Image verification code generation method based on character 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, not understanding the basic principles of image processing and recognition, and difficulty in human eye recognition, so as to improve user experience. , Improve the recognition difficulty and ensure the effect of normal recognition
Inactive Publication Date: 2017-10-17
ZHEJIANG FORESTRY UNIVERSITY
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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
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[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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The invention relates to a method for generating a picture verification code based on character drawing, comprising: defining a character library; generating a background color map of the verification code, and establishing coordinates on the background color map; randomly selecting 4-6 characters from the character library as Captcha characters; generate captcha character size and position one by one and draw captcha characters and noise; add global noise and other steps. The verification code generated by the invention can increase the difficulty of machine recognition, and at the same time ensure normal recognition by human eyes, improve the safety performance of the verification code and provide good user experience.
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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IPC IPC(8): G06T11/60
Inventor 刘丽娟董毅光
Owner ZHEJIANG FORESTRY UNIVERSITY