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Practical binary document image tilt angle detection method

A technology of oblique angle and document image, which is applied in the directions of instruments, computing, character and pattern recognition, etc., can solve the problems of large amount of calculation, unfavorable, increased time and memory consumption, etc.

Inactive Publication Date: 2010-06-23
SHANDONG UNIV
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Problems solved by technology

Its disadvantage is that it has a large amount of calculation, and the larger detection range and higher detection accuracy will drastically increase the consumption of time and memory, which is undoubtedly very unfavorable for the practicality of batch document image tilt angle detection

Method used

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  • Practical binary document image tilt angle detection method
  • Practical binary document image tilt angle detection method
  • Practical binary document image tilt angle detection method

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Experimental program
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Embodiment

[0022] A practical binary document image tilt angle detection method, the flow chart is as follows figure 1 As shown, the detection method is as follows:

[0023] 1) When a foreground pixel is encountered in a document image, the row where the foreground pixel is located and the pixels in the upper and lower rows are centered on the foreground pixel, and L pixels are expanded to the left and right sides, and the pixel value is set to 1, and the L value is 7-10 ;

[0024] 2) Perform length filtering on the expanded image to remove isolated protruding parts in the image to obtain effective text line features;

[0025] 3) The image is smoothed and filtered using a template-based method. First, according to the characteristics of the expanded image, a 3×3 template is selected, and then the modules in the image that conform to the template are filled, cleared or connected to make the final image smoother;

[0026] 4) Thinning: Traversing the image, when a pixel with a pixel value...

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Abstract

The invention relates to a practical binary document image tilt angle detection method, which belongs to the technical field of image preprocessing. The detection method comprises: extending foreground pixels by traversing the foreground pixels in images to strengthen the characteristics of text lines, and then carrying out filtering smoothing; extracting edge characteristics by thinning algorithm, and then marking the pixels after thinning; counting up the number of pixel points, and filtering and binarizing the edge characteristics of the number of successive pixel points less than the threshold value; and finally, carrying out the Hough transformation for the images after processing, and detecting the tilt angle of the binary document images. The experiment proves that the invention has higher practical value.

Description

technical field [0001] The invention relates to a practical method for detecting the inclination angle of a binary document image, which belongs to the technical field of image preprocessing. Background technique [0002] In the process of document image acquisition, the scanned image will be more or less tilted to some extent. This tilt of the image will not only cause difficulties in the next step of character cutting, but also affect the final character recognition accuracy. Therefore, image tilt detection and correction is very important and becomes an important part of image preprocessing. [0003] For document image inclination detection, although there are few real straight lines in the document image, there is a strong directionality between the text lines in the image, so the inclination angle can be obtained by detecting the direction of the text lines in the image. At present, the main methods of document image tilt angle detection include: Hough transform method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/32
Inventor 马磊李文成刘江裴小根
Owner SHANDONG UNIV
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