Rectangular flag bit detection method based on pixel extraction

A technology of pixel extraction and detection method, applied in the direction of instrument, calculation, character and pattern recognition, etc., can solve the problems of reducing program stability, poor compatibility, high demand for printing and scanning, and improve stability and scalability. Effect

Pending Publication Date: 2022-05-31
南京红松信息技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method has two disadvantages. The first disadvantage is that the mark of the answer sheet needs to be a special color, which requires high printing and scanning, and there is a certain threshold for users, and the compatibility is poor.
The second disadvantage is that the area around the s

Method used

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  • Rectangular flag bit detection method based on pixel extraction
  • Rectangular flag bit detection method based on pixel extraction
  • Rectangular flag bit detection method based on pixel extraction

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

Embodiment: as shown in Figure 1, this detection method based on the rectangle mark position of pixel extraction, specifically comprises the following steps

S1: to the test paper image of collection (can be scanned by scanner, or carry out image restoration and feature by taking pictures

The concrete steps of described step S1 are:

S11: global binarization process to the collected image, then detect the outline of the image, and fill in the hole, the most

feature map; the specific process of the average pooling processing in the step S12 is: the restored image to be processed according to the fixed size

S2: the feature map of the average pooling that obtains in step S1 utilizes image feature to carry out the fuzzy search of global sign position

S21: carry out the detection of the image outline again according to the feature map of the average pooling obtained in step S12, for

Described condition one in described step S21 is: outline needs to satisfy that black pixel p...

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Abstract

The invention relates to a rectangular flag bit detection method based on pixel extraction, and the method comprises the steps: S1, carrying out the image restoration and feature extraction of a collected image, and obtaining an average pooling feature map; s2, performing global flag bit fuzzy search on the averaged pooling feature map obtained in the step S1 by using image features to obtain all flag bits possibly existing in the image; s3, carrying out precise positioning reduction on each zone bit obtained in the image; and S4, returning flag bit information conforming to the standard. The detection method for the rectangular flag bit based on pixel extraction not only meets the requirement of intelligent paper marking, but also can be suitable for different scenes, and the stability and expandability of a program are improved.

Description

technical field [0001] The invention belongs to the technical field of computer image processing, and in particular relates to a detection method of a rectangular flag position based on pixel extraction. Background technique [0002] With the development of computer technology and optical scanning, intelligent automatic entry of answer sheets is becoming more and more popular. Among them, the intelligent entry of answer sheets is usually accompanied by a series of questions, such as scanning upside down, tilting and so on. Adding flags on the answer sheet is an effective way to solve the above problems. Through the detection of key marks, the direction and angle of the answer sheet can be judged, and the answer sheet can be corrected and restored. [0003] The detection of the general flag position is to detect the rectangular frame of special color through computer image technology, and obtain information such as the position and size of the rectangular frame. The tradit...

Claims

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Application Information

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IPC IPC(8): G06V30/40G06V30/146G06V30/16G06V30/18
Inventor 江人杰
Owner 南京红松信息技术有限公司
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