CN103245307B - A kind of detection method being suitable for mensuration cigarette tipping paper stamping area - Google Patents
A kind of detection method being suitable for mensuration cigarette tipping paper stamping area Download PDFInfo
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- CN103245307B CN103245307B CN201310191979.0A CN201310191979A CN103245307B CN 103245307 B CN103245307 B CN 103245307B CN 201310191979 A CN201310191979 A CN 201310191979A CN 103245307 B CN103245307 B CN 103245307B
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Abstract
A kind of detection method being suitable for mensuration cigarette tipping paper stamping area, it is characterized in that: by adopting two light-source illuminating system, CCD imaging system and Computer Image Processing analysis mode, thermoprint region is utilized to have properties of specular reflection, but not thermoprint region has irreflexive characteristic, by thermoprint region and non-thermoprint region segmentation out, and then calculate thermoprint region area and account for the number percent of the tipping paper total area, concrete steps are (1) sample preparation, (2) image acquisition and processing analysis, (3) result of calculation.The inventive method is by carrying out brand-new design to sample preparation, image acquisition and graphical analysis, compared with prior art there is following features and advantage: adopt two light-source illuminating system, thermoprint region is utilized to have properties of specular reflection, and the irreflexive characteristic in background area, accurately and effectively thermoprint region is extracted from background.The robotization completely of whole process implementation, effectively saves analysis time, significantly reduces the impact of human factor.
Description
Technical field
The present invention relates to a kind of detection method being suitable for measuring cigarette tipping paper stamping area, have employed a kind of NEW TYPE OF COMPOSITE illuminator specifically, using computer vision as the detection method of the printed apcksging material stamping area ratio of image procossing mode.
Background technology
Thermoprint (or transfer) is commonly called as gold stamping, is that one utilizes hot pressing principle of transfer, the aluminium lamination in anodized aluminium is transferred to stock on the surface, to form the printing decoration technique of particulate metal effect.Thermoprint (or transfer) technique makes cigarette tipping paper more attractive in appearance magnificent, but its comparison of ingredients is complicated, may have the pollution of the poisonous and harmful substances such as heavy metal, phthalate, benzene homologues and 2,4-DNP.And the mouth that cigarette tipping paper is cigarette paper touches part, the objectionable constituent contained in thermoprint material probably enter human body by sucking cigarette, have an impact to the health of consumer.Along with smoking and the healthy concern being more and more subject to various circles of society, State Tobacco Monopoly Bureau has carried out specification to the use of thermoprint in cigarette products, require that the actual compound of cigarette tipping paper (containing transfer, thermoprint) area must not exceed 10% of tipping paper area, and compound (containing transfer, thermoprint) technique in nearly lip end 20 mm, must not be adopted.
The thermoprint of cigarette tipping paper often has the complicated feature of thermoprint out-of-shape, thermoprint decorative pattern, and this brings certain difficulty to the accurate and effective calculating of stamping area in tipping paper.2012, the people such as Han Yunhui use Photoshop software and ImageJ software to calculate stamping area in tipping paper, and inquired into the accuracy of two kinds of methods, repeatability and the scope of application, finally think that Photoshop method calculates more accurate, the scope of application is wider.Photoshop method mainly utilizes magic excellent function to carry out choosing, when the thermoprint figure of some complexity, because thermoprint decorative pattern is complicated, thermoprint color and background comparatively close, Photoshop effectively can not identify edge, causes certain analytical error and the increase of analysis time.In addition, Photoshop method need by image acquisition and graphical analysis separated, be difficult to the on-line analysis realizing image, in analytic process, the introducing of a large amount of manual operation also affects to the accuracy analyzed, and these are all that cigarette tipping paper stamping area calculates urgent problem in research.
In sum, in order to make up the existing cigarette deficiency of switching through paper stamping area ratio computing method, reduce the security risk of cigarette products further simultaneously, the health benefit of abundant guarantee consumer, be badly in need of setting up a kind of can effectively, the computing method of accurate, on-line determination cigarette tipping paper stamping area, for daily Inspection and Supervision work provides technical support.
Summary of the invention
The object of the invention is to set up a kind of can effectively, accurately, the computing method of on-line determination cigarette tipping paper stamping area, effectively can reduce the impact of human factor in the calculating of cigarette tipping paper stamping area, realize the on-line analysis of cigarette tipping paper stamping area.
The object of the invention is to be achieved through the following technical solutions:
A kind of detection method being suitable for mensuration cigarette tipping paper stamping area, by adopting two light-source illuminating system, CCD imaging system and Computer Image Processing analysis mode, thermoprint region is utilized to have properties of specular reflection, but not thermoprint region has irreflexive characteristic, by thermoprint region and non-thermoprint region segmentation out, and then calculate thermoprint region area and account for the number percent of the tipping paper total area, concrete steps are (1) sample preparation, (2) image acquisition and processing analysis, (3) result of calculation.
Described sample preparation refers at certain temperature and relative humidity, tipping paper sample cuts in continuous print thermoprint region the paper fragment of 50 mm, then Measurement accuracy tipping paper width and from midline position, tipping paper is cut out as two parts, take out a part as test specimen.The test specimen prepared is fixed on objective table, ensures that sample is straight, do not occur curling.
The temperature and humidity of sample preparation is respectively: 20 ± 5 DEG C and (65 ± 5) %, and its effect ensures that sampling is consistent, and under such epidemic disaster condition, outturn keeps good ductility, can not occur curling.
The tipping paper length cut in this step is 50 mm, its effect ensures that image acquisition region covers a complete filter-rod periphery, graphical analysis be can the complete hot stamping unit of Obtaining Accurate one (the thermoprint region on tipping paper is generally continuous, and the length used on cigarette is certain, suitable image acquisition region is selected to be the basis of graphical analysis.The circumference of current cigarette filter is generally between 15.0 ~ 30.0 mm, more common filter tip circumference is between 24.0 ~ 25.0 mm, and mouthful length of taking of tipping paper is generally 0.1 mm, thus 50 mm cut length under can cover a complete filter-rod periphery).
Described image acquisition and processing analysis has different reflection potential from non-thermoprint region to light according to thermoprint region, adopts charge coupled cell (CCD) to complete the collection of image, comprise the extraction in (1) thermoprint region; (2) extraction of single hot stamping unit.
The extraction in thermoprint region: thermoprint region has properties of specular reflection, but not thermoprint region is diffusing characteristic diffuser, under the illuminator of two light source, a set of light source is for strengthening the properties of specular reflection in thermoprint region, and another set of light source weakens this characteristic; Non-thermoprint region does not have properties of specular reflection, therefore shows similar outward appearance under two light sources, and thermoprint region shows under two kinds of light source effects differs greatly; Utilize this species diversity, just tentatively can realize the extraction in thermoprint region; Through the necessary pre-service such as denoising, binaryzation after obtaining preliminary images, by two width image subtractions, can remove or reduce the gray-scale value in non-thermoprint region, thermoprint region is enhanced in the picture, realize the accurate extraction in thermoprint region;
The extraction of single hot stamping unit: after obtaining the binary image in thermoprint region, for the single hot stamping unit in recognition image, each shape in image need be mated, interval between two graphic elements that the match is successful is exactly a hot stamping unit cycle, just may be used for follow-up graphical analysis after hot stamping unit is accurately identified.
Two light-source systems used during image acquisition, comprise top light source, side light source, described top light source is made up of coaxial light source and dome light source, light source after combination can provide the illuminating ray of little incident angle for visual field, include the on-axis rays that firing angle is zero, for strengthening the properties of specular reflection in thermoprint region, described side light source is made up of two linear light sorurces being positioned at both sides, visual field, for visual field provides the large incident angle illuminating ray of nearly 90 degree for weakening the properties of specular reflection in thermoprint region.
Employ the necessary pre-service such as denoising, binaryzation during image acquisition, its effect is that thermoprint region is extracted preferably from background.
The method that have employed morphological image when extracting single hot stamping unit is mated each shape in image, interval between two graphic elements that the match is successful is exactly a hot stamping unit cycle, its effect avoids manually determining the hot stamping unit cycle, ensures the accuracy that hot stamping unit is extracted.
In this step, introduce gauge and calibrate the image gathered, the diameter of gauge is 7500 μm.First CCD gathers the image of gauge, then carries out dimension correction according to the image of the gauge obtained to whole visual field.(process corrected by gauge is known technology in industry, and also someone uses the coin of unitary or a jiao to polish as rectification standard etc.)
In the present invention, calculate the total area of cigarette tipping paper thermoprint region area and cigarette tipping paper selection area respectively, namely obtain stamping area ratio of tipping paper used for tobacco with cigarette tipping paper thermoprint region area divided by the total area of cigarette tipping paper selection area.
Result of calculation is calculated by following formula the calculating of cigarette tipping paper thermoprint number percent:
In formula:
The stamping area number percent of R=cigarette tipping paper;
A
i=cigarette tipping paper thermoprint region area, unit is μm
2;
A
jthe total area of=cigarette tipping paper selection area, unit is μm
2.
The inventive method, by carrying out brand-new design to sample preparation, image acquisition and graphical analysis, compared with prior art has following features and advantage:
(1) the inventive method adopts two light-source illuminating system, utilizes thermoprint region to have properties of specular reflection, and the irreflexive characteristic in background area, accurately and effectively thermoprint region is extracted from background.
(2) the inventive method adopts the automatic mode extracting single hot stamping unit, and existing stamping area of comparing needs artificial cutting hot stamping unit more accurate in calculating, and can effectively reduce because the error of artifact introducing.
(3) the inventive method adopts the ccd image acquisition system being equipped with two lighting sources, by professional software Long-distance Control, the on-line analysis in thermoprint region can be realized, whole analytic process achieves robotization completely, effectively save analysis time, significantly reduce the impact of human factor.
Accompanying drawing explanation
Fig. 1 cigarette tipping paper stamping area measuring instrument complete machine schematic diagram
Label in Fig. 1: 1. pillar, 2. CCD camera, 3. camera lens, 4. coaxial light source, 5. dome light source, 6. array light source, 7. sample to be tested, 8. electromagnet, 9. support board, 10. compressing tablet, 11. lifting tables.
Fig. 2 is used for the standard round that picture size corrects.
Multi-light-source illumination system schematic diagram in Fig. 3 the present invention.
Label in Fig. 3: 3. camera lens, 4. coaxial light source, 4-1. semi-transparent semi-reflecting lens, 4-2. ground glass, 4-3. area array light source, 5. dome light source, 5-1. ring-type light source, 6. array light source, 7. pattern to be measured.
Fig. 4 cigarette tipping paper sampling schematic diagram.
Fig. 5 different images acquisition mode obtain image information, (a) 1200dpi resolution scanner obtain image information, (b) 5,000,000 pixel CCD obtain image information.
Fig. 6 mirror-reflection light illumination effect schematic diagram.
Fig. 7 non-mirror reflection light illumination effect schematic diagram.
Fig. 8 thermoprint extracted region flow process.
Fig. 9 thermoprint extracted region result schematic diagram.
Figure 10 periodicity extraction result schematic diagram.
Embodiment
The present invention is described further below in conjunction with accompanying drawing, but is not restriction the present invention.
as follows to the assay method of stamping area ratio of tipping paper used for tobacco:
1. instrument and software
High-precision CCD imaging system, is equipped with image pick-up card, and Image-forming instrument complete machine structure as shown in Figure 1; There is the image processing software of automatic image capture, segmentation, exposure adjustment; Graphics standard calibration circle, internal diameter
Φ7500 μm of (see figure 2)s; Industrial lens, 2.8 mm; Multi-light-source illumination system (see figure 3); Mechanical objective table; Be with graduated trimmer.
2. operating environment
Temperature: 20 ± 5 DEG C; Relative humidity: (65 ± 5) %
3. the artificial judgment in thermoprint region
During sampling, according to the hot stamping process of relevant enterprise, cigarette tipping paper is indicated thermoprint region, auxiliary judgment is carried out to the thermoprint region that follow-up graphical analysis Computer extracts automatically, ensure the accuracy of thermoprint extracted region.
4. sample preparation
Carry out under the operating environment of sample preparation defined in 2.Sample preparation quick and precisely, and should guarantee that sample is not contaminated.Each sample preparation three parallel samples.
Get a cigarette tipping paper, use paper knife to cut the tipping paper of 50 mm, the then width of Measurement accuracy tipping paper, from midline position, tipping paper is cut out as two parts (as Fig. 4 shows), take out a part as test specimen.
Repeat 2 above-mentioned steps, for preparation 3 test specimens.
The clean of instrument and equipment and operator's console should be ensured in whole sampling process, avoid the microslide of sample and preparation to be polluted.
5. determination step
The test specimen prepared is fixed on objective table, opens multi-light-source illumination system.
Open image capturing system and image processing software, adjustment objective table, makes the tipping paper sample prepared be within the visual field of CCD completely, regulates the industrial lens be arranged on above CCD, until tipping paper sample image is clear.
Under screening-mode, the less top light source of incident angle and the larger sidelight two kinds of lighting systems of incident angle are used to carry out image acquisition respectively to sample respectively.
Under image processing mode, thermoprint region is split from background, and carry out binary conversion treatment, by the hot stamping process information obtained during sampling, auxiliary judgment is carried out to the thermoprint region of extracting.
Under image processing mode, extract the single hot stamping unit on tipping paper sample, calculate the area in thermoprint region and the area of whole selection area respectively, and calculate number percent.
Repeat 5 above-mentioned steps, measure the thermoprint number percent of other two tipping paper samples, the extreme difference measured for three times controls 5%, otherwise rechecks.
6. calculate
The calculating of cigarette tipping paper thermoprint number percent calculates by following formula:
In formula:
The stamping area number percent of R=cigarette tipping paper;
A
i=cigarette tipping paper thermoprint region area, unit is μm
2;
A
jthe total area of=cigarette tipping paper selection area, unit is μm
2.
the determination of image acquisition mode
The tipping paper sample choosing certain cigarette brand is as tested object, and use scanner (Fig. 5 a) and CCD(Fig. 5 b) to carry out image acquisition respectively, test findings as shown in Figure 5.The thermoprint region blur in Fig. 5 a can be found by contrast, effective differentiation is difficult to background, and the image taking CCD to obtain in Fig. 5 b is because make use of the characteristic of thermoprint region mirror-reflection, thermoprint region is separated preferably from background, therefore selects the acquisition mode of CCD to obtain image information.
the selection of light source under ccd image acquisition mode
The acquisition of selection to sample image information of light source has a great impact, and the selection of Different Light can cause the extraction effect difference in thermoprint region huge, and the further quality of effect diagram picture and the accuracy of analysis.For the different light-reflecting property of thermoprint region from non-thermoprint region, devise the illuminator (as Fig. 3) of multiple light courcess combination.This system, two cover light sources are used alternatingly, a set of properties of specular reflection for strengthening thermoprint region, this characteristic of another set of reduction.Non-thermoprint region does not have properties of specular reflection, therefore shows similar outward appearance under two light sources, and thermoprint region shows under two kinds of light source effects differs greatly.Namely this method utilizes this difference, realizes the extraction in thermoprint region.
(1) mirror-reflection light source
For fully showing the properties of specular reflection in thermoprint region, devise the combined light source that coaxial light source combines with dome diffuse reflection light source (see Fig. 3).Coaxial light source is the little incident angle illuminating ray that the mirror-reflection in thermoprint region provides near optical axis, makes the light that the thermoprint region immediately below camera lens can be reflected from this light source enter camera lens.Due to thermoprint region surface, to exist in various degree bending, the reflection ray grasping the type region is flutterred for enabling camera lens, introduce dome diffuse reflection light source, this light source is based on the integral principle of light, make illuminating ray have the features such as luminous cross section is large, incident angle dynamic range is large, be applicable to the mirror reflection illuminating on bending thermoprint surface in most cases.
Under the effect of above-mentioned two kinds of light sources, the thermoprint region always light that can reflect from light source enters camera lens, thus obtains the tipping paper image of fully performance thermoprint region properties of specular reflection, and the thermoprint paper image of acquisition as shown in Figure 6.
(2) non-mirror reflection light source
For obtaining the image of thermoprint region when non-mirror reflection, devise the side light light source of large incident angle.This light source is made up of two linear light sorurces, with the incident angle of nearly 90 degree for visual field provides illumination, regulate brightness make the light intensity of visual field with use mirror-reflection light source time similar.The reflection ray of thermoprint region to light source is difficult to enter camera lens, so under the illumination of the type light source, the tipping paper image collected is without obvious mirror-reflection, and the thermoprint paper image using this light source to obtain as shown in Figure 7.
Multi-light-source illumination system auxiliary under, thermoprint region can extract by CCD preferably from background, and the existing thermoprint extracted region mode based on scanner and Photoshop is not because utilize the high reflective characteristic in thermoprint region, can only simply according to the color space of RGB to Image Segmentation Using, the difference of image in brightness can not be embodied, when thermoprint color and print color relatively time be then difficult to realize effective extraction.It is to be noted that the laser printing on tipping paper also can effectively be separated under multi-light-source illumination system.
iamge Segmentation
By twice imaging of multi-light-source illumination system, obtain mirror-reflection and the non-mirror reflection image in thermoprint region respectively, in two width images, the gray scale in thermoprint region has larger difference, but not thermoprint region is without obvious difference.Through the necessary pre-service such as denoising, gray processing, by two width image subtractions, can remove or reduce the gray-scale value in non-thermoprint region, thermoprint region is enhanced in the picture, its expression formula is as follows:
Be labeled as the pixel of 255 corresponding to the thermoprint region of tipping paper, be labeled as the pixel of 0 then corresponding to the background area of tipping paper.So just by setting image threshold, the thermoprint region that band is analyzed is extracted from background.
Adopt the process such as multi-light-source illumination system and necessary denoising, gray processing and binaryzation from the background of complexity, effectively can identify thermoprint region in cigarette tipping paper, but in order to ensure the accuracy analyzed, be necessary in conjunction with in typography to the setting in thermoprint region, to extraction result carry out auxiliary judgment.
the acquisition of single hot stamping unit
In graphical analysis, the selection in thermoprint region has important impact to analysis result, because the thermoprint region on tipping paper is all continuous and circulation, so only need carry out to hot stamping unit the stamping area ratio that graphical analysis just can obtain tipping paper.The acquisition of tipping paper stamping area computing method to a hot stamping unit based on Photoshop is the method adopting artificial cutting, and this easily brings unnecessary error, causes the inaccurate of analysis result.This method adopts the mode of computer picture recognition to realize the extraction in single thermoprint region.
Obtain the binary image in thermoprint region by extracting flow process in Fig. 8 after, be the single hot stamping unit in recognition image, need mate each shape in image, the interval between two graphic elements that the match is successful is exactly a hot stamping unit cycle.According to above-mentioned principle, the following hot stamping unit extracting method of this Project design, mainly comprises the content such as connected domain extraction, connected domain Shape Feature Extraction, connected domain coupling.It extracts result as shown in Figure 10.
Claims (4)
1. one kind is suitable for the detection method measuring cigarette tipping paper stamping area, it is characterized in that: by adopting two light-source illuminating system, CCD imaging system and Computer Image Processing analysis mode, thermoprint region is utilized to have properties of specular reflection, but not thermoprint region has irreflexive characteristic, by thermoprint region and non-thermoprint region segmentation out, and then calculate thermoprint region area and account for the number percent of the tipping paper total area, concrete steps are (1) sample preparation, (2) image acquisition and processing analysis, (3) result of calculation;
Described image acquisition and processing analysis has different reflection potential from non-thermoprint region to light according to thermoprint region, adopts charge coupled cell (CCD) to complete the collection of image, comprising:
1. the extraction in thermoprint region: thermoprint region has properties of specular reflection, but not thermoprint region is diffusing characteristic diffuser, under the illuminator of two light source, a set of light source is for strengthening the properties of specular reflection in thermoprint region, and another set of light source weakens this characteristic; Non-thermoprint region does not have properties of specular reflection, therefore shows similar outward appearance under two light sources, and thermoprint region shows under two kinds of light source effects differs greatly; Utilize this species diversity, just tentatively can realize the extraction in thermoprint region; Through necessary denoising, binaryzation pre-service after obtaining preliminary images, by two width image subtractions, can remove or reduce the gray-scale value in non-thermoprint region, thermoprint region is enhanced in the picture, realize the accurate extraction in thermoprint region;
2. the extraction of single hot stamping unit: after obtaining the binary image in thermoprint region, for the single hot stamping unit in recognition image, each shape in image need be mated, interval between two graphic elements that the match is successful is exactly a hot stamping unit cycle, just may be used for follow-up graphical analysis after hot stamping unit is accurately identified.
2. the detection method being suitable for mensuration cigarette tipping paper stamping area according to claim 1, it is characterized in that: described sample preparation refers at certain temperature and relative humidity, tipping paper sample cuts in continuous print thermoprint region the paper fragment of 50 mm, then Measurement accuracy tipping paper width and from midline position, tipping paper is cut out as two parts, take out a part as test specimen.
3. the detection method being suitable for mensuration cigarette tipping paper stamping area according to claim 1, it is characterized in that: two light-source systems used during image acquisition, comprise top light source, side light source, described top light source is made up of coaxial light source and dome light source, light source after combination can provide the illuminating ray of little incident angle for visual field, include the on-axis rays that firing angle is zero, for strengthening the properties of specular reflection in thermoprint region, described side light source is made up of two linear light sorurces being positioned at both sides, visual field, for visual field provides the large incident angle illuminating ray of nearly 90 degree for weakening the properties of specular reflection in thermoprint region.
4. the detection method being suitable for mensuration cigarette tipping paper stamping area according to claim 1, is characterized in that: result of calculation is calculated by following formula the calculating of cigarette tipping paper thermoprint number percent:
In formula:
The stamping area number percent of R=cigarette tipping paper;
a i =cigarette tipping paper thermoprint region area, unit is μm
2;
a j the total area of=cigarette tipping paper selection area, unit is μm
2.
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| US6765224B1 (en) * | 2000-12-29 | 2004-07-20 | Cognex Corporation | Machine vision method and system for the inspection of a material |
| CN101937563A (en) * | 2009-07-03 | 2011-01-05 | 深圳泰山在线科技有限公司 | Target detection method and equipment and image acquisition device thereof |
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