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Method for detecting chemical formula in image based on characteristics of chemical formula

An image, chemical technology, applied in character and pattern recognition, instruments, computer parts and other directions, can solve the problems of complex methods, high image requirements, difficult implementation, etc., to achieve low method complexity, simple method implementation, and preprocessing. simple method effect

Active Publication Date: 2016-08-17
COMMUNICATION UNIVERSITY OF CHINA
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  • Description
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  • Application Information

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Problems solved by technology

Existing chemical formula detection methods are mainly pattern recognition and other technologies. Although this type of technology can detect chemical formula images, the method is complicated, difficult to implement, and has relatively high requirements for images.

Method used

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  • Method for detecting chemical formula in image based on characteristics of chemical formula
  • Method for detecting chemical formula in image based on characteristics of chemical formula
  • Method for detecting chemical formula in image based on characteristics of chemical formula

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Embodiment Construction

[0052] The present invention will be further described below in conjunction with accompanying drawing:

[0053] The technical scheme of this embodiment is as figure 1 Shown:

[0054] The image database used in this implementation example is a document image database scanned by a scanner, and the text image to be detected can be an image in bmp format (or other formats), which is stored on a local disk. The table image detection method in this implementation example is implemented by VS2012 programming.

[0055] 1. First, the user inputs the detected text image, first performs grayscale transformation and global binarization on the input detected text image, and sets the threshold of global binarization to 220, and then performs vertical projection segmentation and horizontal projection segmentation on the image , until the image can no longer be segmented in the vertical and horizontal directions. Perform single / double key judgment on the separated characters. If the image...

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Abstract

The invention provides a method for detecting a chemical formula in an image based on characteristics of a chemical formula. According to the method of the invention, gray scale transformation, binarization and dividing are performed on a random text image; and chemical formula detection is performed through two aspects of divided characters and a whole image. The method for detecting the chemical formula comprises the steps of determining single / double bonds, matching a template, determining an image pixel density and determining phenyl ring, wherein the divided characters are detected in determining single / double bonds and matching the template, and the whole image is detected in determining the image pixel density and determining the phenyl ring. Detection by four modules is performed on the image successively. If detection by a certain module is satisfied, a fact that the image is a Chemical formula image is determined. According to the method of the invention, detection is mainly performed according to the common character characteristic of the chemical formula and writing structure characteristics; and detection is performed through the projection characteristic of the character, the image density and the structure characteristic of the character. The method has advantages of easy realization, low requirement for conditions such as image resolution and correct degree, and high identification rate.

Description

technical field [0001] The invention relates to a method for detecting chemical formulas in images based on chemical formula features, belonging to the fields of image processing and image recognition. Background technique [0002] Chemical formula image detection based on chemical formula features is not a common method in chemical formula image detection methods. When performing image detection based on chemical formula features, the image must first be preprocessed. Preprocessing generally includes grayscale transformation, binarization, tilt correction, image thinning, and so on. Then the image is segmented into characters, and whether it is a chemical formula image is judged by detecting the segmented characters. [0003] Various digital images stored in the computer, due to the introduction of noise during scanning or transmission (such as scanned e-books), will cause problems such as image tilt, image blur, and image breakpoints. In addition, chemical formula images...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06K9/46G06K9/52
CPCG06V30/416G06V30/418G06V10/422G06V10/42
Inventor 杨丽芳宋格格黄祥林陶竹林刘守训
Owner COMMUNICATION UNIVERSITY OF CHINA
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