Method and device for extracting text from image

An image and text technology, applied in character and pattern recognition, special data processing applications, instruments, etc., can solve problems such as difficult to extract connected domains, poor algorithm robustness, text size and font sensitivity, etc.

Active Publication Date: 2011-06-01
CHINA MOBILE GRP GUANGDONG CO LTD
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Problems solved by technology

[0007] In the methods of the prior art, the region-based method is difficult to extract accurate connected domains when the image background is complex or the image quality is poor. In addition, the formulation of heuristic rules used in the selection of text regions depends on prior knowledge , and these prior knowledge are generally difficult to obtain accurately, and the determination of many thresholds is rigid, resulting in

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  • Method and device for extracting text from image
  • Method and device for extracting text from image
  • Method and device for extracting text from image

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Embodiment Construction

[0092] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0093] refer to figure 1 , the method for detecting text from an image in the embodiment of the present invention mainly includes the following steps:

[0094] Step 101: performing grayscale nonlinear dynamic compression on the original image to obtain an enhanced image;

[0095] In the process of image generation, transmission or transformation, the quality of the image is degraded due to the influence of various factors. By performing gray-scale nonlinear dynamic compression on the original image, it can fully highlight the edge, texture and other attribute characteristics of the image, and suppress Useless information, improve the use value of the image, and provide more distinctive features for subsequent text region extraction. Specific steps...

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Abstract

The invention provides a method and device for extracting a text from an image. The method comprises the following steps: carrying out grey level nonlinear dynamic compression on an original image to obtain an enhanced image; extracting textural characteristics and edge characteristics of the enhanced image; constructing the textural characteristics and the edge characteristics into homogeneous characteristics, and mapping the enhanced image to a homogeneous space according to the homogeneous characteristics to obtain a characteristic image; extracting a text area from the characteristic image by a text area detector; and extracting and identifying characters from the text area of the enhanced image. According to the invention, the accuracy and robustness in text detection can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of pattern recognition and computer vision, in particular to a method and device for extracting text from images. Background technique [0002] With the development of multimedia information retrieval, Internet and 3G network streaming media technology, images and videos have become the mainstream information carriers for multimedia information exchange and services. The text information in images and videos is becoming more and more important to the expression and retrieval of massive information. How to realize the automatic detection and extraction of text in images is the first step to realize image retrieval and image sensitivity discrimination based on text information. [0003] The text area in the image has features that are significantly different from the non-text area. For example, the text area has rich edges and special textures. Usually, the text area is composed of one or more lines of text, a...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06K9/46G06K9/62G06F17/30
Inventor 舒波孔轶陈东明李英黄昭文李志锋吕汉鑫黄克书林茂陈涛雷志勇余士韬
Owner CHINA MOBILE GRP GUANGDONG CO LTD
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