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Image positioning frame detection method and device

A detection method and positioning frame technology, applied in character and pattern recognition, instruments, computer parts, etc., can solve problems such as distortion, inability to popularize, and difficult to accurately locate the answering area.

Inactive Publication Date: 2018-10-12
BEIJING BOXFISH EDUCATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Common remote marking systems can usually only process scanned images
However, it is difficult to accurately locate the exact answer area in the photos taken by users with mobile phones due to problems such as noisy background, perspective and distortion.
Therefore, the marking system based on image processing is usually only used in large-scale examinations (using a scanner to uniformly scan the test papers), and cannot be popularized in daily corrections (using mobile phones to take photos)

Method used

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  • Image positioning frame detection method and device
  • Image positioning frame detection method and device
  • Image positioning frame detection method and device

Examples

Experimental program
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Embodiment approach

[0029] figure 2 A schematic flow chart of detecting the contour of a positioning frame according to an embodiment of the present invention is shown. Such as figure 2 As shown, according to an embodiment of the present invention, the detection of the outline of the positioning frame includes the following steps.

[0030] Firstly, in step 201, the auxiliary foreground color block area is drawn (according to the context, the color block area is also called color block). image 3 A schematic diagram of a binary map plotted with auxiliary detection patches is shown. Such as image 3 As shown, according to an embodiment of the present invention, in the binarized image, the background appears as black (the color of the background), and the text or part of the interference information appears as white (that is, the color of the foreground). Draws a secondary background patch of a specific size, and draws a secondary foreground patch of a slightly smaller size over this area (see...

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Abstract

The invention relates to an image positioning frame detection method and device. The positioning frame detection method comprises an image acquisition step of acquiring an image of a page with a positioning frame; a preprocessing step of carrying out binarization on the image; an auxiliary detection color block drawing step of drawing an auxiliary background color block and an auxiliary foregroundcolor block which are overlapped in a center area of the binary image, wherein the auxiliary background color block surrounds the auxiliary foreground color block; a binary image connected domain detection step of detecting connected domains of the binary image and establishing a hierarchical relation between the connected domains; an auxiliary foreground color block outline connected domain determination step of determining the connected domain of an auxiliary foreground color block outline according to the coordinates of the drawn auxiliary foreground color block; a positioning frame connected domain determination step of outwards finding the connected domain of the positioning frame by utilizing the hierarchical relation between the connected domains through the connected domain of theauxiliary foreground color block outline; a positioning frame vertex detection step of carrying out vertex detection of the positioning frame according to the connected domain of the positioning frame.

Description

technical field [0001] The invention relates to image detection and deformity correction, and can be used for positioning and correction of answering areas in a remote marking system. Background technique [0002] The development of computer networks has greatly changed people's lives, and remote marking and correction have gradually increased. Common remote marking systems can usually only process scanned images. However, it is difficult to accurately locate the exact answering area in the photos taken by users with mobile phones due to problems such as noisy background, perspective and distortion. Therefore, the marking system based on image processing is usually only used in large-scale examinations (using a scanner to uniformly scan test papers), and cannot be popularized in daily corrections (using mobile phones to take pictures). Contents of the invention [0003] The present invention is made in view of the above situation, and is used to detect the positioning fr...

Claims

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Application Information

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IPC IPC(8): G06K9/32G06K9/38
CPCG06V10/245G06V10/28
Inventor 黎小说
Owner BEIJING BOXFISH EDUCATION TECH CO LTD