CN114707188A - CAD scoring method, intelligent terminal and computer readable storage medium - Google Patents
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Abstract
The invention provides a CAD scoring method, an intelligent terminal and a computer readable storage medium, wherein the scoring method comprises the following steps: s101: pre-storing the information of the key information points into preset data, wherein the preset data comprises test paper and reference answers; s102: after the objects to be evaluated corresponding to the preset data are obtained, merging the user operation objects according to the merging information among the same type of user operation objects in the objects to be evaluated; s103: and matching and comparing the reference answers with the objects to be scored according to errors of the user operation objects and the key information points, and acquiring score information based on comparison results. The invention realizes the automatic examination paper marking and scoring of the examination paper, has small workload and high accuracy and promotes the effective operation of CAD teaching.
Description
Technical Field
The invention relates to the technical field of CAD, in particular to a CAD scoring method, an intelligent terminal and a computer readable storage medium.
Background
CAD is an acronym of computer aided design (computer aideddesign) that helps designers perform their design work using a computer and its graphics device. In design, a computer is usually used for carrying out a large amount of calculation, analysis and comparison on different schemes so as to determine the optimal scheme; various design information, whether digital, literal or graphical, can be stored in the internal or external memory of the computer and can be quickly searched; designers usually start designing by using sketches, and the heavy work of changing the sketches into working drawings can be finished by a computer; the design result automatically generated by the computer can draw the graph quickly, so that the designer can make judgment and modification on the design in time; the graphic data processing work related to editing, enlarging, reducing, translating, copying, rotating, etc. of the graphic can be performed by the computer.
Based on the above characteristics of CAD, it is used as a mandatory lesson for many colleges and universities in university education. In the CAD teaching, in order to assess the CAD grasping condition of a student, an examination needs to be performed. In the prior art, the examination mode is that a teacher edits a test paper of a CAD examination on a computer, students operate the CAD on the computer to answer questions, and the teacher adopts a manual examination mode for examination paper examination.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a CAD scoring method, an intelligent terminal and a computer readable storage medium, data of key information points are stored in a test paper and a reference answer in advance, after an object to be scored is obtained, user operation objects are cleaned and merged uniformly, after merging, on the basis of the error requirements of the user operation objects and the key information points, correct and wrong information in a user answer test paper is obtained, so that the information is utilized to obtain the scoring of the test paper, the automatic paper marking and scoring of the test paper are realized, the workload is small, the accuracy is high, and the effective performance of CAD teaching is promoted.
In order to solve the above problems, the present invention adopts a technical solution as follows: a CAD scoring method, comprising: s101: pre-storing the information of the key information points into preset data, wherein the preset data comprises test paper and reference answers; s102: after the objects to be evaluated corresponding to the preset data are obtained, merging the user operation objects according to the merging information among the same type of user operation objects in the objects to be evaluated; s103: and matching and comparing the reference answer with the object to be scored according to the errors of the user operation object and the key information point, and acquiring score information based on a comparison result.
Further, the step of pre-storing the information of the key information point into the preset data specifically includes: and in the stage of inputting the standard answers, inputting the information into a data structure of the reference answers, and in the stage of inputting the test paper, inputting the information into a data structure of the test paper.
Further, the step of merging the user operation objects according to the merging information between the similar user operation objects in the objects to be scored specifically includes: and acquiring the user operation objects in the objects to be evaluated, merging and judging the user operation objects according to the classification of the user operation objects, and merging the merged user operation objects based on the judgment result.
Further, the step of matching and comparing the reference answer with the object to be scored according to the error of the user operation object and the key information point specifically includes: matching and comparing the object to be scored and the user operation object in the reference answer according to the classification and the error of the user operation object; and acquiring the reference answers and key information points in the object to be evaluated, and acquiring matching information of the reference answers and the key information points in the object to be evaluated based on errors of the key information points.
Further, the step of matching and comparing the object to be scored and the user operation object in the reference answer according to the classification and the error of the user operation object specifically includes: and acquiring matching information of the user operation objects in the objects to be scored and the reference answers according to the classification of the user operation objects, and matching and comparing the user operation objects based on the matching information and the errors.
Further, the step of obtaining the reference answer and the matching information of the key information points in the object to be scored based on the error of the key information points specifically includes: and acquiring coordinates of the key information points, and matching and comparing the reference answers and the key information points in the object to be evaluated based on the coordinates and the errors.
Further, the step of obtaining score information based on the comparison result specifically includes: and acquiring correct information and error information of the object to be scored according to the comparison result, and acquiring score information based on the correct information and the error information and a preset scoring rule.
Based on the same inventive concept, the invention further provides an intelligent terminal, which comprises a processor and a memory, wherein the memory stores a computer program, the processor is in communication connection with the memory, and the processor executes the CAD scoring method through the computer program.
Based on the same inventive concept, the present invention also proposes a computer-readable storage medium storing program data for performing the CAD scoring method as described above.
Compared with the prior art, the invention has the beneficial effects that: the method comprises the steps of storing data of key information points in test paper and reference answers in advance, uniformly cleaning and combining user operation objects after obtaining objects to be scored, comparing the user operation objects and the key information points one by one after combination based on error requirements of the user operation objects and the key information points, and obtaining correct and wrong information in user answer test paper, so that scoring of the test paper is obtained, automatic paper marking and scoring of the test paper are achieved, the workload is small, the accuracy is high, and effective implementation of CAD teaching is promoted.
Drawings
FIG. 1 is a flowchart of one embodiment of a CAD scoring method of the present invention;
FIG. 2 is a flowchart of one embodiment of segment merging in the CAD scoring method of the present invention;
FIG. 3 is a flowchart of an embodiment of line segment comparison in the CAD scoring method of the present invention;
FIG. 4 is a diagram illustrating an embodiment of a topic graphic of a test paper in the CAD scoring method of the present invention;
FIG. 5 is a diagram of one embodiment of a topic and standard answer graph in the CAD scoring method of the present invention;
FIG. 6 is a diagram illustrating an embodiment of a topic and student answers in the CAD scoring method of the present invention;
FIG. 7 is a schematic diagram illustrating an embodiment of error labeling in the CAD scoring method of the present invention;
FIG. 8 is a block diagram of an embodiment of an intelligent terminal according to the present invention;
fig. 9 is a block diagram of an embodiment of a computer-readable storage medium of the present invention.
Detailed Description
The following description of the embodiments of the present application is provided by way of specific examples, and other advantages and effects of the present application will be readily apparent to those skilled in the art from the disclosure herein. The present application is capable of other and different embodiments and its several details are capable of modifications and/or changes in various respects, all without departing from the spirit of the present application. It should be noted that the various embodiments of the present disclosure, described and illustrated in the figures herein generally, may be combined with each other without conflict, and that the structural components or functional modules therein may be arranged and designed in a variety of different configurations. Thus, the following detailed description of the embodiments of the present disclosure, presented in the figures, is not intended to limit the scope of the claimed disclosure, but is merely representative of selected embodiments of the disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
The terminology used in the description of the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1 to 7, fig. 1 is a flowchart illustrating a CAD scoring method according to an embodiment of the invention; FIG. 2 is a flowchart of one embodiment of segment merging in the CAD scoring method of the present invention; FIG. 3 is a flowchart of an embodiment of line segment comparison in the CAD scoring method of the present invention; FIG. 4 is a diagram illustrating an embodiment of a topic graphic of a test paper in the CAD scoring method of the present invention; FIG. 5 is a diagram of one embodiment of a topic and standard answer graph in the CAD scoring method of the present invention; FIG. 6 is a diagram illustrating an embodiment of a topic and student answers in the CAD scoring method of the present invention; fig. 7 is a schematic diagram illustrating an embodiment of error labeling in the CAD scoring method of the present invention. The CAD scoring method of the present invention is described in detail with reference to fig. 1 to 7.
In this embodiment, the device for executing the CAD scoring method may be a laptop, a desktop, a server, a mobile phone, a tablet computer, or other intelligent terminals capable of loading CAD files.
The CAD scoring method comprises the following steps:
s101: and pre-storing the information of the key information points into preset data, wherein the preset data comprises test paper and reference answers.
In this embodiment, the step of pre-storing the information of the key information point in the preset data specifically includes: and in the stage of inputting the standard answers, inputting the information into the data structure of the reference answers, and in the stage of inputting the test paper, inputting the information into the data structure of the test paper.
The key information points are position points related to scoring when the students answer questions, the key information points comprise data points such as foot drop points, tangent points and middle points in the CAD graph, and specific types and numbers can be set according to requirements of question makers.
In a specific embodiment, the intelligent terminal is a computer, and when the question person enters the standard answer and the test paper, the question person inputs the information of the key information points (such as the foot drop points), and the computer stores the information into the data structures of the standard answer and the test paper respectively.
S102: and after the objects to be evaluated corresponding to the preset data are obtained, merging the user operation objects according to the merging information among the same type of user operation objects in the objects to be evaluated.
In this embodiment, the object to be scored is an answer sheet of a student, and after the scoring personnel starts the paper marking function, the intelligent terminal reads the answer sheet of the student, and pre-processes and checks the answer sheet to uniformly clean, merge and simplify the user operation objects on the answer sheet, so that the problem that the standard answer is consistent with the visual effect of the answer sheet result of the student, but the bottom layer data structure is inconsistent to cause a scoring error is avoided. For example, the standard answer should be a long line segment (0,0) - > (100 ), and the student draws two short straight lines (0,0) - > (50,50) and (50,50) - > (100 ), respectively, which should be judged to be correct, but since the underlying data structures are not consistent, the direct comparison may be judged to be wrong, and thus the score is not accurate.
The step of merging the user operation objects according to the merging information among the same type of user operation objects in the objects to be scored specifically comprises the following steps: and acquiring the user operation objects in the objects to be evaluated, merging and judging the user operation objects according to the classification of the user operation objects, and merging the merged user operation objects based on the judgment result.
In the present embodiment, the classification of the user operation object includes a line segment, a circular arc, a circle, an ellipse, a spline curve, and a mark point. Because some line segments are combined into rectangles or polygons, the rectangles and the polygons need to be broken up to obtain the line segments when the line segments are obtained.
Specifically, the step of performing merging judgment on the user operation objects according to the classification of the user operation objects includes: and acquiring merging rules corresponding to the classifications, and judging whether the similar user operation objects with coincidence are merged or not according to the merging rules, wherein different classifications correspond to different merging rules.
In this embodiment, the rule of merging the line segments is that the line segments are collinear, and if there is an overlapping part and the line segments have the same style, the line segments are merged; merging if the circle centers are consistent, overlapped parts exist and line segment patterns are the same according to the merging rule of the circles; combining ellipses if the centers of the ellipses are consistent, overlapped parts exist and the line segment patterns are the same; the merging rule of the marking points is to merge overlapped marking points.
The line segment patterns include solid lines, broken lines, dot-dash lines, double-dot-dash lines, and the like.
In a preferred embodiment, the manner of determining whether the two line segments are collinear and overlapped is as follows: and calculating the values of three parameters ABC in the expression Ax + By + C =0 of all the line segments, and judging that the two line segments are collinear when the three parameters calculated By the two line segments are consistent. The two line segments are collinear, and a determination is made as to whether there is an overlap by determining whether at least one of the two endpoints of the second line segment is on the first line segment (with accuracy problems). Calculating a vector formula of the line segment under two-dimensional coordinates: EndPoint = StartPoint + Delta T, where EndPoint: end point coordinates of line segment, StartPoint: coordinates of the start point of the line segment, Delta: vector where line segment direction vectors are parallel, T: the relation between the actual vector of the line segment and Delta. The relationship of the end points and the line segments is then judged by the above formula: line1EndPoint = line1StartPoint + Delta2 × T1, Delta1= Delta2 × T1. Two end points of the line segment 2 and startPoint of the line segment 1 form two new line segments:
Line2StartPoint=Line1StartPoint+Delta1*T2
Line2EndPoint=Line1StartPoint+Delta1*T3
t2 and T3 are calculated, and if T2 and the difference value between T3 is 0-1 (other accuracy ranges can be also used), the fact that the two line segments are overlapped is determined.
In this embodiment, the same merging rule is used for the circle and the circular arcs, so that all the circles need to be converted into circular arcs before merging judgment is performed on the circles, and merging judgment is performed on the converted circular arcs.
S103: and matching and comparing the reference answers with the objects to be scored according to errors of the user operation objects and the key information points, and acquiring score information based on comparison results.
The accuracy rule of the student answer sheet and the standard answer requires that the student answer sheet and the standard answer are inconsistent under different conditions. For example, assuming that the subject is a student who needs to draw a line segment, this typically allows the standard answer to be about 5% different from the student's drawn result. But if the title requires that a line segment must be perpendicular to another line segment without allowing any deviation, the accuracy error requirement for rendering the result in this case is reduced by up to 0.1%. Conventional approaches fail to achieve this differential accuracy. The problem that the difference accuracy is difficult to meet by using uniform errors is solved by scoring based on the errors of the user operation objects.
In this embodiment, the step of matching and comparing the reference answer with the object to be scored according to the error of the user operation object and the key information point specifically includes: matching and comparing the objects to be scored and the user operation objects in the reference answers according to the classification and the error of the user operation objects; and acquiring the reference answers and the key information points in the object to be evaluated, and acquiring the matching information of the reference answers and the key information points in the object to be evaluated based on the errors of the key information points.
The step of matching and comparing the objects to be scored and the user operation objects in the reference answers according to the classification and the error of the user operation objects specifically comprises the following steps: and acquiring matching information of the objects to be scored and the user operation objects in the reference answers according to the classification of the user operation objects, and matching and comparing the user operation objects based on the matching information and the errors.
In a specific embodiment, the user operation objects of different classifications are matched and compared based on the same error, and the intelligent terminal performs classification and comparison on the contents of line segments, circular arcs, ellipses, spline curves, marking points and the like respectively after combining the user operation objects in the answer sheet. The alignment process may be allowed 5% error. The specific comparison mode comprises the following steps: and comparing the coordinates of the starting point and the ending point of the two lines by the line segment. And comparing the circular arc with the circle center coordinate, the radius length, the radian starting point and the radian ending point. And comparing the center coordinates and the radius length of the ellipse. The spline compares each anchor point coordinate. And comparing the coordinates of the marking points and marking characters by the marking points. Wherein, the comparison process of the line segments comprises the following steps: and inquiring the starting point coordinates and the end point coordinates of all line segments in the standard answers, and comparing the starting point coordinates and the end point coordinates with the coordinates of all line segments in the answer sheet respectively. And judging whether a line segment with consistent coordinates exists in the answer sheet, if so, determining the line segment with consistent coordinates as a correct line segment, counting the number of the correct line segments, if not, determining that the correct line segment does not exist, and ending the operation. The circular arc, ellipse, spline curve and annotation point contrast flow is similar to the line segment.
The step of obtaining the reference answer and the matching information of the key information points in the object to be scored based on the errors of the key information points specifically comprises the following steps: and acquiring coordinates of the key information points, and matching and comparing the reference answers and the key information points in the object to be evaluated based on the coordinates and the errors.
In a specific embodiment, the key information points pre-stored in the standard answers are compared with the key information points in the answer sheet. If the standard answer includes these points, the answer sheet should also include these points, which may have 5% error in their specific coordinates, but which must be included in the answer sheet. The key information points specifically include: the vertical feet of the line segments, the tangent points of the line segments and the circular arcs, and the middle points of the line segments and the line segments. And acquiring the correct information such as the number, the position, the name and the like of the key information points according to the comparison result.
In this embodiment, the step of obtaining score information based on the comparison result specifically includes: and acquiring correct information and error information of the object to be scored according to the comparison result, and acquiring score information based on the correct information and the error information and a preset scoring rule. Wherein, the scoring rule also comprises a scoring standard, and the scoring is carried out by combining the scoring standard.
Please refer to table one, which is a scoring rule table of the present invention,
table one, scoring rule table
In a specific embodiment, the preset scoring rule includes a weight, the matching result is output as a detailed log after being obtained, and the score is calculated according to the preset weight. The detailed log comprises standard answer information, the total number of graphs of the standard answers, the number of graphs needing to be drawn, the number of graphs which are drawn completely, the number of graphs which are not drawn, graph information drawn by students (answerers), the total number of graphs drawn by the students, the number of graphs which are drawn wrongly, and the like.
In a preferred embodiment, the scoring rules include: if: the number of lines drawn by students is less than or equal to the number of lines to be drawn, and the student score is = (logarithm of answer ÷ number of lines to be drawn) × the question is full. If: the number of lines drawn by students is larger than the number of lines to be drawn, and the score of the students is = (answer pair number divided by the number of lines drawn by the students) the score of the question is full. Example (c): the number of lines to be drawn is 5, the number of lines drawn by students is 5, the number of answer pairs is 4, and the question fullness is 10 minutes. Student score = (4/5) × 10=8 (points).
The CAD scoring method of the present invention is further described below in conjunction with fig. 4-7.
The CAD scoring method can be used for WebCAD scoring, realizes a WebCAD evaluating system, enables student test papers to be scored correctly, and realizes automatic paper marking. A simple graphic case is taken as an example to illustrate the model comparison process:
1) the test paper and standard answer are recorded, the generated data is recorded in exa, the graph of the question and the standard answer has three circles recorded under answer, the type is arc, the graph of the question of the test paper has two circles recorded under query, and the type is arc.
2) The student screens the questions in the question bank according to the catalog, clicks 'select', then clicks 'select question', and can enter a question making page. The student answers are recorded, generated data are recorded in an answer, and a student answer graph is provided with four line segments and is of a line type. In order to facilitate student answering, the question stem of the question is provided with three buttons, namely 'collection', 'reference answer' and 'error marking'. Clicking the 'error label' to pop up an error label page, displaying the 'number of line segments needing to be drawn' and the 'number of correct lines', wherein the omitted drawing lines are shown in gray, and the lines which are wrongly drawn are shown in yellow.
3) The evaluation is only performed on the same type of graph, e.g. lines are only compared to lines, lines are not compared to circles. The missing line is displayed in gray, and the line drawn in error is displayed in yellow. Wherein clicking the "reference answer" pops up the reference answer and the 3D model.
Based on the same inventive concept, the present invention further provides an intelligent terminal, please refer to fig. 8, wherein fig. 8 is a structural diagram of an embodiment of the intelligent terminal of the present invention. The intelligent terminal of the present invention is described in detail with reference to fig. 8.
In this embodiment, the intelligent terminal includes a processor and a memory, the memory stores a computer program, the processor is connected in communication with the memory, and the processor executes the CAD scoring method according to the above embodiment through the computer program.
Based on the same inventive concept, the present invention further provides a computer-readable storage medium, please refer to fig. 9, fig. 9 is a structural diagram of an embodiment of the computer-readable storage medium of the present invention, and the computer-readable storage medium of the present invention is described with reference to fig. 9.
In the present embodiment, a computer-readable storage medium stores program data used to execute the CAD scoring method as described in the above embodiments.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A CAD scoring method, wherein said CAD scoring method comprises:
s101: pre-storing the information of the key information points into preset data, wherein the preset data comprises test paper and reference answers;
s102: after the objects to be evaluated corresponding to the preset data are obtained, merging the user operation objects according to the merging information among the same type of user operation objects in the objects to be evaluated;
s103: and matching and comparing the reference answer with the object to be scored according to the errors of the user operation object and the key information point, and acquiring score information based on a comparison result.
2. The CAD scoring method according to claim 1, wherein the step of pre-storing the information of the key information points in the preset data specifically comprises:
and in the stage of inputting the standard answers, inputting the information into a data structure of the reference answers, and in the stage of inputting the test paper, inputting the information into a data structure of the test paper.
3. The CAD scoring method according to claim 1, wherein the step of merging the user operation objects according to the merging information between the user operation objects of the same class in the objects to be scored specifically comprises:
and acquiring the user operation objects in the objects to be evaluated, merging and judging the user operation objects according to the classification of the user operation objects, and merging the merged user operation objects based on the judgment result.
4. The CAD scoring method according to claim 1, wherein the step of matching and comparing the reference answer with the object to be scored according to the error of the user operation object and the key information point specifically comprises:
matching and comparing the object to be scored and the user operation object in the reference answer according to the classification and the error of the user operation object;
and acquiring the reference answers and key information points in the object to be evaluated, and acquiring matching information of the reference answers and the key information points in the object to be evaluated based on errors of the key information points.
5. The CAD scoring method according to claim 4, wherein the step of matching and comparing the object to be scored and the user operation object in the reference answer according to the classification and the error of the user operation object specifically comprises:
and acquiring matching information of the user operation objects in the objects to be scored and the reference answers according to the classification of the user operation objects, and matching and comparing the user operation objects based on the matching information and the errors.
6. The CAD scoring method according to claim 4, wherein the step of obtaining matching information of the reference answer and the key information points in the object to be scored based on the errors of the key information points specifically comprises:
and acquiring coordinates of the key information points, and matching and comparing the reference answers and the key information points in the object to be evaluated based on the coordinates and the errors.
7. The CAD scoring method according to claim 1, wherein the step of obtaining score information based on the comparison result specifically includes:
and acquiring correct information and error information of the object to be scored according to the comparison result, and acquiring score information based on the correct information and the error information and a preset scoring rule.
8. An intelligent terminal, characterized in that the intelligent terminal comprises a processor, a memory, the memory storing a computer program, the processor being connected in communication with the memory, the processor executing the CAD scoring method according to any one of claims 1-7 through the computer program.
9. A computer-readable storage medium, characterized in that the computer-readable storage medium stores program data for performing the CAD scoring method according to any one of claims 1-7.
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| CN115544594A (en) * | 2022-09-20 | 2022-12-30 | 杭州宏深科技有限公司 | General automatic batch three-dimensional CAD modeling scoring method |
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| CN106142889A (en) * | 2015-04-08 | 2016-11-23 | 季争鸣 | A kind of answering card goed over examination papers for automatic scanning and application process thereof |
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