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Automatic typeface directioning and positioning method for known tables

A positioning method and table technology, applied in character and pattern recognition, instruments, computer parts, etc., can solve problems such as affecting the delineation effect, interference, and poor feature point extraction effect, so as to reduce manual work and improve input. The effect of precision and efficiency

Inactive Publication Date: 2007-01-10
北京大学计算机科学技术研究所 +1
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Problems solved by technology

The disadvantage is that when there is interference in the image, the feature point extraction effect is often poor, or due to the instability of the scanning resolution during the scanning process, there is a large error in the calculation of the offset or scaling ratio of the table, which affects the effect of line removal; In automatic document feeding mode (ADF) scanning, since the bald head does not move and the paper moves, when there are dirty spots between the bald head and the paper, there will be linear interference in the scanned image, which seriously affects the effect of table positioning and line removal; In addition, when there is interference in the table feature points used for positioning, or the feature points cannot be extracted for some reason, the positioning and scaling ratio calculation will not be possible

Method used

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  • Automatic typeface directioning and positioning method for known tables
  • Automatic typeface directioning and positioning method for known tables
  • Automatic typeface directioning and positioning method for known tables

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Embodiment Construction

[0032] The embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0033] figure 1 Listed the schematic flow sheet of each step method of the present invention, comprises the following steps:

[0034] 1. Image preprocessing

[0035] First digitize the original form image ( image 3 ) to perform binarization and skew correction operations according to conventional methods. In this implementation process, the Otsu method is used for binarization, and the skew correction uses the projection map to find the highest peak of the continuous line segment, and uses the Hough transform to search for the inclination angle;

[0036] 2. Extract the position information of vertical lines and horizontal lines from the image of the form to be recognized. You can use the projection diagram to find the position of the highest peak of the continuous line segment, and obtain the position set of the form line to be recogniz...

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Abstract

An automatic directional and positioned method of space for known table includes picking up table line automatically with computer, matching the line and determining table direction, utilizing least square method to position table accurately and to calculate out magnification ratio.

Description

technical field [0001] The invention relates to a pattern recognition technology in the field of computer information processing, in particular to an automatic layout orientation and positioning method of a known form. Background technique [0002] An important application of OCR technology is the input and processing of forms. At present, there are a large number of special forms, such as various bills, reports, etc., whose remarkable feature is that the style of the form is known in advance (that is, the known form), and the input focuses on the text and data information in it. [0003] In the prior art, for this type of special form, the entry process through the computer system includes the scanning process, preprocessing processes such as binarization and skew correction, layout analysis and cutting, identification, proofreading and other steps. Among them, steps such as scanning and proofreading require manual intervention. When entering a large number of forms, it i...

Claims

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Application Information

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IPC IPC(8): G06K9/54G06K9/38G06K9/52
Inventor 徐剑波
Owner 北京大学计算机科学技术研究所
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