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Identification method for rectangular area based on improved shape angle calculation

A recognition method and rectangular area technology, applied in the field of image processing, target recognition, and detection, can solve the problems of high complexity, slow calculation speed, and low accuracy of rectangular area detection algorithms

Inactive Publication Date: 2015-03-11
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of high complexity, slow calculation speed and low accuracy in the rectangular area detection algorithm in the prior art, and propose a method that can quickly and accurately identify the rectangular target in the image

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  • Identification method for rectangular area based on improved shape angle calculation
  • Identification method for rectangular area based on improved shape angle calculation
  • Identification method for rectangular area based on improved shape angle calculation

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Embodiment Construction

[0045] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0046] The flow chart of the rectangular area recognition method based on the improved shape angle calculation of the present invention is as follows figure 1 As shown, it mainly includes the following steps:

[0047] S1. Obtain the digital image f(x,y) of the detection object through the image acquisition device, such as figure 2 shown.

[0048] S2. Through image processing technology, extract the contours of all targets to be measured in the digital image f(x, y), and number C k (x,y), where k=1,2,...,8, such as image 3 shown, corresponding to Figure 4 (a) ~ (h) in.

[0049] S3. Select contour C 1 (x,y), C 5 (x,y) and C 7 The regular rectangle corresponding to (x, y) is used as three different types of rectangular templates, where n is 0.84, 1 and 0.38 respectively, and its shape angle can be calculated according to formula (2):

[0050] ...

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Abstract

The invention discloses an identification method for a rectangular area based on improved shape angle calculation. The identification method mainly comprises the following steps: S1, acquiring a detection image; S2, extracting all contours in the image and numbering; S3, selecting a template and calculating a shape angle of the template according to a classic shape angle calculation theory; S4, calculating shape angles of all the contours by adopting an improved method; S5, comparing the shape angles of all the contours with the shape angle of the template, setting a deviation threshold, and obtaining the contour similar to the template; S6, calculating and comparing the number of pixels in the template contour with that of the pixels in the contour similar to the template to obtain the contour belonging to the same kind with the template. Compared with the prior art, the method disclosed by the invention has the advantages that quick identification of the rectangular area based on the shape angle is realized, the calculation efficiency of the existing shape angle is improved, and quick identification of the rectangular area in an image target is realized.

Description

technical field [0001] The invention belongs to the technical field of image processing and target recognition and detection, and in particular relates to a rectangular area recognition method based on improved shape angle calculation. Background technique [0002] Rectangular area detection has a wide range of applications in industrial product detection, integrated circuit board online quality detection and other fields. The traditional rectangular area detection algorithm is mainly based on the Hough transform and its derivatives. These methods usually need to perform voting calculations in 2D or 3D space, resulting in problems such as high algorithm time complexity and slow calculation speed, and cannot meet the requirements of rapid detection on the production line. In recent years, the rectangular area detection method based on the shape angle theory ignores the position, direction, size and other information of the contour during the rectangle recognition process, an...

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Application Information

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IPC IPC(8): G06T7/00G06K9/46
CPCG06T7/0004G06T7/62G06T2207/30108G06T2207/30148
Inventor 方黎勇孟伟荣
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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