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Electrical equipment infrared image edge detection method based on Canny operator

An electrical equipment, infrared image technology, applied in image analysis, image enhancement, image data processing and other directions, can solve the problems of noise sensitivity, lack of edge information, etc., to achieve the effect of suppressing noise and solving the interference of complex backgrounds

Pending Publication Date: 2021-09-24
STATE GRID INFORMATION & TELECOMM GRP +2
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Problems solved by technology

Solve the problem that the edge detection of infrared images of electrical equipment in the prior art is sensitive to noise and prone to missing edge information

Method used

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  • Electrical equipment infrared image edge detection method based on Canny operator
  • Electrical equipment infrared image edge detection method based on Canny operator
  • Electrical equipment infrared image edge detection method based on Canny operator

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Embodiment Construction

[0065] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0066] The embodiment of the present invention provides a Canny operator-based infrared image edge detection method for electrical equipment, such as figure 1 As mentioned, the specific steps include:

[0067] Step 1: gray-scale post-processing of the infrared image of the electrical equipment to obtain a gray-scale image;

[0068] Step 2: Perform Gamma transformation on the obtained grayscale image to obtain an enhanced image, which specifically includes the following steps:

[0069] Step 21: Perform a normalization operation on the grayscale image to obtain the normalized image g(x,y);

[0070] Step 22: Perform Gamma transformation on the normalized image g(x,y) to obtain an enhanced image f(x,y):

[0071] f(x,y)=c·g λ (x,y) (1)

[0072] In the formula: x, y are space coordinates; c and λ are normal numbers;

[0073] Step 3: Smooth and denoise the enhanced image...

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Abstract

The invention provides an electrical equipment infrared image edge detection method based on a Canny operator, and the method comprises the steps: carrying out the graying processing of an electrical equipment infrared image, obtaining a gray image, carrying out the Gamma transformation of the gray image, obtaining an enhanced image, carrying out the smooth noise reduction of the enhanced image through a Gaussian filter, and obtaining a smooth image; on the basis of a traditional Canny algorithm, considering gradients in the four directions of 0 degree, 90 degrees, 45 degrees and 135 degrees, calculating the gradient magnitude and the gradient direction of each pixel in a smooth image, obtaining a gradient magnitude image, and then calculating double thresholds according to the gradient magnitude image obtained through calculation; carrying out non-maximum suppression on the gradient amplitude by adopting an interpolation mode; and finally, selecting and connecting edges according to the double thresholds. Compared with an existing method, the method is better in denoising effect, edge information can be detected more accurately, and the method is suitable for detection of the infrared image of the electrical equipment.

Description

technical field [0001] The present application relates to the field of image edge detection, in particular to a Canny operator-based infrared image edge detection method for electrical equipment. Background technique [0002] At present, infrared diagnostic technology has been widely used in the fault detection of electrical equipment. Edge detection, as one of the traditional methods of extracting the interesting part of the image, is an important step in the preprocessing of infrared images of electrical equipment. Due to the influence of some objective factors in practical applications, such as noise and environmental interference, it is difficult to extract accurate, continuous and closed edges from the part of interest in the infrared image, which will affect the identification of electrical equipment faults based on infrared images. make an impact. [0003] Edge detection of digital images can improve the efficiency of data processing. While retaining the important st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/13G06T5/00G06T7/136
CPCG06T7/13G06T7/136G06T2207/10048G06T5/70
Inventor 赵峰吴文炤许中平秦旭弘余金沄秦亮刘开培
Owner STATE GRID INFORMATION & TELECOMM GRP