CN116486411A - Method for collecting handwriting answer area in test paper - Google Patents
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- CN116486411A CN116486411A CN202310241031.5A CN202310241031A CN116486411A CN 116486411 A CN116486411 A CN 116486411A CN 202310241031 A CN202310241031 A CN 202310241031A CN 116486411 A CN116486411 A CN 116486411A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V30/00—Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
- G06V30/10—Character recognition
- G06V30/14—Image acquisition
- G06V30/1444—Selective acquisition, locating or processing of specific regions, e.g. highlighted text, fiducial marks or predetermined fields
- G06V30/1448—Selective acquisition, locating or processing of specific regions, e.g. highlighted text, fiducial marks or predetermined fields based on markings or identifiers characterising the document or the area
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- G06—COMPUTING; CALCULATING OR COUNTING
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- G06Q50/205—Education administration or guidance
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V30/00—Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
- G06V30/10—Character recognition
- G06V30/14—Image acquisition
- G06V30/146—Aligning or centring of the image pick-up or image-field
- G06V30/147—Determination of region of interest
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- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- 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
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Abstract
The invention discloses a method for collecting a handwriting answer area in a test paper, which comprises the steps of reserving an identification code; identifying a rectangular frame; filling in the content of the identification code, and recording the id information of the questions and the position information of the rectangular frame together in the identification code; after the student answers, scanning the test paper, identifying and analyzing the identification code in the scanned image, and then cutting an answer area of the student on the test paper picture in a form of outwards expanding a rectangular frame by 25% by utilizing the analyzed content; and processing the image. According to the scheme, the information of the student for answering is further obtained by adding the identification code, so that automatic correction of objective questions and electronic examination paper of subjective questions can be conveniently carried out later; by expanding the rectangular frame, when the writing content of the student exceeds the answer range, the input of the answer area can be realized, and the influence on the score is avoided.
Description
Technical Field
The invention relates to the technical field of test paper correction, in particular to a method for collecting a handwriting answer area in a test paper.
Background
Students receive education, need a great number of daily exercises and exams to consolidate the learned knowledge, the exercises and exams are generally paper homework or examination papers, the students need to write own answers in corresponding areas, for example, a bracket area for filling in blank questions is selected, an underline area for filling in blank questions is needed, and teachers are needed to correct the exercises and examination papers and feed back to the students. For the way of correction, there are the following methods: one is that students directly answer on practice or test paper, collect and give to teachers and change uniformly, thus the problem is that a great deal of time is wasted for the teachers to change the practice or test paper repeatedly, and the efficiency is low; the other is to make corresponding answer sheets for each exercise or test paper, students write answers on the answer sheets, scan the answer sheets to a computer by a machine, realize automatic correction of objective questions, and correct subjective questions by a teacher at the computer end, thus really reducing the load of the teacher, but the problem is that a large amount of resources are consumed, and the method is not environment-friendly.
The Chinese patent discloses a method for collecting a handwriting answer area in a test paper based on an identification code, which comprises the following steps: CN113095312a, which is to remove the white area and the context area, for some test questions, if the writing content of the student is out of the answer range, the score is easily affected.
Disclosure of Invention
The invention mainly aims to provide a method for collecting a handwriting answer area in a test paper, so as to solve the problem that in the related art, the achievement is easily affected when the writing content of students exceeds the answer range.
In order to achieve the above purpose, the present invention provides a method for collecting a handwritten answer area in a test paper, comprising the following steps:
s1, reserving an identification code, namely reserving the position of the identification code in the exercise or test paper when the exercise or test paper is generated, covering a region which corresponds to the region which needs to be responded by students with a rectangular frame with a special color, and generating a test paper picture;
s2, identifying a rectangular frame, scanning the generated test paper picture, identifying the rectangular frame with a special color, and acquiring the position information of the rectangular frame in the test paper;
s3, filling in the content of the identification code, and recording the id information of the questions and the position information of the rectangular frame together in the identification code;
s4, uploading pictures, after the students answer, scanning the test paper, identifying and analyzing the identification codes in the scanned images, and then cutting an answer area of the students on the test paper picture in a form of outwards expanding a rectangular frame by 25% by utilizing the analyzed contents;
s5, processing the image, and performing image processing operation on the cut answer area after cutting is completed, so as to accurately acquire the answer area of the student.
In one embodiment of the present invention, the step S1 includes the steps of:
s1.1, setting an identification code, reserving the position of the identification code in a test paper when the test paper is generated, setting the identification code to be square, setting the position to the left side of each title, and setting the identification code to be a two-dimensional code;
s1.2, covering rectangular frames on the answering area, and distinguishing the answering areas of the questions by using rectangular frames with different colors according to the types of the questions answered by students, wherein the questions with the same type adopt rectangular frames with the same color.
In one embodiment of the present invention, the step S2 includes the steps of:
s2.1, acquiring a test paper image, and reading the image obtained by scanning the test paper into a system;
s2.2, acquiring rectangular frame information, identifying the rectangular frame with special color by using an opencv image processing method, and acquiring the position information of the rectangular frame in the test paper, wherein the position information comprises the bit value of the rectangular center point in the test paper image, and the width and the height of the rectangle.
In one embodiment of the present invention, the step S3 includes the steps of:
s3.1, question information, wherein a teacher selects a question in a question bank, each question in the question bank is provided with a unique id in a database, and the id is set as a 32-bit hexadecimal character string;
s3.2, marking the position information of the reserved identification code in the image, setting the coordinates of the center of the identification code in the image as (X, Y), setting the height of the identification code as H and setting the width of the identification code as W;
s3.3, marking the position information of each rectangular frame, setting the coordinates of the center of the rectangular frame in the image as (X ', Y'), setting the height of the rectangular frame as H ', and setting the width of the rectangular frame as W';
s3.4, inputting information in the identification codes, and setting only one corresponding identification code for one title.
In one embodiment of the present invention, the step S4 includes the steps of:
s4.1, scanning the test paper, after the student finishes answering, uniformly collecting the test paper by a teacher, and then obtaining pictures of the test paper through photographing or scanning;
s4.2, identifying and analyzing the identification code, positioning the identification code by using a digital image processing technology and analyzing the content in the picture;
s4.3, cutting an answer area, cutting the answer area of the student on the test paper picture according to the analyzed content and the outward expansion of the rectangular frame by 25%, and storing the cut image.
In one embodiment of the invention, the rectangular frame expands 25% outwards and 25% each of the side lines of the rectangular frame expands up, down, left and right.
In one embodiment of the present invention, when the answer area is cut in S4.3, the text detection module EAST is used to mark the handwritten text area.
In one embodiment of the present invention, in S5, after the area including the student response information is cut, the cut picture is processed using a digital image processing operation.
In one embodiment of the present invention, in the step S5, the cutting image processing operation includes the steps of:
s5.1, clearing the white area, and clearing the white area around the student response information area;
s5.2, clearing the context area, and clearing the context information of the title outside the handwriting text area.
In one embodiment of the present invention, the relative position information of each rectangular frame includes four components, wherein the four components are (X '-X)/(H), (Y' -Y)/(H, H '≡h, W' ≡w), and the calculated result is sequentially added to the identification code.
Compared with the prior art, the invention has the beneficial effects that:
1. the method has the advantages that the information of the student answer is further obtained by adding the identification code, so that automatic correction of objective questions and electronic examination papers of subjective questions can be conveniently carried out later;
2. the cost is low, the popularization is easy, the process can be realized only by placing the identification code on the left side of the question, an answer sheet is not required to be appointed for exercise or test paper, the resource is saved, and the environment is protected;
3. the electronic examination paper reading of the teacher is convenient, the automatic correction of the teacher is realized by adopting a computer, and meanwhile, no modification is made to the answer area, so that the influence on the answer habit already developed by students is avoided;
4. by expanding the rectangular frame, when the writing content of the student exceeds the answer range, the input of the answer area can be realized, and the influence on the score is avoided.
Drawings
FIG. 1 is a schematic block diagram of a method for collecting handwritten answer regions in a test paper according to an embodiment of the invention;
FIG. 2 is a schematic block diagram of step S1 of a method for collecting handwritten answer regions in a test paper according to an embodiment of the invention;
FIG. 3 is a schematic block diagram of step S2 of a method for collecting handwritten answer regions in a test paper according to an embodiment of the invention;
FIG. 4 is a schematic block diagram of step S3 of a method for collecting handwritten answer regions in a test paper according to an embodiment of the invention;
FIG. 5 is a schematic block diagram of step S4 of a method for collecting handwritten answer regions in a test paper according to an embodiment of the invention;
fig. 6 is a schematic block diagram of step S5 of a method for collecting a handwritten answer area in a test paper according to an embodiment of the invention.
Description of the embodiments
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present invention and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.
Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present invention will be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the term "plurality" shall mean two as well as more than two.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
Examples
Referring to fig. 1-6, the present invention provides a method for collecting a handwriting answer area in a test paper, comprising the following steps:
s1, reserving an identification code, reserving the position of the identification code in the exercise or test paper when the exercise or test paper is generated, covering the area corresponding to the area needing to be responded by students with a rectangular frame with special colors, and generating a test paper picture.
S1 comprises the following steps:
s1.1, setting an identification code, reserving the position of the identification code in a test paper when the test paper is generated, setting the identification code to be square, setting the position to the left side of each title, and setting the identification code to be a two-dimensional code;
s1.2, covering rectangular frames on the answering area, and distinguishing the answering areas of the questions by using rectangular frames with different colors according to the types of the questions answered by students, wherein the questions with the same type adopt rectangular frames with the same color.
S2, identifying the rectangular frame, scanning the generated test paper picture, identifying the rectangular frame with the special color, and acquiring the position information of the rectangular frame in the test paper.
The step S2 comprises the following steps:
s2.1, acquiring a test paper image, and reading the image obtained by scanning the test paper into a system;
s2.2, acquiring rectangular frame information, identifying the rectangular frame with special color by using an opencv image processing method, and acquiring the position information of the rectangular frame in the test paper, wherein the position information comprises the bit value of the rectangular center point in the test paper image, and the width and the height of the rectangle.
S3, filling in the content of the identification code, and recording the id information of the questions and the position information of the rectangular frame in the identification code.
The step S3 comprises the following steps:
s3.1, question information, wherein a teacher selects a question in a question bank, each question in the question bank is provided with a unique id in a database, and the id is set as a 32-bit hexadecimal character string;
s3.2, marking the position information of the reserved identification code in the image, setting the coordinates of the center of the identification code in the image as (X, Y), setting the height of the identification code as H and setting the width of the identification code as W;
s3.3, marking the position information of each rectangular frame, setting the coordinates of the center of the rectangular frame in the image as (X ', Y'), setting the height of the rectangular frame as H ', and setting the width of the rectangular frame as W';
s3.4, inputting information in the identification codes, and setting only one corresponding identification code for one title.
S4, uploading the picture, after the student answers, scanning the test paper, identifying and analyzing the identification code in the scanned image, and then using the analyzed content, and cutting the answer area of the student on the test paper picture in a form of outwards expanding the rectangular frame by 25%.
S4 comprises the following steps:
s4.1, scanning the test paper, after the student finishes answering, uniformly collecting the test paper by a teacher, and then obtaining pictures of the test paper through photographing or scanning;
s4.2, identifying and analyzing the identification code, positioning the identification code by using a digital image processing technology and analyzing the content in the picture;
s4.3, cutting an answer area, namely cutting the answer area of the student on the test paper picture according to the analyzed content in a form of outwards expanding 25% of a rectangular frame, and marking a handwritten text area by using a text detection module EAST when cutting the answer area, and storing a cut image, wherein the outwards expanding 25% of the rectangular frame is respectively expanding 25% of the side line of the rectangular frame up, down, left and right.
It should be understood that the relative position information of each rectangular frame includes four components, which are (X '-X)/(H), (Y' -Y)/(H, H '/(H, W'/(W), respectively), and the calculated result is sequentially added to the identification code in order.
S5, processing the image, and performing image processing operation on the cut answer area after cutting is completed to accurately acquire the answer area of the student; after the area including the student response information is cut out, the cut picture is processed using a digital image processing operation.
The cut image processing operation includes the steps of:
s5.1, clearing the white area, and clearing the white area around the student response information area;
s5.2, clearing the context area, and clearing the context information of the title outside the handwriting text area.
Examples
Before examination, a teacher scans a test paper with an identification code and a rectangular frame by using a scanner, recognizes the rectangular frame, acquires the position of the rectangular frame in the test paper, when examination is performed, a student answers in the rectangular frame, after the answer is finished, the teacher uniformly folds the test paper, then the test paper is scanned by the scanner and uploaded to a computer, the identification code is positioned and analyzed by using a digital image processing technology, the answer area of the student is cut on the test paper picture in a form of expanding the rectangular frame outwards by 25% by using the analyzed content, the cut image is saved, the cut rectangular area comprises the answer information of the student and possibly other interference information such as surrounding white area or context information, at the moment, the cut image is required to be subjected to digital image processing operation, the answer area of the student is accurately acquired, and then the teacher uses the computer to objectively and automatically modify the test paper of the student and subject electronic paper according to different colors of the rectangular frame.
After the test paper is scanned, the test paper picture is uploaded to a picture of a computer and is processed by a digital image processing system, other information except answer information is removed, when a teacher needs to ask for a doctor or has heavy tasks, other teachers can automatically correct objective questions answered by students through the computer due to the design of the identification codes and the special-color rectangular frames, and can search id information of the questions through the identification codes to search correct answers of the subjective questions in a question bank, so that the electronic examination of the subjective questions answers of the students by other teachers is facilitated.
In summary, by adding the identification code, the information of the student for answering is further obtained, so that automatic correction of objective questions and electronic examination paper of subjective questions can be conveniently carried out later; the cost is low, the popularization is easy, the process can be realized only by placing the identification code on the left side of the question, an answer sheet is not required to be appointed for exercise or test paper, the resource is saved, and the environment is protected; the system has the advantages that no modification is made on the answer area, the influence on the answer habit of students, such as choice of blank-filling habit brackets, blank-filling habit underlining and the like, is avoided, and meanwhile, the system can also process the situation of answering after correction, so that the system has certain robustness; the method has the advantages that the information of the student answer is further obtained by adding the identification code, so that automatic correction of objective questions and electronic examination papers of subjective questions can be conveniently carried out later; by expanding the rectangular frame, when the writing content of the student exceeds the answer range, the input of the answer area can be realized, and the influence on the score is avoided.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The method for collecting the handwriting answer area in the test paper is characterized by comprising the following steps:
s1, reserving an identification code, namely reserving the position of the identification code in the exercise or test paper when the exercise or test paper is generated, covering a region which corresponds to the region which needs to be responded by students with a rectangular frame with a special color, and generating a test paper picture;
s2, identifying a rectangular frame, scanning the generated test paper picture, identifying the rectangular frame with a special color, and acquiring the position information of the rectangular frame in the test paper;
s3, filling in the content of the identification code, and recording the id information of the questions and the position information of the rectangular frame together in the identification code;
s4, uploading pictures, after the students answer, scanning the test paper, identifying and analyzing the identification codes in the scanned images, and then cutting an answer area of the students on the test paper picture in a form of outwards expanding a rectangular frame by 25% by utilizing the analyzed contents;
s5, processing the image, and performing image processing operation on the cut answer area after cutting is completed, so as to accurately acquire the answer area of the student.
2. The method for collecting handwritten answer areas in a test paper according to claim 1, wherein S1 comprises the steps of:
s1.1, setting an identification code, reserving the position of the identification code in a test paper when the test paper is generated, setting the identification code to be square, setting the position to the left side of each title, and setting the identification code to be a two-dimensional code;
s1.2, covering rectangular frames on the answering area, and distinguishing the answering areas of the questions by using rectangular frames with different colors according to the types of the questions answered by students, wherein the questions with the same type adopt rectangular frames with the same color.
3. The method for collecting handwritten answer areas in a test paper according to claim 1 or 2, wherein said S2 comprises the steps of:
s2.1, acquiring a test paper image, and reading the image obtained by scanning the test paper into a system;
s2.2, acquiring rectangular frame information, identifying the rectangular frame with special color by using an opencv image processing method, and acquiring the position information of the rectangular frame in the test paper, wherein the position information comprises the bit value of the rectangular center point in the test paper image, and the width and the height of the rectangle.
4. The method for collecting handwritten answer regions in a test paper according to claim 3, wherein said S3 comprises the steps of:
s3.1, question information, wherein a teacher selects a question in a question bank, each question in the question bank is provided with a unique id in a database, and the id is set as a 32-bit hexadecimal character string;
s3.2, marking the position information of the reserved identification code in the image, setting the coordinates of the center of the identification code in the image as (X, Y), setting the height of the identification code as H and setting the width of the identification code as W;
s3.3, marking the position information of each rectangular frame, setting the coordinates of the center of the rectangular frame in the image as (X ', Y'), setting the height of the rectangular frame as H ', and setting the width of the rectangular frame as W';
s3.4, inputting information in the identification codes, and setting only one corresponding identification code for one title.
5. The method for collecting handwritten answer areas in a test paper according to claim 1, wherein said S4 comprises the steps of:
s4.1, scanning the test paper, after the student finishes answering, uniformly collecting the test paper by a teacher, and then obtaining pictures of the test paper through photographing or scanning;
s4.2, identifying and analyzing the identification code, positioning the identification code by using a digital image processing technology and analyzing the content in the picture;
s4.3, cutting an answer area, cutting the answer area of the student on the test paper picture according to the analyzed content and the outward expansion of the rectangular frame by 25%, and storing the cut image.
6. The method of claim 5, wherein the rectangular frame is expanded outward by 25% for each of the upper, lower, left, and right sides of the border of the rectangular frame.
7. The method of claim 5 or 6, wherein the text detection module EAST is used to mark the handwritten text area when the answer area is cut in S4.3.
8. The method for collecting handwritten answer areas in test paper according to claim 7, wherein in S5, after cutting out the area including student answer information, the cut pictures are processed using a digital image processing operation.
9. The method for collecting handwritten answer areas in a test paper according to claim 8, wherein in S5, the cutting image processing operation includes the steps of:
s5.1, clearing the white area, and clearing the white area around the student response information area;
s5.2, clearing the context area, and clearing the context information of the title outside the handwriting text area.
10. The method of claim 6, wherein the relative position information of each rectangular frame includes four components, which are (X '-X)/(H), (Y' -Y)/(H, H '≡h, W' ≡w), and the calculated results are sequentially added to the identification codes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310241031.5A CN116486411A (en) | 2023-03-14 | 2023-03-14 | Method for collecting handwriting answer area in test paper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310241031.5A CN116486411A (en) | 2023-03-14 | 2023-03-14 | Method for collecting handwriting answer area in test paper |
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| Publication Number | Publication Date |
|---|---|
| CN116486411A true CN116486411A (en) | 2023-07-25 |
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| CN202310241031.5A Pending CN116486411A (en) | 2023-03-14 | 2023-03-14 | Method for collecting handwriting answer area in test paper |
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| CN (1) | CN116486411A (en) |
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- 2023-03-14 CN CN202310241031.5A patent/CN116486411A/en active Pending
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