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Binaryzation and segmentation method for Chinese character verification code

A technology of Chinese characters and verification codes, applied in character and pattern recognition, character recognition, instruments, etc., to achieve the effect of strong tolerance and accurate character segmentation results

Active Publication Date: 2017-08-11
SHANGHAI UNIV
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  • Application Information

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Problems solved by technology

This method is not suitable for splitting Chinese character verification codes. In Chinese characters, a character may contain multiple connected domains.

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  • Binaryzation and segmentation method for Chinese character verification code
  • Binaryzation and segmentation method for Chinese character verification code
  • Binaryzation and segmentation method for Chinese character verification code

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Embodiment Construction

[0024] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0025] Such as figure 1 As shown, a binarization and segmentation method for Chinese character verification codes, the specific operation steps are as follows:

[0026] (1) Grayscale the obtained original verification code image, and linearly map the pixel values ​​of the image to the [0,1] interval.

[0027] (2) Denoise and binarize the grayscale image. If there are many or thick interference lines in the image, or there is a gradient background, perform morphological reconstruction without Gaussian smoothing and morphological reconstruction with Gaussian smoothing on the image, and then perform a pixel-by-pixel OR operation on the two reconstruction results , to get the denoised image. Among them, the kernel size of Gaussian smoothing is 1.0. If the contrast between the characters in the image and the background color is not strong, th...

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Abstract

The invention relates to a binaryzation and segmentation method for a Chinese character verification code, and aims at carrying out the foreground and background segmentation of a Chinese character image. The method mainly employs a Gaussian smooth filtering method, a morphological reconstruction method and a Mean Shift clustering method, and comprises the steps: firstly carrying out the graying and noise reduction of an image; carrying out the graying of an obtained verification code image, employs a different noise reduction method according to the noise condition of the image, and obtaining a character image suitable for the recognition of characters; carrying out the binaryzation of the image, segmenting the characters of the foreground from the background, and locating pixels representing the characters; carrying out the clustering of the characters, employing the Mean Shift clustering method for the pixels in an original image, and obtaining the clusters of the characters; taking the character pixels at the same cluster point as the same character after clustering adjustment; obtaining the pixel expression of each character in the verification code, i.e., completing the segmentation of characters.

Description

technical field [0001] The invention relates to a method for filtering background noise in two-dimensional character verification codes, more specifically, a binarization and segmentation method for Chinese character verification codes. Background technique [0002] Character verification codes are widely used in Internet services as a tool to determine whether network requests come from legitimate users, so as to prevent a large number of automatic requests from machines and ensure the stable operation of website servers. Character verification codes are currently the most commonly used type of verification codes. This type of verification code usually requires the user to complete a character recognition task, and the user needs to correctly identify each character in the character image generated by computer image technology to pass the verification. In order to increase the difficulty of machine recognition of verification codes, the images of such verification codes ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/34G06K9/54G06K9/62
CPCG06V30/153G06V10/20G06V30/10G06F18/23
Inventor 武星裴孟齐
Owner SHANGHAI UNIV
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