KR101041589B1 - ERROR DETECTING METHOD OF Optical Mark Recognition - Google Patents

Abstract

The present invention relates to an error detection method for accurately detecting an actual marking in an optical mark reading apparatus. In addition to the existing minimum value and the tolerance value, the present invention further sets a minimum value tolerance value that differs from the minimum value by an arbitrary value. No marking (blanking error) Set the value as low as the judgment error does not occur, and the minimum value tolerance should be set to a value that can include the measured value at the time of contamination, and judge the blanking error below the minimum value and check again. If it is a measured value between the minimum value and the minimum value tolerance value, it is necessary to check again whether the blanking error occurs, so as to drastically reduce the scoring work of the grader.

Optical Mark, Reading, Error, Marking, Scoring

Description

ERROR DETECTING METHOD OF Optical Mark Recognition}

The present invention relates to an error detection method for accurately detecting an actual unmarked in an OMM notation card reader.

The OML notation card reader recognizes a mark displayed on the notation card when a user marks an arbitrary mark among a plurality of marks formed on an OMR (Optical Mark Recognition) notation card by using a writing instrument such as a computer sign pen or a pencil. As a quick and accurate reading, it is mainly used for inputting test sheets or statistical analysis data.

Such an OMR notation card reader typically detects the amount of light transmitted or reflected by irradiating light onto an OMR notation card using an optical sensor, and reads the marked part using an OMR notation card using a conventional scanner. It is divided into reading methods through image processing, but the program itself for recognition is almost identical.

In the OLM notation card reader, the basic OMR notation card, which is normally marked before reading, is read once, and a minimum value for distinguishing the marked and the unmarked is obtained by inputting a reading value such as an item display number or a paper margin. When the user sets it through the input means, if a value less than the minimum value is detected in the reading process of the actual marking card, it is treated as an error so that the grader can check whether nothing is marked but the measured value is low. In this case, the unmarked case is called a blanking error. In some cases, if the program is below the minimum value, all of them may be regarded as blanking errors, or all of them may be determined as markings. It depends on whether you set it in an equation.

In addition, in order to find out what the user marked with the actual correct answer, that is, whether the pencil or pen was accidentally marked with the actual marking, or if the area or concentration was marked differently, the actual user recorded the correct answer. In order to detect a problem, if there are several values exceeding the minimum value, the user sets a difference value between the corresponding values, that is, a tolerance value in advance, and treats it as an error when there are several values within the corresponding tolerance value range. The case is called a duplicate marking error.

As described above, when the minimum value and the tolerance value are set, it reads the OMR marking card that is actually marked, and when the value is less than the minimum value, it is treated as an error so as to check whether there is a blanking error. If there are two or more of these, and there are two or more within the tolerance range, the duplicate marking error is treated as an error so that it can be judged.

If the above-mentioned errors occur in the automatic scoring process, the user separately outputs an image separately scanned by the program to the monitor so as to strictly check whether the blanking error or the duplicate marking error occurs. However, the grader confirms whether it is blurred or duplicated, and then finalizes the final scoring.In some cases, if the minimum value is less than the minimum value without checking as described above depending on the setting method of the program, all two errors occur within the tolerance range. If there is a problem, the program can be set to determine a duplicate marking error.

In the case of a test or questionnaire using such a notation card, there may be a lot of tests or questionnaires that are not marked on the notation card as a whole (for example, when the difficulty is too high to solve all of them in time), and in this case, the scoring process There are very many blanking errors in the system.

However, when a large number of blanking errors occur, the grader checks the marking card with blanking error after the automatic scoring is completed and checks whether or not it is actually marked, and checks whether there is a reading error. There was a problem that requires a lot of time and manpower.

In addition, even if the minimum value is appropriately set for the paper, even though the actual value is not marked by the foreign matter (sweat, etc.) on the paper, a value more than the minimum value is detected and processed by the marking. As the contaminated portion is read out, the minimum value is set too high, and even though the actual marking is performed, the unmarked portion may be read.

On the other hand, in the process of outputting the mark for checking the blanking error and duplicate errors in the above error check may be made for each item, it may be made of the entire notation card.

In order to prevent such misreading and excessive checking after scoring, a minimum tolerance value having a difference from the minimum value and an arbitrary value in addition to the existing minimum value and the tolerance value is further set so that the minimum value is no marking (ie blanking error) or marking. In the judgment, set the value as low as the error does not occur, and set the minimum tolerance value to a value that can include the measured value at the time of contamination, and determine the minimum value or less as blanking (blanking error) and check again. It is aimed to drastically reduce the grader's grading work by rechecking whether only the notation card corresponding to the measured value between the minimum value and the minimum value tolerance value is a blanking error.

A feature of the present invention for achieving the above object is, the CPU detects an error in the OML notation card reader to identify the measurement value for each mark displayed on the OMD notation card for each item to perform scoring of the notation card. In the method, the minimum value (A) of the measurement value for each mark is set to a value low enough that an error does not occur in the no-mark determination that finds the nothing card marked in the operation of the OML notation card reader. A setting step of setting a minimum value tolerance value B, which is a value added to the minimum value, to a value that may include a measured value at the time of contamination; After the above-mentioned setting step, in the reading process of the actual notation card, the measured value is less than the minimum value (A), the minimum value (A) is more than one, and the value is the minimum value (A) and the minimum value (A) A comparison step of determining whether it is between the sum of the values A + B and whether there is at least one minimum value A and the sum of the minimum value tolerance values and the minimum value A + B; In the comparison step, if all the measured values are less than or equal to the minimum value, the marker is judged no marking so as not to check again, and if the measured value is greater than or equal to the minimum value and the measured value is greater than or equal to the minimum value, the scorer is determined. It is determined as an error (hereinafter referred to as a minimum value error) to check again whether or not the marking is performed. In the error detection method of the OML notation card reader comprising a.

On the other hand, the setting step further comprises a tolerance value setting process for setting the difference between the measured value exceeding the minimum and the remaining minimum value among the measured value exceeding the minimum value among the measured values for determining whether the duplicate marking, In a comparison step, if two or more of the measured values are greater than or equal to the minimum value, the difference between the maximum value among the measured values and the measured value greater than or equal to the remaining minimum value is further calculated to determine whether the measured value is within the tolerance range. In the reading step, if the difference between the measured value that is greater than or equal to 2 and the maximum value and the remaining measured value that is greater than or equal to the minimum value is within the tolerance value, the grader again checks whether the marking error is a duplicate marking error (hereinafter referred to as a duplicate error). The process to judge further.

If the minimum and duplicate errors are found at the same time as described above, the controller notifies the grader that there is both a minimum value error and a duplicate error, and checks the confirmation process only during one of the minimum error or duplicate error check processes. The display of the corresponding card is controlled according to the program set to be checked in both processes.

According to the above configuration, since it is not necessary to check again when it is determined to be less than the minimum value, the scoring time is greatly shortened in the case of a markless card.

In addition, because the grader once again checks the marking card that was determined as marking despite the actual no marking due to contamination, the scoring error does not occur.

Therefore, according to the present invention, the scoring time is greatly reduced and the scoring time is shortened.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a diagram showing an OML notation card reader, which selects and sets a reading unit 20 for irradiating light to a mark portion of the notation card 10 to read the transmission amount or the reflection amount, and various operation modes of the reader. An input means 60 for inputting a value, a display unit 50 for allowing a grader to check various data and operation modes of the reader, a memory 30 for recording various data, and an output from the input means 60 described above. Read the notation card 10 in accordance with the signal to determine the signal output from the reading unit 20 to score and determine whether there is an error, while outputting a variety of information including the process to the marker through the display unit 50 It consists of a central processing unit 40 for recording arbitrary data in the memory 30.

The error detection method of the OMD notation card reader of the present invention configured as described above will be described in more detail below.

Setup step

When the OML notation card reader is driven, the marker or the manufacturer of the OMM notation card reader sets various setting values through the input means. Specifically, when the OMM notation card reader is driven, nothing is marked. Set the minimum value to a value low enough that no error occurs in the detection of a blanking error to find the value, and include a measured value at the time of contamination, and a minimum value difference that differs from the minimum value by an arbitrary value. In order to determine whether the marking is a duplicate marking, if there are two or more measured values exceeding the minimum value among the measured values, set the tolerance value which is the range of the difference between the highest measured value and the measured value exceeding the remaining minimum value.

Comparison step

When the setting step is completed and the grader inputs a scoring command through the input means, the central processing unit drives the reading unit to scan the marking cards. In this process, the central processing unit is output from the reading unit. Whether the measured values are all below the minimum value, at least one minimum value, and the value is between the minimum value and the minimum value tolerance value, whether there is at least one minimum value, and the minimum value and the minimum value tolerance value are equal to or greater than the minimum value among the measured values. If there are two or more values, the difference between the maximum measured value and the remaining minimum measured value is calculated to determine whether the difference is within the tolerance range or more.

Reading step

In the above comparison step, if all the values are less than the minimum value, it is judged as nothing marking (blanking error) so that the grader does not check again.The value is more than the minimum value and the measured value is between the minimum value and the minimum value tolerance value. If this is detected, the grader judges the minimum value error to check the blanking error again.If the minimum value is more than one and the minimum value and the minimum value tolerance value are more than the combined value, the marking part is judged as normal marking and scored. If the difference between the measured value which is more than the minimum value is more than 2 and the measured value which is the largest value and the remaining minimum value is within the tolerance value, it is judged as a duplicate error so that the grader can check the measured value more than the minimum value again. The measured value which is more than the minimum of 2 and the maximum of the measured value If the difference between the measured value and the remaining minimum value is out of the tolerance value range, the maximum value is regarded as normal marking and scoring is performed.

For example, the minimum value is 3,000, the minimum value tolerance is set to 10,000, and the tolerance value is set to 30,000. For example, in the 5-line polymorphism test, the measured values of each answer are as shown in Table 1.

Answer number Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 One 2000 2000 2000 2000 2000 2000 2 1000 1000 1000 1000 1000 1000 3 1500 1000 1500 2500 7000 7000 4 2500 2000 25000 1000 25000 15000 5 40000 1500 40000 7000 40000 30000

In Example 1, all of the measured values 1 to 4 are less than the minimum value, and since only one measured value that is greater than or equal to the minimum value, that is, the measured value 5 is greater than or equal to 13,000, which is the sum of the minimum value and the minimum value tolerance, it is determined that the number 5 is marked. Score.

In Example 2, since all measured values 1 to 5 are less than the minimum value, it is determined as no marking.

In Example 3, the measured values of 1 to 3 are all below the minimum value, and since there are two measured values above the minimum value, no minimum error occurs, and the difference between the two measured values above the minimum value, that is, the measured values 4 and 5 is 15,000. Since the value is within 30,000, it is considered as a duplicate error.

In Example 4, all of the measured values 1 to 4 are less than the minimum value, and one measurement value that is greater than or equal to the minimum value, that is, the 5th measurement value is within 13,000, which is the sum of the minimum value and the minimum value tolerance value, is determined as the minimum value error.

In Example 5, the measured values 1 to 2 are all less than the minimum value, and since the measured value 3 is less than or equal to 13,000, which is the sum of the minimum value and the minimum value tolerance value, the measured value is determined to be the minimum value error and measured more than the minimum value. 4 and 5 are regarded as duplicate errors because there is 4 measured value which is within 30,000 difference from the 5 measured value which is the maximum value. At this time, the measured value 3 is not considered as a duplicate error because the difference from the measured value 5 is 33,000 and exceeds the tolerance value 30,000.

In Example 6, the measured values of 1 to 2 are all less than the minimum value, and since the measured value 3 is less than or equal to 13,000, which is the sum of the minimum value and the minimum value tolerance, the measured value is determined to be the minimum value error, and the measured value is more than the minimum value. 3 and 4 and 5 are regarded as duplicate errors because there are 3 and 4 measured values with a maximum difference of 5 and 30,000.

Warning step

When the minimum value error and duplicate error are found at the same time as described above, the controller informs the grader that there is both a minimum value error and a duplicate error. In this process, the checker checks the minimum value error or duplicate error. The display of the corresponding card is controlled according to a program set to be checked only in one of the procedures or in both processes.

For example, when an error is detected, a separate icon is activated or a pop-up window is displayed on the monitor. Therefore, if an icon or a pop-up window is selected only once, both errors can be confirmed. That is, in the sixth embodiment, 3, 4, 5, or 4, 5 overlap, or 5 can be determined as a correct answer in one selection, that is, click can determine whether the final error.

1 is a block diagram showing an OMR notation card reader

Claims (3)

In the method of detecting an error in the OMM notation card reader that identifies the mark value of each mark displayed on the OMM notation card for each item and performs scoring of the notation card, The minimum value (A) of the measurement value for each mark is set to a value low enough that an error does not occur in the no-mark judgment for finding an unmarked marking card in the operation of the OMR notation card reader. Setting a minimum value tolerance value (B), which is a value added to the minimum value to a value that may include a; After the above-mentioned setting step, in the reading process of the actual notation card, the measured value is less than the minimum value (A), the minimum value (A) is more than one, and the value is the minimum value (A) and the minimum value (A) A comparison step of determining whether it is between the sum of the values A + B and whether there is at least one minimum value A and the sum of the minimum value tolerance values and the minimum value A + B; In the comparison step, if all the measured values are less than or equal to the minimum value, the marker is judged no marking so as not to check again, and if the measured value is greater than or equal to the minimum value and the measured value is greater than or equal to the minimum value, the scorer is determined. It is determined as an error (hereinafter referred to as a minimum value error) to check again whether or not the marking is performed. A reading step of judging; Error detection method of the OML notation card reader, characterized in that comprising a. The method of claim 1, wherein in the setting step, a tolerance value setting process of setting a difference between a measured value exceeding a minimum value among the measured values exceeding a minimum value among the measured values for determining whether a duplicate marking is exceeded and a measured value exceeding the remaining minimum value is further performed. In the comparing step, if there are two or more values that are greater than or equal to the minimum value among the measured values, a process of determining whether the tolerance value is within the tolerance range is calculated by calculating a difference between the maximum value among the corresponding measured values and the measured value greater than or equal to the remaining minimum value. Further, in the reading step, if the difference between the measured value which is greater than or equal to 2 and greater than the minimum value and the remaining measured value that is greater than or equal to the minimum value is within the tolerance value, an error (hereinafter referred to as a duplicate error) can be checked again by the grader. The error detection method of the OML notation card reader, characterized in that further performing the determination process. The method of claim 2, wherein when the minimum value error and the duplicate error are found at the same time, the controller notifies the grader that there is both the minimum value error and the duplicate error, and confirms the checking process only in one of the steps of checking the minimum value error or the duplicate error. Or detecting the display of the corresponding marking card according to a program set to be checked in both processes.

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