Method for identifying information fulfilling card based on template matching

Abstract

The invention relates to an information filling card identifying method based on template matching. A blank information card is used to build the image information of a template and obtain a template information card; the effective filling threshold of the filling point option of the template information card is set; the background mode definition of the filling point option of the template information card to be identified is extracted and different background modes of the template option are respectively transferred to carry out filling point identification; if the filling point result is larger than or equal to the set threshold, then the option is considered to be validly filled; or the filling is invalid. The information filling card identifying method based on template matching can be suitable for identifying the gray scale modes of different types; the identifying results are graded and the flexibility is high; the integral identifying rate can be improved; batch identificationis available, the human-computer combination can be realized, better meeting the demands of actual application. The information filling card identifying method defines all the option areas to obtain accurate template information. The difference between the current image and the template image are used for identification, thus solving the problem of grain background interference.

Description

technical field [0001] The invention belongs to the technical field of information processing, and in particular relates to a computer automatic identification technology for option filling conditions in an information filling card. Background technique [0002] At present, Optical Marker Recognition (OMR) is widely used in standardized marking, questionnaire survey, ballot counting, population census and other fields. OMR technology generally uses photoelectric pair tube reading technology, which uses two photoelectric devices, namely semiconductor light-emitting tubes and photosensitive tubes. When identifying, the light emitted by the light-emitting tube is irradiated on the option painted area, and the reflected light from the option painted area is received by the photosensitive tube. Because the condition of the option filling directly determines the strength of the reflected light, it can be determined whether the option is filled or not according to this characteris...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problems in the prior art that the recognition accuracy is low due to the texture background interference, and the optional painting point recognition cannot be applied to non-standard filling and painting, the purpose of the present invention is to propose a new method for image grayscale, position offset, etc. A method with strong self-adaptability and high recognition accuracy. Another purpose of the present invention is to provide a method for identifying information filling cards based on template matching for the identification of the option filling areas on the information filling cards.

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