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Edge detection method and device based on infrared image

An infrared image and edge detection technology, applied in the field of image processing, can solve the problems of non-adaptive ability, false edge, edge discontinuity, etc., and achieve the effect of improving image imaging effect, contrast and efficiency.

Pending Publication Date: 2022-03-04
CHINA ACAD OF SAFETY SCI & TECH +1
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Problems solved by technology

[0004] Among them, the threshold parameter of the operator needs to be set manually, and it has no self-adaptive ability. If the threshold is set too high, it will cause edge discontinuity, and if it is set too low, it will easily generate false edges.

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  • Edge detection method and device based on infrared image
  • Edge detection method and device based on infrared image
  • Edge detection method and device based on infrared image

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Embodiment Construction

[0058] The following is attached Figure 1-2 The application is described in further detail.

[0059] The embodiment of the present application discloses an edge detection method based on an infrared image, comprising the following steps:

[0060] Step S1: Convert the collected infrared image into a grayscale image. Each pixel in the grayscale image can be represented by a grayscale value of 0-255, and the pixel point in the image is expressed as g(x,y).

[0061] Step S2: Perform mean filtering on the converted grayscale image.

[0062] Specifically:

[0063]

[0064] In the formula, f(x, y) represents the gray value of the filtered image at the pixel point, step S is the set of the neighborhood where the pixel is located, M is the number of pixels in the set step S, and x and y are positive integers.

[0065] While receiving the infrared radiation of the measured target, the infrared image also receives a large amount of radiation information of non-detected objects, s...

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Abstract

The invention relates to the technical field of image processing, in particular to an edge detection method and device based on an infrared image, and the method comprises the steps: converting a collected infrared image into a grayscale image; carrying out mean filtering on the converted grayscale image; carrying out image enhancement by adopting gray linear transformation; determining an appropriate segmentation point a and an appropriate segmentation point b of the original image; compressing the total gray scale number; calculating a gradient amplitude based on a 2 * 2 neighborhood; calculating a gradient amplitude based on a 3 * 3 neighborhood; weighting the gradient amplitude calculated by the 2 * 2 neighborhood and the gradient amplitude calculated by the 3 * 3 neighborhood to obtain a gradient amplitude mean value; determining a threshold range; performing preliminary edge detection based on the high-threshold point; and carrying out refined edge detection based on the low threshold point. According to the invention, reasonable selection of the threshold value of the weak target of the infrared image is realized.

Description

technical field [0001] The present application relates to the technical field of image processing, in particular to an infrared image-based edge detection method and device. Background technique [0002] The infrared image is to use the infrared thermal imager to receive the infrared radiation from the target and the scene, and convert the invisible radiation into a visible image through photoelectric conversion. The light and dark (brightness) changes of each pixel of the image correspond to the radiation of the target and the scene Changes in energy intensity. Compared with visible light images, the contrast between the background and the target in infrared images is low, and the edges are blurred. [0003] Edge detection is a fundamental step in image processing, image analysis, pattern recognition, computer vision, and human vision. Edge detection is the process of locating edge pixels. By examining the gray level change of the point to be measured in a certain neighbor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/13G06T7/136G06T5/00
CPCG06T7/13G06T7/136G06T2207/10048G06T2207/20192G06T2207/20104G06T2207/20024G06T5/00
Inventor 王媛媛王如君多英全李兴华于立见陈秀梅郭乐乐张圣柱
Owner CHINA ACAD OF SAFETY SCI & TECH
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