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Correction method for patent certificate image with any inclination angle

A technology of tilt angle and correction method, applied in image analysis, image data processing, graphics and image conversion, etc., can solve the problems of high work intensity and low work efficiency of operators, reduce labor intensity, improve work efficiency, and accurately tilt Correction effect

Inactive Publication Date: 2013-09-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for patent certificate images with any inclination angle in view of the existing problem that the tilt correction of the patent certificate image can only rely on manual correction, the operator's work intensity is high, and the work efficiency is low. Correction method, providing a simple and effective method for tilt correction of patent certificate images

Method used

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  • Correction method for patent certificate image with any inclination angle
  • Correction method for patent certificate image with any inclination angle
  • Correction method for patent certificate image with any inclination angle

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Embodiment Construction

[0040] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0041] Such as figure 1 Shown is the flowchart of the present invention.

[0042] Take the 80 selected images of tilted patent certificates obtained by artificial rotation at any angle as an example.

[0043] The performance indicators of this method are the speed and precision of the algorithm. The speed of the algorithm is mainly reflected in the average time required for inclination detection and tilt correction. The accuracy of the algorithm is measured by the accuracy of the correction.

[0044] Step A: If figure 2 As shown, input the image of the patent certificate to be corrected, and perform grayscale processing on the image of the patent certificate to be corrected;

[0045] Step B: Filter the input grayscale image of the patent certificate to be corrected to obtain the filtered image, which uses the cvSmooth library function in Op...

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Abstract

The invention discloses a correction method for a patent certificate image with any inclination angle. The correction method comprises the following steps: graying the input patent certificate image and then performing Gaussian filter; performing Canny edge detection on the filtered image to obtain a basic skeleton line of the certificate image; acquiring the inclination angle of the skeleton line by using Hough transformation; obtaining the inclination angle of the first correction according to the principle that the minority is subordinate to the majority and then rotating the image; next, judging the inclination angle of the second correction according to the position of a round stamp in the certificate image corrected for the first time; and rotating the image according to the inclination angle to finally finish the inclination correction of the patent certificate image.

Description

technical field [0001] The invention relates to a correction method for an inclined patent certificate image, in particular to a correction method for an arbitrary inclined angle patent certificate image. Background technique [0002] As a proof of past achievements, certificate images are widely used to apply for awards or company expansion, and one of the most important certificate images is the patent certificate image. Using image processing and pattern recognition to ensure the correct use of patent certificates is an increasingly important topic. Patent certificate images are generally collected by scanners or cameras, and some have to be transmitted through the Internet, which inevitably introduces a certain degree of inclination, which will have a significant impact on subsequent image retrieval and recognition. In the prior art, it is usually only possible to manually correct and re-scan to obtain an image without skew after the certificate scan is found to be tilt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T3/60G06T7/00
Inventor 刘献如黄玲张昊龙军张祖平
Owner CENT SOUTH UNIV
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