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Method and system for detecting elliptical target in image

An elliptical, image-based technology, applied in the field of image processing, can solve problems such as low detection accuracy, slow detection speed, and large computer memory requirements, and achieve high detection accuracy, reduce computing pressure, and small computing memory requirements.

Inactive Publication Date: 2013-04-03
SHENZHEN LANDWIND IND
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Problems solved by technology

[0015] Aiming at the technical defects of slow detection speed, large computer memory requirement and low detection accuracy in the ellipse detection process of the prior art, the present invention proposes a method and system for detecting an ellipse-shaped target with fast detection speed and high precision

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  • Method and system for detecting elliptical target in image
  • Method and system for detecting elliptical target in image

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Embodiment Construction

[0055] The detection method of the elliptical target in the image proposed by the invention is suitable for the application occasions that need to detect the elliptical target existing in the image.

[0056] refer to figure 1 In a preferred embodiment shown, the ellipse target detection method that the present invention proposes has following implementation steps:

[0057] Step S11: Acquiring an image I (hereinafter referred to as "original image") that requires image processing (ie elliptical object detection). If the noise in the original image is obvious, such as speckle noise in the ultrasound B-mode image, you can perform noise reduction processing on the original image. Let the number of iterations Iter be 0.

[0058] Step S12: Process the original image using an edge detection method to obtain a binarized edge image.

[0059] In a preferred solution, a gradient-based edge detection method is used. The transverse gradient Sobel operator g x and the longitudinal grad...

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Abstract

The invention discloses a method and a system for detecting an elliptical target in an image. The method comprises the following steps of: A. giving an image, and obtaining an edge image by using an edge detection or ridge detection algorithm; B. extracting line segments from the edge image, and generating a line segment list; C. randomly extracting L line segments from the line segment list, and carrying out ellipse fitting by using the L line segments, and combining an ellipse fitting result into a candidate parameter list when the ellipse fitting result passes validation; and D. repeating the step C till a stop condition is met, and selecting and outputting ellipse candidate elements being in line with conditions from the candidate parameter list. The method and the system have the advantages of fast operating rate, low requirement on computation memory, and high detection accuracy.

Description

technical field [0001] The invention relates to an image processing technology, in particular to a method for automatically detecting an ellipse-shaped target in an image, and a system using the processing method. Background technique [0002] Ellipse object detection is a key problem in computer vision, and its results are usually widely used as primitives in image matching, recognition, analysis and understanding. Therefore, ellipse detection has a wide range of application scenarios in industrial manufacturing, biomedicine and other fields. [0003] In analytic geometry, an ellipse can be composed of a series of points on the Cartesian plane and satisfy the following implicit equation under non-degenerate conditions: F(a,x)=a x=ax 2 +bxy+cy 2 +dx+ey+f=0, where a=[a b c d e f] T , x=[x 2 xy y 2 x y 1] T , x and y are the abscissa and ordinate of the point on the ellipse, respectively. The parameter a can be transformed into a more commonly used ellipse parameter c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/46
Inventor 陆汇海刘龙
Owner SHENZHEN LANDWIND IND
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