A Joint-Based Method for Cutting Answer Areas of the Same Batch of Test Papers
A technology of area cutting and test paper, applied in the field of image processing, can solve the problems of numerous parameters, uneven brightness, and contrast deviation positioning rectangular frame, etc., to achieve the effect of simple and fast algorithm and solving inaccurate recognition.
Active Publication Date: 2022-03-08
东莞茅飞信息科技有限公司
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[0003] However, this image processing algorithm has many parameters, and different parameters are aimed at different image characteristics.
It is difficult to find a set of parameters that can be adapted to all test paper pictures
Therefore, the traditional image recognition algorithm relies heavily on the scanning conditions of the test paper itself. For example, the test paper may be tilted, the brightness is uneven, and the contrast deviation, etc. will make it difficult to locate all the rectangular boxes 100% in all cases.
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[0062] In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the embodiments and accompanying drawings, and the contents mentioned in the implementation modes are not intended to limit the present invention.
[0063] A joint-based method for cutting answer areas of the same batch of test papers, including:
[0064] First adjust the image of the test paper to be cut to a certain specification (preferred width is 1080, height is 1522), the image is as follows figure 1 shown, then the figure 1 The image is transformed into such as figure 2 The grayscale image shown, and the grayscale image ( figure 2 ) for image extension to obtain image 3 Optimal DFT size diagram shown;
[0065] For the optimal DFT (Discrete Fourier Transform) size map ( image 3 ) to perform Fourier transform to obtain a frequency domain image for binarization, such as Figure 4 shown; then the image obtained afte...
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The invention relates to the technical field of image processing, and specifically discloses a joint-based method for cutting answer areas of the same batch of test papers, including correction of single test papers, detection of rectangular frames, and generation of template test papers of the same batch of test papers through clustering. The regression statistical method establishes the translation relationship between the template test paper and the scanned test paper, and completes and cuts the missing answer area position information of the scanned test paper according to the translation relationship. The present invention generates template test papers of the same batch of test papers by means of clustering, uses the linear regression statistical method to establish the translation relationship between the template test papers and the scanned test papers, completes and cuts the missing answer area position information of the scanned test papers according to the translation relationship, so as to effectively solve the problem. Inaccurate recognition, blurred printing and other reasons lead to the recognition of missing answer areas, and the algorithm is simple and fast, and can cut out all the answer areas of the test paper.
Description
technical field [0001] The invention relates to the technical field of image processing, and specifically discloses a joint-based method for cutting answer areas of the same batch of test papers. Background technique [0002] With the continuous development of artificial intelligence image processing technology, automatic batching of student test papers is becoming more and more feasible. In the automatic marking of test papers, one of the extremely important steps is to locate the answer area. Because the answer area is relatively large, students have a greater degree of freedom in the process of writing. A common practice is to design an explicit rectangular box as the answer area for each question. When the test paper is printed, the rectangular frame and the test questions will be printed at the same time. After the students answer the questions, the test paper is scanned by the scanner to form a digital picture, and then the image processing method is directly used t...
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IPC IPC(8): G06V10/26G06V10/24G06V10/28
CPCG06V10/245G06V10/28G06V10/267
Inventor 涂旭平刘昌杰
Owner 东莞茅飞信息科技有限公司