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Generation method of picture verification code based on characters drawing

A picture verification code and verification code technology, which is applied in the field of picture verification code generation based on character drawing, can solve the problems of increasing the difficulty of machine recognition, difficulty in human eye recognition, and lack of understanding of the basic principles of image processing and recognition, so as to improve user experience. , The effect of ensuring normal recognition and improving the difficulty of recognition

Inactive Publication Date: 2015-05-20
ZHEJIANG FORESTRY UNIVERSITY
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AI Technical Summary

Problems solved by technology

The key problem is that the verification code characters of the existing methods, whether they are Chinese characters, English, numbers, or three-dimensional characters, all use a certain existing known font, and the outline features of the characters in the image are significantly different from the interference noise.
In addition, the interference methods adopted by many existing image verification codes have not played a substantial role. Without understanding the basic principles of image processing and recognition, blindly adding noise and deformation may not necessarily increase the difficulty of machine recognition, but may cause Difficulty with human eyes

Method used

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  • Generation method of picture verification code based on characters drawing
  • Generation method of picture verification code based on characters drawing
  • Generation method of picture verification code based on characters drawing

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Embodiment Construction

[0029] In order to enable those skilled in the art to better understand the inventive solutions, the technical solutions in the embodiments of the invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the invention.

[0030] Such as Figure 1-2 As shown, the picture verification code generation method based on character drawing of the present invention comprises the following steps:

[0031] (1) Define the character library, define the strokes and stroke drawing coordinates of the characters; among them, the character library includes a limited number of characters that can be entered from the computer, such as 26 uppercase English letters and 10 Arabic numerals; each character is a double line Hollow characters; character strokes decompose each character into straight or curved segments that are convenient for coordinate representation;

[0032] In this step, in order to be able to draw verification code characters of...

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Abstract

The invention relates to a generation method of a picture verification code based on characters drawing. The generation method comprises the following steps: defining a character library; generating a background color picture of the verification code, and establishing coordinates on the background color picture; selecting four to six characters from the character library at random, so as to be used as verification code characters; generating sizes and positions of the verification code characters one by one, and drawing the verification code characters and noise; adding global noise. By using the verification code generated by the generation method, the machine recognition difficulty can be increased, additionally, normal recognition of eyes is guaranteed, and the safety performance of the verification code and good user experience are improved.

Description

technical field [0001] The invention relates to a method for generating a picture verification code based on character drawing. Background technique [0002] The methods widely used in existing image verification code generation methods include: using random fonts, character deformation, character rotation, character adhesion, adding noise, and the like. The key problem is that the verification code characters of the existing methods, whether they are Chinese characters, English, numbers, or three-dimensional characters, all use a certain existing known font, and the outline features of the characters in the image are significantly different from the interference noise. . In addition, the interference methods adopted by many existing image verification codes have not played a substantial role. Without understanding the basic principles of image processing and recognition, blindly adding noise and deformation may not necessarily increase the difficulty of machine recognition...

Claims

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Application Information

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IPC IPC(8): G06T11/60
Inventor 刘丽娟董毅光
Owner ZHEJIANG FORESTRY UNIVERSITY
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