Method, device and system for accurately locating characters in an image

An accurate positioning, in-image technology, applied in the field of optical character recognition, can solve the problems of high environmental requirements and low processing efficiency that cannot meet the precise positioning of the module end, recognition, and reduce memory requirements and calculation loss, and achieve good positioning effect. , the effect of fast processing

Active Publication Date: 2019-08-20
杭州泽火科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] To sum up, the existing automatic character positioning algorithm has the following defects: complex algorithm, low processing efficiency, and low positioning accuracy; it has high requirements for the recognition environment, and cannot meet the precise positioning requirements of the module side in various business environments

Method used

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  • Method, device and system for accurately locating characters in an image
  • Method, device and system for accurately locating characters in an image
  • Method, device and system for accurately locating characters in an image

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Embodiment Construction

[0056] Embodiments of the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, so they are only examples, and should not be used to limit the protection scope of the present invention.

[0057] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application shall have the usual meanings understood by those skilled in the art to which the present invention belongs.

[0058] To facilitate the understanding of this embodiment, firstly, the terms that may be involved are explained.

[0059] Image I is a vector matrix whose width and height are w and h respectively, and each vector in the matrix is ​​a color value (b, g, r) or a gray value (g).

[0060] The affine coordinate x defines the affine coordinate [x,y,1] of a point in the image.

[00...

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Abstract

The invention specifically relates to a method, device and system for accurately locating characters in an image. The method provided by the present invention includes: step S1, initializing the affine transformation matrix and character area distribution probability; step S2, performing histogram statistics on the pixel values ​​of the image according to the character area distribution probability; step S3, according to the histogram statistical results and The character region distribution probability iteratively updates the affine transformation matrix; step S4, updates the character region distribution probability according to the updated affine transformation matrix; step S5, repeats steps S2-step S4, until the first termination condition is met; step S6, The position of the character in the image is obtained according to the finally determined distribution probability of the character area. The method, device and system for accurately locating characters in an image provided by the present invention can achieve accurate locating results only by using histograms and regional locating matrix iterations similar to the optical flow method. The processing speed is fast and the locating effect is good, which can be directly applied to Low-cost module-side identification.

Description

technical field [0001] The invention relates to the technical field of optical character recognition, in particular to a method, device and system for accurately locating characters in an image. Background technique [0002] Character recognition under low-cost embedded modules needs to be precisely positioned for multiple characters (such as 5 digits) in advance, otherwise the actual cost of recognition cannot be solved. The existing technology needs to transmit the image to the host computer for precise positioning of the characters, which cannot meet the needs of precise positioning of the module side in various business environments. [0003] There are three main types of existing character automatic positioning algorithms: [0004] (1) Matching based on feature points: Calculate some fixed features of the character boundary area for feature point matching, calculate the affine matrix (Affine Transform Matrix) according to the matching, realize the affine transformation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/32G06K9/46
CPCG06V30/1478G06V10/50
Inventor 朱钱虎
Owner 杭州泽火科技有限公司
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