A Neutral Point Identification Method Based on Degree of Polarization Ellipse Fitting

A technology of ellipse fitting and identification method, which is applied in the field of atmospheric optics research, and can solve problems such as detection and identification of neutral points that have not been proposed

Active Publication Date: 2016-08-24
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

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  • A Neutral Point Identification Method Based on Degree of Polarization Ellipse Fitting
  • A Neutral Point Identification Method Based on Degree of Polarization Ellipse Fitting
  • A Neutral Point Identification Method Based on Degree of Polarization 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 the form of a matrix during the calculation pro...

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Abstract

The invention discloses a neutral point identification method based on polarization degree ellipse fitting, which is characterized in that it proceeds as follows: 1. Obtain n pieces of sky polarization images; 2. Use the Otsu algorithm to extract effective areas; 3. Calculate the degree of polarization Image, 4. Perform binarization processing on the polarization degree image, 5. Find the area where the neutral point is located in the effective area, 6. Use the ellipse fitting algorithm to fit the edge of the area where the neutral point is located, 7. Identifying sexual point. The invention can effectively identify and calibrate the neutral point in the sky polarization image, so as to provide characteristic information of the neutral point 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 Patents(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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