CN104376354A - Dot-matrix graphic, constructing method for dot-matrix graphic and method for identifying true dot-matrix graphic - Google Patents
Dot-matrix graphic, constructing method for dot-matrix graphic and method for identifying true dot-matrix graphic Download PDFInfo
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- CN104376354A CN104376354A CN201410648319.5A CN201410648319A CN104376354A CN 104376354 A CN104376354 A CN 104376354A CN 201410648319 A CN201410648319 A CN 201410648319A CN 104376354 A CN104376354 A CN 104376354A
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Abstract
The invention provides a dot-matrix graphic, a constructing method for the dot-matrix graphic and a method for identifying the true dot-matrix graphic. The dot-matrix graphic includes an ink dot set with a gray value feature, and gray values of ink dots a in the ink dot set can be adjusted and range from 0 to 255. The dot-matrix graphic has the advantages that a part of ink dots have the gray value feature; as is showed in the experiment, the ink dots with the gray value feature will become thicker or thinner after copying of a copying machine or after printing through a printer in prior to scanning of a scanner, and in other words, the gray value feature of the ink dots with the gray value feature is difficult to copy. In this way, the dot-matrix graphic is better in anti-fake effect.
Description
Technical field
The present invention relates to a kind of anti-counterfeiting mark field, particularly a kind of dot pattern, build the method for dot pattern and distinguish the method determined whether it is true or false.
Background technology
As shown in Figure 1, in existing false proof dot pattern 1, ink dot is generally the identical circular ink dot of shape or square ink dot formation.Its decode procedure is: the image obtaining this dot pattern, is drawn the coordinate of these ink dots by related algorithm, then is decoded into corresponding code value by these coordinate informations.The drawback of this way is: as long as with special scanning or copier, just can copy the ink dot in this dot pattern.The anti-counterfeit capability of visible common false proof dot pattern is limited.
Summary of the invention
For the weak point existed in the problems referred to above, the invention provides the better dot pattern of a kind of antifalse effect, build the method for dot pattern and distinguish the method determined whether it is true or false.
For achieving the above object, the invention provides a kind of dot pattern, it is characterized in that, comprise the ink dot group with grey value characteristics, the gray-scale value of the ink dot a in described ink dot group can regulate, and its gray-scale value is between 0 ~ 255.
Above-mentioned dot pattern, wherein, also comprises entirely black ink dot group, and the ink dot b in described entirely black ink dot group is full tusche point.
Above-mentioned dot pattern, wherein, described ink dot a and described ink dot b is arbitrary rule or irregular contour.
Above-mentioned dot pattern, wherein, described ink dot a and described ink dot b can adopt macroscopic coating, also can adopt the sightless coating of naked eyes.
The invention provides a kind of method distinguishing the dot pattern true and false, comprise typing with reference to dot pattern and the true and false two step greatly distinguishing dot pattern:
(1) typing is with reference to dot pattern:
S1, by the camera head of dot pattern can be caught, obtain the dot matrix image with reference to dot pattern;
The gray-scale value of S2, computing reference dot chart picture, if do not meet preset range, then according to the exposure parameter of the gray-scale value adjustment dot matrix image camera head obtained, and repeats step S1; Until the gray-scale value of the dot matrix image obtained meets preset range;
The centre coordinate of all ink dots in S3, computing reference dot chart picture and the gray-scale value of all described ink dot a;
S4, according to the centre coordinate with reference to all ink dots in dot matrix image, this dot matrix image is resolved to corresponding code value, and the gray-scale value of described ink dot a all in this code value and this dot matrix image is bound, be saved in database;
(2) true and false of dot pattern is distinguished:
S5, by the camera head of dot pattern can be caught, obtain the dot matrix image of dot pattern to be distinguished;
S6, calculate the gray-scale value of dot matrix image to be distinguished, if do not meet preset range, then according to the exposure parameter of the gray-scale value adjustment dot matrix image camera head obtained, and repeat step S5; Until the gray-scale value of the dot matrix image obtained meets preset range;
The centre coordinate of S7, all ink dots calculated in dot matrix image to be distinguished and the gray-scale value of all described ink dot a;
Dot matrix image is resolved to corresponding code value by the centre coordinate of all ink dots in S8, basis dot matrix image to be distinguished, according to this code value, Query Database, obtain the gray-scale value of all described ink dot a when typing and in the reference dot matrix image bound of this code value, contrast with the gray-scale value of described ink dot a all in dot matrix image to be distinguished, thus distinguish the true and false of current dot pattern;
S9, basis distinguish that result is extracted corresponding message file and reports.
Above-mentioned method, wherein, in step sl, comprises following sub-step:
S10, the camera head that can catch dot pattern send the spectrum of specific wavelength, are radiated on dot pattern, produce the spectrum picture of the specific wavelength of dot pattern;
S11, imaging device capture the spectrum picture of this specific wavelength by optical lens, and convert this image to digital signal by internal circuit, then these digital data transmission are processed to main control MCU.
Above-mentioned method, wherein, in step S4 and step S8, described database is the database in the machine, or the database in the webserver;
Above-mentioned method, wherein, in step s 5, comprises following sub-step:
S50, the camera head that can catch dot pattern send the spectrum of specific wavelength, are radiated on dot pattern, produce the spectrum picture of the specific wavelength of dot pattern;
S51, imaging device capture the spectrum picture of this specific wavelength by optical lens, and convert this image to digital signal by internal circuit, then these digital data transmission are processed to main control MCU.
Present invention also offers a kind of method building described dot pattern, there is the ink dot group of grey value characteristics, the gray-scale value of the ink dot a in described ink dot group can regulate, and its gray-scale value is between 0 ~ 255.
As a further improvement on the present invention, the method also comprises the full tusche point group of structure, and the gray-scale value of the ink dot b in described full tusche point group is less than the gray-scale value of described ink dot a; Or the gray-scale value of described ink dot b is greater than the gray-scale value of described ink dot a.
Compared with prior art, the present invention has the following advantages:
Dot pattern of the present invention, wherein part ink dot has grey value characteristics; Experiment proves, duplicate through duplicating machine, or after scanner scanning is printed by printer again, the ink dot with grey value characteristics always thickens or thin out, the grey value characteristics namely with the ink dot of grey value characteristics is difficult to be replicated, so dot pattern of the present invention has better antifalse effect.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing dot pattern;
Fig. 2 is the structural representation of first embodiment of the invention;
Fig. 3 is the structural representation of second embodiment of the invention;
Fig. 4 is the process flow diagram of step (1) in method part in the present invention.
Fig. 5 is the process flow diagram of step (2) in method part in the present invention
Main Reference Numerals is described as follows:
1-dot pattern 2-full tusche point group b
3-has the ink dot a of grey value characteristics
4-has the ink dot a of grey value characteristics
5-has the ink dot a of grey value characteristics
6-has the ink dot a of grey value characteristics
Embodiment
As shown in Figure 2 in embodiment, dot pattern 1 is made up of 3 ink dots 3,4,5 with grey value characteristics and full tusche point group 2, and wherein, full tusche point group 2 is made up of 12 full tusche points.In this embodiment, 3 gray-scale values with the ink dot 3,4,5 of grey value characteristics are all between gray-scale value ~ 255 of full tusche point, and here, gray-scale value is less, and to represent ink dot denseer, otherwise it is lighter to represent ink dot, and gray-scale value is maximum can not more than 255; The gray-scale value of ink dot 3,4,5 is different.All ink dots are all circular.
Under the 600DPI precision of images, all ink dots are 1*1 pixel size, and the minimum spacing of any two adjacent ink dots is 2 pixels.The spacing of above-mentioned two adjacent ink dots refers to the distance of the center of one of them ink dot to the center of another ink dot.
In another embodiment as shown in Figure 3, dot pattern 1 is made up of 4 ink dots 3,4,5,6 with grey value characteristics and full tusche point group 2, and wherein, full tusche point group 2 is made up of 10 full tusche points.In this embodiment, 4 gray-scale values with the ink dot 3,4,5,6 of grey value characteristics are all greater than 0 and are less than the gray-scale value of full tusche point, and wherein, ink dot 5 is identical with the gray-scale value of ink dot 6, and different with the gray-scale value of ink dot 3,4.All ink dots are all square.
Under the 600DPI precision of images, all ink dots are 1*1 pixel size, and the minimum spacing of any two adjacent ink dots is 2 pixels.The spacing of above-mentioned two adjacent ink dots refers to the distance of the center of one of them ink dot to the center of another ink dot.
The invention provides a kind of method distinguishing the dot pattern true and false, comprise typing with reference to dot pattern and the true and false two step greatly distinguishing dot pattern:
(1) typing is with reference to dot pattern, as shown in Figure 4:
S1, by the camera head of dot pattern can be caught, obtain the dot matrix image with reference to dot pattern;
In step sl, following sub-step is comprised:
S10, the camera head that can catch dot pattern send the spectrum of specific wavelength, as infrared light, are radiated on dot pattern, produce the spectrum picture of the specific wavelength of dot pattern;
S11, imaging device capture the spectrum picture of this specific wavelength by optical lens, and convert this image to digital signal by internal circuit, then these digital data transmission are processed to main control MCU.
The gray-scale value of S2, computing reference dot chart picture, if do not meet preset range, then according to the exposure parameter of the gray-scale value adjustment dot matrix image camera head obtained, and repeats step S1; Until the gray-scale value of the dot matrix image obtained meets preset range;
In step s 2, the gray-scale value of described reference picture, refer to the average gray value of whole image, scope is between 0 ~ 255;
In step s 2, the described gray-scale value meeting preset range is between 110 ~ 200; The exposure parameter of described dot matrix image camera head refers to the time shutter of each frame, regulates this parameter can affect the frame per second of catching image, and the gray-scale value of captured images;
The centre coordinate of all ink dots in S3, computing reference dot chart picture and the gray-scale value of all described ink dot a;
In step s3, the centre coordinate of described ink dot obtains after can carry out binary conversion treatment by dot matrix image;
In step s3, the intensity value ranges of described ink dot a is between 0 ~ 255, and a is lighter for gray-scale value larger expression ink dot;
S4, according to the centre coordinate with reference to all ink dots in dot matrix image, this dot matrix image is resolved to corresponding code value, and by the gray-scale value of described ink dot a all in this code value and this dot matrix image, and other relevant information such as name of product etc. is bound, and is saved in database;
In step s 4 which, described database is native database, or the database in the webserver;
(2) true and false of dot pattern is distinguished, as shown in Figure 5:
S5, by the camera head of dot pattern can be caught, obtain the dot matrix image of dot pattern to be distinguished;
In step s 5, following sub-step is comprised:
S50, the camera head that can catch dot pattern send the spectrum of specific wavelength, as infrared light, are radiated on dot pattern, produce the spectrum picture of the specific wavelength of dot pattern;
S51, imaging device capture the spectrum picture of this specific wavelength by optical lens, and convert this image to digital signal by internal circuit, then these digital data transmission are processed to main control MCU.
S6, calculate the gray-scale value of dot matrix image to be distinguished, if do not meet preset range, then according to the exposure parameter of the gray-scale value adjustment dot matrix image camera head obtained, and repeat step S5; Until the gray-scale value of the dot matrix image obtained meets preset range;
In step s 6, the gray-scale value of described reference picture, refer to the average gray value of whole image, scope is between 0 ~ 255;
In step s 6, the described gray-scale value meeting preset range is between 110 ~ 200; The exposure parameter of described dot matrix image camera head refers to the time shutter of each frame, regulates this parameter can affect the frame per second of catching image, and the gray-scale value of captured images;
The centre coordinate of S7, all ink dots calculated in dot matrix image to be distinguished and the gray-scale value of all described ink dot a;
In the step s 7, the centre coordinate of described ink dot obtains after can carry out binary conversion treatment by dot matrix image;
In the step s 7, the intensity value ranges of described ink dot a is between 0 ~ 255, and a is lighter for gray-scale value larger expression ink dot;
Dot matrix image is resolved to corresponding code value by the centre coordinate of all ink dots in S8, basis dot matrix image to be distinguished, according to this code value, Query Database, obtain the gray-scale value of all described ink dot a when typing and in the reference dot matrix image bound of this code value, contrast with the gray-scale value of described ink dot a all in dot matrix image to be distinguished, thus distinguish the true and false of dot pattern current to be distinguished;
In step s 8, described database is native database, or the database in the webserver;
In step s 8, about the control methods of described ink dot a gray-scale value, can with the following method: if differ smaller with reference to the gray-scale value of the gray-scale value of each described ink dot a in the dot matrix image described ink dot a corresponding with dot matrix image to be distinguished, as difference is no more than 10%, then can think that this difference is that error causes, be characterized as true; Otherwise be characterized as vacation; Also can use other discriminating conduct, can adjust according to actual conditions;
S9, basis distinguish that result is extracted corresponding message file and reports;
In step s 9, the type of message file has audio file, video file, image file and text.According to the type of message file distinguishing the correspondence that result is extracted, need to do different process:
If message file is audio file, then promote loudspeaker by power amplifier and play this audio frequency, and show default frame on a display screen;
If message file is video file, then promote the audio stream in loudspeaker playing video files by power amplifier, the video flowing simultaneously on a display screen in playing video file;
If message file is image file, then show this image on a display screen;
If message file is text, then show the text on a display screen.
The invention also discloses a kind of method building described dot pattern, the method is as follows: the ink dot group that there is grey value characteristics, and the gray-scale value of the ink dot a in described ink dot group can regulate, and its gray-scale value is between 0 ~ 255.
The method of the described dot pattern of this structure also comprises the full tusche point group of structure, and the gray-scale value of the ink dot b in described full tusche point group is less than the gray-scale value of described ink dot a; Or the gray-scale value of described ink dot b is greater than the gray-scale value of described ink dot a.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.
Claims (8)
1. a dot pattern, is characterized in that, comprises the ink dot group with grey value characteristics, and the gray-scale value of the ink dot a in described ink dot group can regulate, and its gray-scale value is between 0 ~ 255.
2. dot pattern according to claim 1, is characterized in that, also comprises full tusche point group, and the gray-scale value of the ink dot b in described full tusche point group is less than the gray-scale value of described ink dot a; Or the gray-scale value of described ink dot b is greater than the gray-scale value of described ink dot a.
3. distinguish a method for the dot pattern true and false described in claim 1 or 2, comprise typing with reference to dot pattern and the true and false two step greatly distinguishing dot pattern:
(1) typing is with reference to dot pattern:
S1, by the camera head of dot pattern can be caught, obtain the dot matrix image with reference to dot pattern;
The gray-scale value of S2, computing reference dot chart picture, if do not meet preset range, then according to the exposure parameter of the gray-scale value adjustment dot matrix image camera head obtained, and repeats step S1; Until the gray-scale value of the dot matrix image obtained meets preset range;
The centre coordinate of all ink dots in S3, computing reference dot chart picture and the gray-scale value of all described ink dot a;
S4, according to the centre coordinate with reference to all ink dots in dot matrix image, this dot matrix image is resolved to corresponding code value, and the gray-scale value of described ink dot a all in this code value and this dot matrix image is bound, be saved in database;
(2) true and false of dot pattern is distinguished:
S5, by the camera head of dot pattern can be caught, obtain the dot matrix image of dot pattern to be distinguished;
S6, calculate the gray-scale value of dot matrix image to be distinguished, if do not meet preset range, then according to the exposure parameter of the gray-scale value adjustment dot matrix image camera head obtained, and repeat step S5; Until the gray-scale value of the dot matrix image obtained meets preset range;
The centre coordinate of S7, all ink dots calculated in dot matrix image to be distinguished and the gray-scale value of all described ink dot a;
Dot matrix image is resolved to corresponding code value by the centre coordinate of all ink dots in S8, basis dot matrix image to be distinguished, according to this code value, Query Database, obtain the gray-scale value of all described ink dot a when typing and in the reference dot matrix image bound of this code value, contrast with the gray-scale value of described ink dot a all in dot matrix image to be distinguished, thus distinguish the true and false of current dot pattern;
S9, basis distinguish that result is extracted corresponding message file and reports.
4. method according to claim 3, is characterized in that, in step sl, comprises following sub-step:
S10, the camera head that can catch dot pattern send the spectrum of specific wavelength, are radiated on dot pattern, produce the spectrum picture of the specific wavelength of dot pattern;
S11, imaging device capture the spectrum picture of this specific wavelength by optical lens, and convert this image to digital signal by internal circuit, then these digital data transmission are processed to main control MCU.
5. method according to claim 3, is characterized in that, in step s 5, comprises following sub-step:
S50, the camera head that can catch dot pattern send the spectrum of specific wavelength, are radiated on dot pattern, produce the spectrum picture of the specific wavelength of dot pattern;
S51, imaging device capture the spectrum picture of this specific wavelength by optical lens, and convert this image to digital signal by internal circuit, then these digital data transmission are processed to main control MCU.
6. method according to claim 3, is characterized in that, in step S4 and step S8, described database is the database in the machine, or the database in the webserver.
7. build a method for dot pattern described in claim 1, it is characterized in that, there is the ink dot group of grey value characteristics, the gray-scale value of the ink dot a in described ink dot group can regulate, and its gray-scale value is between 0 ~ 255.
8. method according to claim 7, is characterized in that, the method also comprises the full tusche point group of structure, and the gray-scale value of the ink dot b in described full tusche point group is less than the gray-scale value of described ink dot a; Or the gray-scale value of described ink dot b is greater than the gray-scale value of described ink dot a.
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Cited By (5)
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| CN105243551A (en) * | 2015-10-12 | 2016-01-13 | 上海应用技术学院 | Anti-counterfeiting dot matrix graphic encoding and decoding method applicable to commodity packaging |
| CN107832755A (en) * | 2017-10-13 | 2018-03-23 | 陕西科技大学 | The image collecting device and its application method of dot pattern are formed for swirling eddy |
| CN111598763A (en) * | 2020-04-28 | 2020-08-28 | 南京新智客信息科技有限公司 | Secret mark watermark extraction method and system based on mobile phone and image enhancement |
| CN111597517A (en) * | 2020-04-28 | 2020-08-28 | 南京新智客信息科技有限公司 | Document anti-copying method and system based on image scrambling |
| CN111597516A (en) * | 2020-04-28 | 2020-08-28 | 南京新智客信息科技有限公司 | Document anti-copying method and system based on secret mark watermark |
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Application publication date: 20150225 |