CN108241813A - A kind of bar code decoding method and its equipment by laser ranging and automatic focusing - Google Patents
A kind of bar code decoding method and its equipment by laser ranging and automatic focusing Download PDFInfo
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- CN108241813A CN108241813A CN201611224151.0A CN201611224151A CN108241813A CN 108241813 A CN108241813 A CN 108241813A CN 201611224151 A CN201611224151 A CN 201611224151A CN 108241813 A CN108241813 A CN 108241813A
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- Prior art keywords
- bar code
- code decoding
- automatic focusing
- laser ranging
- camera lens
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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
- G06K7/10712—Fixed beam scanning
- G06K7/10762—Relative movement
- G06K7/10772—Moved readers, e.g. pen, wand
-
- 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
- G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
- G06K7/1404—Methods for optical code recognition
- G06K7/1408—Methods for optical code recognition the method being specifically adapted for the type of code
- G06K7/1413—1D bar codes
-
- 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
- G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
- G06K7/1404—Methods for optical code recognition
- G06K7/1408—Methods for optical code recognition the method being specifically adapted for the type of code
- G06K7/1417—2D bar codes
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Electromagnetism (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)
- Automatic Focus Adjustment (AREA)
Abstract
A kind of bar code decoding method and its equipment by laser ranging and automatic focusing passes through auto-focusing, improves decoding field depth, improves the decoding performance of wide bar code, the small bar code of high-precision.A variety of field depth demands are corresponded to by a kind of equipment, so as to reduce development cost and management of product cost.Equipment and barcode position can not changed, by changing focal length, photograph clearly bar code, and decoded for decoding chip, and improved decoding performance, by increasing aperture, reduce the requirement to extraneous light filling.
Description
Technical field
The present invention relates to bar code scan field more particularly to a kind of bar code decoding sides by laser ranging and automatic focusing
Method and its equipment.
Background technology
Bar code (abbreviation bar code) can be divided into bar code and two-dimensional bar code, and bar code is regularly arranged by one group
The label of item, sky and corresponding character composition, " item " refers to the part relatively low to light reflectance, and " sky " refers to light reflectance
Higher part, these information certain with the data representation of empty composition.Two-dimensional bar code is by one with specific geometric figure
The bar code of new generation of chequered with black and white rectangle square formation record data symbol information that set pattern rule is distributed in plane (on two-dimensional directional)
Technology.In daily life and commercial Application, the use of bar code is more and more extensive, such as：Retail trade, logistic industry, finance
Industry is increasing to the use demand of bar code.The development of barcode technology is very fast, and the development of barcode technology is to corresponding item
Code scanning device proposes higher requirement.
The composition of barcode scanner mainly coordinates camera lens by the sensor of front end in the prior art, acquires image data
And pass back to decoding chip and progress image identification is analyzed by software algorithm, so as to fulfill decoding, then decoding data is communicated and is arrived
Client.For some unconventional bar codes, such as high-precision bar code, long bar code, decoding now can be also realized, but decoding is relatively difficult,
Or could can only decode at some point, field depth is limited, and influences whether usage experience.The prior art will be taken into account simultaneously
Field depth so aperture is all smaller, in order to photograph high-visible figure, needs external stronger light filling to realize.Work as mesh
Mark and bar code scan equipment not timing, especially pipelining, fixed bar code scan equipment because the reason of fixed-focus for
Target beyond field depth can not decode.
Invention content
Under the conditions of the purpose of the present invention, the mainly fixed-focus of solution existing product, field depth is small, narrow application range, together
When aperture be limited by the problem of fixed focal length causes light filling environmental requirement harsh.
In order to solve the above-mentioned technical problem, the present invention uses following technical proposals：
A kind of bar code decoding equipment by laser ranging and automatic focusing, comprising
One bar code decoding chip；
One imaging modules, comprising camera lens, imaging sensor and voice coil motor；
One MCU；
One range finding chip；
Wherein, the MCU controls the range finding chip to measure the camera lens to the air line distance of target, while control institute
Stating voice coil motor drives the camera lens to be axially moveable to best focus position, and the bar code decoding chip obtains described image and passes
The captured image of sensor is decoded, and the MCU can call the number for being stored with the corresponding theoretical pinpointed focus of different distance
According to library.
The range finding chip is laser ranging chip, comprising laser emitter and photon inductive pick-up two parts, is passed through
It calculates photon and is issued to the time of reception to measure the distance of target object.
The camera lens is fixed on the carrier of the voice coil motor, and the MCU is by controlling the spring of the voice coil motor
The stretch position of piece, so as to adjust the position of the camera lens.
The imaging modules are furnished with large aperture, and it is 300lux to be applicable in light filling illuminance.
The bar code decoding equipment is also comprising buzzer, indicator light, headlamp, aiming lamp.
A kind of bar code decoding method by laser ranging and automatic focusing, system are imaged mould by bar code decoding chip
Group, comprising camera lens, imaging sensor and voice coil motor, MCU, range finding chip composition；
A kind of bar code decoding method by laser ranging and automatic focusing comprises the steps of：
S1：The bar code decoding system electrification；
S2：The range finding chip measures the camera lens and target range；
S3：The MCU is set according to pinpointed focus corresponding in measurement distance searching data library；
S4：The voice coil motor adjusts camera lens to pinpointed focus；
S5：Shooting image simultaneously decodes；
S6：Unsuccessful, the then voice coil motor lens fine-tuning focal length preset distance is decoded, repeats S5 steps；Successfully decoded
Then export decoding data.
In trim process, the voice coil motor is taken pictures after camera lens is driven to move forward respectively and moves preset distance afterwards, by described
Bar code decoding chip analyzes picture quality, selects subsequent movement direction.
After the automatic focusing, focus lock, the range finding chip is stopped, until being opened after decoding failure next time
Begin new ranging and automatic focusing flow.
The above technical solution of the present invention has the following advantages over the prior art：
By auto-focusing, decoding field depth is improved, the decoding performance of wide bar code, the small bar code of high-precision is improved, improves
Homogeneity of product corresponds to a variety of field depth demands by a kind of equipment, can so as to reduce development cost and management of product cost
Not change equipment and barcode position, by changing focal length, clearly bar code was photographed, decodes, carries for decoding chip
High decoding performance.By increasing aperture, the requirement to extraneous light filling is reduced.
Description of the drawings
In order to make the content of the present invention more clearly understood, it below according to specific embodiments of the present invention and combines
Attached drawing, the present invention is described in further detail, wherein
Fig. 1 is a kind of bar code decoding method by laser ranging and automatic focusing of one embodiment of the invention and its sets
Standby system block diagram.
Fig. 2 is a kind of bar code decoding method by laser ranging and automatic focusing of one embodiment of the invention and its sets
Standby work flow diagram.
Specific embodiment
As shown in Figure 1, it is a kind of bar code decoding method and its equipment by laser ranging and automatic focusing of the present invention
One embodiment system block diagram.It is described a kind of logical comprising one kind by the bar code decoding equipment of laser ranging and automatic focusing
The bar code decoding equipment of laser ranging and automatic focusing is crossed, comprising a bar code decoding chip, an imaging modules include mirror
Head, imaging sensor and voice coil motor, a MCU, a range finding chip.
Wherein, the MCU controls the range finding chip to measure the camera lens to the air line distance of target, while control institute
Stating voice coil motor drives the camera lens to be axially moveable to best focus position, and the bar code decoding chip obtains described image and passes
The captured image of sensor is decoded, and the MCU can call the number for being stored with the corresponding theoretical pinpointed focus of different distance
According to library.
Existing technical solution is applied on product, is all using manual focusing, is transferred to camera lens point in critical field again
Glue is fixed.Once camera lens dispensing is fixed, if desired for the field depth for changing this equipment, existing camera lens is with lens sleeve because of point
Glue is fixed, and can not be unscrewed again, then focus, and need to scrap camera lens and lens sleeve, it is also necessary to be dismantled equipment, be replaced
Lens sleeve and camera lens, there are the risks that material in disassembly process damages in this way.In the present embodiment, by the range finding chip and
The voice coil motor can realize auto-focusing.
The range finding chip is laser ranging chip, comprising laser emitter and photon inductive pick-up two parts, is passed through
It calculates photon and is issued to the time of reception to measure the distance of target object.In one embodiment, ST laser rangings is selected to pass
Sensor VL53L0X, operation principle are laser transmitter projects photons, will be reflected back after photon collision to target object
Come, photon inductive pick-up is received by photon.The MCU of the sensor internal of range finding chip is issued to reception by calculating photon
Time measure the distance of target object.The VL53L0X chips have 8 pins, pass through I2C and ST companies Cortex-M4MCU
(STM32F302CCT6) it is communicated.Laser range sensor can be stopped by two pins of XSHUT and GPIO1
And wake operation.
The camera lens is fixed on the carrier of the voice coil motor, and the MCU is by controlling the spring of the voice coil motor
The stretch position of piece, so as to adjust the position of the camera lens.When needing that field depth adjusting is re-started to equipment, without passing through
The method that detaching equipment replaces camera lens and lens sleeve, but controlled by software and carry out auto-focusing fixed-focus realization again.It is described
Voice coil motor, that is, VCM (Voice Coil Motor), the voice coil motor inside electronics, be motor one kind.Because principle and
Loud speaker is similar, so being voice coil motor, has the characteristics that high frequency sound, high-precision.Its cardinal principle is in a permanent-magnetic field
It is interior, by changing the DC current size of motor interior loop, to control the stretch position of spring leaf, move up and down so as to drive.
The size of VCM supply currents is controlled by Driver IC, it is suitable so as to adjust to determine the distance of the camera lens movement of VCM carryings
When position shooting clear image.
The imaging modules are furnished with large aperture, and it is 300lux to be applicable in light filling illuminance.In the prior art, equipment was producing
It focuses in journey according to standard field depth, is all to have precondition, is exactly 300lux light fillings.And the natural light one in practical application
As be all 200lux, appear in this way produce before fixed field depth index be unable to reach in actual field, because
Operator will not specially force 300lux and carry out light filling recognition in use.It can lead to some bar codes nothing in use in this way
Method reaches the quality problem for producing specification standards.Simultaneously as traditional fixed focal length pattern, causes aperture cannot for cooperated with depth of field
Excessive, the present invention increases aperture after solving the problems, such as autozoom, by camera lens, to reduce the demand of extraneous light filling or connect
Near-nature forest light.
The bar code decoding equipment is also comprising buzzer, indicator light, headlamp, aiming lamp.
As shown in Fig. 2, it is a kind of bar code decoding method and its equipment by laser ranging and automatic focusing of the present invention
One embodiment work flow diagram.Its system is by bar code decoding chip, imaging modules, comprising camera lens, imaging sensor and
Voice coil motor, MCU, range finding chip composition.Method comprises the steps of：
S1：The bar code decoding system electrification；
S2：The range finding chip measures the camera lens and target range；
S3：The MCU is set according to pinpointed focus corresponding in measurement distance searching data library；
S4：The voice coil motor adjusts camera lens to pinpointed focus；
S5：Shooting image simultaneously decodes；
S6：Unsuccessful, the then voice coil motor lens fine-tuning focal length preset distance is decoded, repeats S5 steps；Successfully decoded
Then export decoding data.
Wherein, the database that the MCU is called includes target range data corresponding with pinpointed focus, is early period according to survey
The theoretical value that obtains is tried, the influence that ambient lighting and bar code quality are limited in actual use also needs to the fine tuning of S6 steps.
In trim process, the voice coil motor is taken pictures after camera lens is driven to move forward respectively and moves preset distance afterwards, by described
Bar code decoding chip analyzes picture quality, selects subsequent movement direction.In one embodiment, before the voice coil motor first carries out
It moves and finely tunes and take pictures, until one mobile threshold value of successfully decoded or arrival, then move after reverse execution and finely tune and take pictures.
After the automatic focusing, focus lock, the range finding chip is stopped, until being opened after decoding failure next time
Begin new ranging and automatic focusing flow.In one embodiment, zoom becomes fixed-focus scheme, and test stone is：According to some bar code
Subject to, it controlling by software, after equipment focusing obtains clear image, software locks automatically, is controlled without voice coil motor, from
And product is locked as fixed-focus.According to the different field depths of customer demand ,-fixed-focus of focusing is carried out, makes and meets different visitors
The standard of family demand.
Obviously, the above embodiments are merely examples for clarifying the description, and is not intended to limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And the obvious variation thus extended out or
Among changing still in the protection domain of the invention.
Claims (8)
1. a kind of bar code decoding equipment by laser ranging and automatic focusing, comprising
One bar code decoding chip；
One imaging modules, comprising camera lens, imaging sensor and voice coil motor；
One MCU；
One range finding chip；
Wherein, the MCU controls the range finding chip to measure the camera lens to the air line distance of target, while control the sound
Coil motor drives the camera lens to be axially moveable to best focus position, and the bar code decoding chip obtains described image sensor
Captured image be decoded, the MCU can call the database for being stored with the corresponding theoretical pinpointed focus of different distance.
2. a kind of bar code decoding equipment by laser ranging and automatic focusing according to claim 1, which is characterized in that
The range finding chip is laser ranging chip, comprising laser emitter and photon inductive pick-up two parts, by calculating photon
The time of reception is issued to measure the distance of target object.
3. a kind of bar code decoding equipment by laser ranging and automatic focusing according to claim 2, which is characterized in that
The camera lens is fixed on the carrier of the voice coil motor, and the MCU is by controlling the stretching of the spring leaf of the voice coil motor
Position, so as to adjust the position of the camera lens.
4. a kind of bar code decoding equipment by laser ranging and automatic focusing according to claim 3, which is characterized in that
The imaging modules are furnished with large aperture, and it is 300lux to be applicable in light filling illuminance.
5. a kind of bar code decoding equipment by laser ranging and automatic focusing according to claim 4, which is characterized in that
The bar code decoding equipment is also comprising buzzer, indicator light, headlamp, aiming lamp.
6. a kind of bar code decoding method by laser ranging and automatic focusing, system is by bar code decoding chip, imaging modules,
Comprising camera lens, imaging sensor and voice coil motor, MCU, range finding chip composition；
It is characterized in that, a kind of bar code decoding method by laser ranging and automatic focusing comprises the steps of：
S1：The bar code decoding system electrification；
S2：The range finding chip measures the camera lens and target range；
S3：The MCU is set according to pinpointed focus corresponding in measurement distance searching data library；
S4：The voice coil motor adjusts camera lens to pinpointed focus；
S5：Shooting image simultaneously decodes；
S6：Unsuccessful, the then voice coil motor lens fine-tuning focal length preset distance is decoded, repeats S5 steps；Successfully decoded is then defeated
Go out decoding data.
7. a kind of bar code decoding method by laser ranging and automatic focusing according to claim 6, which is characterized in that
In trim process, the voice coil motor is taken pictures after camera lens is driven to move forward respectively and moves preset distance afterwards, passes through the bar code decoding
Chip analysis picture quality selects subsequent movement direction.
8. a kind of bar code decoding method by laser ranging and automatic focusing according to claim 7, which is characterized in that
After the automatic focusing, focus lock, the range finding chip is stopped, until starting new survey after decoding failure next time
Away from automatic focusing flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611224151.0A CN108241813A (en) | 2016-12-27 | 2016-12-27 | A kind of bar code decoding method and its equipment by laser ranging and automatic focusing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611224151.0A CN108241813A (en) | 2016-12-27 | 2016-12-27 | A kind of bar code decoding method and its equipment by laser ranging and automatic focusing |
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| CN108241813A true CN108241813A (en) | 2018-07-03 |
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| CN201611224151.0A Pending CN108241813A (en) | 2016-12-27 | 2016-12-27 | A kind of bar code decoding method and its equipment by laser ranging and automatic focusing |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108833793A (en) * | 2018-08-27 | 2018-11-16 | 深圳艺达文化传媒有限公司 | The focusing method and Related product of promotion video |
| CN109286752A (en) * | 2018-09-28 | 2019-01-29 | 东莞华贝电子科技有限公司 | Vision inspection apparatus and automatic focusing method |
| CN113312933A (en) * | 2021-05-07 | 2021-08-27 | 苏州视印智能系统有限公司 | Fixed industrial code reader capable of automatically adjusting focal length and automatic focusing method |
| CN116709017A (en) * | 2022-09-26 | 2023-09-05 | 荣耀终端有限公司 | Code scanning method and electronic equipment |
-
2016
- 2016-12-27 CN CN201611224151.0A patent/CN108241813A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108833793A (en) * | 2018-08-27 | 2018-11-16 | 深圳艺达文化传媒有限公司 | The focusing method and Related product of promotion video |
| CN109286752A (en) * | 2018-09-28 | 2019-01-29 | 东莞华贝电子科技有限公司 | Vision inspection apparatus and automatic focusing method |
| CN113312933A (en) * | 2021-05-07 | 2021-08-27 | 苏州视印智能系统有限公司 | Fixed industrial code reader capable of automatically adjusting focal length and automatic focusing method |
| CN116709017A (en) * | 2022-09-26 | 2023-09-05 | 荣耀终端有限公司 | Code scanning method and electronic equipment |
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Application publication date: 20180703 |