Rectangular flag bit detection method based on pixel extraction

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...

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 sign of the answer sheet should be kept as clean as possible, and there should be no stains or alterations. However, these noise effects may be caused by students in the process of answering the sheet, especially for students in the lower grades. The stability of the program is reduced ( figure 2 shown)

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