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Method and equipment for generating text character string according to image

A text string and image generation technology, applied in character and pattern recognition, image enhancement, image data processing, etc., can solve the problem of reduced accuracy of text extraction

Inactive Publication Date: 2012-10-24
CANON KK
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  • Summary
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Problems solved by technology

Also, most current methods can only detect horizontally or vertically aligned text strings
Also, if the background of the image is very complex, the accuracy of text extraction will also decrease

Method used

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  • Method and equipment for generating text character string according to image
  • Method and equipment for generating text character string according to image
  • Method and equipment for generating text character string according to image

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Embodiment Construction

[0027] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0028] figure 1 is a flowchart showing the overall process of extracting text in a natural image according to an embodiment of the present invention. Such as figure 1 As shown, the process of extracting text according to the present embodiment consists of five main stages: two kinds of edge images are detected on the input image: "dark" edge images and "bright" edge images (step S100); Find connected components (step S200) on the edge image; remove non-text components (step S300) as much as possible; use Hough transform (Hough transform) to group together the components on the same straight line (step S400); and according to The component group generates a text string (step S500).

[0029] The first step is to detect edges on the input image (original natural image) (step S100). Connected components will be generated based on the detected edg...

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Abstract

The invention provides a method and a device for generating a text character string according to an image. The method comprises the following steps: generating an edge image through detecting an edge on the image; seeking connection components on the edge image; removing the connection components meeting the predetermined condition from the sought connection components; grouping the connection components existing on the same straight line together from the reserved connection components after the removal; and generating the text character string based on the grouped connection components.

Description

technical field [0001] The present invention relates to a method and device for generating text strings from images, in particular to a method and device for automatically extracting text from natural images. Background technique [0002] Text extraction from natural images has very wide applications, such as license plate location and content-based image / video indexing, among others. However, variations in text due to differences in size, style, orientation, and alignment, as well as low image contrast and complex backgrounds make automatic text extraction a very challenging problem. [0003] Various methods for extracting text from images and videos have been proposed for specific applications (References 1 to 3). According to the utilized features, text extraction methods can be divided into two types: region-based methods and texture-based methods. [0004] Region-based methods can be further divided into two sub-methods: connected component (hereinafter referred to as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00G06K9/46G06T5/00
Inventor 胥立丰张宏志王艳清
Owner CANON KK
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