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Method for detecting secondary pollution generated by scanning of answer sheet and device thereof

A technology of secondary pollution and answer sheet, applied in the field of answer sheet identification, can solve the problem of inability to detect secondary pollution by scanning answer sheet

Inactive Publication Date: 2017-06-16
SHENZHEN SEA SKY LAND TECH
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Problems solved by technology

[0004] The present invention provides a method and device for detecting secondary pollution caused by answer card scanning, aiming to solve the problem that it is impossible to detect whether answer card scanning produces secondary pollution

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  • Method for detecting secondary pollution generated by scanning of answer sheet and device thereof
  • Method for detecting secondary pollution generated by scanning of answer sheet and device thereof
  • Method for detecting secondary pollution generated by scanning of answer sheet and device thereof

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Embodiment Construction

[0036] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0037] As the first embodiment of the present invention, such as figure 1 As shown, the invention provides a method for detecting secondary pollution caused by scanning answer sheets, said method comprising the steps of:

[0038] Step S101: Divide the acquired grayscale image of the answer sheet into a plurality of scanning areas, and divide the scanning areas in units of a preset number of pixels to obtain several sub-images.

[0039] Step S102: Scanning the scanning areas in sequence, and counting the number of sub-images whose pixel grayscale values ​​in each scanning area reach a preset grays...

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Abstract

The invention provides a method for detecting secondary pollution generated by scanning of an answer sheet and a device thereof, and aims at solving the problem that whether scanning of the answer sheet generates secondary pollution cannot be detected. A grayscale answer sheet image is divided into multiple scanning areas and the scanning areas are divided with the preset number of pixels acting as the unit so as to obtain multiple sub-images; and the scanning areas are scanned in turn, statistics of the number of the sub-images of which the pixel grayscale value reaches the preset grayscale value in each scanning area is performed and then calculation is performed based on the number so as to determine secondary pollution of the answer sheet. According to the method or the device, whether the answer sheet generates secondary pollution can be effectively detected in real time.

Description

technical field [0001] The invention relates to the technical field of answer sheet identification, in particular to a method and device for detecting secondary pollution caused by scanning answer sheets. Background technique [0002] The first thing to do in the online marking scheme based on paper examination papers is to digitize the paper answer sheets. Using a high-speed scanner for large-scale non-contact gray-scale scanning imaging is a common technology for obtaining electronic images of paper answer sheets. When the answer sheet passes through the scanner, the linear photocoupler (CCD) separates the scanned image into lines, and each The width of the line is about 10 microns. The light source irradiates the light on the question card to generate reflected light or projected light, which is then reflected into the center by the mirror group. The CCD converts the current of different sizes according to the intensity of the reflected light. After A / D conversion proces...

Claims

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Application Information

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IPC IPC(8): G06K9/03G06K9/00
CPCG06V30/414G06V10/98
Inventor 刘雄敏冯亚军涂生华
Owner SHENZHEN SEA SKY LAND TECH
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