CN104573647B - A kind of recognition methods of illegal identity certificate and device - Google Patents
A kind of recognition methods of illegal identity certificate and device Download PDFInfo
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- CN104573647B CN104573647B CN201410843338.3A CN201410843338A CN104573647B CN 104573647 B CN104573647 B CN 104573647B CN 201410843338 A CN201410843338 A CN 201410843338A CN 104573647 B CN104573647 B CN 104573647B
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Abstract
The present invention discloses recognition methods and the device of a kind of illegal identity certificate, and the recognition methods of the non-identity document includes step：Obtain the rgb value of each pixel of portrait photographs on identity document to be identified；Mean square deviation calculating is carried out to the RGB component of each pixel of the portrait photographs respectively, obtains the deviation of each pixel；Mean value computation is carried out to the deviation of all pixels point, obtains the threshold of the portrait photographs；Judge whether the threshold of the portrait photographs is less than the threshold for the duplication photo being obtained ahead of time, if so, the judgement certificate to be identified is copy, if it is not, then judging the certificate to be identified for original paper.The present invention can effectively identify the identity document of duplicating, prevent other people from being usurped by illegal molecule identity document.
Description
Technical field
The present invention relates to field of image recognition, the recognition methods more particularly to a kind of illegal identity certificate and device.
Background technology
As that reforms and opens up to the outside world both at home and abroad gos deep into, foreign affairs certificates handling business increases, the development of real-name train ticket and phone
The implementation of user's real name registration system degree, mobile system of real name etc. of applying for card, certificate, which is taken pictures, also more and more extensive is applied to all trades and professions.
During handling these business, being no lack of has the copy by identity card to replace original paper, and being provided to criminal can multiply
Machine.The application of current identity document identification technology in the industry is fewer and fewer, is also that price is more expensive if having, in addition to
Except banking system, other enterprises can not be related to because of the price of its costliness.Existing certificate photographing device technical solution exist with
Lower disadvantage：
1, ambient light is relied on big, when dark, has bright spot on the image taken pictures, influence the stabilization of identification
Property.
2, bigger to the camera dependence of equipment, the image color cast degree that different equipment is taken is different, shadow
Ring recognition effect.
It is therefore necessary to be improved to the identification of identity document copy photo and identity document original paper photo.
Invention content
The technical problem to be solved by the present invention is to：The recognition methods of a kind of cheap and efficient illegal identity certificate is provided
And device, captured photo is the photo of identity document original paper or the photo of copy for identification.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：A kind of knowledge of illegal identity certificate is provided
Other method, includes the following steps：
Obtain the rgb value of each pixel of portrait photographs on identity document to be identified；
Mean square deviation calculating is carried out to the RGB component of each pixel of the portrait photographs respectively, obtains the deviation of each pixel
Value；
Mean value computation is carried out to the deviation of all pixels point, obtains the threshold of the portrait photographs；
Judge whether the threshold of the portrait photographs is less than the threshold for the duplication photo being obtained ahead of time, if so, judgement institute
It is copy to state certificate to be identified, if it is not, then judging the certificate to be identified for original paper.
In order to solve the above-mentioned technical problem, the present invention also provides another technical solutions is：Illegal body described in one is provided
The identification device of part certificate, including acquiring unit, the first computing unit, the second computing unit and judging unit；
The acquiring unit is used to obtain the rgb value of each pixel of portrait photographs on identity document to be identified；
First computing unit is by respectively carrying out based on mean square deviation the RGB component of each pixel of the portrait photographs
It calculates, obtains the deviation of each pixel；
Second computing unit is used to carry out mean value computation to the deviation of all pixels point, obtains the portrait photographs
Threshold；
The judging unit is used to judge whether the threshold of the portrait photographs to be less than the fault for the duplication photo being obtained ahead of time
Value, if so, the judgement certificate to be identified is copy, if it is not, then judging the certificate to be identified for original paper.
The beneficial effects of the present invention are：The expensive of the identification device of middle identity document is different from the prior art, deposits
The problems such as high using threshold, the recognition methods of illegal identity certificate provided by the invention and device are by comparing identity to be identified
The chromaticity distortion threshold of certificate photograph and the chromaticity distortion threshold of copy photo, to judge that identity document photo to be identified is
No is original paper photo, and the present invention can accurately and efficiently identify whether identity document photo is that the photo of original paper still duplicates
The photo of part, and the present invention relates to hardware it is simply at low cost, it is low using threshold, it is highly practical, be easy to use promote.
Description of the drawings
Fig. 1 is the schematic flow diagram of illegal identity certificate recognition methods of the present invention；
Fig. 2 is the functional block diagram of illegal identity certificate identification device of the present invention；
Fig. 3 is the analysis chart of picture RGB color；
Fig. 4 is the flow diagram for the deviation that each pixel is obtained in the present invention；
Fig. 5 is the flow diagram for the threshold that the identity document photo is obtained in the present invention；
Fig. 6 is normal function curve synoptic diagram.
Label declaration：
10, acquiring unit；20, the first computing unit；30, the second computing unit；
40, judging unit.
Specific implementation mode
To explain the technical content, the achieved purpose and the effect of the present invention in detail, below in conjunction with embodiment and coordinate attached
Figure is explained.
The design of most critical of the present invention is：By comparing identity document to be identified photo chromaticity distortion threshold with it is multiple
The chromaticity distortion threshold of printed document photo, to judge whether identity document photo to be identified is original paper photo.
Fig. 1 to Fig. 6 is please referred to, a kind of recognition methods of illegal identity certificate includes the following steps：
Obtain the rgb value of each pixel of identity document photo to be identified；
Mean square deviation calculating is carried out to the RGB component of each pixel of identity document photo respectively, obtains each pixel
Deviation；
Mean value computation is carried out to the deviation of all pixels point, obtains the threshold of the identity document photo；
Judge whether the threshold of the identity document photo is less than the threshold for the duplication photo being obtained ahead of time, if so, sentencing
The fixed certificate photograph to be identified is copy photo, if it is not, then judging the certificate photograph to be identified for original paper photo.
As can be seen from the above description, the beneficial effects of the present invention are：The present invention by identity document copy (or other
Copy) photo analyzed, the chromaticity distortion threshold of copy photo is obtained, as shown in fig. 6, due to copy photo
Threshold is in normal distribution, and the threshold of identity document original paper photo and the threshold of copy photo differ greatly, therefore, more
Then photo close to the threshold is that the probability of copy photo is bigger, and the present invention is calculated to obtain to compare by mean square deviation and waits knowing
The threshold of other identity document photo, and the threshold for the copy for comparing the threshold and obtaining in advance judges the identity document photo
Whether it is original paper photo, the present invention differentiates that accuracy is high, and highly practical, involved hardware is simply cheap, convenient for promoting
It uses, effectively prevent criminal and handle the business of various real name registrations using other people Copy of ID Card to reach oneself
Interests.
The invention is realized in this way：Picture is copied to the picture of BMP formats, takes out the value of the RGB in dot array data, is led to
The mean square deviation for crossing each pixel RGB component is calculated and is compared, and finds out an error threshold, this error threshold is in normal distribution
, and a large amount of data detection of process and mass data operate to obtain the referred to as fixed threshold of the small threshold of application condition, this is fixed
Threshold is the threshold of final duplication photo.
Wherein, error threshold be to the RGB components of BMP format pictures by series of algorithms obtains one carry error
Threshold.
The characteristic of distribution function refer to when closer to a fixed value when be considered as occur probability it is very big, it is remoter
Probability from the generation of this value is with regard to smaller.When the threshold of the picture of a certificate is considered as close to our threshold the photograph of this certificate
Piece is invalid, conversely, being effective certificate picture.
In order to further determine the threshold of copy, the accuracy of identification is improved, the threshold for replicating photo is by multiple
The threshold of photo is replicated come depending on be averaged, specifically determining step includes：
Obtain the rgb value for each pixel that two or more are replicated photo；
The mean square deviation for calculating separately the RGB component of each pixel in each duplication photo, obtains the deviation of each pixel；
The mean value for calculating separately all pixels point deviation in each duplication photo, obtains each threshold for replicating photo；
It is the threshold for replicating photo to take the average value of each threshold for replicating photo.
Wherein, the photo that replicates is photostating for BMP format pictures.
Further, in the present embodiment, the threshold ranging from 0-15 for replicating photo, certainly in other embodiment party
In formula, the threshold range for replicating photo may be 0-17.
It judges by accident in order to prevent, in another embodiment, sets an error threshold, only when identity document to be identified shines
The threshold of piece just judges the photo for duplicate photo when differed with the threshold for replicating photo less than error threshold.
Referring to Fig. 2, another technical solution provided by the invention is：
The identification device of illegal identity certificate described in one, including acquiring unit 10, the first computing unit 20, second calculate
Unit 30 and judging unit 40；
The acquiring unit 10 is used to obtain the rgb value of each pixel of identity document photo to be identified；
First computing unit 20 carries out the RGB component of each pixel of identity document photo for respectively square
Difference calculates, and obtains the deviation of each pixel；
Second computing unit 30 is used to carry out mean value computation to the deviation of all pixels point, obtains the identity card
The threshold of part photo；
The judging unit 40 is used to judge whether the threshold of the identity document photo to be less than the duplication being obtained ahead of time and shine
The threshold of piece, if so, the judgement certificate photograph to be identified is copy photo, if it is not, then judging the certificate to be identified
Photo is original paper photo.
The present invention by mean square deviation calculate obtain identity document photo more to be identified threshold, and compare the threshold with
The threshold of the copy obtained in advance judges whether the identity document photo is original paper photo, and the present invention differentiates that accuracy is high, real
Strong with property, involved hardware is simply cheap, convenient for promoting the use of, criminal is effectively prevent to utilize other people identity card
Copy reaches the interests of oneself to handle the business of various real names registration.
In order to further determine the threshold of copy, the accuracy of identification is improved, the judging unit 40 replicates photo
The measured step of threshold is：
Obtain the rgb value for each pixel that two or more are replicated photo；
The mean square deviation for calculating separately the RGB component of each pixel in each duplication photo, obtains the deviation of each pixel；
The mean value for calculating separately all pixels point deviation in each duplication photo, obtains each threshold for replicating photo；
It is the threshold for replicating photo to take the average value of each threshold for replicating photo.
In the present embodiment, the threshold ranging from 0-15 for replicating photo.
The relevant knowledge of normal distyribution function：
One, so-called normal distyribution function refers to that the probability density of random variable of continuous type X is：
Wherein μ, σ (σ>0) it is constant, then X is claimed to obey parameter μ, the normal distribution of σ or Gaussian Profile.Be denoted as X~N (μ,
σ2).As shown in Figure 6.
Two, the geometric properties of normal probability density function：
(1) curve is symmetrical about x=μ.
(2) as x=μ, f (x) obtains maximum value
(3) as x → ± ∞, f (x) → 0.
(4) curve has inflection point at x=μ ± σ.
Three, normal distribution N (μ, σ2) graphic characteristics：
μ determines that the center of figure, σ determine the steep at peak in figure.
Normal distribution is a kind of most common most important distribution, such as measurement error, the physiological characteristic size such as height of people,
Weight etc.；The product size produced under normal circumstances:The all approximate Normal Distribution such as diameter, length, weight, height.
Four, the chance phenomenon that normal distribution can portray：
If stochastic variable is influenced by numerous mutually independent enchancement factors, the influence of each individual factor is all small
, and these influence have additivity feature, then and X Normal Distributions is for example：
The error of various measurements；The physiological characteristic index of people；
The size of factory products；The harvest yield of crops；
The height of ocean wave；The tensile strength of metal wire；
Thermal noise current strength；Total marks of the examination of students etc..
Five, normal distribution is most important distribution in probability theory, is embodied in the following areas：
(1) normal distribution is one of most common distribution in nature and engineering technology, and a large amount of chance phenomenon is all to obey
Or approximate Normal Distribution.In fact if a random index is influenced by factors, but any of which one
Factor does not play a decisive role, then the certain obedience of the random index or approximate Normal Distribution.
(2) normal distribution can be as the APPROXIMATE DISTRIBUTION of many distributions.
(3) there are many good properties not available for other distributions for normal distribution.
The distribution function that the present invention is showed is in standardized normal distribution.
Six, standardized normal distribution refers to distribution N (μ, the σ when normal state2) in μ=0, when σ=1, such normal distribution
Referred to as standardized normal distribution is denoted as N (0,1).
The probability density of standardized normal distribution is expressed as：
The distribution function of standardized normal distribution is expressed as：
The formula of mean square error：
Fig. 1 to Fig. 6 is please referred to, the embodiment of the present invention one is：A kind of recognition methods of illegal identity certificate.
By experiment and orientation ratio to finding, the value of the RGB component of the image of copy is very close to and in color gamut
Ratio very little shared by face, so by conclusions, the recognition methods of this illegal identity certificate includes step：
Step 1：Take out the rgb value of each pixel of picture；By having many pictures per pictures known to the bitmap of every pictures
The rgb value of element, each pixel is not quite similar, so to identify that picture must obtain the RGB component of each pixel.
Step 2：The deviation that mean square deviation operation obtains each pixel is carried out to each pixel.
Step 3：All deviations are subjected to mean operation again and obtain the threshold with error.According to the spy of distribution function
When property obtains when each pixel is close to a median probability bigger this separate value, probability compares
Small, so for identification validity, for threshold closer to certain number, probability is bigger, conversely, then smaller.
Step 4：The threshold of a large amount of copies is obtained by many experiments, these are all the thresholds with error, by them
An average is averagely obtained, this is exactly the threshold with minimum error, and referred to as fixed threshold, is to judge certificate validity
Foundation.
Step 5：It is less than fixed threshold when a pictures pass through the threshold that above-mentioned steps 1, step 2, step 3 obtain, i.e.,
For invalid certificate figure, if it is being then effective certificate figure more than fixed threshold.
The present invention has actual meaning, to improve the robustness of certificate identification software, business operation high efficiency and
Accuracy provides the guarantee of quality, it is therefore prevented that invalid voucher picture circulates on the market instead of original paper, such as certificate duplicating
Part etc..
In conclusion the recognition methods of illegal identity certificate provided by the invention and device not only identify accuracy height, and
And the hardware being related to is simple, and it is of low cost, it is easy to use and promotes.
Example the above is only the implementation of the present invention is not intended to limit the scope of the invention, every to utilize this hair
Equivalents made by bright specification and accompanying drawing content are applied directly or indirectly in relevant technical field, include similarly
In the scope of patent protection of the present invention.
Claims (6)
1. a kind of recognition methods of illegal identity certificate, which is characterized in that include the following steps：
Obtain the rgb value of each pixel of identity document photo to be identified；
Mean square deviation calculating is carried out to the RGB component of each pixel of identity document photo respectively, obtains the deviation of each pixel
Value；
Mean value computation is carried out to the deviation of all pixels point, obtains the threshold of the identity document photo；
Judge whether the threshold of the identity document photo is less than the threshold for the duplication photo being obtained ahead of time, if so, judgement institute
It is copy photo to state certificate photograph to be identified, if it is not, then judging the certificate photograph to be identified for original paper photo.
2. the recognition methods of illegal identity certificate according to claim 1, which is characterized in that the threshold for replicating photo
Acquisition methods be：
Obtain the rgb value for each pixel that two or more are replicated photo；
The mean square deviation for calculating separately the RGB component of each pixel in each duplication photo, obtains the deviation of each pixel；
The mean value for calculating separately all pixels point deviation in each duplication photo, obtains each threshold for replicating photo；
It is the threshold for replicating photo to take the average value of each threshold for replicating photo.
3. the recognition methods of illegal identity certificate according to claim 2, which is characterized in that the threshold for replicating photo
Ranging from 0-15.
4. a kind of identification device of illegal identity certificate, which is characterized in that including acquiring unit, the first computing unit, the second meter
Calculate unit and judging unit；
The acquiring unit is used to obtain the rgb value of each pixel of identity document photo to be identified；
First computing unit is by respectively carrying out based on mean square deviation the RGB component of each pixel of identity document photo
It calculates, obtains the deviation of each pixel；
Second computing unit is used to carry out mean value computation to the deviation of all pixels point, obtains the identity document photo
Threshold；
The judging unit is used to judge whether the threshold of the identity document photo to be less than the fault for the duplication photo being obtained ahead of time
Value, if so, the judgement certificate photograph to be identified is copy photo, if it is not, then judging that the certificate photograph to be identified is
Original paper photo.
5. the identification device of illegal identity certificate according to claim 4, which is characterized in that the judging unit obtains multiple
The method of the threshold of photo processed is：
Obtain the rgb value for each pixel that two or more are replicated photo；
The mean square deviation for calculating separately the RGB component of each pixel in each duplication photo, obtains the deviation of each pixel；
The mean value for calculating separately all pixels point in each duplication photo, obtains each threshold for replicating photo；
It is the threshold for replicating photo to take the average value of each threshold for replicating photo.
6. the identification device of illegal identity certificate according to claim 5, which is characterized in that the threshold for replicating photo
Ranging from 0-15.
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| CN106991451A (en) * | 2017-04-14 | 2017-07-28 | 武汉神目信息技术有限公司 | A kind of identifying system and method for certificate picture |
| SG11201811691RA (en) | 2017-06-30 | 2019-01-30 | Beijing Didi Infinity Technology & Development Co Ltd | Systems and methods for verifying authenticity of id photo |
| CN107832679B (en) * | 2017-10-20 | 2021-07-30 | 创新先进技术有限公司 | Certificate verification and identity verification method and device |
| CN110232322B (en) * | 2019-05-13 | 2024-06-28 | 平安科技（深圳）有限公司 | Authentication method and device for identity card, computer equipment and storage medium |
| CN110516679B (en) * | 2019-08-30 | 2021-05-28 | 王晓 | Method and system for examining materials with official seal |
| CN110619290B (en) * | 2019-08-30 | 2021-01-19 | 王晓 | Method and system for on-line examining business license |
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