JP2020013282A - Information processing device and program - Google Patents

Abstract

To provide an information processing device capable of suitably detecting an answer column provided in an answer sheet, and a program.SOLUTION: A control unit 15: sets whether a blank image Im1 and a correct answer entry image Im2 were acquired from a scanner 2 (step S101); identifies a description location displayed in the correct answer entry image Im2 by calculating a difference between the blank image Im1 and the correct answer entry image Im2 (step S102); detects a rectangular frame surrounding the description location identified by the step S102 as an answer column in the correct answer entry image Im2 (step S103); and sets an answer abstraction field for abstracting an answer per question on the basis of an answer column per abstracted question (step S104).SELECTED DRAWING: Figure 5

Description

  The present invention relates to a technique for automatically extracting an answer column.

  2. Description of the Related Art Conventionally, there has been known a technique in which a student's test answer is displayed on a screen of a terminal used by a teacher to score. For example, Patent Literature 1 discloses a scoring system that acquires handwriting information entered by a student in an answer column of an answer sheet, displays the information on a screen of a terminal used by a teacher, and receives an input of correctness determination. Further, Patent Literature 2 discloses a technique of comparing an answer entered with an electronic pen with a correct answer and determining whether the answer is correct or not.

JP 2014-134854 A JP 2009-3227 A

  When the teacher creates the test by himself, the system recognizes the answer section that the student has filled in the answer box of the answer sheet using the electronic pen or tablet, etc., by manually inputting the position of each answer box in advance to the system. It had to be entered and this manual input was troublesome for the teacher.

  The present invention has been made to solve the above problems, and has as its main object to provide an information processing apparatus and a program capable of suitably detecting an answer column provided on an answer sheet. And

  In one aspect of the present invention, the information processing apparatus includes a first image representing an answer sheet of a test whose answer column is blank, and a second image representing an answer sheet of the test described in the answer column. An acquisition unit for acquiring, and a detection unit for detecting the answer column in the first image and the second image based on a difference between the first image and the second image. The tests here include exercises, review tests, effect measurement, and the like, which are performed with the advice of the teacher during class. The difference between the first image representing the answer sheet with an empty answer column and the second image representing the answer sheet described in the answer column is the location to be entered in the answer column. The answer column in which the answer is to be entered can be accurately detected based on the position where is present.

  In one aspect of the information processing apparatus, the detection unit detects, as the answer column, a rectangular frame that surrounds the described difference portion among the rectangular frames present in the first image and the second image. According to this aspect, the information processing apparatus can appropriately detect a rectangular frame described in the second image as an answer column.

  In another aspect of the information processing device, the detection unit detects the answer column based on a size of the rectangular frame. According to this aspect, the information processing apparatus can further improve the accuracy of detecting the answer column.

  In another aspect of the information processing apparatus, the information processing apparatus further includes a correct answer information obtaining unit configured to obtain correct answer information to be entered in the answer column from the second image. In a preferred example, the correct answer information obtaining means may obtain the correct answer information by performing character recognition on an image in the answer column in the second image. According to this aspect, the information processing apparatus can appropriately acquire correct answer information to be entered in each answer column.

  In another aspect of the information processing apparatus, the information processing apparatus includes, based on the answer column detected by the detection unit, a setting unit that sets an answer extraction area for extracting a handwriting of an answer written in the answer column. Furthermore, the obtaining means obtains a third image representing an answer sheet of the test in which an answer is made, and the detecting means displays a handwriting in the answer extraction area in the third image in the answer column. Detect as the entered answer. According to this aspect, the information processing apparatus sets the answer extraction area based on the detected answer column, and can appropriately detect the handwriting of the answer in the answer sheet to which the answerer has answered.

  In another aspect of the information processing apparatus, the setting unit sets a region larger than the answer column detected by the detecting unit and including the answer column as the answer extraction region. According to this aspect, the information processing apparatus can also appropriately recognize a handwriting protruding and written in an actual answer column as an answer.

  In another aspect of the information processing device, the information processing device may include a designated one answer column when the acquisition unit acquires the third image representing the answer sheet answered by each of a plurality of answerers. And a display unit for displaying handwriting in the answer extraction area of each of the third images corresponding to the answer image together with correct answer information to be entered in the answer column. According to this aspect, the information processing apparatus can display a list of answers of a plurality of answerers to the designated question so that the answers can be compared with the correct answer.

  In another aspect of the information processing device, the information processing device is configured to provide each of the plurality of answerers described in the one answer column based on the handwriting in the answer extraction area and the correct answer information. The display means displays the handwriting in the answer extraction area and the result of the right / wrong judgment for the answer indicated by the handwriting. According to this aspect, the information processing apparatus can automatically perform the correct / incorrect determination of the answers of the plurality of answerers to the designated question, and can present the result to the user.

  In another aspect of the information processing apparatus, the information processing apparatus further includes an input accepting unit that accepts an input designating whether the handwriting in the answer extraction region cannot be determined by the determination unit. According to this aspect, an input designating correctness can be suitably received for an answer that could not be automatically scored due to a character recognition error or the like.

  In a preferred example, the acquisition unit is configured to read the first image and the second image from an optical device that has read an answer sheet for a test in which the answer column is blank and an answer sheet for the test described in the answer column. Preferably, two images are acquired.

  In still another preferred embodiment of the present invention, a computer-executed program includes a first image representing an answer sheet for a test in which an answer column is blank, and an answer sheet for the test described in the answer column. An acquisition unit for acquiring a second image representing the first image and the second image, and a computer as a detection unit for detecting the answer column in the first image and the second image based on a difference between the first image and the second image. Function. The information processing apparatus according to the present invention can be configured by installing and executing this program on a computer.

  ADVANTAGE OF THE INVENTION According to the information processing apparatus which concerns on this invention, the answer column of an answer sheet can be automatically detected suitably, even when a teacher etc. create an answer sheet by himself.

1 shows a schematic configuration of a scoring system. It is an example of a blank answer sheet which is an answer sheet before a test answer is written. It is an example of a correct answer entry sheet which is an answer sheet in which a correct answer is entered in each answer column of a blank answer sheet. FIG. 2 is a block diagram illustrating a functional configuration of the information processing apparatus. It is a flowchart regarding the detection process of the answer column and the setting process of the answer extraction field. It is the figure which specified the answer extraction field with the broken line frame. It is a display example of a question selection screen. It is an example of a display of a scoring screen according to a question. It is an example of a mark sheet type correct answer sheet. 9 is a configuration example of a scoring system according to a modification.

  Hereinafter, preferred embodiments for carrying out the present invention will be described with reference to the drawings.

[Structure of scoring system]
FIG. 1 is a schematic configuration diagram of a scoring system according to the present embodiment. The scoring system according to the present embodiment includes an information processing apparatus 1 used by a grader of a test such as a teacher, a scanner (optical device) 2, a blank sheet 4 as an answer sheet for a test before use, and each answer column. Has an answer sheet 5 which is an answer sheet on which characters or marks indicating the correct answer are written, and a plurality of answer sheets 6 which are answer sheets used by each student who took the test. Then, the scoring system detects each answer column present in the blank sheet 4 and the correct answer entry sheet 5 based on the difference between the blank sheet 4 and the correct answer entry sheet 5, thereby suitably supporting the test scoring.

  The information processing apparatus 1 is electrically connected to the scanner 2 by wire or wirelessly. When the scanner 2 performs a reading process on the blank sheet 4, the correct answer entry sheet 5, and the answer completed sheet 6, these answer sheets are read. The scanned image is received from the scanner 2. Hereinafter, the image obtained by scanning the blank sheet 4 is referred to as “blank image Im1”, the image obtained by scanning the correct answer entry sheet 5 is referred to as “correct answer entry image Im2”, and the image obtained by scanning the answer completed sheet 6 is referred to as “answered image”. Im3 ". Then, the information processing device 1 detects each answer column in these images based on the blank image Im1 and the correct answer entry image Im2, and displays a screen regarding the scoring of the answer sheet 6 indicated by the answer image Im3 based on the recognition result. indicate. The blank image Im1 is an example of the “first image” in the present invention, the correct answer entry image Im2 is an example of the “second image” in the present invention, and the answered image Im3 is the “third image” in the present invention. "Is an example.

  FIG. 2 is an example of a blank sheet 4 which is an answer sheet before a test answer is entered. As shown in FIG. 2, the blank sheet 4 is provided with an answer column for entering an answer to each question in addition to a column for entering a student number and a name of a student to be tested.

  FIG. 3 is an example of a correct answer entry sheet 5 which is an answer sheet in which a correct answer is entered in each answer column of the blank sheet 4. As shown in FIG. 3, the correct answer to the corresponding question is written in each answer column of the correct answer entry form 5. The correct answer written on the correct answer entry form 5 may be a printed character or a handwritten character.

  Although FIGS. 2 and 3 show examples of the answer sheet for mathematics, the blank sheet 4 and the answer sheet 5 according to the present embodiment are the answer sheets for entering the answer of any subject other than mathematics. It may be. In addition, the blank sheet 4 and the correct answer entry sheet 5 may be an answer sheet on which both a question and an answer box are printed (that is, a question sheet with an answer box). Further, the blank sheet 4 and the correct answer entry sheet 5 may each be composed of a plurality of sheets.

[Configuration of Information Processing Device]
FIG. 4 is a block diagram illustrating a functional configuration of the information processing apparatus 1. The information processing apparatus 1 functionally includes a display unit 11 such as a display, an input unit 12 such as a touch panel, a mouse, and a keyboard, a storage unit 13, and an interface 14 for connecting to the scanner 2 by wire or wirelessly. , A control unit 15. These components are interconnected via a bus line 10.

  The storage unit 13 is configured by a memory such as a hard disk or a flash memory, and stores a program executed by the control unit 15 and information necessary for processing of the program.

  The control unit 15 includes a CPU, a ROM, a RAM, and the like (not shown), and performs various controls on each component in the information processing device 1.

  In the present embodiment, when the blank image Im1 and the correct answer entry image Im2 are received from the scanner 2, the control unit 15 analyzes these images to detect an answer column for each question. Then, the control unit 15 sets an area (also referred to as an "answer extraction field (area)") for extracting a student's answer to each question displayed on the answered image Im3 for each detected answer column. . As will be described later, the answer extraction field is set to be an area including the corresponding answer column.

  When the controller 15 receives the answered images Im3 of the respective students to be graded from the scanner 2, the controller 15 sets the answers of the respective students entered in the respective answer columns of the answered images Im3. It is extracted based on the answer extraction field, and is displayed on the display unit 11 for each question. Then, the control unit 15 receives, for example, an input regarding correctness determination of each answer through the input unit 12.

  The control unit 15 is an example of a “acquiring unit”, a “detecting unit”, a “setting unit”, a “determining unit”, an “input receiving unit”, a “correct answer information acquiring unit”, and a computer that executes a program in the present invention. .

[Answer column detection and answer extraction field setting]
First, an answer column detection process and an answer extraction field setting process will be described. FIG. 5 is a flowchart illustrating a processing procedure related to an answer column detection process and an answer extraction field setting process performed by the control unit 15. For example, the control unit 15 repeatedly executes the processing of the flowchart in FIG.

  First, the control unit 15 determines whether the blank image Im1 and the correct answer entry image Im2 have been acquired from the scanner 2 (step S101). If the control unit 15 determines that the blank image Im1 and the correct answer entry image Im2 have been acquired from the scanner 2 (step S101; Yes), the process proceeds to step S102. For example, when there is a user input for designating the blank image Im1 and the correct answer entry image Im2 from the images in the folder in which the image obtained from the scanner 2 is stored, the control unit 15 converts the blank image Im1 and the correct answer entry image Im2. It is determined that it has been acquired from the scanner 2. On the other hand, when at least one of the blank image Im1 and the correct answer entry image Im2 has not been acquired from the scanner 2 (step S101; No), the control unit 15 continues to perform the determination in step S101.

  Next, the control unit 15 calculates a difference between the blank image Im1 and the correct answer entry image Im2 to specify a description place (simply referred to as a “description place”) regarding the correct answer displayed on the correct answer entry image Im2. (Step S102). For example, the control unit 15 binarizes each pixel of the blank image Im1 and the correct answer entry image Im2 and determines whether or not there is a difference for each pixel, thereby specifying a pixel representing a description location in the correct answer entry image Im2.

  Next, in the correct answer entry image Im2, the control unit 15 detects a rectangular frame surrounding the description location specified in step S102 as an answer column (step S103). When the control unit 15 detects a plurality of rectangular frames surrounding the same description location, for example, the control unit 15 may detect the rectangular frame surrounding the target description location at the innermost side as the answer column. As a result, detection of a frame or the like for adjusting the appearance surrounding the plurality of answer columns as the answer column is preferably suppressed.

  In addition, in step S103, preferably, the control unit 15 extracts a rectangular frame whose vertical size and horizontal size are equal to or greater than the first predetermined length from among the rectangular frames surrounding the description location as the answer column. More preferably, the control unit 15 may extract a rectangular frame whose vertical size and horizontal size are equal to or greater than the first predetermined length and equal to or less than the second predetermined length from among the rectangular frames surrounding the description location as the answer column. . The above-mentioned first predetermined length is set to the length of the shortest horizontal size and vertical size assumed as an answer column, and the second predetermined length is the length of the longest horizontal size and vertical size assumed as an answer column. Is set to The first predetermined length and the second predetermined length may be set to different values for the horizontal size and the vertical size, respectively. According to these aspects, it is possible to reliably prevent a rectangular frame that is clearly too small or too large as an answer column from being detected as an answer column, and to extract the answer column more accurately.

  Next, the control unit 15 sets an answer extraction field for extracting an answer for each question based on the extracted answer field for each question (step S104). As described later, the answer extraction field is set to be larger than the area of the extracted answer column. Then, the control unit 15 stores the position information of the answer extraction field for each answer column (for example, the position information of the four corners of the answer extraction field when the answer sheet is represented by the two-dimensional coordinate system) in the storage unit 13. The information in the answer extraction field is suitably referred to in the display processing described later.

  FIG. 6 is a diagram in which the answer extraction field set in step S104 of FIG. 5 is clearly indicated on the correct answer entry image Im2 by a broken line frame.

  As shown in FIG. 6, the control unit 15 sets a region that is vertically and horizontally enlarged by a predetermined length from the detected answer column as an answer extraction field. Here, the column for entering the student number, the name column, and the column for displaying the sub-question numbers such as (1) and (2) are rectangular frames like the answer columns, but are not frames surrounding the description location. , Are not extracted as answer fields. Note that a scale line forming a rectangular frame is formed on the graph of the question “Question 3 (1)”. In this case, for example, the control unit 15 does not detect a rectangular frame whose horizontal size or vertical size is less than a predetermined length as an answer column. Thereby, the control unit 15 suitably suppresses erroneous detection of the scale line in the above-described graph as the answer column.

[Display example]
Next, a screen displayed on the display unit 11 after the control unit 15 acquires the answered image Im3 will be described. Here, the control unit 15 displays a screen for selecting a question to be graded (also referred to as a “question selection screen”) on the display unit 11, and then collectively scores the answers of the students to the selected question. (Also referred to as a “question-specific scoring screen”) on the display unit 11.

  FIG. 7 is a display example of a question selection screen. In this case, the control unit 15 displays the correct answer entry image Im2 and accepts selection of an arbitrary answer column in the correct answer entry image Im2. In this case, when detecting a click operation with a mouse or a touch operation with a touch panel on an answer extraction field set for each answer field, the control unit 15 highlights the answer field corresponding to the detected answer extraction field. indicate. In the example of FIG. 7, the control unit 15 detects that the answer column of “Question 2 (2)” has been selected, and highlights the answer column. Then, when the determination button 20 at the bottom of the screen is selected, the control unit 15 causes the display unit 11 to display a question-specific scoring screen.

  FIG. 8 is a display example of a question-specific scoring screen regarding the scoring of the answer column selected on the question selection screen of FIG. The control unit 15 includes a question number selection field 21, a correct answer display field 22, a student-specific answer field 23 (23A to 23C,...), And a right / wrong judgment button 24 ( 24A to 24C,...), Automatic scoring information 25 (25A to 25A,...), And a completion button 26 are displayed.

  Here, the question number selection column 21 is a column for specifying the question number of the answer column selected on the question selection screen of FIG. In the example of FIG. 8, the control unit 15 specifies the question number described in the blank image Im1 or the correct answer entry image Im2 by a character recognition process (OCR: Optical Character Recognition), so that a question number selection field in a pull-down menu format. 21 is displayed. Here, “Question 2 (2)” indicating the question number corresponding to the answer column selected on the question selection screen in FIG. 7 is selected based on the user input.

  The correct answer display section 22 displays the correct answer corresponding to the answer section selected on the question selection screen of FIG. The control unit 15 specifies, for example, an answer extraction field that includes the answer column selected on the question selection screen, then extracts a partial image of the correct answer entry image Im2 in the answer extraction field, and converts the extracted image into the correct answer. It is displayed in the display column 22. In this case, the control unit 15 may perform OCR on the extracted partial image of the correct answer entry image Im2 to recognize a character representing a correct answer, and display the recognized character in the correct answer display box 22. .

  The student-specific answer columns 23 (23A to 23C,...) Are columns in which the answers entered in the answer columns selected on the question selection screen in FIG. 7 are extracted from the respective answered images Im3 and displayed. After specifying the answer extraction field including the answer column selected on the question selection screen of FIG. 7, the control unit 15 extracts a partial image of each answered image Im3 in the answer extraction field, and extracts each extracted image. Is displayed in the answer column 23 for each student. In the example of FIG. 8, the control unit 15 performs, for example, a character recognition process of the student number displayed on the acquired answered image Im3 or the input of the student number by the input unit 12 so that the student Are displayed, and the student-specific answer columns 23 are vertically arranged in ascending order of the recognized student numbers. Here, since the answer extraction field is an area that is larger than the actual answer field, the answer that is written out of the answer field can be suitably displayed on the student-specific answer field 23.

  The correct / incorrect judgment buttons 24 (24A to 24C,...) Are buttons for designating correct or incorrect answers for each student entered in the answer column selected on the question selection screen in FIG. The right / wrong judgment buttons 24 (24A to 24C,...) Are composed of a set of a button displayed as “correct” and a button displayed as “error”, and the selected button is highlighted. When the automatic grading is performed, the button corresponding to the automatic grading result is highlighted without depending on the user input.

  The automatic scoring information 25 (25A to 25A,...) Is information indicating the presence or absence of automatic scoring for each answer, and displays "automatic scoring completed" for the automatically scored answer, and performs automatic scoring. If the answer is not given, "Automatic scoring is not possible" is displayed. As described above, when displaying the question-specific grading screen of FIG. 8, the control unit 15 compares the correct answer displayed in the correct-answer display column 22 and the answer displayed in each student-specific answer column 23 by OCR using text. Automatic scoring is performed by recognizing them as strings and comparing these character strings. If there is a student-specific answer column 23 on which a handwriting that cannot be recognized by the OCR is displayed, the control unit 15 sets “automatic scoring impossible” as the automatic scoring information 25 corresponding to the student-specific answer column 23. Displays the string of

  In the example of FIG. 8, the control unit 15 highlights the student-specific answer column 23 and the right / wrong determination button 24 corresponding to the answer for which automatic scoring could not be performed by a border effect. Thereby, the control unit 15 can appropriately notify the user of the presence of the answer that requires the correctness determination by the correctness determination button 24.

  When the completion button 26 is selected, the control unit 15 stores the question number specified in the question number selection field 21 in the storage unit 13 in association with the correct / wrong determination result of the answer for each student.

[Operation and effect of the present embodiment]
According to the scoring system of the present embodiment, the information processing apparatus 1 can appropriately set the answer extraction field by automatically detecting the answer column based on the blank image Im1 and the correct answer entry image Im2 read by the scanner 2. it can. In addition, when the information processing apparatus 1 acquires the answered image Im3 corresponding to each student to be graded, the information processing apparatus 1 extracts the handwriting of each student's answer for each question based on the set answer extraction field, and sets a graded screen for each question. Is displayed. Thus, the teacher using the information processing device 1 can efficiently score each question.

[Modification]
Next, a modification suitable for the above-described embodiment will be described. The following modifications may be arbitrarily combined and applied to the above-described embodiment.

(Modification 1)
The blank sheet 4, the answer entry sheet 5, and the answered sheet 6 may be a mark sheet type answer sheet.

  FIG. 9 shows an example of a mark sheet type correct answer entry sheet 5. In the example of FIG. 9, areas corresponding to numbers 1 to 6 are provided for each question, and areas corresponding to numbers corresponding to the correct answers are filled out. In the blank sheet 4, there is no filled area.

  In this example, when acquiring the blank image Im1 and the correct answer entry image Im2, the control unit 15 calculates the difference between the blank image Im1 and the correct answer entry image Im2 to obtain the correct answer entry image Im2 not entered in the blank image Im1. Recognize the filled area. Then, the control unit 15 specifies a minimum rectangular area surrounding the recognized filled area as an answer field, and sets an answer extraction field based on the specified answer field. For example, the control unit 15 sets, as an answer extraction field corresponding to the question “question 1 (1)”, an area of a broken line frame 27 larger than the rectangular frame detected as the answer column. As described above, even in the case of the answer sheet of the mark sheet system, the information processing apparatus 1 suitably extracts the answer column for each question based on the blank image Im1 and the correct answer entry image Im2, and sets the answer extraction field for each answer column. can do.

(Modification 2)
Instead of acquiring the blank image Im1, the correct answer entry image Im2, and the answered image Im3 from the scanner 2, the information processing device 1 may receive these information from a management server that manages test information.

  FIG. 10 is a configuration example of a scoring system according to a modification. In the example of FIG. 10, the information processing apparatus 1 is connected to the management server 7 via the communication network 9. The management server 7 refers to and updates the test information DB 8. The test information DB 8 records a blank image Im1, a correct answer entry image Im2, and an answered image Im3 relating to a test for which the user of the information processing apparatus 1 performs scoring. Then, when a test for scoring is designated by a user input, the information processing apparatus 1 receives a blank image Im1, a correct answer entry image Im2, and a answered image Im3 related to the test from the management server 7, and By performing the same process, the setting of the answer extraction field and the screen display regarding the scoring are performed.

(Modification 3)
Instead of scoring based on the answered image Im3 which is an image of the answer sheet on which the handwriting of the answer is written, the information processing apparatus 1 scores based on entry data generated by an entry device such as an electronic pen or a tablet with a touch panel. May go.

  In this case, the information processing device 1 receives the entry data including the handwriting position information generated by the entry device, thereby recognizing the position of the handwriting entered on the answer sheet of the student who operated each entry device. Then, the information processing apparatus 1 extracts the handwriting of the answer to each question based on the answer extraction field set based on the blank image Im1 and the correct answer entry image Im2. Thus, the information processing apparatus 1 can display a question-specific scoring screen or the like in the same manner as in the above-described embodiment.

(Modification 4)
Instead of writing the correct answer in each answer column, a check mark or the like may be written in each answer column on the correct answer entry sheet 5. In this case, the information processing apparatus 1 stores the correct answer information for each question number of the test performed in the storage unit 13 or the like as information necessary for scoring. When the question number is specified in the question number selection field 21 on the question-specific scoring screen of FIG. 8, the information processing apparatus 1 stores the correct answer information corresponding to the question number specified in the correct answer display field 22 in the storage unit 13 or the like. Extract from and display.

DESCRIPTION OF SYMBOLS 1 ... Information processing apparatus 2 ... Scanner 4 ... Blank sheet 5 ... Correct answer entry sheet 6 ... Answered sheet 11 ... Display unit 12 ... Input unit 13 ... Storage unit 14 ... Interface 15 ... Control unit

Claims (12)

Acquiring means for acquiring a first image representing an answer sheet of a test having an empty answer column and a second image representing an answer sheet of the test described in the answer column;
Detecting means for detecting the answer column in the first image and the second image based on a difference between the first image and the second image;
An information processing apparatus comprising:   2. The answer section according to claim 1, wherein the detection unit detects, as the answer column, a rectangular frame that surrounds the described location that is the difference among the rectangular frames present in the first image and the second image. 3. Information processing device.   The information processing apparatus according to claim 2, wherein the detection unit detects the answer column based on a size of the rectangular frame.   4. The information processing apparatus according to claim 1, further comprising a correct answer information acquiring unit configured to acquire correct answer information to be entered in the answer column from the second image. 5.   The information processing apparatus according to claim 4, wherein the correct answer information obtaining unit obtains the correct answer information by performing character recognition on an image in the answer column in the second image. Based on the answer column detected by the detection means, further comprising a setting means for setting an answer extraction area to extract the handwriting of the answer written in the answer column,
The obtaining means obtains a third image representing an answer sheet of the test in which an answer was made,
The information processing apparatus according to any one of claims 1 to 5, wherein the detection unit detects a handwriting in the answer extraction area in the third image as an answer entered in the answer column. apparatus.   7. The information processing apparatus according to claim 6, wherein the setting unit sets an area larger than the answer column detected by the detecting unit and including the answer column as the answer extraction region. When the acquisition unit acquires the third image representing the answer sheet answered by each of the plurality of answerers, the third image corresponding to the designated one answer column is included in the answer extraction area of each of the third images. The information processing apparatus according to claim 6, further comprising a display unit configured to display handwriting along with correct answer information to be entered in the answer column. A determination unit configured to determine whether each of the plurality of solvers described in the first answer column is correct or incorrect based on the handwriting in the answer extraction area and the correct answer information;
9. The information processing apparatus according to claim 8, wherein the display unit displays a result of the right / wrong determination on an answer indicated by the handwriting together with the handwriting in the answer extraction area. 10.   10. The information processing apparatus according to claim 9, further comprising an input accepting unit that accepts an input designating correctness of the handwriting in the answer extraction area in which the determination unit cannot perform the correctness determination.   The acquisition unit acquires the first image and the second image from optical devices that have read an answer sheet for a test in which the answer column is blank and an answer sheet for the test described in the answer column, respectively. The information processing apparatus according to claim 1, wherein: A program executed by a computer,
Acquiring means for acquiring a first image representing an answer sheet of a test having an empty answer column and a second image representing an answer sheet of the test described in the answer column;
A program that causes the computer to function as a detection unit that detects the answer column in the first image and the second image based on a difference between the first image and the second image.

Images