CN105373789A - Cigarette invisible sprayed code integrity detection method - Google Patents
Cigarette invisible sprayed code integrity detection method Download PDFInfo
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- CN105373789A CN105373789A CN201510652089.4A CN201510652089A CN105373789A CN 105373789 A CN105373789 A CN 105373789A CN 201510652089 A CN201510652089 A CN 201510652089A CN 105373789 A CN105373789 A CN 105373789A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V30/00—Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
- G06V30/10—Character recognition
- G06V30/22—Character recognition characterised by the type of writing
- G06V30/224—Character recognition characterised by the type of writing of printed characters having additional code marks or containing code marks
- G06V30/2253—Recognition of characters printed with magnetic ink
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
- G06T7/0004—Industrial image inspection
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30168—Image quality inspection
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Abstract
The invention discloses a cigarette invisible sprayed code integrity detection method. The detection method is completed based on an ultraviolet light source, an industrial camera and a computer and comprises the steps that: (1) the industrial camera collects a sprayed code image under the assistance of the ultraviolet light source and a blue band-pass optical filter and transmits the sprayed code image to the computer; (2) the computer carries out double-threshold segmentation on the image by means of blue and red components of an RGB color space and extracts sprayed code characters; (3) horizontal projection is carried out on a character image after the segmentation, and edge retrieval is carried out on a horizontal projection curve so as to determine the positions of the sprayed code characters in a longitudinal coordinate; and (4) vertical projection is carried out on the positioned sprayed code areas, edge retrieval is carried out on a vertical projection curve, characteristic values such as a sprayed code character string length and widths of fracture gaps among the characters, and the missing of sprayed codes is determined by means of characteristic value multi-judgment. The method has the advantages that the high-quality sprayed code image can be collected, the difficulty of subsequent image processing is lowered, the detection precision is relatively high, and the quality of cigarette sprayed codes is ensured.
Description
Technical field
The present invention relates to the stealthy coding integrality detection method of a kind of cigarette.
Background technology
In order to need with brand image false proof, domestic tobacco company is more and more inclined to stealthy code spraying technology, Cai with only profiling under ultraviolet light auxiliary irradiation specialty inks by information spray printings such as cigarette dates of manufacture on cigarette transparent packaging paper.On the cigarette production line employing code spraying technology, may there is not ink-jet phenomenon in ink jet numbering machine, causes the defects such as coding disappearance appear in cigarette transparent packaging material.Current each cigarette factory owner will rely on the method for artificial sampling observation to ensure coding quality, has not only added human cost but also can not ensure the quality of all cigarette, may cause immeasurable impact to the image of cigarette enterprise.
For ensureing quality cigarette, the coding pick-up unit based on colour code sensing principle has been installed by part producer, but this pick-up unit man-machine interaction is poor, and accuracy of detection is low, cannot realize the effective detection to cigarette coding.
Summary of the invention
In order to detect the stealthy coding disappearance problem that may occur in parcel and carton box cigarette packaging process, ensureing quality cigarette, the invention provides the stealthy coding integrality detection method of a kind of cigarette based on machine vision technique.The present invention adopts following technical scheme to achieve these goals:
The stealthy coding integrality detection method of a kind of cigarette, the stealthy coding integrality detection method of described cigarette relies on ultraviolet source, industrial camera and computing machine to complete, and detecting step is as follows:
(1) the stealthy coding of ultraviolet source auxiliary irradiation, industrial camera gathers coding image and is sent to computing machine;
(2) first computing machine carries out Double Thresholding Segmentation by the blueness of RGB color space, red component to image and extracts coding character;
(3) then horizontal projection is carried out to the character picture after segmentation, horizontal projection curve carries out edge retrieval to locate the position of coding character in longitudinal coordinate;
(4) finally vertical projection is carried out to the coding region of location, retrieve at vertical projection curve coboundary and calculate coding string length and character interruption splits the eigenwerts such as gap width, determine whether there is coding lack by the multiple judgement of eigenwert.
Described ultraviolet source is the ultraviolet source of 365nm wavelength, the stealthy coding of ultraviolet source auxiliary irradiation of 365nm wavelength, makes code-spraying printing ink be blue under ultraviolet light and forms sharp contrast with background area;
Adopt two becomes the ultraviolet source at 30 degree of angles to irradiate from coding both sides with level simultaneously.
Described industrial camera is installed on directly over coding, and increases the blue ribbon pass filter for removing the interference of other light before camera lens.
Blueness, the red component of the middle RGB color space of described step (2) carry out Double Thresholding Segmentation to image, adopt following formula:
Wherein, image for the purpose of g (x, y), f (x, y) is source images, T
b, T
rbe respectively blue component threshold value and red component threshold value.
In described step (3), with the row pixel average gray value of image for feature carries out horizontal direction projection to coding image, obtain horizontal projection curve, then with curve two-end-point for starting point is respectively toward the trip point position (i.e. rising edge) that other end point search first is stable, correspondence obtains the top and bottom position of coding character, location coding character, meets following formula and stops search when wherein searching for trip point in drop shadow curve:
A(x+i)≥A(x)+dis，{i|i＝1，…，4}
A (x) is the projection value of image xth row, and dis is the projection value difference being set as rising edge.
In described step (4), carry out vertical direction projection with the row pixel average gray value of image for the coding image of feature to location, obtain vertical projection curve;
Wherein string length value calculating method is, with vertical projection curve two-end-point for starting point is respectively toward the trip point position (rising edge) that other end point search first is stable, distance between two trip points is string length, when the absolute difference of the string length value calculated and standard value is greater than the threshold value of setting, then think that coding end has more character or lacks character;
Otherwise, the part on traversal vertical projection curve between two trip points (rising edge), search meets the trip point (negative edge) of following formula:
A(x-i)≥A(x)+dis，{i|i＝1，…，4}
After searching the trip point (negative edge) meeting above-mentioned condition, record this position and continue to search for the trip point (i.e. rising edge) closed on, distance values between calculating at 2, when the distance values calculated is greater than the threshold value of setting, then thinks that this place's character of coding lacks.
The Advantageous Effects adopting as above technical scheme to obtain is:
The present invention after understanding code-spraying printing ink characteristic and optical filter feature in depth, innovation propose a kind of novel cigarette stealthy coding integrity detection mode, detected by the integrality of method to coding character such as special image acquisition mode and projective transformations.The method can collect the coding image of high-quality, greatly reduces the difficulty of successive image process, has higher accuracy of detection, can ensure the quality of cigarette coding, have application space widely.
Accompanying drawing explanation
Fig. 1 is cigarette stealthy coding integrity detection schematic diagram.
Fig. 2 is the complete stealthy coding drop shadow curve figure of cigarette.
Fig. 3 is the stealthy coding drop shadow curve figure of cigarette of disappearance.
Embodiment
1 to 3 pair of the specific embodiment of the present invention is described further with reference to the accompanying drawings:
For the stealthy coding disappearance of the cigarette of the stealthy coding 031420599193 of complete cigarette, disappearance for 0314299193.
Fig. 1 is tested tobacco bale 1 (parcel or carton box cigarette) of the present invention, ultraviolet source 2, optical filter 3 and industrial camera 4 relative mounting positions, two are adopted to become the 365nm length ultraviolet light source at 30 degree of angles to throw light on from coding both sides to stealthy coding with level, make coding area light according to all and avoid reflectively affecting image quality, use simultaneously blue ribbon pass filter be in order to filtering blueness outside light, reduce interference.
Industrial camera with or without gather during blue ribbon pass filter coding image effect contrast, after use blue ribbon pass filter, the blue light that only specialty inks produces enters camera by optical filter, and other light are isolated by optical filter, therefore the background of figure is simple, can facilitate the process such as successive character segmentation.
The stealthy coding integrality detection method of a kind of cigarette, the stealthy coding integrality detection method of described cigarette relies on ultraviolet source, industrial camera and computing machine to complete, and detecting step is as follows:
(1) the stealthy coding of ultraviolet source auxiliary irradiation, industrial camera gathers coding image and is sent to computing machine;
(2) first computing machine carries out Double Thresholding Segmentation by the blueness of RGB color space, red component to image and extracts coding character;
(3) then horizontal projection is carried out to the character picture after segmentation, horizontal projection curve carries out edge retrieval to locate the position of coding character in longitudinal coordinate;
(4) finally vertical projection is carried out to the coding region of location, retrieve at vertical projection curve coboundary and calculate coding string length and character interruption splits the eigenwerts such as gap width, determine whether there is coding lack by the multiple judgement of eigenwert.
Blueness, the red component of the middle RGB color space of described step (2) carry out Double Thresholding Segmentation to image, adopt following formula:
Wherein, image for the purpose of g (x, y), f (x, y) is source images, T
b, T
rbe respectively blue component threshold value and red component threshold value.
In described step (3), for feature, horizontal direction projection is carried out to image with the row pixel average gray value of image, obtain curve A in Fig. 2.With horizontal projection curve two-end-point for starting point is respectively toward the trip point position (rising edge) that other end point search first is stable, correspondence obtains the top and bottom position of coding character, location coding character, meets following formula and stops search when wherein searching for trip point in drop shadow curve:
A(x+i)≥A(x)+dis，{i|i＝1，…，4}
A (x) is the projection value of image xth row, and dis is the projection value difference being set as rising edge.
In described step (4), carry out vertical direction projection with the row pixel average gray value of image for the coding image of feature to location, obtain vertical projection curve, i.e. curve B in Fig. 2;
Wherein string length value calculating method is, with curve B two-end-point for starting point is respectively toward the trip point position (rising edge) that other end point search first is stable, distance between two trip points is string length, when the absolute difference of the string length value calculated and standard value is greater than the threshold value of setting, then think that coding end has more character or lacks character;
Otherwise, the part in traversal curve B between two trip points (rising edge), search meets the trip point (negative edge) of following formula:
A(x-i)≥A(x)+dis，{i|i＝1，…，4}
The stealthy coding disappearance of cigarette is 0314299193, and its vertical projection curve as shown in Figure 3, according to above-mentioned theory calculating character string length value and middle fracture width value in drop shadow curve, finally judges that this coding is defect coding.
Certainly; more than illustrate and be only preferred embodiment of the present invention; the present invention is not limited to enumerate above-described embodiment; should be noted that; any those of ordinary skill in the art are under the guidance of this instructions; made all equivalently to substitute, obvious form of distortion, within the essential scope all dropping on this instructions, protection of the present invention ought to be subject to.
Claims (6)
1. the stealthy coding integrality detection method of cigarette, is characterized in that, the stealthy coding integrality detection method of described cigarette relies on ultraviolet source, industrial camera and computing machine to complete, and detecting step is as follows:
(1) the stealthy coding of ultraviolet source auxiliary irradiation, industrial camera gathers coding image and is sent to computing machine;
(2) first computing machine carries out Double Thresholding Segmentation by the blueness of RGB color space, red component to image and extracts coding character;
(3) then horizontal projection is carried out to the character picture after segmentation, horizontal projection curve carries out edge retrieval to locate the position of coding character in longitudinal coordinate;
(4) finally vertical projection is carried out to the coding region of location, retrieve at vertical projection curve coboundary and calculate coding string length and character interruption splits the eigenwerts such as gap width, determine whether there is coding lack by the multiple judgement of eigenwert.
2. the stealthy coding integrality detection method of a kind of cigarette according to claim 1, it is characterized in that, described ultraviolet source is the ultraviolet source of 365nm wavelength, the stealthy coding of ultraviolet source auxiliary irradiation of 365nm wavelength, makes code-spraying printing ink be blue under ultraviolet light and forms sharp contrast with background area;
Adopt two becomes the ultraviolet source at 30 degree of angles to irradiate from coding both sides with level simultaneously.
3. the stealthy coding integrality detection method of a kind of cigarette according to claim 1, it is characterized in that, described industrial camera is installed on directly over coding, and increases the blue ribbon pass filter for removing the interference of other light before camera lens.
4. the stealthy coding integrality detection method of a kind of cigarette according to claim 1, is characterized in that, blueness, the red component of the middle RGB color space of described step (2) carry out Double Thresholding Segmentation to image, adopt following formula:
Wherein, image for the purpose of g (x, y), f (x, y) is source images, T
b, T
rbe respectively blue component threshold value and red component threshold value.
5. the stealthy coding integrality detection method of a kind of cigarette according to claim 1, it is characterized in that, in described step (3), with the row pixel average gray value of image for feature carries out horizontal direction projection to coding image, obtain horizontal projection curve, then with curve two-end-point for starting point is respectively toward the trip point position (rising edge) that other end point search first is stable, correspondence obtains the top and bottom position of coding character, location coding character, meets following formula and stops search when wherein searching for trip point in drop shadow curve:
A(x+i)≥A(x)+dis，{i|i＝1，…，4}
A (x) is the projection value of image xth row, and dis is the projection value difference being set as rising edge.
6. the stealthy coding integrality detection method of a kind of cigarette according to claim 1, it is characterized in that, in described step (4), carry out vertical direction projection with the row pixel average gray value of image for the coding image of feature to location, obtain vertical projection curve;
Wherein string length value calculating method is, with vertical projection curve two-end-point for starting point is respectively toward the trip point position (rising edge) that other end point search first is stable, distance between two trip points is string length, when the absolute difference of the string length value calculated and standard value is greater than the threshold value of setting, then think that coding end has more character or lacks character;
Otherwise, the part on traversal vertical projection curve between two trip points (rising edge), search meets the trip point (negative edge) of following formula:
A(x-i)≥A(x)+dis，{i|i＝1，…，4}
After searching the trip point (negative edge) meeting above-mentioned condition, record this position and continue to search for the trip point (rising edge) closed on, distance values between calculating at 2, when the distance values calculated is greater than the threshold value of setting, then thinks that this place's character of coding lacks.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106056617A (en) * | 2016-05-31 | 2016-10-26 | 中国电子科技集团公司第四十研究所 | Cigarette carton sealing machine hot melt adhesive detection method |
| CN106650537A (en) * | 2016-12-21 | 2017-05-10 | 贵州省烟草公司贵阳市公司 | Identification reading inputting instrument of tobacco carton 32-bit laser code |
| CN109631763A (en) * | 2019-02-01 | 2019-04-16 | 东莞中科蓝海智能视觉科技有限公司 | Irregular part detects localization method |
| CN114654911A (en) * | 2022-04-07 | 2022-06-24 | 常德金鹏印务有限公司 | Method and device for automatically jet-printing two-dimensional code |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002183729A (en) * | 2000-10-20 | 2002-06-28 | Eastman Kodak Co | Blond-hair-pixel removing method in image skin-color detection |
| CN102184378A (en) * | 2011-04-27 | 2011-09-14 | 茂名职业技术学院 | Method for cutting portable data file (PDF) 417 standard two-dimensional bar code image |
| CN204399579U (en) * | 2014-12-31 | 2015-06-17 | 中国电子科技集团公司第四十一研究所 | For the industrial camera module that the stealthy coding of carton box cigarette detects |
-
2015
- 2015-10-08 CN CN201510652089.4A patent/CN105373789A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002183729A (en) * | 2000-10-20 | 2002-06-28 | Eastman Kodak Co | Blond-hair-pixel removing method in image skin-color detection |
| CN102184378A (en) * | 2011-04-27 | 2011-09-14 | 茂名职业技术学院 | Method for cutting portable data file (PDF) 417 standard two-dimensional bar code image |
| CN204399579U (en) * | 2014-12-31 | 2015-06-17 | 中国电子科技集团公司第四十一研究所 | For the industrial camera module that the stealthy coding of carton box cigarette detects |
Non-Patent Citations (1)
| Title |
|---|
| 徐勇等: "基于BP神经网络的烟包喷码字符智能识别系统研究", 《万方数据库》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106056617A (en) * | 2016-05-31 | 2016-10-26 | 中国电子科技集团公司第四十研究所 | Cigarette carton sealing machine hot melt adhesive detection method |
| CN106650537A (en) * | 2016-12-21 | 2017-05-10 | 贵州省烟草公司贵阳市公司 | Identification reading inputting instrument of tobacco carton 32-bit laser code |
| CN109631763A (en) * | 2019-02-01 | 2019-04-16 | 东莞中科蓝海智能视觉科技有限公司 | Irregular part detects localization method |
| CN114654911A (en) * | 2022-04-07 | 2022-06-24 | 常德金鹏印务有限公司 | Method and device for automatically jet-printing two-dimensional code |
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