CN110135288B - Method and device for quickly checking electronic certificate - Google Patents
Method and device for quickly checking electronic certificate Download PDFInfo
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- CN110135288B CN110135288B CN201910350234.1A CN201910350234A CN110135288B CN 110135288 B CN110135288 B CN 110135288B CN 201910350234 A CN201910350234 A CN 201910350234A CN 110135288 B CN110135288 B CN 110135288B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/40—Extraction of image or video features
- G06V10/44—Local feature extraction by analysis of parts of the pattern, e.g. by detecting edges, contours, loops, corners, strokes or intersections; Connectivity analysis, e.g. of connected components
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- G06V30/00—Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
- G06V30/10—Character recognition
- G06V30/14—Image acquisition
- G06V30/148—Segmentation of character regions
- G06V30/153—Segmentation of character regions using recognition of characters or words
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Abstract
The invention discloses a method and a device for quickly checking an electronic license, which are characterized in that an electronic license image is processed through high contrast, edge detection is carried out on the high contrast image to obtain a license outline image, a data area subgraph is positioned and obtained, and the electronic license data is obtained by carrying out image processing on the electronic license image, so that a checking result is accurately positioned and quickly checked and output from a complex background.
Description
Technical Field
The disclosure relates to the technical field of data processing and images, in particular to a method and a device for quickly checking an electronic certificate.
Background
At present, along with the popularization of electronic certificates, the electronic certificates are applied in different fields, and the electronic certificates refer to various documents with legal effectiveness, such as identity cards, marriage certificates, batch documents, identification reports, office results and the like, issued by each unit in law, for example, electronic files for photos of various certificates, such as identity cards, marriage certificates, bank repayment running certificates, business licenses and the like; the paper photo can be printed and transmitted by a network. Therefore, at present, the verification work for the electronic certificate is generally to verify the paper certificate or photo image, the verification and verification of the electronic certificate usually needs to manually verify the electronic seal or input the number for inquiry, at present, many electronic certificates are obtained by manually checking the certificate stamp or input the number one by one, or scanning the two-dimensional code and other forms, the operation of personnel is more, particularly, thousands of electronic certificates need to be verified, the efficiency is extremely low, and the image acquisition equipment acquires the paper piece or photo and other images of the electronic certificate, the images may have a very complicated background, and the difficulty of accurately positioning the electronic certificate is increased by adding various problems of the illumination condition and the electronic certificate such as defect, color fading, stain and the like. Therefore, how to accurately position and quickly check the electronic license area from a complex background is an important link in an electronic license identification system.
Disclosure of Invention
The invention provides a method and a device for quickly checking an electronic license, which are used for processing an electronic license image through high contrast, detecting a license outline at the edge, positioning and acquiring a data area subgraph, processing the image of the electronic license image to acquire electronic license data, and accurately positioning and quickly checking and outputting a checking result from a complex background.
In order to achieve the above object, according to an aspect of the present disclosure, there is provided a method for quickly checking an electronic certificate, the method including the steps of:
step 1, collecting an electronic license image;
step 2, preprocessing the contrast of the electronic license image to obtain a high-contrast image;
step 3, carrying out edge detection on the high-contrast image to obtain a license outline image;
step 4, positioning the data area of the license outline image and acquiring a data area subgraph;
step 5, acquiring electronic license data in the data area subgraph;
and 6, checking in a database according to the electronic certificate data and displaying a checking result.
Further, in step 1, the collected electronic license image includes, but is not limited to, any one of a camera and an industrial camera, and the format of the electronic license image includes, but is not limited to, any one of BMP, JPG, GIF, and PNG.
Further, in step 2, the method for preprocessing the contrast of the electronic license image to obtain the high-contrast image is to assign the maximum value of the values of R, G, and B of the electronic license image to R, G, and B, that is, R = G = B = max (R, G, B), to simplify the processing process of the electronic license image, to improve the contrast of the electronic license image, so as to obtain the high-contrast image.
Further, in step 3, the method for edge detection includes, but is not limited to: any one of a Roberts operator, a Sobel operator, a Prewitt operator, a Laplace operator, a Log operator and a Canny operator.
Further, in step 3, the method for obtaining the license contour image by performing edge detection on the high-contrast image includes the following steps:
step 3.1, smoothing the high-contrast image by using a Gaussian function;
step 3.2, partial derivatives are respectively solved along the X direction and the Y direction of the gradient of the high-contrast image by adopting a differential operator, and the amplitude and the direction of the gradient are calculated;
step 3.3, reserving the local gradient maximum value and inhibiting a gradient non-maximum value point;
and 3.4, detecting by using a double-threshold algorithm, and connecting edges to obtain a license outline image.
The certificate outline image can improve the speed and the precision of positioning the data area in the certificate outline image, and reduces the influence of the complex background of the image in the certificate outline image.
Further, in step 4, the data area of the license outline image is an image area with a background color or a background color different from other parts, and the background color or the background color is a color designated by the user.
Further, in step 4, the method for locating the data area of the license profile image and obtaining the sub-image of the data area is that if the RGB values of the colors specified by the user are R, G, and B, when (B-G) + (B-R) =255 × 2, or B > R and B > G, it is determined as the data area of the license profile image; if B < R or B < G of a certain point, judging that the image is not a data area of the license outline image; and scanning the license outline image according to the two rules to locate the data area and obtain a data area subgraph, wherein the data area subgraph is formed by pixel points of the data area, and the data area subgraph is an area of basic information of the license, such as an identity card number of an identity card or a two-dimensional code area.
Further, in step 5, the method for obtaining the electronic license data in the data region sub-image includes counting the total number of pixel values in the column direction of the data region sub-image, performing vertical projection on the data region sub-image by combining a vertical projection method or fixed boundary segmentation, determining the width and height of characters in the data region, calculating the distance between adjacent characters, recognizing the characters through OCR characters (optical character recognition), and sequentially storing the characters in an array to obtain the electronic license data. By determining the width and height of the characters in the data region, calculating the distance between adjacent characters can improve the accuracy and precision of OCR recognition.
Further, in step 6, the method of checking and displaying the checking result in the database according to the electronic license data is that whether the electronic license data exists in the database is judged, whether the electronic license data is consistent with the corresponding license data in the database is judged, if the electronic license data does not exist or is inconsistent with the corresponding license data in the database, "checking failed" information is output as the checking result, and if the electronic license data is judged to be consistent with the corresponding license data in the database, "checking passed" information is output as the checking result, wherein the database is the license database and stores the data information of all the electronic licenses.
The invention also provides a device for quickly checking the electronic certificate, which comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the computer program to operate in the units of:
the license image acquisition unit is used for acquiring an electronic license image;
the high contrast processing unit is used for preprocessing the contrast of the electronic license image to obtain a high contrast image;
the contour detection unit is used for carrying out edge detection on the high-contrast image to obtain a license contour image;
the data positioning unit is used for positioning the data area of the license outline image and acquiring a data area subgraph;
the data acquisition unit is used for acquiring electronic license data in the data area subgraph;
and the quick checking unit is used for checking and displaying a checking result in the database according to the electronic certificate data.
The beneficial effect of this disclosure does: the invention provides a method and a device for quickly checking an electronic license, which can well balance and optimize a stained and fuzzy electronic license image, improve the accuracy and precision of character recognition of the image, remove the adverse effects of various problems of illumination conditions and the electronic license such as defects, fading and stains on character recognition and a positioning data area, and reduce the influence of a complex background of the image in a license outline image.
Drawings
The foregoing and other features of the present disclosure will become more apparent from the detailed description of the embodiments shown in conjunction with the drawings in which like reference characters designate the same or similar elements throughout the several views, and it is apparent that the drawings in the following description are merely some examples of the present disclosure and that other drawings may be derived therefrom by those skilled in the art without the benefit of any inventive faculty, and in which:
FIG. 1 is a flow chart of a method for fast checking an electronic certificate;
fig. 2 shows a device for quickly checking an electronic certificate according to the present disclosure.
Detailed Description
The conception, specific structure and technical effects of the present disclosure will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, aspects and effects of the present disclosure. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Fig. 1 is a flow chart of a method for quickly checking an electronic certificate according to the present disclosure, and a method for quickly checking an electronic certificate according to an embodiment of the present disclosure is described below with reference to fig. 1.
The disclosure provides a method for quickly checking an electronic certificate, which specifically comprises the following steps:
step 1, collecting an electronic license image;
step 2, preprocessing the contrast of the electronic license image to obtain a high-contrast image;
step 3, carrying out edge detection on the high-contrast image to obtain a license outline image;
step 4, positioning the data area of the license outline image and acquiring a data area subgraph;
step 5, acquiring electronic license data in the data area subgraph;
and 6, checking in a database according to the electronic certificate data and displaying a checking result.
Further, in step 1, the collected electronic license image includes, but is not limited to, any one of a camera and an industrial camera, and the format of the electronic license image includes, but is not limited to, any one of BMP, JPG, GIF, and PNG.
Further, in step 2, the method for preprocessing the contrast of the electronic license image to obtain the high-contrast image is to assign the maximum value of the values of R, G, and B of the electronic license image to R, G, and B, that is, R = G = B = max (R, G, B), to simplify the processing process of the electronic license image, to improve the contrast of the electronic license image, so as to obtain the high-contrast image.
Further, in step 3, the method for edge detection includes, but is not limited to: any one of a Roberts operator, a Sobel operator, a Prewitt operator, a Laplace operator, a Log operator and a Canny operator.
Further, in step 3, the method for obtaining the license contour image by performing edge detection on the high-contrast image includes the following steps:
step 3.1, smoothing the high-contrast image by using a Gaussian function;
step 3.2, partial derivatives are respectively solved along the X direction and the Y direction of the gradient of the high-contrast image by adopting a differential operator, and the amplitude and the direction of the gradient are calculated;
step 3.3, reserving the local gradient maximum value and inhibiting a gradient non-maximum value point;
and 3.4, detecting by using a double-threshold algorithm, and connecting the edges to obtain a license outline image.
The license outline image can improve the speed and the precision of positioning the data area in the license outline image, and reduces the influence of the complex background of the image in the license outline image.
Further, in step 4, the data area of the license profile image is an image area with a background color or a background color different from other parts, and the background color or the background color is a color designated by the user.
Further, in step 4, the method for locating the data area of the license profile image and obtaining the sub-image of the data area is that if the RGB values of the colors specified by the user are R, G, and B, when (B-G) + (B-R) =255 × 2, or B > R and B > G, it is determined as the data area of the license profile image; if B < R or B < G of a certain point, judging that the image is not a data area of the license outline image; and scanning the license outline image according to the two rules to locate the data area and obtain a data area subgraph, wherein the data area subgraph is formed by pixel points of the data area, and the data area subgraph is an area of basic information of the license, such as an identity card number of an identity card or a two-dimensional code area.
Further, in step 5, the method for obtaining the electronic license data in the data region sub-image includes counting the total number of pixel values in the column direction of the data region sub-image, performing vertical projection on the data region sub-image by combining a vertical projection method or fixed boundary segmentation, determining the width and height of characters in the data region, calculating the distance between adjacent characters, recognizing the characters through OCR characters (optical character recognition), and sequentially storing the characters in an array to obtain the electronic license data. By determining the width and height of the characters in the data region, calculating the distance between adjacent characters can improve the accuracy and precision of OCR recognition.
Further, in step 6, the method for checking and displaying the checking result in the database according to the electronic license data is that whether the electronic license data exists in the database is judged, whether the electronic license data is consistent with the corresponding license data in the database is judged, if the electronic license data does not exist or is inconsistent with the corresponding license data in the database, "check failed" information is output as the checking result, and if the electronic license data is consistent with the corresponding license data in the database, the "check passed" information is output as the checking result, wherein the database is the license database and stores the data information of all the electronic licenses.
An embodiment of the present disclosure provides a fast checking device for an electronic certificate, as shown in fig. 2, the fast checking device for an electronic certificate of the present disclosure, the fast checking device for an electronic certificate of the embodiment includes: the electronic certificate rapid checking device comprises a processor, a memory and a computer program which is stored in the memory and can run on the processor, wherein the processor executes the computer program to realize the steps in the electronic certificate rapid checking device embodiment.
The device comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the computer program to operate in the units of:
the license image acquisition unit is used for acquiring an electronic license image;
the high-contrast processing unit is used for preprocessing the contrast of the electronic license image to obtain a high-contrast image;
the contour detection unit is used for carrying out edge detection on the high-contrast image to obtain a license contour image;
the data positioning unit is used for positioning the data area of the license outline image and acquiring a data area subgraph;
the data acquisition unit is used for acquiring electronic license data in the data area subgraph;
and the quick checking unit is used for checking and displaying a checking result in the database according to the electronic certificate data.
The quick checking device of the electronic certificate can be operated in computing equipment such as a desktop computer, a notebook computer, a palm computer and a cloud server. The device for quickly checking the electronic certificate can be operated by a processor and a memory. It will be understood by those skilled in the art that the example is merely an example of an electronic certificate rapid checking apparatus, and does not constitute a limitation of an electronic certificate rapid checking apparatus, and may include more or less components than the electronic certificate rapid checking apparatus, or some components in combination, or different components.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, the processor is a control center of the operation device of the electronic certificate rapid checking device, and various interfaces and lines are used for connecting various parts of the operation device of the whole electronic certificate rapid checking device.
The memory can be used for storing the computer program and/or the module, and the processor realizes various functions of the electronic certificate quick checking device by operating or executing the computer program and/or the module stored in the memory and calling data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating device, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
While the present disclosure has been described in considerable detail and with particular reference to a few illustrative embodiments thereof, it is not intended to be limited to any such details or embodiments or any particular embodiments, but it is to be construed as effectively covering the intended scope of the disclosure by providing a broad, potential interpretation of such claims in view of the prior art with reference to the appended claims. Furthermore, the foregoing describes the disclosure in terms of embodiments foreseen by the inventor for which an enabling description was available, notwithstanding that insubstantial modifications of the disclosure, not presently foreseen, may nonetheless represent equivalent modifications thereto.
Claims (6)
1. A quick checking method of an electronic certificate is characterized by comprising the following steps:
step 1, collecting an electronic license image;
step 2, preprocessing the contrast of the electronic license image to obtain a high-contrast image;
step 3, carrying out edge detection on the high-contrast image to obtain a license outline image;
step 4, positioning the data area of the license outline image and acquiring a data area subgraph;
step 5, acquiring electronic license data in the data area subgraph;
step 6, checking and displaying the checking result in the database according to the electronic certificate data;
in step 2, the method for preprocessing the contrast of the electronic license image to obtain a high-contrast image is that the maximum value of the values of R, G, and B of the electronic license image is assigned to R, G, and B, that is, R = G = B = max (R, G, B), so as to obtain the high-contrast image;
in step 3, the method for obtaining the license contour image by performing edge detection on the high-contrast image comprises the following steps:
step 3.1, smoothing the high-contrast image by using a Gaussian function;
step 3.2, partial derivatives are respectively solved along the X direction and the Y direction of the gradient of the high-contrast image by adopting a differential operator, and the amplitude and the direction of the gradient are calculated;
step 3.3, reserving the local gradient maximum value and inhibiting a gradient non-maximum value point;
3.4, detecting by using a double-threshold algorithm, and connecting edges to obtain a certificate outline image;
in step 4, the data area of the license outline image is positioned and the sub-image of the data area is obtained by setting the RGB values of the colors specified by the user as R, G, and B, and determining the data area of the license outline image when (B-G) + (B-R) =255 × 2, or B > R and B > G; if B < R or B < G of a certain point, judging that the image is not a data area of the license outline image; and scanning the license outline image according to the two rules to locate the data area and acquiring a data area subgraph.
2. The method for rapidly checking an electronic license according to claim 1, wherein in step 1, the collecting of the electronic license image comprises any one of a camera and an industrial camera, and the format of the electronic license image comprises any one of a BMP, a JPG, a GIF and a PNG.
3. The method for rapidly checking an electronic certificate as claimed in claim 1, wherein in step 3, the method for detecting the edge comprises: any one edge detection method of a Roberts operator, a Sobel operator, a Prewitt operator, a Laplace operator, a Log operator and a Canny operator.
4. The method for rapidly checking an electronic license according to claim 1, wherein in the step 5, the method for obtaining the electronic license data in the data area subgraph is that the total number of pixel values in the column direction of the data area subgraph is counted, the data area subgraph is vertically projected by combining a vertical projection method or fixed boundary segmentation, so that the width and the height of characters in the data area are determined, the distance between adjacent characters is calculated, the characters are identified by OCR characters, and the characters are sequentially stored in an array to obtain the electronic license data.
5. The method for rapidly verifying an electronic certificate as claimed in claim 4, wherein in step 6, the method for verifying and displaying the verification result in the database according to the electronic certificate data is that whether the electronic certificate data exists in the database is judged, whether the electronic certificate data is consistent with the corresponding certificate data in the database is judged, if the electronic certificate data does not exist or is inconsistent with the corresponding certificate data in the database, the information of 'verification failed' is output, and if the electronic certificate data is judged to be consistent with the corresponding certificate data in the database, the information of 'verification passed' is output.
6. An apparatus for rapidly verifying an electronic certificate, which is applied to the method for rapidly verifying an electronic certificate according to claim 1, the apparatus comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the computer program to operate in the units of:
the license image acquisition unit is used for acquiring an electronic license image;
the high-contrast processing unit is used for preprocessing the contrast of the electronic license image to obtain a high-contrast image;
the contour detection unit is used for carrying out edge detection on the high-contrast image to obtain a license contour image;
the data positioning unit is used for positioning the data area of the license outline image and acquiring a data area subgraph;
the data acquisition unit is used for acquiring electronic license data in the data area subgraph;
and the quick checking unit is used for checking and displaying a checking result in the database according to the electronic certificate data.
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| CN111230862B (en) * | 2020-01-10 | 2021-05-04 | 上海发那科机器人有限公司 | Handheld workpiece deburring method and system based on visual recognition function |
| CN112580618A (en) * | 2020-10-30 | 2021-03-30 | 中电万维信息技术有限责任公司 | Electronic license verification method based on OCR |
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| CN101510258B (en) * | 2009-01-16 | 2013-02-13 | 北京中星微电子有限公司 | Certificate verification method, system and certificate verification terminal |
| CN101561876A (en) * | 2009-06-05 | 2009-10-21 | 四川泸州航天金穗高技术有限公司 | Method and system for collecting and identifying ID card information |
| CN101655981A (en) * | 2009-09-09 | 2010-02-24 | 谭洪舟 | Method for detecting and adjusting inversion of certificate image |
| CN102306378B (en) * | 2011-09-14 | 2013-02-13 | 电子科技大学 | Image enhancement method |
| CN102426649B (en) * | 2011-10-13 | 2013-08-21 | 石家庄开发区冀科双实科技有限公司 | Simple steel seal digital automatic identification method with high accuracy rate |
| CN103455994A (en) * | 2012-05-28 | 2013-12-18 | 佳能株式会社 | Method and equipment for determining image blurriness |
| CN104346609B (en) * | 2013-08-01 | 2018-05-04 | 阿里巴巴集团控股有限公司 | The method and device of character on a kind of identification printed matter |
| CN107067382A (en) * | 2017-05-11 | 2017-08-18 | 南宁市正祥科技有限公司 | A kind of improved method for detecting image edge |
| CN109446900A (en) * | 2018-09-21 | 2019-03-08 | 平安科技（深圳）有限公司 | Certificate authenticity verification method, apparatus, computer equipment and storage medium |
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