Correction method for incomplete or deformed quadrangular image

A correction method and quadrilateral technology, which is applied in the field of identification of valuable documents, bills, and certificate images, and can solve the problem of long calculation time of edge detection algorithms.

Inactive Publication Date: 2014-03-26
GRG BAKING EQUIP CO LTD
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0010] In order to solve the problem of long calculation time of the edge detection algorithm in the prior art, the present invention provides a method for quickly performing edge detection and tilt correction for incomplete or deformed valuable documents, bills, and certificate images

Method used

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  • Correction method for incomplete or deformed quadrangular image
  • Correction method for incomplete or deformed quadrangular image
  • Correction method for incomplete or deformed quadrangular image

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Embodiment Construction

[0093] In order to further illustrate the method for correcting the incomplete or distorted quadrilateral image provided by the present invention, a further detailed introduction will be made below in conjunction with a diagram of a preferred embodiment of the present invention.

[0094] refer to figure 1 , the flow chart of the correction method for the incomplete or deformed quadrilateral image, the method includes five steps of edge point detection, abnormal edge point removal, straight line fitting, vertex calculation and image correction, the following steps are described in detail:

[0095] Step 1: Edge point detection.

[0096] During the imaging process of valuable documents, bills, and certificates, there are differences in the gray value of the image area and the background area. We can use this difference to quickly find the edge points on each side without being in the non-background gray scale range, avoiding the complicated calculations caused by various gradien...

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Abstract

The invention relates to a correction method for an incomplete or deformed quadrangular image. The method comprises the five steps of edge point detection, abnormal edge point elimination, linear fitting, vertex calculation and image correction. The correction method for the incomplete or deformed quadrangular image is applied to an identification method identification system for certificates such as valuable documents, notes, identification cards and the like, and can be used for rapidly performing edge detection and tilt correction on defect and deformed valuable documents, notes or certificate images.

Description

technical field [0001] The invention relates to the identification technology of valuable documents, bills and certificate images, in particular to the edge detection and correction method of the quadrilateral images of valuable documents such as banknotes in the financial field, bills such as train tickets, and certificates such as ID cards. Background technique [0002] In identification devices such as valuable documents, bills, certificates, etc., often due to placement or high-speed movement, the position is tilted, the movement is deformed, etc., so the images generated are mostly tilted and deformed images. Therefore, when performing its recognition, the first step is often to perform edge detection and tilt correction on the collected image, and then identify the content of the tilt-corrected image. Therefore, edge detection and tilt correction are important topics in the design of identification systems for valuable documents, bills, and certificates. [0003] Valu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T3/60G06T5/00G06T7/60
CPCG06T7/12G06T3/18G06T5/80
Inventor 王倩文游晶徐靖谢德浩
Owner GRG BAKING EQUIP CO LTD
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