CN102760225A - Method for positioning answer sheet of test paper objective questions based on rectangular bounding box - Google Patents
Method for positioning answer sheet of test paper objective questions based on rectangular bounding box Download PDFInfo
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- CN102760225A CN102760225A CN2011101107731A CN201110110773A CN102760225A CN 102760225 A CN102760225 A CN 102760225A CN 2011101107731 A CN2011101107731 A CN 2011101107731A CN 201110110773 A CN201110110773 A CN 201110110773A CN 102760225 A CN102760225 A CN 102760225A
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Abstract
The invention discloses a method for positioning an answer sheet of test paper objective questions based on a rectangular bounding box. The method comprises the following steps: taking the rectangular bounding box with the edge width of 1-3mm as a positioning mark for the answer sheet of the test paper objective questions; putting full-filling areas of the answer sheet of the test paper objective questions into rectangular bounding box; establishing a positioning coordinate system by using straight lines of inner and outer boundaries of the rectangular bounding box; normalizing the positioning coordinate system, and performing deformation correction; and positioning option full-filling boxes for the objective questions in a test paper scanning image by the collected coordinate system. The method is not restricted by a test paper layout, the test paper layout is saved, and test paper is closer to natural test paper; and under the condition that the test paper scanning image is extended and deformed, the option full-filling boxes for the objective questions on the test paper scanning image can be still accurately positioned, with strong interference resistance.
Description
Technical field
The present invention relates to paper objective item answer sheet localization method, particularly relate to a kind of paper objective item answer sheet localization method that surrounds frame based on rectangle.
Background technology
In current examination system, the use machine-read card of going over examination papers of objective item utilizes the mode of OMR or computer picture recognition to go over examination papers, and has greatly improved the speed and the correctness of going over examination papers, so obtained being widely used.Because the requirement that computer networking is goed over examination papers, in the great majority examination, objective item and subjective item are put on same the paper, and paper is bigger, and OMR can't handle, so will design paper again.In the application process of novel paper, an important link is the design of machine-readable test paper.
In machine-readable test paper, the objective item part is generally all arranged, for the candidate provides several options selective and full-filling.Will accurately locate these options is the important process in the paper design.The method that generally adopts at present is the printing black telltale mark corresponding in length and breadth with option full-filling frame on the limit of paper.For adapting to and corresponding in length and breadth requirement, these specifically labelled shapes are generally elongated rectangular shape.
Be positioned on the paper limit telltale mark in use, some shortcoming, bigger like engaged position, this hour seems particularly evident at paper.Because the requirement of location, objective item option full-filling frame can only be put in paper and have specifically labelled one side, and when a paper has different subjects, can only different sections purpose objective item option full-filling frame be put together, underaction in the paper design.Have when the paper diverse location under the situation of the above objective item of two covers, can not guarantee the correct judge of objective item.In addition, the papery paper is in the process of scanning, because the mechanical problem of scanner also can make the scan image of paper that stretcher strain is in various degree arranged, when identification examinee full-filling option, can produce bigger error.
Summary of the invention
Technical matters to be solved by this invention is the deficiency that overcomes existing localization method; A kind of paper objective item answer sheet localization method that surrounds frame based on rectangle is provided; This localization method can accurately locate objective item option full-filling zone, save the paper space, can place the full-filling zone flexibly.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme:
The present invention is based on the paper objective item answer sheet localization method of rectangle encirclement frame: adopting hem width is the telltale mark of the rectangle encirclement frame of 1～3mm as paper objective item answer sheet; Place rectangle to surround frame in the full-filling zone of objective item answer sheet; Utilize rectangle to surround the linear structure positioning coordinate system at place, in-out-snap border; With being out of shape correction after this positioning coordinate system regularization, utilize the coordinate system after proofreading and correct, the objective item option full-filling frame in the paper scan image of location.
Concrete, above-mentioned localization method is: adopting hem width is that the rectangle of 2mm surrounds the telltale mark of frame as paper objective item answer sheet, places rectangle to surround frame in the full-filling zone of objective item answer sheet; Answer sheet scanning is after binary conversion treatment; Utilize the morphological image operation, after the Hough conversion, identify the straight line that rectangle surrounds place, in-out-snap border; The structure positioning coordinate system; With being out of shape correction with the design size contrast of rectangle encirclement frame after this positioning coordinate system regularization, utilize the coordinate system after proofreading and correct, the objective item option full-filling frame in the paper scan image of location.
Compared with prior art, the present invention is that the full-filling zone with the objective item answer sheet places a rectangle to surround frame, surrounds frame based on this rectangle and positions; Thereby not receiving the restriction of the paper space of a whole page, can this full-filling zone be placed any position of paper, can be positive; Also can be reverse side, can also in a paper, place a plurality of discontinuous objective item pieces, thereby save the paper space of a whole page; Make paper more approach the nature paper; Have at the paper scan image under the situation of stretcher strain, still can locate the objective item option full-filling frame position on the paper scan image exactly, strong interference immunity.
Description of drawings
Fig. 1 is that a mark and layout planning chart are confined in rectangle encirclement of the present invention;
Fig. 2 is that location of the present invention initial point calculates and a synoptic diagram is confined in the full-filling of multiple-choice question option.
Embodiment
Specify technical scheme of the present invention below in conjunction with accompanying drawing.
Paper design is as shown in Figure 1, and the effective coverage of paper is included zone, paper limit 1, in the paper effective coverage; The 3 outer rectangles of arranging surround frame 2 as telltale mark in objective item full-filling zone, and the size that the telltale mark rectangle surrounds frame 2 is fixed and have the distance of 3mm at least with this zone according to the size in objective item full-filling zone 3, and the hem width of rectangle encirclement frame 2 is 2mm; When the design paper, can full-filling zone 3 and encirclement frame 2 be done the as a whole any position that is positioned in the paper effective coverage, comprise pro and con; Rectangle surrounds the frame 2 outside upper left corners as the location initial point, and the horizontal housing through this point is to the right a positive dirction as horizontal axis; Vertical housing through this point is downwards a positive dirction as the vertical coordinate axle, a location initial point; Article two, straight line has just constituted an elements of a fix system.In rectangle surrounds frame 2, place objective item option full-filling frame 4, each full-filling frame 4 has the certain location coordinate in set coordinate system.
In conjunction with Fig. 2, the localization method of objective item option full-filling frame is following:
1, paper digitizing
Utilize the scanner paper scanning input computer that examinee's full-filling is good, the unwanted color of elimination with this image binaryzation, is removed background, stays the vestige of telltale mark and examinee's full-filling, forms the image that supplies subsequent treatment;
2, image pre-service
Corrosion and expansive working are done in the image copy zone, remove noise, successor operation will carry out in the paper image that this was handled;
3, telltale mark identification
Utilize Canny edge extracting algorithm to extract the rectangle frame outline line;
4, utilize the Hough conversion, select 8 straight-line segments of rectangle frame inner and outer boundary;
5, according to detected straight-line segment, calculate corresponding intersection point of rectangle rim and the corresponding intersection point of rectangle outer rim, select the location initial point 5 of rectangle upper left corner intersection point as this cover objective item option;
6, with the straight line through 6 of location initial point 5 and slant correction points and the angle between horizontal line 7 as standard, carry out the whole slant correction of original image, behind telltale mark identification and slant correction, can set up the elements of a fix and be.The intersection point that surrounds frame 2 lower right corner housing straight lines with rectangle is as stretching check point 8.Utilize this under current coordinate system coordinate and when design this point coordinate compare, calculate the distortion factor of this block scan image, and coordinate system done correction with respect to design proposal.
Its position, coordinate figure location of objective item full-filling frame during 7, according to design; Because the coordinate system consistent with when design arranged, so the full-filling frame coordinate figure when designing can directly can be selected corresponding full-filling information from image, reached set location purpose.
If also have other cover objective item rectangle telltale mark in 8 papers, then repeat top identification positioning step 2 to 8.
Claims (2)
1. paper objective item answer sheet localization method that surrounds frame based on rectangle; It is characterized in that: adopting hem width is the telltale mark of the rectangle encirclement frame of 1～3mm as paper objective item answer sheet; Place rectangle to surround frame in the full-filling zone of objective item answer sheet; Utilize rectangle to surround the linear structure positioning coordinate system at place, in-out-snap border; With being out of shape correction after this positioning coordinate system regularization, utilize the coordinate system after proofreading and correct, the objective item option full-filling frame in the paper scan image of location.
2. according to the said paper objective item answer sheet localization method that surrounds frame based on rectangle of claim 1; It is characterized in that: adopting hem width is the telltale mark of the rectangle encirclement frame of 2mm as paper objective item answer sheet; Place rectangle to surround frame in the full-filling zone of objective item answer sheet, answer sheet scanning is after binary conversion treatment is utilized the morphological image operation; After the Hough conversion; Identify the straight line that rectangle surrounds place, in-out-snap border, the structure positioning coordinate system is with being out of shape correction with the design size contrast of rectangle encirclement frame after this positioning coordinate system regularization; Utilize the coordinate system after proofreading and correct, the objective item option full-filling frame in the paper scan image of location.
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104143082A (en) * | 2014-07-08 | 2014-11-12 | 北京彩云动力教育科技有限公司 | Test paper information positioning method and system based on image fuzz recognition |
| CN104866847A (en) * | 2015-05-20 | 2015-08-26 | 李宇 | Rapid and robust answering card identifying method |
| CN105469040A (en) * | 2015-11-20 | 2016-04-06 | 广州未名中智教育科技有限公司 | Easy-to-identify answering card and manufacturing method thereof |
| CN106033535A (en) * | 2015-03-18 | 2016-10-19 | 成都理想境界科技有限公司 | Electronic paper marking method |
| CN106033534A (en) * | 2015-03-18 | 2016-10-19 | 成都理想境界科技有限公司 | Electronic paper marking method based on linear detection |
| CN106446865A (en) * | 2016-10-12 | 2017-02-22 | 北京新晨阳光科技有限公司 | Answer sheet processing method and device |
| CN106503637A (en) * | 2016-10-12 | 2017-03-15 | 北京新晨阳光科技有限公司 | Test paper processing system |
| CN106570483A (en) * | 2016-11-07 | 2017-04-19 | 厦门市妖猫网络有限公司 | Image positioning method and system |
| CN107169502A (en) * | 2017-03-22 | 2017-09-15 | 广东工业大学 | A kind of option recognition methods based on decision tree |
| CN107368828A (en) * | 2017-07-24 | 2017-11-21 | 中国人民解放军装甲兵工程学院 | High definition paper IMAQ decomposing system and method |
| CN107506764A (en) * | 2017-09-27 | 2017-12-22 | 武汉天量数据技术有限公司 | A kind of answer card filling recognition methods and system |
| CN109741273A (en) * | 2018-12-26 | 2019-05-10 | 江苏优胜信息技术有限公司 | A kind of mobile phone photograph low-quality images automatically process and methods of marking |
| CN110210465A (en) * | 2018-02-28 | 2019-09-06 | 彼乐智慧科技（北京）有限公司 | A kind of method and system of data acquisition |
| CN110276335A (en) * | 2019-07-04 | 2019-09-24 | 华中师范大学 | A kind of mobile terminal paper acquisition method and device |
| CN111507127A (en) * | 2019-01-30 | 2020-08-07 | 吴勇泉 | Answer sheet identification method based on ' moment M00 ' + ' rectangular positioning |
| CN112232345A (en) * | 2020-10-10 | 2021-01-15 | 安徽淘云科技有限公司 | Configuration information determining and image effective area extracting method and device |
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Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104143082A (en) * | 2014-07-08 | 2014-11-12 | 北京彩云动力教育科技有限公司 | Test paper information positioning method and system based on image fuzz recognition |
| CN104143082B (en) * | 2014-07-08 | 2018-06-05 | 北京彩云动力教育科技有限公司 | A kind of paper information locating method and system based on image fuzzy diagnosis |
| CN106033535A (en) * | 2015-03-18 | 2016-10-19 | 成都理想境界科技有限公司 | Electronic paper marking method |
| CN106033534A (en) * | 2015-03-18 | 2016-10-19 | 成都理想境界科技有限公司 | Electronic paper marking method based on linear detection |
| CN106033534B (en) * | 2015-03-18 | 2020-01-31 | 成都理想境界科技有限公司 | Electronic paper marking method based on straight line detection |
| CN106033535B (en) * | 2015-03-18 | 2019-12-13 | 成都理想境界科技有限公司 | Electronic paper marking method |
| CN104866847A (en) * | 2015-05-20 | 2015-08-26 | 李宇 | Rapid and robust answering card identifying method |
| CN104866847B (en) * | 2015-05-20 | 2018-03-16 | 李宇 | A kind of quickly robust answer card identification method |
| CN105469040A (en) * | 2015-11-20 | 2016-04-06 | 广州未名中智教育科技有限公司 | Easy-to-identify answering card and manufacturing method thereof |
| CN106503637A (en) * | 2016-10-12 | 2017-03-15 | 北京新晨阳光科技有限公司 | Test paper processing system |
| CN106446865A (en) * | 2016-10-12 | 2017-02-22 | 北京新晨阳光科技有限公司 | Answer sheet processing method and device |
| CN106570483A (en) * | 2016-11-07 | 2017-04-19 | 厦门市妖猫网络有限公司 | Image positioning method and system |
| CN107169502A (en) * | 2017-03-22 | 2017-09-15 | 广东工业大学 | A kind of option recognition methods based on decision tree |
| CN107368828A (en) * | 2017-07-24 | 2017-11-21 | 中国人民解放军装甲兵工程学院 | High definition paper IMAQ decomposing system and method |
| CN107506764A (en) * | 2017-09-27 | 2017-12-22 | 武汉天量数据技术有限公司 | A kind of answer card filling recognition methods and system |
| CN107506764B (en) * | 2017-09-27 | 2021-07-13 | 武汉天量数据技术有限公司 | Answer sheet filling identification method and system |
| CN110210465A (en) * | 2018-02-28 | 2019-09-06 | 彼乐智慧科技（北京）有限公司 | A kind of method and system of data acquisition |
| CN109741273A (en) * | 2018-12-26 | 2019-05-10 | 江苏优胜信息技术有限公司 | A kind of mobile phone photograph low-quality images automatically process and methods of marking |
| CN111507127A (en) * | 2019-01-30 | 2020-08-07 | 吴勇泉 | Answer sheet identification method based on ' moment M00 ' + ' rectangular positioning |
| CN110276335A (en) * | 2019-07-04 | 2019-09-24 | 华中师范大学 | A kind of mobile terminal paper acquisition method and device |
| CN112232345A (en) * | 2020-10-10 | 2021-01-15 | 安徽淘云科技有限公司 | Configuration information determining and image effective area extracting method and device |
| CN112232345B (en) * | 2020-10-10 | 2022-10-04 | 安徽淘云科技股份有限公司 | Configuration information determination and image effective area extraction method and device |
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Application publication date: 20121031 |