CN105095813A - Reading method and reading equipment for ultraviolet fluorescent bar code - Google Patents
Reading method and reading equipment for ultraviolet fluorescent bar code Download PDFInfo
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Abstract
The invention relates to a reading method and reading equipment for an ultraviolet fluorescent bar code. The reading method comprises the following steps of S1, irradiating the ultraviolet fluorescent bar code by an ultraviolet light source and exciting the ultraviolet fluorescent bar code to a visible state; S2, acquiring the image of the bar code which is excited to the visible state; S3, performing filtering and decoding on the image of the bar code, thereby obtaining corresponding bar code information; and S4, outputting the information of the bar code; wherein the step S3 comprises S3.1, selecting one color filter from a plurality of preset color filters for performing filtering processing on the image of the bar code, and generating a gray-scale image; and S3.2, performing decoding on the gray-scale image, if decoding succeeds and corresponding bar code information is obtained, performing the step S4; and otherwise returning to the step S3.1. According to the reading method and the reading equipment, a invisible ultraviolet fluorescent bar code is read through the color filter, thereby realizing convenient use and improving applicability in reading.
Description
Technical field
The present invention relates to technical field of image processing, more particularly, relate to a kind of reading method and equipment of Ultraluminescence bar code.
Background technology
The principle that UV-irradiation fluorescence material sends visible ray is: when electron collision in atom in UV radiation photon and fluorescent material, it brings up to higher energy level electronics, and excited electron is discharged into lower energy level and luminous with the lower energy photon form in visible-range subsequently.
Fluoresent printing ink (UltravioletFluorescentInk) is made by adding corresponding visible fluorescence compound in ink.Because fluorescent component is different from ratio, adopt the bar pattern that fluoresent printing ink is printed, can be cannot see (stealth) under ordinary ray, or present and print different shinny color with conventional printing ink; And under UV-irradiation, the phosphor pattern of clear light or the light of exception can be presented.Different fluorescence materials, the ultraviolet source of different wave length and their combination, the color of the phosphor pattern presented can be varied: as red, yellow, green, blue etc.
The form changed by exciting color, can be divided into colourless, coloured and tenebrescent ink.Pattern after colorless fluorescent ink printing is stealthy under natural light, presents the phosphor pattern of clear light under UV-irradiation, bright in luster.Colored fluorescent ink has color under natural light, and under uviol lamp, original color is shinny, presents fluorescent effect.Tenebrescent ink presents a kind of color under natural light, under uviol lamp, then present another kind of fluorescence color.
Fluoresent printing ink is adopted to carry out the bar code of printing, there are naked eyes invisible or not easily see, advantages such as (chromatographys) cannot be copied, can be applicable to bill, card, cigarette, wine, medicine, cosmetics label, packaging, instructions etc. there is the printing of higher false proof requirement, be with a wide range of applications.Therefore, be necessary to design a kind of bar code recognizing apparatus, the bar code that fluoresent printing ink prints is distinguished.
Summary of the invention
The technical problem to be solved in the present invention is, provides a kind of reading method and equipment of Ultraluminescence bar code easy to use.
The technical solution adopted for the present invention to solve the technical problems is: the reading method providing a kind of Ultraluminescence bar code, comprises the following steps:
S1, excited as visible state by the stealthy Ultraluminescence bar code of ultraviolet source irradiation;
S2, gather and be activated into the bar code image of visible state;
S3, described bar code image carried out to filtering, decoding process, to obtain corresponding bar code information;
S4, export described bar code information;
Wherein, step S3 comprises:
S3.1, from multiple predetermined color filter select a color filter filtering process is carried out to described bar code image, generate gray-value image;
S3.2, described gray-value image carried out to decoding process, if successfully decoded obtains corresponding bar code information, perform step S4; If unsuccessful, return step S3.1.
Preferably, in described step S3.2, work as successfully decoded, then using predetermined color filter corresponding for this successfully decoded as preferred filter; In upper bar code reading process once, the described preferred filter of preferential use carries out filtering process to gathered bar code image.
Preferably, this reading method also comprised S0, determines predetermined color filter before described step S1; Described step S0 comprises:
S0.1, with ultraviolet source irradiation for determining the stealthy Ultraluminescence bar code of predetermined color filter and being excited as visible state;
S0.2, gather and be activated into the bar code image of visible state;
S0.3, from multiple color filter, select a color filter to carry out filtering process to gathered bar code image by pre-defined rule, generate gray-value image;
S0.4, described gray-value image carried out to decoding process, to obtain corresponding bar code information; If successfully decoded, using color filter corresponding for successfully decoded as predetermined color filter; If unsuccessful, return step S0.3.
Preferably, repeating said steps S0.1-S0.4, respectively to multiple for determining that the stealthy Ultraluminescence bar code of predetermined color filter is distinguished, to obtain multiple predetermined color filter.
Preferably, in described step S3.1, described color filter be the color filter based on RGB color model, the color filter based on HSI color model, the color filter based on HSV color model, the color filter based on HSL color model, based on the color filter of CMY color model or the color filter based on CMYK color model.
The invention provides the reading method of another kind of Ultraluminescence bar code, comprise the following steps:
S1 ＇, excited as visible state by the stealthy Ultraluminescence bar code of ultraviolet source irradiation;
S2 ＇, gather and be activated into the bar code image of visible state;
S3 ＇, use a predetermined color filter to carry out filtering process to described bar code image, generate gray-value image;
S4 ＇, described gray-value image carried out to decoding process, obtain corresponding bar code information;
S5 ＇, export described bar code information.
The present invention also provides a kind of recognizing apparatus of Ultraluminescence bar code, comprising:
For irradiating stealthy Ultraluminescence bar code and described bar code being excited the ultraviolet source into visible state;
For gathering the image acquisition device of the bar code image being activated into visible state;
For receiving the bar code image of described image acquisition device collection and adopting predetermined color filter that described bar code image is carried out to filtering process, generates the filter unit of gray-value image;
For carrying out decoding process to described gray-value image with the demoder obtaining corresponding bar code information; And
Described bar code information is carried out the output unit exported.
Preferably, described filter unit comprises one or more color filter; Described predetermined color filter is selected to determine from multiple described color filter.
Preferably, this recognizing apparatus also comprises:
Using the selection unit of predetermined color filter corresponding for successfully decoded as preferred filter, wherein, in upper bar code reading process once, the described preferred filter of preferential use carries out filtering process to gathered bar code image.
Preferably, described color filter be the color filter based on RGB color model, the color filter based on HSI color model, the color filter based on HSV color model, the color filter based on HSL color model, based on the color filter of CMY color model or the color filter based on CMYK color model.
The present invention is distinguished stealthy Ultraluminescence bar code by the color filter of software form, easy to use, compared to the optically filtering sheet that traditional recognizing apparatus adopts, improve the applicability of recognition, can distinguish multiple stealthy Ultraluminescence bar code, and multiple corresponding recognizing apparatus need do not purchased for the Ultraluminescence bar code of different fluorescence color, fluorescence bands or fluorescence material, thus reduce use cost.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the reading method process flow diagram of the Ultraluminescence bar code of one embodiment of the invention;
Fig. 2 is the reading method process flow diagram of the Ultraluminescence bar code of another embodiment of the present invention;
Fig. 3 is the structural representation of the colour wheel that in the present invention, HSI wave filter is corresponding;
Fig. 4 is the recognizing apparatus logical diagram of the Ultraluminescence bar code of one embodiment of the invention.
Embodiment
As shown in Figure 1, the reading method of the Ultraluminescence bar code of one embodiment of the invention, comprises the following steps:
S1, to be excited as visible state by the stealthy Ultraluminescence bar code of ultraviolet source irradiation.
Stealthy Ultraluminescence bar code is formed by the ink printing being added with visible fluorescence compound, by adding the visible fluorescence compound of heterogeneity or ratio, can be printed as the bar code of different excited state color, can present the bar code of visible state under UV-irradiation.In this step, adopt ultraviolet source first to excite Ultraluminescence bar code, be convenient to follow-up bar code image collection.Described bar code can be one-dimension code or Quick Response Code.
S2, gather and be activated into the bar code image of visible state.
In this step S2, the bar code image of collection all converts the color digital image based on RGB color model to, for the filtration treatment of follow-up predetermined color filter.
S3, bar code image carried out to filtering, decoding process, to obtain corresponding bar code information.Bar code image in this step is the color digital image based on RGB color model.
S4, output bar code information.
Wherein, step S3 comprises:
S3.1, the color filter that selection one is predetermined from multiple predetermined color filter carry out filtering process to bar code image, generate gray-value image;
S3.2, gray-value image carried out to decoding process, if successfully decoded obtains corresponding bar code information, perform step S4; If unsuccessful, return step S3.1.In this step S3.2, decoding process step can be divided into two steps: S3.2.1, carry out module location to gray-value image, and extracts corresponding numerical matrix; S3.2.2, logarithm value matrix carry out decoding process, to obtain bar code information.
Particularly, in step S3.1, the color filter that first employing one is predetermined carries out filtering process to bar code image, generates gray-value image; This gray-value image carries out decoding process in this step S3.2, if successfully decoded obtains corresponding bar code information, perform step S4, export bar code information, recognition terminates; If unsuccessful, return step S3.1, the color filter selecting another predetermined carries out filtering process to bar code image, generates gray-value image; Then carry out step S3.2 again, until successfully decoded, obtain corresponding bar code information and export.In addition, in step S3.1, can by pre-defined rule as successively, the predetermined color filter of the rules selection such as traversal carries out filtering process to bar code image, avoid to predetermined color filter repeat select.
In step s3, described color filter exists with the form of software filter, leaches the parameter information of color needed for software filter comprises.The stealthy Ultraluminescence bar code distinguished as required therefrom selects corresponding color filter as predetermined color filter, carries out filtration treatment to stealthy Ultraluminescence bar code.In actual applications, when the fluorescent wavelength ranges of stealthy Ultraluminescence bar code after being excited that needs carry out distinguishing is unknown, adopt all colours wave filter to carry out recognition so that successfully decoded, the operational ton time that is large, that expend is many, affects decoding effect.Therefore, by arranging the color filter of comparatively often use as predetermined color filter in advance, predetermined color filter is then directly used to carry out filtering process when distinguishing, by follow-up decoding process, rapidly bar code decoding is successfully obtained bar code information, easy to use, thus do not need to use all or most of color filter to carry out filtering process successively, avoid because a large amount of operation causes too much time consumption; By arranging multiple predetermined color filter, be applicable to the recognition of multiple stealthy Ultraluminescence bar code, compared to the optically filtering sheet that traditional recognizing apparatus adopts, improve the applicability of recognition, multiple corresponding recognizing apparatus need do not purchased for the stealthy Ultraluminescence bar code of different fluorescence color, fluorescence bands or fluorescence material, thus significantly reduce use cost.
Further, in step S3.2, work as successfully decoded, then using predetermined color filter corresponding for this successfully decoded as preferred filter; In upper bar code image recognition process once, the preferential preferred filter that uses carries out filtering process to gathered bar code image.In upper bar code image recognition once, in step S3.1, use preferred filter to carry out filtering process to gathered bar code image, generate gray-value image; In step S3.2, decoding process is carried out to gray-value image, if successfully decoded obtains corresponding bar code information, then perform step S4, output; If unsuccessful, return step S3.1, the color filter adopting another predetermined processes bar code image, until successfully decoded.
Understandably, when distinguishing first, by predetermined color filter, the bar code image gathered first being processed, being decoded, and using that corresponding for successfully decoded predetermined color filter as preferred filter.Certainly, this predetermined color filter corresponding to successfully decoded may be first wave filter carrying out processing, and also may be second or the 3rd wave filter carrying out processing just acquisition successfully decoded even more below.When second time is distinguished, then first use preferred filter to process the bar code image that second time gathers, decode, successfully decoded then obtains corresponding bar code information; Unsuccessful then continuation of decoding uses next predetermined color filter again to bar code image process, decoding, until successfully decoded, and using that corresponding for this second time recognition successfully decoded predetermined color filter again as preferred filter.
When distinguishing with a collection of stealthy Ultraluminescence bar code, then first time distinguishes determined preferred filter, follow-up recognition this note of instruction code all adopts this preferred filter to process, decode, and do not need to re-use other predetermined color filter process, efficiency is fast.When then distinguishing another batch of stealthy Ultraluminescence bar code, then redefine another preferred filter, to carry out processing, decoding, by that analogy when the first time recognition to this note of instruction code.
The reading method of this embodiment also comprised S0, determines predetermined color filter before step S1; Step S0 can comprise:
S0.1, with ultraviolet source irradiation for determining the stealthy Ultraluminescence bar code of predetermined color filter and being excited as visible state.For determining the stealthy Ultraluminescence bar code sample that the stealthy Ultraluminescence bar code of predetermined color filter is follow-up needs and carries out distinguishing.
S0.2, gather and be activated into the bar code image of visible state.
S0.3, from multiple color filter, select a color filter to carry out filtering process to gathered bar code image by pre-defined rule, generate gray-value image.Pre-defined rule is successively or the rule such as traversal, selects color filter to carry out filtering process to bar code image by pre-defined rule, avoid to color filter repeat select.
S0.4, gray-value image carried out to decoding process, to obtain corresponding bar code information; If successfully decoded, using color filter corresponding for successfully decoded as predetermined color filter; If unsuccessful, return step S0.3.
Step S0 also can comprise: S0.5, output bar code information.
Particularly, in step S0.3, in multiple color filter, sequentially first use a color filter to carry out filtering process to gathered bar code image, generate gray-value image; In step S0.4, carry out decoding process to this gray-value image, successfully decoded then obtains corresponding bar code information, and performs step S0.5, output, and stores as predetermined color filter using color filter corresponding for successfully decoded; Decode unsuccessful, return step S0.3, use next color filter to process gathered bar code image, until successfully decoded, and the color filter of correspondence is stored as predetermined color filter.
In above-mentioned steps S0, for determining that the stealthy Ultraluminescence bar code of predetermined wave filter can be one or more; Preferably, adopt multiple stealthy Ultraluminescence bar code to determine multiple predetermined color filter.By repeat S0.1-S0.4, respectively to multiple for determining that the stealthy Ultraluminescence bar code of predetermined color filter is distinguished, obtain multiple predetermined color filter.
Predetermined color filter quantity is unsuitable too many, and the operation of software to image filtering can be caused too much many, consuming time, affect decoding effect, as being set as less than 20, the quantity of this predetermined color filter can be arranged according to the actual use of user.In software filter, storage module can be had to store predetermined color filter.In software filter, mode of learning and using forestland can being had, when determining predetermined color filter, operating with reference to step S0 after selecting mode of learning; When carrying out bar code reading in actual use, then choice for use pattern, with reference to step S1-S4 to obtain bar code information.
When distinguishing a certain stealthy Ultraluminescence bar code in actual applications, all predetermined color filters are all decoded unsuccessful, the color filter to stealthy Ultraluminescence bar code should be planted is not had temporarily in so predetermined color filter, now can enter mode of learning again, adopt step S0 operation, redefine predetermined color filter.
According to practical application, when user only needs to distinguish a kind of stealthy Ultraluminescence bar code, for making recognition more efficient and convenient, a predetermined color filter can be only set.As shown in Figure 2, the reading method of another embodiment of the present invention Ultraluminescence bar code, comprises the following steps:
S1 ＇, to be excited as visible state by the stealthy Ultraluminescence bar code of ultraviolet source irradiation.
S2 ＇, gather and be activated into the bar code image of visible state.
S3 ＇, use a predetermined color filter to carry out filtering process to bar code image, generate gray-value image.This predetermined color filter carries out operation acquisition with reference to the step S0 of above-described embodiment, and understandably, this predetermined color filter also can be changed according to the replacing of stealthy Ultraluminescence bar code.
S4 ＇, gray-value image carried out to decoding process, obtain corresponding bar code information.
S5 ＇, output bar code information.
Further, the color filter in the embodiment shown in above-mentioned Fig. 1, Fig. 2 can be the color filter (hereinafter referred to as rgb filter) based on RGB color model.
Described rgb filter, its form presents with one or one group of R, G, B color component.Multiple wave bands in multiple rgb filter difference corresponding wavelength 430-790nm visible ray, each wave band represents with its centre wavelength or centre wavelength and R, G, B color component corresponding to contiguous wave band thereof, and this R, G, B color component i.e. a corresponding rgb filter.Such as, wavelength 430-790nm visible ray is divided into multiple wave band, wherein the centre wavelength of a wave band is 760nm, R, G, B color component corresponding to this centre wavelength is R226, G63, B25, the rgb filter including the software form of this R, G, B color component parameter then corresponds to this wave band, and this rgb filter can be used for the bar code image of filtration treatment fluorescence color in this wavelength band.
Usually, illuminated rear the presented wavelength of fluorescence of stealthy Ultraluminescence bar code is 430-790nm, institute after different multiple stealthy Ultraluminescence bar codes is illuminated presents wavelength of fluorescence can in 430-790nm in different-waveband, and the quantity of wave band is determined according to the precision divided.Therefore, to should different-waveband in 430-790nm, there is the rgb filter of different corresponding R, G, B color components, such as, 430-790nm is divided into 100 wave bands, so then have 100 rgb filters and this 100 wave bands corresponding.Namely predetermined rgb filter is selected to determine from all rgb filters, and the wave band that multiple predetermined rgb filter is corresponding can be continuous print, also can be discrete.In step S2 and step S2 ＇, the bar code image gathered is to be sent in rgb filter based on the color digital image of RGB color model, to carry out filtering process, corresponding R, G, B color component should be had based on the digital picture of RGB color model, therefore there is corresponding wave band; Representated by R, G, B color component of the wave band representated by R, G, B color component in predetermined rgb filter and bar code image, wave band is consistent, after this predetermined rgb filter carries out filtering process to this bar code image, the gray-value image then successfully decoded in subsequent step generated, obtains corresponding bar code information.
In step S2 and step S2 ＇, the collection of bar code image realizes by image acquisition device; Image acquisition device can include but not limited to cmos image sensor or ccd image sensor.The exportable image data format based on different color model of different imageing sensors, the color conversion algorithm between different color model can be integrated in software filter.
Color filter in embodiment shown in above-mentioned Fig. 1, Fig. 2 also can be the color filter (hereinafter referred to as HSI wave filter) based on HSI color model.Described HSI wave filter, its form presents with the H of one or one group color (tone), S (saturation degree), I (intensity) component.In step s 2, the bar code image coloured image in an rgb format of collection is sent in software filter, for the process of HSI filter filtering; Therefore, before the process of HSI filter filtering, the color digital image color digital image based on RGB color model being converted to HSI form is also comprised.This switch process can complete in software filter, or completes before bar code image arrives software filter.
Multiple sector regions in the multiple HSI wave filter corresponding colour wheel of difference (or colour disk), the color component in each HSI wave filter each sector region corresponding.Each sector region all has corresponding angle, and the quantity of sector region is determined according to the precision divided, the quantity of the corresponding sector region of quantity of HSI wave filter; And two often adjacent sector regions can overlap, thus color component corresponding to often adjacent two HSI wave filters of correspondence also can overlap.Such as, as shown in Figure 3, colour wheel is divided with the sector region of 60 °, adjacent two sector regions have the overlap in 10 ° of regions, thus colour wheel can be divided into 36 sector regions, wherein each a sector region i.e. corresponding HSI wave filter, therefore HSI wave filter is used for the bar code image of filtration treatment reflection colour in corresponding sector region.The multiple sector regions sequentially carrying out multiple HSI wave filters of filtering process corresponding can distribute counterclockwise or clockwise along colour wheel on colour wheel.
One or more predetermined HSI wave filter is selected to determine from multiple HSI wave filter, and multiple sector regions that multiple predetermined HSI wave filter is corresponding are continuous print or discrete in the colour wheel.H, the S of H, S in predetermined HSI wave filter, I component and bar code image, I component are consistent, after this predetermined HSI wave filter carries out filtering process to this bar code image, the gray-value image successfully decoded in subsequent step generated, obtains corresponding bar code information.
Understandably, the color filter in the embodiment shown in above-mentioned Fig. 1, Fig. 2 also can be the color filter based on HSV color model, the color filter based on HSL color model, based on the color filter of CMY color model or the color filter based on CMYK color model.Wherein, based on the color filter (H tone, S saturation degree, V brightness) of HSV color model be same as HSI wave filter based on color filter (H tone, S saturation degree, the L lightness) principle of HSL color model; Color filter (C cyan, M magenta, Y are yellow) based on CMY color model and color filter (C cyan, M magenta, Y yellow, the K black) principle based on CMYK color model are same as rgb filter.
As shown in Figure 4, the recognizing apparatus of the Ultraluminescence bar code of one embodiment of the invention, comprises ultraviolet source 10, image acquisition device 20, filter unit 30, demoder 40 and output unit 50; Wherein, ultraviolet source 10 is for irradiating stealthy Ultraluminescence bar code and exciting as visible state by described bar code; Image acquisition device 20 is activated into the bar code image of visible state for gathering; Filter unit 30 is for receiving the bar code image of image acquisition device collection and adopting predetermined color filter that bar code image is carried out to filtering process, generates gray-value image; Demoder 40 is for carrying out decoding process to obtain corresponding bar code information to gray-value image; Bar code information exports by output unit 50.
Wherein, image acquisition device 20 can include but not limited to cmos image sensor or ccd image sensor; Wherein, cmos image sensor is the color sensitive chip adopting CMOS (ComplementaryMetalOxideSemiconductor, complementary metal oxide semiconductor (CMOS)) technique to make.Current common cmos image sensor, has three kinds of basic color: R (red), G (green), B (indigo plant).Each pixel can only obtain a kind of information of color component.General output be Bel (Bayer) template CFA (ColorFilterArray) image, the basic module of this template is 2x2 pixel: cornerwise two points are all G components; Another cornerwise two points one are R component, and one is B component.When the color component process carrying out image, according to the color component of each pixel surrounding pixel point, R, G, B component of this pixel can be calculated.The bar code image of collection is all converted to the color digital image based on RGB color model by this image acquisition device 20, then sends to filter unit to process.Accordingly, color filter carries out the bar code image of filtering process actual is the color digital image based on RGB color model.
Wherein, filter unit 30 comprises one or more color filter; Predetermined color filter is selected to determine from multiple color filter.Predetermined color filter is one or more, and the stealthy Ultraluminescence bar code that the mode determined mainly carries out distinguishing as required selects corresponding color filter.The quantity of predetermined color filter can need to carry out selection according to practical application and determine; Quantity is unsuitable too many, and then operation is many, consuming time too much, and affect decoding effect, quantity is as can be less than 20.
Filter unit 30 is software filter.Color filter can be the color filter based on RGB color model, the color filter based on HSI color model, the color filter based on HSV color model, the color filter based on HSL color model, based on the color filter of CMY color model or the color filter etc. based on CMYK color model.The described color filter based on RGB color model (hereinafter referred to as rgb filter), its form presents with one or one group of R, G, B color component; Multiple wave bands in multiple rgb filter difference corresponding wavelength 430-790nm visible ray, each wave band represents with its centre wavelength or centre wavelength and R, G, B color component corresponding to contiguous wave band thereof, and this R, G, B color component i.e. a corresponding rgb filter.The described color filter based on HSI color model (hereinafter referred to as HSI wave filter), its form presents with the H of one or one group color (tone), S (saturation degree), I (intensity) component; Multiple sector regions in the multiple HSI wave filter corresponding colour wheel of difference (or colour disk), the color component in each HSI wave filter each sector region corresponding.Each sector region all has corresponding angle, and the quantity of sector region is determined according to the precision divided, the quantity of the corresponding sector region of quantity of HSI wave filter; The described color filter based on HSV color model and be same as HSI wave filter based on the color filter principle of HSL color model; Color filter based on CMY color model and the color filter principle based on CMYK color model are same as rgb filter.This rgb filter and HSI wave filter specifically to can refer in above-mentioned reading method described in corresponding rgb filter and HSI wave filter, do not repeat them here.
Corresponding HSI wave filter, HSV wave filter or HSL wave filter, this recognizing apparatus also can comprise conversion module, for the color digital image based on RGB color model being converted to the color digital image based on HSI color model, HSV color model or HSL color model; This modular converter accessible site is in filter unit 30 or independent of filter unit 30.
Demoder 40 can comprise graphics processing unit and decoding unit; Graphics processing unit is used for carrying out module location to gray-value image, and extracts corresponding numerical matrix; Decoding unit is used for logarithm value matrix and carries out decoding process, to obtain bar code information.
Further, this recognizing apparatus also comprises selection unit 60, for using predetermined color filter corresponding for successfully decoded as preferred filter, wherein, in upper bar code reading process once, the preferential preferred filter that uses carries out filtering process to gathered bar code image.Described filter unit 30, demoder 40, output unit 50 and selection unit 60 all can be in the upper program performed of micro controller unit, microcontroller (MCU) or digital signal processor (DSP).
Preferred filter can be fixing, may also be dynamic.Such as, selection unit 60 by after first time recognition using corresponding for successfully decoded one predetermined color filter as preferred filter, if still can decoded success through the bar code image of this preferred filter process when second time recognition, then this preferred filter remains unchanged; If when second time recognition by unsuccessful for the decoding of the bar code image of this preferred filter process, and by successfully decoded after another predetermined color filter process, then selection unit 60 using this another predetermined color filter again as preferred filter.When distinguishing stealthy Ultraluminescence bar code, carry out filtering process by directly calling predetermined color filter, efficiency is high.After distinguishing decoding first, by selection unit 60 using predetermined color filter corresponding for this process as preferred filter, to carry out filtering process as first predetermined color filter to bar code image during recognition next time.
From the above, this recognizing apparatus, by the color filter of software form, can be distinguished multiple stealthy Ultraluminescence bar code, compared to the optically filtering sheet that traditional recognizing apparatus adopts, improves applicability and reduce use cost.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various change, combination and change.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within right of the present invention.
Claims (10)
1. a reading method for Ultraluminescence bar code, is characterized in that, comprises the following steps:
S1, excited as visible state by the stealthy Ultraluminescence bar code of ultraviolet source irradiation;
S2, gather and be activated into the bar code image of visible state;
S3, described bar code image carried out to filtering, decoding process, to obtain corresponding bar code information;
S4, export described bar code information;
Wherein, step S3 comprises:
S3.1, from multiple predetermined color filter select a color filter filtering process is carried out to described bar code image, generate gray-value image;
S3.2, described gray-value image carried out to decoding process, if successfully decoded obtains corresponding bar code information, perform step S4; If unsuccessful, return step S3.1.
2. the reading method of Ultraluminescence bar code according to claim 1, is characterized in that, in described step S3.2, works as successfully decoded, then using color filter corresponding for this successfully decoded as preferred filter; In upper bar code reading process once, the described preferred filter of preferential use carries out filtering process to gathered bar code image.
3. the reading method of Ultraluminescence bar code according to claim 1, is characterized in that, this reading method also comprised S0, determines predetermined color filter before described step S1; Described step S0 comprises:
S0.1, with ultraviolet source irradiation for determining the stealthy Ultraluminescence bar code of predetermined color filter and being excited as visible state;
S0.2, gather and be activated into the bar code image of visible state;
S0.3, from multiple color filter, select a color filter to carry out filtering process to gathered bar code image by pre-defined rule, generate gray-value image;
S0.4, described gray-value image carried out to decoding process, to obtain corresponding bar code information; If successfully decoded, using color filter corresponding for successfully decoded as predetermined color filter; If unsuccessful, return step S0.3.
4. the reading method of Ultraluminescence bar code according to claim 3, it is characterized in that, repeating said steps S0.1-S0.4, respectively to multiple for determining that the stealthy Ultraluminescence bar code of predetermined color filter is distinguished, to obtain multiple predetermined color filter.
5. the reading method of the Ultraluminescence bar code according to any one of claim 1-4, it is characterized in that, in described step S3.1, described color filter be the color filter based on RGB color model, the color filter based on HSI color model, the color filter based on HSV color model, the color filter based on HSL color model, based on the color filter of CMY color model or the color filter based on CMYK color model.
6. a reading method for Ultraluminescence bar code, is characterized in that, comprises the following steps:
S1 ＇, excited as visible state by the stealthy Ultraluminescence bar code of ultraviolet source irradiation;
S2 ＇, gather and be activated into the bar code image of visible state;
S3 ＇, use a predetermined color filter to carry out filtering process to described bar code image, generate gray-value image;
S4 ＇, described gray-value image carried out to decoding process, obtain corresponding bar code information;
S5 ＇, export described bar code information.
7. a recognizing apparatus for Ultraluminescence bar code, is characterized in that, comprising:
For irradiating stealthy Ultraluminescence bar code and described bar code being excited the ultraviolet source into visible state;
For gathering the image acquisition device of the bar code image being activated into visible state;
For receiving the bar code image of described image acquisition device collection and adopting predetermined color filter that described bar code image is carried out to filtering process, generates the color filter unit of gray-value image;
For carrying out decoding process to described gray-value image with the demoder obtaining corresponding bar code information; And
Described bar code information is carried out the output unit exported.
8. the recognizing apparatus of Ultraluminescence bar code according to claim 7, is characterized in that, described filter unit comprises one or more color filter; Described predetermined color filter is selected to determine from multiple described color filter.
9. the recognizing apparatus of Ultraluminescence bar code according to claim 7, is characterized in that, this recognizing apparatus also comprises:
Using the selection unit of predetermined color filter corresponding for successfully decoded as preferred filter, wherein, in upper bar code reading process once, the described preferred filter of preferential use carries out filtering process to gathered bar code image.
10. the recognizing apparatus of the Ultraluminescence bar code according to any one of claim 7-9, it is characterized in that, described color filter be the color filter based on RGB color model, the color filter based on HSI color model, the color filter based on HSV color model, the color filter based on HSL color model, based on the color filter of CMY color model or the color filter based on CMYK color model.
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