Form line extraction method integrating global information and local information

A technology of local information and extraction methods, applied in the fields of image processing and computer vision, can solve the problems of relying on prior information and weak general applicability, achieve good general applicability, improve stability and accuracy, and improve execution speed. Effect

Active Publication Date: 2013-08-21
SICHUAN UNIV
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  • Abstract
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Problems solved by technology

This method relies on prior info...

Method used

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  • Form line extraction method integrating global information and local information
  • Form line extraction method integrating global information and local information
  • Form line extraction method integrating global information and local information

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Embodiment Construction

[0039] Embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0040] refer to figure 1 , the specific implementation steps of extracting table lines in the image are as follows:

[0041] Step 1: Input an image containing a table and convert it into a 256-level grayscale image.

[0042] Step 2: Use the Gaussian kernel function to smooth the image and remove some noise points in the image.

[0043] Step 3: In order to overcome the poor segmentation effect of a single threshold caused by uneven illumination, different segmentation thresholds are used for different local regions of the image. A local image window is established, and the image in each window is segmented by threshold value to obtain a binarized window image. The final entire binary image is obtained by fusing all binary window images. The specific implementation steps are as follows:

[0044] (1) Set the shape, size and window layout of the wind...

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Abstract

A form line extraction method integrating global information and local information combines local information and global information in an image. Firstly, smooth denoising is carried out on a grayscale image, and secondly image binaryzation based on an overlapping window is carried out; then a local contour in a foreground area is extracted, and straight line sections in the image are detected through local contour information; grids are set up by using of a projection histogram method, global distributed information of a form on the image is obtained, and the general location of the form is determined; at last, the straight line sections are connected in the range of the grids, so the whole form line is extracted. According to experimental result statistics, the false detection rate is less than 5% and the omission ratio is less than 3% according to the form line extraction method for exacting the form line in the image.

Description

technical field [0001] The invention relates to the technical fields of image processing and computer vision, in particular to a method for accurately extracting form lines from form images. Background technique [0002] As a form of information expression, tables have been widely used in various fields. People often need to deal with various tables in their daily work, study and life. At present, most forms are still based on paper documents. With the development of information technology, it is an inevitable trend to use computers to process and store documents. Digital information that can be processed. The traditional manual entry method has many obvious defects, such as high labor cost, slow speed, error-prone and so on. Using computer image processing technology to automatically identify and input form images will greatly improve the work efficiency of form processing. [0003] It is the main research direction of document image processing at home and abroad by taki...

Claims

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Application Information

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IPC IPC(8): G06K9/46G06K9/20
Inventor 王俊峰高琳姬郁林李虹
Owner SICHUAN UNIV
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