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Automatic detection method for test paper form

An automatic detection and test paper technology, applied in the direction of instruments, character and pattern recognition, computer components, etc., can solve the problem that the form line cannot form a peak value, it is difficult to detect the form, broken line, form line and character sticking can not be satisfied, etc. , to achieve good practical value, high accuracy, high reliability and accuracy

Inactive Publication Date: 2008-12-03
SHANGHAI UNIV
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Problems solved by technology

The former judges the table line by calculating the projected peaks in the horizontal and vertical directions, but if the table line itself is short or thin and has a slight slope, the peak may not be formed at the table line, so it is difficult to accurately detect the table
The latter obtains the table outline by tracking the edge points of the image, but it cannot obtain satisfactory results for broken lines, table lines and characters sticking together

Method used

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  • Automatic detection method for test paper form
  • Automatic detection method for test paper form
  • Automatic detection method for test paper form

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Embodiment 1

[0041] Embodiment 1: In order to better understand the technical solution of the present invention, the embodiment will be further described in detail in conjunction with the accompanying drawings. The specific operation steps of the automatic detection method of the paper surface form are as follows:

[0042] (1) Use the Hough transform to find the tilt angle

[0043] ① Input sample

[0044] The real-time image of the test paper is obtained through the camera, and the image of the student number part and the score part is as follows: figure 1 shown.

[0045] ②Pretreatment

[0046] The computer performs grayscale, binarization, smoothing and denoising, thinning and other processing on the obtained real-time test paper image, such as figure 2 shown.

[0047] ③ Calculate the tilt angle

[0048] Carry out Hough transform on the test paper image, and judge whether the test paper image is tilted, and if it is tilted, calculate the tilt angle θ of the test paper image.

[00...

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Abstract

The invention relates to a pattern recognition technique in the computer processing field, in particular to an automatic detection method of a paper version table of a test paper. The method obtains the real time paper version image of the test paper by a camera; after preprocessing and fining, the elevation angle of the paper version image is find out by utilizing Hough conversion; then, horizontal and vertical line segments in the test paper are extracted; finally, the horizontal and vertical line segments are combined into the table by combining the elevation angle. By adopting the method of the invention, the efficiency and the accuracy of the automatic entry and recognition of table files and bills can be greatly improved.

Description

Technical field: [0001] The invention relates to an automatic form detection method, in particular to a method for automatic detection of forms on the test paper surface. Background technique: [0002] In the teaching process, test papers are widely used in various schools as an important teaching evaluation method, but teachers need to spend a lot of time processing and counting the information on the test papers. How to automatically enter and process the information in such a large number of test papers is a difficult problem at present. Therefore, automatic entry and processing of test paper information has great research value and application prospects. Tables are the main way of expressing the information in the test paper. The input of a large amount of table information into the computer has become a cumbersome work for people, which directly affects the efficiency of entering and processing the information on the test paper. Therefore, the research on the automati...

Claims

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Application Information

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IPC IPC(8): G06K9/20G06K9/36
Inventor 冯运亮薛雷罗珍茜孙峰杰
Owner SHANGHAI UNIV
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