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Symmetry image symmetric axis detection positioning method

A positioning method, a technology of symmetry axis, applied in image analysis, image data processing, instruments, etc., can solve problems such as poor algorithm robustness, and achieve the effect of enhancing robustness, wide application range, and avoiding errors

Active Publication Date: 2015-12-23
HUAZHONG UNIV OF SCI & TECH
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  • Claims
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Problems solved by technology

[0004] Most of the above algorithms are processed for specific types of images, such as MRI images, missile images, etc. The experimental images used by some algorithms are relatively clear, the application range has certain limitations, and the robustness of the algorithm is poor

Method used

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  • Symmetry image symmetric axis detection positioning method
  • Symmetry image symmetric axis detection positioning method
  • Symmetry image symmetric axis detection positioning method

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Embodiment Construction

[0037] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] The invention utilizes the edge gradient of the symmetric image and the principle of Hough transform to realize the precise detection and positioning of the symmetry axis of the symmetric image. Specifically: Sobel edge detection is performed on the input image to be detected; for each edge point, the distribution of the gradient size and direction of all pixels in a fixed size neighborhood center...

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Abstract

The invention discloses a symmetry image symmetric axis detection positioning method, comprising steps of (1) extracting a rim of an image, (2) performing rim point gradient calculation, (3) calculating the midperpendicular direction between a rim point pair and a weight, (4) mapping a polar coordinate and finding an optimal symmetric axis. The invention utilizes the symmetry of the symmetry image edge point gradient direction, calculating the midperpendicular of any two rim points by aiming for the rim point set, calculating the mapping weight of the midperpendicular according to the gradient direction to form an axle wire to be chosen, utilizing a Hough transformation mapping mechanism, utilizing a standard polar coordinate formulation to descript the midperpendiculars to be chosen, accumulating the mapping weight on the corresponding polar position, and choosing the weight and the biggest polar coordinate as a preferable midperpendicular.

Description

Technical field [0001] The invention belongs to the field of image processing and pattern recognition, and more specifically, relates to a method for detecting and positioning a symmetry axis of a symmetric image. Background technique [0002] In the description of visual features, symmetry is an important content. Symmetrical objects can be seen everywhere in nature, and through the characteristics of symmetry, many judgments can be made to guide visual object detection, feature extraction and recognition processes. At present, the symmetry detection in image processing still has shortcomings due to various reasons. Extracting the axis of symmetry from the image is important for pattern recognition and image processing. The detection of the symmetry axis of an object is of great significance to object shape matching, model matching, object recognition and positioning, and scene understanding. The axis of symmetry plays an important role in the positioning and recognition of p...

Claims

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Application Information

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IPC IPC(8): G06T7/60
Inventor 胡静万秦琪蔡诗聂董帆高洪涛刘凡
Owner HUAZHONG UNIV OF SCI & TECH
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