Neutral point identifying method based on polarization degree ellipse fitting

A technology of ellipse fitting and identification method, applied in the field of atmospheric optics research, which can solve the problems of unproposed neutral point detection and identification, etc.

Active Publication Date: 2014-02-05
HEFEI UNIV OF TECH
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Problems solved by technology

[0003] In the prior art, although the neutral point in the atmospheric polarization mode has been discussed and studied, how to detect and identify the neutral point has not been proposed

Method used

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  • Neutral point identifying method based on polarization degree ellipse fitting
  • Neutral point identifying method based on polarization degree ellipse fitting
  • Neutral point identifying method based on polarization degree ellipse fitting

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Embodiment Construction

[0049] In this example, if figure 1 As shown, a neutral point identification method based on degree of polarization ellipse fitting is carried out as follows:

[0050] Step 1: Obtain n sky polarization images I 1 , I 2 ,...,I n ;

[0051] The atmospheric polarization mode acquisition device is composed of a CCD camera, a fisheye lens and an analyzer placed in front of the fisheye lens; the CCD camera is used to acquire the polarized light intensity of the sky polarization image, and the fisheye lens replaces the lens of the CCD camera itself for The field of view of the CCD camera is extended, and the analyzer is used to detect atmospheric polarized light in sky polarized images.

[0052] Use the atmospheric polarization mode to acquire the device at n different polarization angles θ 1 ,θ 2 ,…,θ n Obtain n pieces of sky polarization images I respectively 1 , I 2 ,...,I n , n≥3; sky polarization images are represented in matrix form during calculation; in this impleme...

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Abstract

The invention discloses a neutral point identifying method based on polarization degree ellipse fitting. The neutral point identifying method is characterized by being performed as the following process:1, n sky polarization images are obtained; 2, an Otsu algorithm is used for extracting effective areas; 3, polarization degree images are calculated; 4, binarization processing is performed on the polarization degree images; 5, the areas where neutral points are located are searched for in the effective areas; 6, an ellipse fitting algorithm is used for performing fitting on the edges of the areas where the neutral points are located; 7, the neutral points are identified. The neutral point identifying method can effectively identify and demarcate the neutral points in the sky polarization images and therefore can provide neutral point characteristic information for atmospheric environment detection.

Description

technical field [0001] The invention relates to a neutral point identification method based on polarization degree ellipse fitting, which belongs to the field of atmospheric optics research. Background technique [0002] Sunlight itself is a natural light source, but it is scattered and reflected by particles in the atmosphere during atmospheric transmission, such as by O 2 and N 2 Molecules scatter and reflect, resulting in correspondingly polarized light. Sunlight with different polarization directions and different polarization intensities forms a specific atmospheric polarization mode. The neutral point is an important feature of the atmospheric polarization mode. The neutral point is a special position in the sky where the degree of polarization of atmospheric light is the lowest, and the polarization direction of atmospheric light will rotate by 90° when passing through this position along the solar meridian . The monitoring of the atmospheric environment can also ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06T7/00
Inventor 范之国王子谦金海红孙洁高隽
Owner HEFEI UNIV OF TECH
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