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Round small target accurate detection method based on image

A detection method and small target technology, applied in the field of image processing, can solve the problems of random Hough transform method detection accuracy, small target imaging size, etc.

Inactive Publication Date: 2013-06-12
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

However, the small size of the target image will also affect the detection accuracy of the random Hough transform method

Method used

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  • Round small target accurate detection method based on image
  • Round small target accurate detection method based on image
  • Round small target accurate detection method based on image

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Embodiment Construction

[0059] Below, the embodiments of the present invention will be described in detail in conjunction with the accompanying drawings: this embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following the described embodiment.

[0060] like figure 1 , this embodiment includes the following steps:

[0061] (1) Select the color integrated camera model CNB-A1263PL. This type of camera uses 1 / 4inch SONY IT CCD as the image sensor on the lens to collect the target video image in PAL system in real time. The image pixel size is 768×576. like figure 2 As shown, wherein the circular object composed of a white outer ring and a black inner circle is the detection target of the present invention, and is marked with a box in the figure;

[0062] (2) Perform color space conversion on the original...

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Abstract

The invention discloses a round small target accurate detection method based on an image, and solves the problems that the target is hard to be detected or the detection precision is low due to small target imaging. The method comprises the following steps of fast positioning a round small target by utilizing improved random Hough transform at the initial detection stage, and extracting a small range ROI (region of interest) in the image; and at the secondary accurate detection stage, obtaining sample points of boundary in the target through a centering eight-directional searching method, and solving the accurate detection result of the round small target by adopting a least squares fitting method. The method provided by the invention can be used for accurately identifying and detecting the round small target from the complex background, ensuring the fastness of the initial detection by utilizing the improved random Hough transform, and further improving the precision through a secondary detection way.

Description

technical field [0001] The invention belongs to the technical field of image processing, and relates to a method for precise detection of small circular targets based on image technology. Background technique [0002] The real-time detection technology of moving targets based on image technology has a wide range of application values ​​in intelligent transportation systems, intelligent monitoring systems, military target detection, and instrument positioning in medical navigation operations. Industrial sites, military applications, medical meteorology and many other fields often need to quickly detect moving objects with circular features for further analysis and processing. [0003] Among the detection methods based on shape features, Hough Transform (HT) is one of the basic methods for recognizing geometric shapes in images, especially an effective method for detecting circles. The Hough transform uses the space duality relationship to convert the problem of the original ...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06T5/00
Inventor 张翼孙永荣刘晓俊王潇潇熊智杨博文
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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