connection; the number of the imaging devices is two, and the two imaging device are separated; the optical lens optical axes of the two imaging devices form a certain angle; the imaging devices shoot DPM codes from different angles under the control of the main control unit, and send shot images to the image preprocessing unit; the image preprocessing unit receives the DPM codes shot by the imaging devices, and perform fusion and compensation rectification on images so as to obtain corrected DPM code images.
Description
Technical field
The present invention relates to direct parts mark (Direct
Part Marking is abbreviated as DPM) code identification field, it is specifically related to a kind of double lens image acquisition for DPM code reader and processing means.
Background technology
The data capacity that Quick Response Code possesses is big, error correcting capability strong, high reliability makes its range of application more and more extensive, along with planar bar code technology develops rapidly, the continuous extension of range of application, persistently going deep into of Quick Response Code automatic identification technology research, builds and is specific to industry DPM (Direct Part Mark direct parts mark) code automatic recognition system and by the strongest for the requirement of its industrialization.
Conventional two-dimensional bar code substantially uses printing means to realize, and this kind of Quick Response Code, easily along with the abrasion, fuzzy and become unreadable, easily lose of leaflet, exists and do not supports that Life cycle reviews ability, the shortcoming such as irredundant.DPM code is then to be beaten the industry means such as shock, electrochemical corrosion rather than to be produced on by code on an other carrier at the surface of parts direct mark code by laser-induced thermal etching, machine.These means reflect a maximum feature of DPM code: permanent.This tracking making product production process on a production line neutralize the logistics link after rolling off the production line is possibly realized.
DPM code generating method and use the multiformity of material cause actual acquisition to two-dimensional barcode image can be affected by illumination effect, complex background interference, the situation such as inclination of bar code of shooting, this gives follow-up identifying, and work brings huge difficulty, therefore, how research can identify that the device of DPM code has become as an important field of research accurately and rapidly.
The most general Quick Response Code code reader is mainly by light source, receive device, photoelectric conversion part, decoding unit and computer interface composition, basic functional principle is: the light sent by light source is above irradiation optical system to bar code symbol, wavelength difference due to the visible ray that the object of different colours reflects, white object can launch the visible ray of various wavelength, black object then absorbs the visible ray of various wavelength, the light being reflected back through optical system imaging on optical-electrical converter, it is allowed to produce the signal of telecommunication, signal voltage be irradiated to the light strong correlation that is reflected back on bar code symbol, the signal of telecommunication is through the amplification of oversampling circuit, the most after filtering, shaping, form the square-wave signal corresponding with analogue signal, decoded unit decodes, complete bar code and distinguish the overall process of reading.The most general DPM code reader is single-lens, and the present invention provides a kind of double lens image acquisition and processing means, and two camera lenses can have different optical parametrics, and this does not has the advantage that having single-lens device.Code reader is divided by scan mode, can be divided into contact and contactless two kinds.Contact type code reader must contact with bar code, can be only achieved the purpose reading data.As long as contactless bar code code reader is in effective field depth, light source irradiates Quick Response Code can be automatically performed scanning.Contactless code reader three reads greatly the type of skill and is respectively as follows: planar array scanning system based on image, laser scanner, linear scanning system, and most common of which is planar array scanning system based on image, and its composition is as shown in Figure 1.This planar array scanning based on image reads system and uses a camera head, and shoots DPM code image from front.Single-lens it is typically only capable to receiving plane information, and spatial information cannot be obtained, therefore the highest for directly beating the DPM code resolution capability of the industry means realizations such as shocks, electrochemical corrosion at material surface laser-induced thermal etching, machine.It addition, compared to the Quick Response Code of black and white printing, the picture contrast of DPM code is relatively low, when applying this system to identify DPM Quick Response Code, its identification ability is the lowest.
Summary of the invention
Present invention aim to address the defect of prior art, it is provided that a kind of double lens image acquisition for DPM code reader and processing means, the technical scheme of employing is as follows:
A kind of double lens image acquisition for DPM code reader and processing means, including the camera head being electrically connected to each other, image pre-processing unit and main control unit, described camera head has two, and keep at a certain distance away installation, and the optical lens optical axis of two camera heads is angled；DPM code is shot under the control of main control unit by described camera head from different angles, and the image photographed is sent to image pre-processing unit；Described image pre-processing unit receives the DPM code of camera head shooting and processes image, thus obtains the DPM code image revised.
The present invention uses two independent camera heads to shoot DPM code, every camera head has different imaging angles for target to be captured, when material surface is existed concavo-convex DPM code imaging, left side camera head can obtain information on the left of more target, and right side camera head can obtain information on the right side of more target.Relative to the DPM code reader of a camera head, the present invention can increase light-inletting quantity, strengthens shooting effect during insufficient light；And, at least the optical lens optical axis of a filming apparatus is not orthogonal to DPM code place material surface, the mode of this tilt breaches the limitation from the three-dimensional target of vertical angle shooting, gather image from different angles simultaneously, more target three-dimensional spatial information can be obtained, improve the system resolution capability to DPM code.The pretreatment that image is carried out by image pre-processing unit is for merging into each other to image and compensate rectification, it should be noted that, the image pre-processing unit of the present invention has the image using software algorithm to photograph each camera head to merge, compensate and correct, having software algorithm that is a lot of ripe or that increase income in image processing field, those skilled in the art can select or revise these existing software algorithms as required and merge image, compensate and correct.
As preferably, present invention additionally comprises the auxiliary lighting apparatus electrically connected with main control unit, described auxiliary lighting apparatus is arranged on the periphery of two camera heads, and it is under main control unit control, illuminates DPM code target.
As preferably, present invention additionally comprises the auxiliary lighting apparatus electrically connected with main control unit, described auxiliary lighting apparatus is positioned in the middle of two camera heads, and it is under main control unit control, illuminates DPM code target.
DPM code is to pass through laser engraving, mechanical stipple, the industry means such as electrochemical corrosion directly form identification code on the surface of parts, material surface convex-concave information is so just only existed on surface, it is different from the high-contrast optics information of common printed bar code, use common bar code reading device imaging device to collect sharp picture or the picture quality that collects is poor, and the present invention is by between optical lens and optical lens periphery arranges auxiliary lighting apparatus, and the target area of the light irradiation that auxiliary lighting apparatus sends is controlled by main control unit, it is made to form a hot spot being different from ambient lighting in heart region in the target, the light of target area scattering projects on two imaging devices through camera lens respectively, so, just can collect the convex-concave information of material surface, improve image quality, improve follow-up DMP code recognition accuracy.The light source of auxiliary lighting apparatus is HONGGUANG or green glow or white LED light source.
As preferably, the optical axis included angle scope of the optical lens of described camera head is 0 degree to 150 degree.
As preferably, said two camera head uses the camera lens that optical parametric is identical.
As preferably, said two camera head uses the camera lens that optical parametric is different.
As preferably, described camera head includes optical lens and the imaging device set gradually, and described imaging device is ccd image sensor or cmos image sensor, electrically connects with main control unit.
Compared with prior art, beneficial effects of the present invention:
1, DPM code is shot by the camera head that the present invention uses two sets independent, and light-inletting quantity is greatly improved, and can improve image quality under low luminous environment, and the image of two camera heads compensates fusion, it is possible to reduce the noise of image, improves signal to noise ratio.
2, two set camera heads have different imaging angles for target to be captured, when material surface is existed concavo-convex DPM code imaging, relative to the system of a camera head, the present invention can obtain more object space depth information, is greatly improved the reader system identification ability to DPM code.
3, the two independent camera heads of set can use the optical lens of different focal and different exposure parameters to shoot, obtain the different image of two width to carry out merging, compensate and correcting by image processing algorithm, DPM code reader can be made to have the bigger identification depth of field and adapt to more complicated photoenvironment.
Accompanying drawing explanation
Fig. 1 is the structural representation of traditional planar array scanning system based on image；
Fig. 2 is the system structure schematic diagram of the embodiment of the present invention 1；
Fig. 3 is the profile of the twin-lens of the embodiment of the present invention 1；
Fig. 4 is the fundamental diagram using general lighting technology to carry out image acquisition；
Fig. 5 is the fundamental diagram that the embodiment of the present invention 1 carries out image acquisition；
Fig. 6 is the internal system attachment structure schematic diagram of the embodiment of the present invention 2.
Detailed description of the invention
With embodiment, the present invention is described in further detail below in conjunction with the accompanying drawings.
Embodiment:
Embodiment 1: as shown in Figures 2 and 3, a kind of double lens image acquisition for DPM code reader and processing means, including the camera head being electrically connected to each other, image pre-processing unit and main control unit, described camera head has two, keep at a certain distance away installation, and the optical lens optical axis of two camera heads is angled；DPM code is shot under the control of main control unit by described camera head from different angles, and the image photographed is sent to image pre-processing unit；Described image pre-processing unit receives the DPM code of camera head shooting and image merges into each other and compensates rectification, thus obtains the DPM code image revised.
In the present embodiment, described a kind of double lens image acquisition for DPM code reader and processing means, also include the auxiliary lighting apparatus electrically connected with main control unit, described auxiliary lighting apparatus is positioned at the centre of two camera heads and is arranged on the periphery of two camera heads, it is under main control unit control, illuminates DPM code target.
In the present embodiment, the optical axis included angle scope of the optical lens of described camera head is 0 degree to 150 degree.
In the present embodiment, said two camera head uses the camera lens that optical parametric is identical.
In the present embodiment, described camera head includes optical lens and the imaging device set gradually, and described imaging device is ccd image sensor or cmos image sensor, electrically connects with main control unit.Wherein in Fig. 3,21 and 22 is optical lens, and 31 and 32 is imaging device.
In the present embodiment, by between optical lens and optical lens periphery is respectively provided with auxiliary lighting apparatus 12 and 11, and the target area of the light irradiation that auxiliary lighting apparatus 11 and 12 sends is controlled by main control unit, it is made to form a hot spot being different from ambient lighting in heart region in the target, the light of target area scattering is on the camera head that camera lens projects correspondence respectively, it is possible to provide field range indicates and improves object illumination.The light source of auxiliary lighting apparatus 11 and 12 is HONGGUANG.
In the present embodiment, the collaborative work under the control of main control unit of auxiliary lighting apparatus, camera head and image pre-processing unit；Auxiliary lighting apparatus illuminates target area under the control of main control unit, and the image photographed is sent to image pre-processing unit under the control of main control unit by camera head, image pre-processing unit merge image, compensate and correct.
For common printed code, DPM code is to pass through laser-induced thermal etching, shock beaten by machine, the industry means such as electrochemical corrosion are formed at the direct mark in the surface of parts code, material surface convex-concave information is so just only existed on surface, and there is not the optics monochrome informatio of high-contrast, general lighting technology is used to be difficult to the poor image quality collecting sharp picture or collecting, the operation principle of its image acquisition is as shown in Figure 4, in figure, 20 is optical lens, 01 is material surface, 02 is DPM code concave surface, 03 is the interface of material surface 01 and DPM code concave surface 02, 01, 02, 03 imaging corresponding part is 301, 302 and 303, wherein interface 03 imaging 303 only a profile the thinnest, it is difficult to differentiate.
And the present embodiment uses two independent camera heads to shoot DPM code, every camera head has different imaging angles for target to be captured, the operation principle of its image acquisition is as shown in Figure 5, in figure, 21 and 22 is two pick-up lenss, 04 is material surface, 05 is DPM code concave surface, 06 is the interface of material surface 04 and DPM code concave surface 05, 04, 05, after two width image co-registration formed by 06, corresponding part is 301, 302 and 303, as can be seen from the figure, owing to the visual angle of double camera heads is different, more target side surface information can be photographed, after two width image co-registration, there is larger area and profile clearly as 306 corresponding to interface 06, resolution capability is greatly improved.When material surface exists concavo-convex DPM code imaging, left side camera head can obtain information on the left of more target, and right side camera head can obtain information on the right side of more target.Relative to the DPM code reader of a camera head, the present embodiment can increase light-inletting quantity, strengthens shooting effect during insufficient light；And, at least the optical lens optical axis of a filming apparatus is not orthogonal to DPM code place material surface, the mode of this tilt breaches the limitation from the three-dimensional target of vertical angle shooting, gather image from different angles simultaneously, each image merges into each other and compensates rectification, more target three-dimensional spatial information can be obtained, improve the system resolution capability to DPM code.
Embodiment 2: as shown in Figure 6, a kind of DPM code recognition device based on twin-lens, including the above-mentioned double lens image acquisition for DPM code reader and processing means, also include that decoding apparatus 5, described decoding apparatus 5 receive image that image preprocess apparatus 4 processed and solve the information that DPM image in 2 D code is comprised.
Described decoding apparatus 5 electrically connects with main control unit 7 and image preprocess apparatus 4 respectively, and described image preprocess apparatus 4 also electrically connects with main control unit 7.
Image merges by image preprocess apparatus, complementary and after correcting, under the control of main control unit, image complete for pretreatment is sent to decoding apparatus, decoding apparatus solves the information that DPM image in 2 D code is comprised.
Described DPM code recognition device based on twin-lens also includes the communication device 6 electrically connected with main control unit 1.
Claims (8)
1. the double lens image acquisition for DPM code reader and processing means, including the camera head being electrically connected to each other, image pre-processing unit and main control unit, it is characterized in that, described camera head has two, keep at a certain distance away installation, and the optical lens optical axis of two camera heads is angled；DPM code is shot under the control of main control unit by described camera head from different angles, and the image photographed is sent to image pre-processing unit；Described image pre-processing unit receives the DPM code of camera head shooting and processes image, thus obtains the DPM code image revised.
A kind of double lens image acquisition for DPM code reader the most according to claim 1 and processing means, it is characterized in that, also include the auxiliary lighting apparatus electrically connected with main control unit, described auxiliary lighting apparatus is arranged on the periphery of two camera heads, it, under main control unit control, illuminates target.
A kind of double lens image acquisition for DPM code reader the most according to claim 1 and processing means, it is characterized in that, also include the auxiliary lighting apparatus electrically connected with main control unit, described auxiliary lighting apparatus is positioned at the centre of two camera heads, it, under main control unit control, illuminates target.
A kind of double lens image acquisition for DPM code reader the most according to claim 1 and processing means, it is characterised in that the optical axis included angle scope of the optical lens of described camera head is 0 degree to 150 degree.
A kind of double lens image acquisition for DPM code reader the most according to claim 1 and processing means, it is characterised in that said two camera head uses the camera lens that optical parametric is identical.
A kind of double lens image acquisition for DPM code reader the most according to claim 1 and processing means, it is characterised in that said two camera head uses the camera lens that optical parametric is different.
A kind of double lens image acquisition for DPM code reader the most according to claim 1 and processing means, it is characterized in that, described camera head includes optical lens and the imaging device set gradually, described imaging device is ccd image sensor or cmos image sensor, electrically connects with main control unit.
A kind of double lens image acquisition for DPM code reader the most according to claim 1 and processing means, it is characterised in that a described camera head at least employing zoom lens.
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| CN109145672A (en) * | 2017-06-19 | 2019-01-04 | 北京微光互联科技有限公司 | DPM two-dimensional code identification method is realized based on dual camera |
| CN110991206A (en) * | 2019-12-19 | 2020-04-10 | 广东旭龙物联科技股份有限公司 | Reflective lens-free DPM imaging system |
| CN113378596A (en) * | 2021-05-19 | 2021-09-10 | 深圳市民德电子科技股份有限公司 | Bar code reading device based on at least two cameras |
| JP2022105618A (en) * | 2016-09-19 | 2022-07-14 | ハンド ヘルド プロダクツ インコーポレーティッド | Dot peen mark image acquisition |
| WO2022241685A1 (en) * | 2021-05-19 | 2022-11-24 | 深圳市民德电子科技股份有限公司 | Barcode reading apparatus based on at least two cameras |
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| CN110991206B (en) * | 2019-12-19 | 2023-09-19 | 广东旭龙物联科技股份有限公司 | Reflection type lens-free DPM imaging system |
| CN113378596A (en) * | 2021-05-19 | 2021-09-10 | 深圳市民德电子科技股份有限公司 | Bar code reading device based on at least two cameras |
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| CN105844197B (en) | 2018-03-02 |
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