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Character image processing method and device

An image processing and image technology, applied in image data processing, image analysis, character and pattern recognition, etc., can solve the problems of the quality of text and images, achieve the effect of rapid positioning, improve accuracy and speed

Inactive Publication Date: 2018-01-19
BEIJING YUANXIN SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, methods based on gradient operators, such as Canny operator and Sobel operator, have more coherent edge extraction and good detail preservation, but affected by the quality of text images, the extracted edges often contain false edges.

Method used

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  • Character image processing method and device
  • Character image processing method and device
  • Character image processing method and device

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Embodiment Construction

[0037] Embodiments and examples of the present invention will be described in detail below with reference to the drawings.

[0038] The scope of applicability of the present invention will become apparent from the detailed description given below. It should be understood, however, that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are given for purposes of illustration only.

[0039] figure 1 A flowchart of an embodiment of the text image processing method according to the present invention is shown.

[0040] In this specification, the term "text image" refers to an image that contains or may contain text.

[0041] In step S102, preprocessing is performed on the acquired character image to be recognized. For example, tilt correction is performed on the image as needed to correct the image. At present, the algorithm of tilt correction is relatively mature. Here, the method based on Hough transform can be used to ...

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Abstract

The application discloses a character image processing method and device. The method includes: uniformly dividing a grayscale image of the character image into a plurality of rectangular grid portions; for each grid portion, calculating a histogram, and carrying out equalization processing on the histogram; and carrying out equalization processing on the entire image through interpolation of the histograms of the adjacent grid portions to obtain an equalized image. According to the method and device of the invention, quality of the character image can be improved, character contours in the image are enabled to be liable to be more accurately obtained, and increasing an accuracy rate and a speed of character recognition is facilitated.

Description

technical field [0001] The present application relates to the field of printed or written character recognition, in particular to a text image processing method and device. Background technique [0002] With the widespread use of image acquisition equipment such as digital cameras, cameras, and scanners, the information in images has attracted more and more attention, and images have gradually become the main body of information exchange. Optical Character Recognition (OCR) technology emerges at the historic moment, through this technology, the device can recognize the text information in the image. [0003] In the prior art, image binarization (or finding a threshold) is usually the first step of an OCR system, which converts a grayscale image into a binary form representing text and background respectively, and the recognition rate of OCR is mainly based on a binary image the quality of. However, for text images with poor contrast or complex backgrounds, it is difficult ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/34G06K9/46G06T7/11G06T7/13G06T7/136G06T7/194
Inventor 奚智
Owner BEIJING YUANXIN SCI & TECH
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