CN106934411A - Electronic paper marking method based on template matches - Google Patents
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- CN106934411A CN106934411A CN201511028554.3A CN201511028554A CN106934411A CN 106934411 A CN106934411 A CN 106934411A CN 201511028554 A CN201511028554 A CN 201511028554A CN 106934411 A CN106934411 A CN 106934411A
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Abstract
The present invention provides a kind of electronic paper marking method based on template matches, comprises the following steps：Obtain paper image to be read and appraised；The characteristic straight line in grade papers image is treated in extraction；Determined to treat the content area in grade papers image according to characteristic straight line；The content in grade papers picture content areas is treated in identification, it is determined that treating the result of going over examination papers of grade papers.Electronic paper marking method of the present invention based on template matches, by paper printed or printing process in the pattern distortion that produces be modified and obtain paper and read and appraise template, the degree of accuracy of template matches when paper is read and appraised can be effectively improved, the electric marking efficiency based on template matches is obviously improved.
Description
Technical field
It is the present invention relates to image recognition and mode identification technology more particularly to a kind of based on template matches
Electronic paper marking method.
Background technology
With the arrival of information age, electronic information technology is continued to develop and is increasingly deep into different industry necks
Domain, and progressively replace complicated artificial operation, drastically increase the treatment effeciency of affairs.At present, pass through
Automatically scanning realizes that electric marking technology has been widely used, compared to traditional group signature mode,
Electric marking greatly improve go over examination papers speed while, mistake of going over examination papers caused by human error can be effectively prevented from
By mistake, the degree of accuracy and fairness that paper is judged are improved.
Mostly in the form of paper is separated with answering card, candidate fills out script to existing electric marking
It is coated on a single answering card, the information on answering card is read by special card reader and is scored.
Although the above-mentioned mode of going over examination papers can improve efficiency of going over examination papers, because examination question is separated with answering card, candidate needs
The independent full-filling of script increased candidate's on answering card, undoubtedly by regulation requirement after answer
Operation complexity.Meanwhile, existing electric marking mode needs to make special answering card, by special
Card reader with particular optical character recognition system carries out answer card information reading, for the printing of answering card
Required precision is high, and cost of manufacture is high, is adapted to relatively large examination, it is impossible in examining for some middle and small scales
In examination be widely popularized using.
It is only applicable to read and appraise objective item by the way of due to realizing electric marking using answering card, at present big
Electric marking in type examination to subjective item is realized by online paper-marking system mostly.Online paper-marking system is used
The form that examination question page with test paper page separate, the electronic image of scrolling is answered by the teacher that gos over examination papers by computer network
Read and appraised, scoring of the marking system to the teacher that gos over examination papers is counted and checked.Online paper-marking system can enter
Row is much more a roll of to be commented, i.e., can respectively be read and appraised by the multiple teacher that gos over examination papers with a test paper page, so as to reduce list
One gos over examination papers produces the probability of error, while online paper-marking system is to environment of going over examination papers, scanning device and paper papery
In the presence of requirement higher, therefore also it is only applied in fairly large and higher significant examination at present.
The education system of China still mainly takes the form of examination to carry out examinee's mastery of knowledge degree at this stage
Inspection, with being on the increase for all kinds of examinations of education and qualifying examination, frequency is corresponding with taking an examination, and is
That how to realize quick, accurate and small cost realizes electric marking, as technical problem urgently to be resolved hurrily at present.
The content of the invention
It is an object of the invention to provide a kind of electronic paper marking method based on template matches, by taking pictures or scanning
Obtain wait after the image of the papery paper read and appraised, by correcting the figure produced in matching amendment paper printing process
As deviation, realize rapidly and accurately carrying out content area in paper using image recognition and content detection technique
After positioning and acquisition of information, statistics obtains paper and reads and appraises result.
In view of this, the present invention provides a kind of electronic paper marking method based on template matches, including：Acquisition is treated
The paper image read and appraised；The characteristic straight line in grade papers image is treated in extraction；Determined according to characteristic straight line to be evaluated
Read the content area in paper image；The content in grade papers picture content areas is treated in identification, is determined to be evaluated
Read the result of going over examination papers of paper.
Preferably, before the step for the treatment of the characteristic straight line in grade papers image described in the extraction, also include：
Treat that grade papers image carries out edge extracting to described, obtain the edge image for treating grade papers image；
The interference pixel region in the edge image is recognized, the corresponding region treated in grade papers image is entered
Row pixel correction.
Preferably, the step for the treatment of the characteristic straight line in grade papers image described in the extraction, specially：Inspection
The characteristic straight line in grade papers image is treated described in surveying, the characteristic straight line with same slope is divided into always
Line set.
Preferably, it is described to treat according to the characteristic straight line determines content area in grade papers image
Before step, also include：The corresponding template paper image of grade papers is treated in acquisition；Detect the template paper
Characteristic straight line in image, divides the characteristic straight line with same slope into same straight line set.
Preferably, it is described to treat according to the characteristic straight line determines content area in grade papers image
Step, specially：Grade papers image is treated described in rotation, makes the spy for treating and being specified in grade papers image
Levy the oblique of straight line in the characteristic straight line set specified in straight line in straight line set and the template paper image
Rate is identical；According to it is described it is postrotational treat grade papers image, it is determined that treating that grade papers are corresponding reads and appraises template
Image；Treat that grade papers are corresponding and read and appraise template image according to described, grade papers image is treated it is determined that described
Content area.
Preferably, it is described according to it is described it is postrotational treat grade papers image, it is determined that treating that grade papers are corresponding
The step of reading and appraising template image, specially：According to the signature identification T in the template paper image, described
Signature identification S corresponding with the signature identification T is detected in paper image to be read and appraised；According to the feature mark
Know the proportionate relationship between the S and signature identification T, treat that grade papers image is zoomed in and out to described；Root
Grade papers image is treated according to after the scaling, it is determined that treating that grade papers are corresponding reads and appraises template image.
Preferably, it is described according to it is described it is postrotational treat grade papers image, it is determined that treating that grade papers are corresponding
The step of reading and appraising template image, also includes：According to the content area in the template paper image, described
The image region for treating selection correspondence position in grade papers image after scaling；Determine each described image
The minimum enclosed rectangle region or minimum circumscribed circle shape region of subregion, amplify described minimum outer with preset ratio
Rectangular area or minimum circumscribed circle shape region are connect, the content regions to be detected treated in grade papers image are obtained
Domain；According to receive confirmation instruction, it is determined that in the content area to be detected for treating grade papers image with
Corresponding characteristic straight line in the content area of the template paper image.
Preferably, treat that grade papers are corresponding described in the basis and read and appraise template image, it is determined that described wait to read and appraise
The step of content area in paper image, specially：Treat that grade papers are corresponding and read and appraise template according to described
Content area in image, it is determined that in the paper image to be read and appraised correspondence position region image.
Electronic paper marking method of the present invention based on template matches, the content of paper is determined according to Examination Paper Template image
Region, by taking pictures or scanning the image for obtaining treating grade papers, to being produced in paper printing or printing process
Pattern distortion be modified after, the content for treating the corresponding region in grade papers image is detected, know
The content that not simultaneously statistic mixed-state is not arrived, so that obtaining paper reads and appraises result.Electronics of the present invention based on template matches
Method to go over files is strong to stability that content area in paper image is identified, accuracy is high, applied widely,
Polytype paper can be applied to, realizes that automatic the reading and appraising of paper counts with result, significantly reduced
The live load of group signature, considerably improves efficiency and accuracy rate that paper is read and appraised.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to implementing
Example or the accompanying drawing to be used needed for description of the prior art are briefly described, it should be apparent that, describe below
In accompanying drawing be only some embodiments of the present invention, for those of ordinary skill in the art, do not paying
On the premise of going out creative labor, other accompanying drawings can also be obtained according to these accompanying drawings：
Fig. 1 shows the schematic flow sheet of the electronic paper marking method based on template matches of the embodiment of the present invention.
Specific embodiment
In order to be more clearly understood that objects, features and advantages of the present invention, below in conjunction with the accompanying drawings and specifically
Implementation method is described in further detail to the present invention.It should be noted that in the case where not conflicting,
Feature in embodiments herein and embodiment can be combined with each other.
Many details are elaborated in the following description in order to fully understand the present invention, but, this is only
Only it is some embodiments of the present invention, the present invention can also be different from other modes described here using other
To implement, therefore, protection scope of the present invention is not limited by following public specific embodiment.
Fig. 1 shows the schematic flow sheet of the electronic paper marking method based on template matches of the embodiment of the present invention.
The electronic paper marking method based on template matches of the embodiment of the present invention, including, step S101, acquisition is treated
The paper image read and appraised；The characteristic straight line in grade papers image is treated in step S102, extraction；Step S103,
Determined to treat the content area in grade papers image according to characteristic straight line；Grade papers are treated in step S104, identification
Content in picture content areas, it is determined that treating the result of going over examination papers of grade papers.
In the technical scheme, first according to completion template paper image is pre-designed, by printing or printing
Obtain the papery paper for taking an examination.Then by taking pictures or scanning the image of the papery paper for obtaining to be read and appraised,
According to the characteristic straight line in paper image to be read and appraised, realized using image recognition and content detection technique quick
Content area in paper is positioned and acquisition of information exactly, statistics obtains paper and reads and appraises result.
In the above-mentioned technical solutions, before the step S102, also include：Grade papers image is treated to described
Edge extracting is carried out, the edge image for treating grade papers image is obtained；In recognizing the edge image
Interference pixel region, pixel correction is carried out to the corresponding region treated in grade papers image.
In the technical scheme, original paper image is likely to result in during due to by scanner scanning papery paper
In there is dark border, the accuracy of the follow-up treatment of going over examination papers of influence, therefore enter the paper image read and appraised is treated
Before row characteristic straight line is extracted, edge extracting can be carried out to paper image, specifically, use edge extracting
To paper image zooming-out edge, (edge image is two-value to algorithm to obtain the corresponding edge image of paper image
Image, wherein pixel value are that 0 pixel represents non-edge part, and pixel value is that 255 pixel is represented
Marginal portion).In the edge image, each pixel chosen respectively on the four edges edge of edge image is made
It is starting pixels point, is moved to the center of edge image along the direction perpendicular to edge image edge, default
Displacement in the range of the nearest pixel value in detection range edge image edge be 255 object pixel
Point (i.e. the nearest marginal point in following limb image border), records the coordinate of the target pixel points.In paper figure
As in detect respectively with the pixel between the starting pixels point pixel corresponding with the coordinate of target pixel points
Whether meet pre-conditioned, if for example, tri- channel values of RGB of 90% pixel are all in the pixel
Less than 200, it is determined that the paper image has the dark border produced in scanning process, and by paper image
The rgb value of the pixel in the region is adjusted to (255,255,255) so as to eliminate the dark border.
In the above-mentioned technical solutions, step S102, specially：The spy in grade papers image is treated described in detection
Straight line is levied, the characteristic straight line with same slope is divided into same straight line set.
In the technical scheme, in the same batch papery paper for being printed according to template paper image or printing is obtained
It is middle to choose any a paper, taken pictures or scanned by this part of papery paper, obtain this part of papery examination
The image I of volume, the characteristic straight line in paper image I to be read and appraised is detected by image recognition.Wherein, feature
Straight line can treat the separator bar in division different content region in grade papers, or constitute to wait to read and appraise examination
The tag line of the content area in volume.The all characteristic straight lines for recognizing will be detected according to different straight slopes
Divided, the straight line with same slope is divided into same characteristic straight line set, obtains multiple Different Slopes
Characteristic straight line set.
Before above-mentioned technical proposal, step S103, also include：The corresponding mould of grade papers is treated described in obtaining
Plate paper image；The characteristic straight line in the template paper image is detected, the feature with same slope is straight
Line divides same straight line set into.
In the technical scheme, the corresponding template paper image of grade papers, the template examination are treated described in acquisition
Volume image is printing or prints the template image for treating grade papers, specifically, according to treating grade papers figure
As the signature identification in I, it is determined that treat the corresponding template paper image of grade papers, wherein, signature identification can be with
It is paper coding, bar code, Quick Response Code.By the characteristic straight line in image recognition detection template paper image,
To detect that all characteristic straight lines for recognizing, according to different straight slopes, are divided into different characteristic straight line collection
Close.
In the above-mentioned technical solutions, step S103, specially：Grade papers image is treated described in rotation, makes institute
The straight line stated in the characteristic straight line set for treating to be specified in grade papers image is specified with the template paper image
Characteristic straight line set in straight line slope it is identical；According to it is described it is postrotational treat grade papers image, really
Surely treat that grade papers are corresponding and read and appraise template image；Treat that grade papers are corresponding and read and appraise template image according to described,
It is determined that the content area treated in grade papers image.
In the technical scheme, during printing or print papery paper according to Examination Paper Template image, due to
There is the pattern distortion that different reasons are caused, cause to treat the area of content area in grade papers, ratio, angle
Distance between degree and content area etc. produces irregular change, it is impossible to according to content regions in template paper image
The distributed intelligence in domain, directly accurately extracts corresponding content area in grade papers image is treated.Therefore, lead to
Cross and rotate the paper image I for readding to be evaluated so that in treating the characteristic straight line set specified in grade papers image I
Straight line, the slope with the straight line in the characteristic straight line set specified in template paper image is identical, so as to correct
Treat the angular deviation between grade papers image I and template paper image.Further, treated according to postrotational
Grade papers image I, it is determined that treating that grade papers are corresponding reads and appraises template image.Specifically, according to template paper
Signature identification T in image, detects corresponding with the signature identification T in the paper image I to be read and appraised
Signature identification S, according to the proportionate relationship between signature identification S and signature identification T, wait to read and appraise to described
Paper image I is zoomed in and out, so as to correct the pantograph ratio treated between grade papers image I and template paper image
Example deviation.So far, by treating rotation and the scaling of grade papers image I, completed to treat grade papers image
Angular deflection and the amendment of scaling between I and template paper image.It is based on further to improve the present embodiment
The degree of accuracy of the electric marking technical scheme of template matches, according to scaling after treat grade papers image I determine treat
Grade papers are corresponding to read and appraise template image, and template image is read and appraised according to this, can pair with treat grade papers figure
As the corresponding papery papers of I treat that grade papers carry out template matches with batch, it is determined that the content in treating grade papers
Region.Specifically, the positional information of the content area in template paper image, after scaling to be evaluated
Read the image region of selection correspondence position in paper image I.Determine the minimum external of each image region
Rectangular area or minimum circumscribed circle shape region, the minimum enclosed rectangle region or minimum are amplified with preset ratio
External border circular areas, obtain treating the content area to be detected in grade papers image I.Template paper is extracted respectively
The corresponding content regions to be detected treated in grade papers image I of content area and the content area in image
Characteristic straight line in domain, according to the confirmation instruction for receiving, it is determined that treating the content to be detected of grade papers image
With corresponding characteristic straight line in the content area of the template paper image in region, grade papers figure is treated in completion
As content area to be detected matches calibration with content area in template paper image in I.For example, receive using
The click at family confirms instruction, it is determined that in treating the content area to be detected of grade papers image with the template paper
Corresponding characteristic straight line in the content area of image, or the click confirmation instruction of user is received, waiting to read and appraise
Rebuild in the content area to be detected of paper image or completion is special with the content area of the template paper image
Levy the straight line of line correspondences.So far, by by treating grade papers after rotation, scaling and characteristic straight line correction
Image I used as template image is read and appraised, wait to read and appraise with batch by pair papery paper corresponding with grade papers image I is treated
Paper is matched, it is determined that the content area in treating grade papers, can rapidly and accurately realize based on template
The electric marking of matching.
In the above-mentioned technical solutions, treat that grade papers are corresponding and read and appraise template image according to described, it is determined that described
The step for the treatment of the content area in grade papers image, specially：Treat that grade papers are corresponding and comment according to described
Read the content area in template image, it is determined that in the paper image to be read and appraised correspondence position region image.
Specifically, the image per portion paper of batch papery paper to be read and appraised is obtained by scanning or taking pictures, is led to
Cross and read and appraise after template image matched, according to the distributed intelligence for reading and appraising content area in template image,
The image-region of correspondence position is extracted in paper image to be read and appraised, the content in the image-region for extracting is recognized
Determine paper reads and appraises result.
The embodiment of the present invention is based on the electronic paper marking method of template matches, according to the template paper figure being pre-designed
Picture, papery paper is obtained by printing or printing, chooses any part in the papery paper of same batch printing
Paper, scanning or taking pictures obtains the sample image of papery paper to be read and appraised, and is carried out by with template paper image
The pattern distortion produced due to the printing of papery paper in the sample image of grade papers is treated in matching and correlation, amendment,
The revised sample image for treating grade papers is read and appraised into template image as to the batch papery paper, is led to
Template matches are crossed rapidly and accurately to complete to treat reading and appraising for grade papers.
State again, all features disclosed in this specification, or disclosed all methods or during step
Suddenly, in addition to mutually exclusive feature and/or step, can combine by any way.
Any feature disclosed in this specification (including any accessory claim, summary and accompanying drawing), removes
Non-specifically describe, can alternative features equivalent by other or with similar purpose replaced.That is, unless
Especially narration, each feature is an example in a series of equivalent or similar characteristics.
The invention is not limited in foregoing specific embodiment.The present invention can expand to any in this explanation
The new feature disclosed in book or any new combination, and disclose any new method or process the step of or
Any new combination.
Claims (8)
1. a kind of electronic paper marking method based on template matches, it is characterised in that comprise the following steps：
Obtain paper image to be read and appraised；
The characteristic straight line in grade papers image is treated described in extracting；
The content area in grade papers image is treated according to the characteristic straight line determines；
The content in grade papers picture content areas is treated described in identification, it is determined that described treat going over examination papers for grade papers
As a result.
2. the electronic paper marking method based on template matches according to claim 1, it is characterised in that institute
Before stating the step for the treatment of the characteristic straight line in grade papers image described in extraction, also include：
Treat that grade papers image carries out edge extracting to described, obtain the edge graph for treating grade papers image
Picture；
The interference pixel region in the edge image is recognized, to the corresponding area treated in grade papers image
Domain carries out pixel correction.
3. the electronic paper marking method based on template matches according to claim 1 and 2, it is characterised in that
The step of characteristic straight line in grade papers image is treated described in the extraction, specially：
The characteristic straight line in grade papers image is treated described in detection, the characteristic straight line with same slope is divided into
Same straight line set.
4. the electronic paper marking method based on template matches according to claim 3, it is characterised in that institute
Before stating the step for the treatment of the content area in grade papers image according to the characteristic straight line determines, also wrap
Include：
The corresponding template paper image of grade papers is treated in acquisition；
The characteristic straight line in the template paper image is detected, the characteristic straight line with same slope is divided into together
One straight line set.
5. the electronic paper marking method based on template matches according to claim 4, it is characterised in that institute
The step for the treatment of the content area in grade papers image according to the characteristic straight line determines is stated, specially：
Grade papers image is treated described in rotation, makes the characteristic straight line set treated and specified in grade papers image
In straight line it is identical with the slope of the straight line in the characteristic straight line set specified in the template paper image；
According to it is described it is postrotational treat grade papers image, it is determined that treating that grade papers are corresponding reads and appraises template image；
Treat that grade papers are corresponding and read and appraise template image according to described, grade papers image is treated it is determined that described
Content area.
6. the electronic paper marking method based on template matches according to claim 5, it is characterised in that institute
State according to it is described it is postrotational treat grade papers image, it is determined that treating the corresponding template image of reading and appraising of grade papers
Step, specially：
According to the signature identification T in the template paper image, in the paper image to be read and appraised detection with
The corresponding signature identification S of the signature identification T；
According to the proportionate relationship between the signature identification S and the signature identification T, wait to read and appraise examination to described
Volume image is zoomed in and out；
Grade papers image is treated after according to the scaling, it is determined that treating that grade papers are corresponding reads and appraises template image.
7. the electronic paper marking method based on template matches according to claim 6, it is characterised in that institute
State according to it is described it is postrotational treat grade papers image, it is determined that treating the corresponding template image of reading and appraising of grade papers
Step, also includes：
According to the content area in the template paper image, grade papers image is treated after the scaling
Choose the image region of correspondence position；
Determine the minimum enclosed rectangle region or minimum circumscribed circle shape region of each described image subregion, with
Preset ratio amplifies the minimum enclosed rectangle region or minimum circumscribed circle shape region, obtains described waiting to read and appraise examination
Content area to be detected in volume image；
According to receive confirmation instruction, it is determined that in the content area to be detected for treating grade papers image with
Corresponding characteristic straight line in the content area of the template paper image.
8. the electronic paper marking method based on template matches according to claim 7, it is characterised in that institute
State and treat that grade papers are corresponding and read and appraise template image according to, it is determined that it is described treat in grade papers image it is interior
The step of holding region, specially：
The corresponding content area read and appraised in template image of grade papers is treated according to described, it is determined that described wait to read and appraise
Paper image in correspondence position region image.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201511028554.3A CN106934411A (en) | 2015-12-31 | 2015-12-31 | Electronic paper marking method based on template matches |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201511028554.3A CN106934411A (en) | 2015-12-31 | 2015-12-31 | Electronic paper marking method based on template matches |
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| CN201511028554.3A Pending CN106934411A (en) | 2015-12-31 | 2015-12-31 | Electronic paper marking method based on template matches |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107423738A (en) * | 2017-08-02 | 2017-12-01 | 广东工业大学 | A kind of paper topic localization method and device based on template matches |
| CN107506746A (en) * | 2017-09-08 | 2017-12-22 | 电子科技大学中山学院 | Locating point-free image identification method and system for intelligent marking system |
| CN107563375A (en) * | 2017-08-28 | 2018-01-09 | 四川大学 | Examination question Position Design and recognition methods |
| CN110110714A (en) * | 2019-04-28 | 2019-08-09 | 重庆学析优科技有限公司 | Method and system are corrected automatically on a kind of line of papery operation |
| CN110569845A (en) * | 2019-09-12 | 2019-12-13 | 苏州大学 | test paper image correction method and related device |
| CN112419450A (en) * | 2020-11-28 | 2021-02-26 | 成都市精卫鸟科技有限责任公司 | Typesetting structure easy for data processing, exercise book, data processing method, device, equipment and medium |
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| CN101334814A (en) * | 2008-04-28 | 2008-12-31 | 华北电力大学 | Automatic scanning and reading system and reading method |
| CN105046200A (en) * | 2015-06-19 | 2015-11-11 | 成都理想境界科技有限公司 | Electronic paper marking method based on line detection |
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| CN101334814A (en) * | 2008-04-28 | 2008-12-31 | 华北电力大学 | Automatic scanning and reading system and reading method |
| CN105046200A (en) * | 2015-06-19 | 2015-11-11 | 成都理想境界科技有限公司 | Electronic paper marking method based on line detection |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107423738A (en) * | 2017-08-02 | 2017-12-01 | 广东工业大学 | A kind of paper topic localization method and device based on template matches |
| CN107423738B (en) * | 2017-08-02 | 2020-10-23 | 广东工业大学 | Test paper subject positioning method and device based on template matching |
| CN107563375A (en) * | 2017-08-28 | 2018-01-09 | 四川大学 | Examination question Position Design and recognition methods |
| CN107506746A (en) * | 2017-09-08 | 2017-12-22 | 电子科技大学中山学院 | Locating point-free image identification method and system for intelligent marking system |
| CN110110714A (en) * | 2019-04-28 | 2019-08-09 | 重庆学析优科技有限公司 | Method and system are corrected automatically on a kind of line of papery operation |
| CN110569845A (en) * | 2019-09-12 | 2019-12-13 | 苏州大学 | test paper image correction method and related device |
| CN112419450A (en) * | 2020-11-28 | 2021-02-26 | 成都市精卫鸟科技有限责任公司 | Typesetting structure easy for data processing, exercise book, data processing method, device, equipment and medium |
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