Answer sheet filling information automatic recognition method based on comprehensive features of images

A technology for automatic information recognition and image synthesis, applied in character and pattern recognition, instruments, computer parts, etc., it can solve the problems of poor compatibility and low recognition efficiency, and achieve the effect of fast recognition speed and high robustness.

Active Publication Date: 2014-12-24
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

The purpose of the present invention is to overcome the problems of poor compatibility and low recognition efficiency of existing recognition algorithms, and provide an answer sheet that is compatible with different papers, and is also compatible with red filter cards, with half-frame and full-frame options in the option area Or letters and other types of answer sheets, and has a fast recognition speed and a high robustness method, the specific technical solution is as follows

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  • Answer sheet filling information automatic recognition method based on comprehensive features of images
  • Answer sheet filling information automatic recognition method based on comprehensive features of images
  • Answer sheet filling information automatic recognition method based on comprehensive features of images

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Embodiment Construction

[0035] The embodiments of the present invention will be further described below in conjunction with the accompanying drawings, but the implementation of the present invention is not limited thereto.

[0036] Such as figure 1 , the main flow of the method for automatic identification of filling information in answer sheets based on image comprehensive features includes the following steps:

[0037] (a) sequentially acquire a multiple-choice area grayscale image from the answer sheet image;

[0038] (b) performing a morphological closing operation on the grayscale image obtained in step (a);

[0039] (c) performing an adaptive threshold binarization operation on the grayscale image obtained after step (b) processing, and obtaining the binarization threshold thresh;

[0040] (d) performing contour detection on the binarized image obtained in step (c), and judging whether there is an abnormal contour;

[0041] (e) inverting the grayscale image obtained in step (a) to obtain ima...

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Abstract

The invention provides an answer sheet filling information automatic recognition method based on comprehensive features of images. First, area image data of a choice question are acquired, morphological processing is performed on the area image data of the choice question, binarization is performed on a self-adaptive threshold, and contour detection and abnormal contour judgment are performed on a binarized image, relevant evaluation indexes are calculated through the original image, the morphologically-processed image and the binarized image, the filling result is judged through the evaluation indexes and the global consistency threshold obtained through calculation, finally, the recognition result is returned, and the global consistency threshold is updated. The method is compatible with answer sheets made of different kinds of paper, red filter sheets and answer sheets with half frames or full frames or letters in option areas, and has a high recognition speed and high robustness.

Description

technical field [0001] The invention generally relates to the fields of computer pattern recognition and image processing, and in particular to an automatic recognition method for answer sheet filling information. Background technique [0002] With the development of information technology, the amount of data processed by computers is increasing. In many fields, it is urgent to solve the problems of massive data collection, identification and input. At present, OMR (Optical Mark Reading Machine) has been used to solve this problem in large-scale examinations such as the college entrance examination, the adult college entrance examination, and the National College English Rank Examination. Although OMR technology has solved some problems of answer card data entry, but because its own technology is based on photoelectric recognition technology, there are many problems that are currently difficult to solve: (1) Equipment-specific: photoelectric recognition machines can only be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06K9/46
Inventor 黄翰刘志方郝志峰
Owner SOUTH CHINA UNIV OF TECH
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