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Character region positioning method and device

A text area and positioning method technology, applied in the field of image processing, can solve problems such as tediousness and reduced computing efficiency

Active Publication Date: 2018-09-25
BEIJING JINGDONG SHANGKE INFORMATION TECH CO LTD +1
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  • Claims
  • Application Information

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Problems solved by technology

In addition, these two methods can only locate the text area first, and an additional algorithm is required to string a single text into a row, which is cumbersome and reduces the calculation efficiency

Method used

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  • Character region positioning method and device
  • Character region positioning method and device
  • Character region positioning method and device

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Embodiment Construction

[0046] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0047] The flowchart of an embodiment of the text area positioning method of the present invention is as follows Figure 5 shown.

[0048] In step 501, a variance map is obtained according to the original image. In one embodiment, the pixel value variance between each pixel point in the image and several surrounding pixel points can be obtained according to the pixel value of each point in the original image, such as taking the variance according to the pixel values ​​of several consecutive horizontal points, and determining where Variance map pixels for a point. A variogram is determined by computing the variance of each point from the pixel values ​​of several surrounding points.

[0049] In step 502, an edge image of the variance map is obtained. In one embodiment, any edge detection algorithm in the prior art m...

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Abstract

The invention provides a character region positioning method and device and relates to the field of image processing. The method comprises steps of according to an original image, acquiring a variancegraph; acquiring edge images of the variance graph; and if a difference value of the distance between edge points relative to positions in adjacent two edge lines in the edge image is in a preset distance difference range, determining the region between adjacent two edge lines to be a character region. In this way, by use of the characteristic that characters in the character region are highly similar to each other, and according to the distance between edge lines in the edge image, the character region is determined, so effects caused by change of thickness of character strokes will be avoided; the method and the device are suitable to all kinds of different characters; effects on positioning caused by complex pixel change conditions of images can be avoided; and accuracy of positioningof the character regions is improved.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a method and device for locating a character area. Background technique [0002] In the text recognition process, it is necessary to use some algorithms to locate the text area in the picture, and then use the relevant image algorithm to extract the text content in the text area. Therefore, text positioning is an important module of the text recognition engine. Currently commonly used methods are stroke width positioning method (Stroke Width Transform) and stable extreme value region detection method (Maximally Stable Extremal Regions). [0003] The stroke width positioning method uses the characteristic that the stroke width of the printed text is constant, searches for a pair of parallel lines in a picture, determines the parallel lines as strokes, and then gathers the strokes that are close to each other into a text area. FIG. 1 is a schematic diagram of character positioning ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/20G06K9/46
CPCG06V10/22G06V10/44G06V30/10G06V30/413G06V20/62G06V30/287
Inventor 王永亮王青泽陈标龙
Owner BEIJING JINGDONG SHANGKE INFORMATION TECH CO LTD
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