Banknote image inclination correction and region extraction method

A technology for image and area extraction of banknotes, applied in image enhancement, image analysis, image data processing, etc., can solve the problems of Hough transform edge extraction error, edge becoming old, banknote edge wear and so on

Active Publication Date: 2015-07-29
广州南沙资讯科技园有限公司博士后科研工作站
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Problems solved by technology

However, there are two reasons that affect the accuracy of Hough transform to extract the edges of banknotes: one is that after the banknotes have been used for a long ti

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  • Banknote image inclination correction and region extraction method
  • Banknote image inclination correction and region extraction method
  • Banknote image inclination correction and region extraction method

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Embodiment Construction

[0019] The banknote image tilt correction and region extraction method of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] First, some terms used in this embodiment will be briefly explained.

[0021] HOUGH transform: Hough transform (Hough Transform), Hough transform was proposed by Paul Hough in 1962, and was published as a patent in the United States. What it realizes is a mapping relationship from image space to parameter space. The essence of the Hough transform is to cluster the pixels with a certain relationship in the image space, and to find the cumulative corresponding points in the parameter space that can connect these pixels with a certain analytical form.

[0022] Membership function: If there is a number A(x)∈{0, 1} corresponding to any element x in the domain of discourse (the scope of research) U, then A is called a fuzzy set on U, and A (x) is called the membership degree ...

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Abstract

The invention discloses a banknote image inclination correction and region extraction method, which is characterized by comprising the steps of carrying out fuzzy enhancement on an acquired banknote image, and enhancing a contrast ratio between a banknote and a banknote background color or pattern; segmenting the banknote image, wherein the banknote image is segmented into a banknote background region and a banknote region; scanning to acquire edge pixels of an image of the banknote region; acquiring image edges of the banknote region by adopting least square method straight line fitting if the banknote edges are uneven or zigzag-shaped, calculating fitting errors of the image edges of the banknote region, and calculating an inclination angle of the image of the banknote region according to the image edge, whose fitting error is minimum, of the banknote region; carrying out inclination correction on the image of the banknote region according to the inclination angle of the image of the banknote region, and rotating the inclined image of the banknote region into a horizontal image; and extraction the banknote region. According to the invention, fuzzy enhancement is carried out on the banknote image, the banknote edges are acquired by least square method straight line fitting, the accuracy in inclination correction for the banknote image is improved, and the extraction effect of the banknote region is good.

Description

technical field [0001] The invention relates to a computer image processing technology, in particular to a banknote image tilt correction and area extraction method. Background technique [0002] Currency is the medium of commodity exchange and the companion of human economic development and trade process. Paper money occupies an important position in the long history of currency. With the circulation and development of various forms of currency, even today when electronic money begins to rise, cash circulation of paper money is still the most important way of currency circulation in the international financial circle. At present, people often use methods such as magnetic ink detection, ultraviolet fluorescence detection and infrared penetration detection to identify the authenticity of banknotes, and identify the face value by detecting the size of banknotes. These methods obtain single information and cannot identify incomplete, polluted and worn banknotes, let alone ident...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06T5/00G06T3/60
Inventor 刘习文薛家祥
Owner 广州南沙资讯科技园有限公司博士后科研工作站
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