Document image source judgment method based on linear continuity

A technology of document image and discriminant method, which is applied in character and pattern recognition, instruments, computer components, etc., can solve problems such as misleading results and inaccurate classification, achieve good time performance, high classification accuracy, and overcome non-slanted scanning The effect that the document cannot judge

Active Publication Date: 2014-11-26
XI AN JIAOTONG UNIV
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Problems solved by technology

However, filtering is difficult to obtain an ideal result when processing binary images with less information, and some raster images have halftones to represent gray patterns, which further misleads the filtered results and eventually leads to incorrect classification. precise

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  • Document image source judgment method based on linear continuity
  • Document image source judgment method based on linear continuity
  • Document image source judgment method based on linear continuity

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Embodiment Construction

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] Such as figure 1 As shown, a document image source discrimination method based on straight line continuity in the present invention mainly includes three parts: the straight line segment and isolated noise point detection part, the calculation base straight line length part and the straight line continuity feature construction and classification part. The specific method is as follows:

[0030] Step 1: Perform an edge extraction operation on the input binary image, and output the edge image with the filled part removed;

[0031] Step 2: Detection of straight line segments and isolated noise points: For the edge image output in step 1, first use a 3*N line detection template to detect a straight line segment with a pixel length of N. The specific detection process is: use one and 3*N The window of the same size as the line det...

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Abstract

Disclosed is a document image source judgment method based on linear continuity. Firstly, operation of edge extraction is carried out on an input binary image, then linear section detection in the horizontal and vertical detections is carried out through a 3*N linear detection template, and complete linear sections and isolated noise points in partial areas at the two ends of the linear sections are obtained through search; bidirectional extension search is carried out on each detected linear section to obtain the length of a substrate straight line corresponding to the linear section; the linear sections are classified according to the length of the substrate straight lines, the specific value of the length of the linear section and the length of the substrate length in each class is calculated to serve as a feature, the specific value of the number of the isolated noise points and the number of the linear sections serves as an additional feature, is added and then is input into a trained SVM classifier to be classified, and the type of the image is output finally. The document image source judgment method based on linear continuity fills the blank of a binary document image source judgment method, guarantees that no erroneous judgment is generated, and can rapidly distinguish most document images containing straight lines.

Description

technical field [0001] The present invention relates to the technical field of a method for discriminating the source of a document image, in particular to a method for discriminating the source of a document image based on straight line continuity. Background technique [0002] Document images can be classified into scanned images and raster images according to their production sources. The image storage can be divided into color image, grayscale image and binary image according to the amount of information stored in each pixel. [0003] At present, the algorithm research on the source identification of document images can be divided into three categories: [0004] One is based on the method of document tilt detection, which is mainly aimed at the situation that the early scanned document images often have overall tilt. This type of method generally first obtains a whole line of text or a blank area between lines of text, and calculates the angle between the line of text ...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06K9/62
Inventor 宋永红郁冲张元林
Owner XI AN JIAOTONG UNIV
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