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Underwater polarization imaging method and device

A polarization imaging and polarization angle technology, which is applied in the field of underwater polarization imaging methods and devices, and can solve problems such as loss of target information in reconstructed images.

Active Publication Date: 2021-02-19
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above traditional polarization imaging methods cannot completely restore the target information, resulting in the loss of target information in the reconstructed image

Method used

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  • Underwater polarization imaging method and device

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0041] See figure 1 with figure 2 , figure 1 It is a flow chart of an underwater polarization imaging method provided by an embodiment of the present invention, figure 2 It is an underwater polarization imaging provided by an embodiment of the present invention, which is an angle diagram between backscattered light, target reflected light and total light intensity. An underwater polarization imaging method provided by an embodiment of the present invention includes:

[0042] Step 1. The light source 1 emits a target beam, and the target beam irradiates the target 6 and the suspended particles 5 through the first polarizer 2 .

[0043] Specifically, the underwater polarization imaging method of the present invention is mainly used to study the change of polarization information of light beams after being scattered by water bodies, so as to solve the problems of limiting imaging distance and reducing image contrast in underwater optical imaging by backscattered light. In t...

Embodiment 2

[0089] On the basis of Example 1, please refer to figure 1 with figure 2 , figure 1 It is a flowchart of an underwater polarization imaging method provided by an embodiment of the present invention, figure 2 It is an underwater polarization imaging provided by an embodiment of the present invention, which is an angle diagram between backscattered light, target reflected light and total light intensity.

[0090] Obtain the target polarization angle according to the first total light intensity vector, the polarization degree of the backscattered light and the polarization angle of the backscattered light, including:

[0091] Step 7.1. Obtain the light intensity of the reflected light and the light intensity of the backscattered light of the target through a plurality of different hypothetical target polarization degrees and hypothetical target polarization angles.

[0092]Specifically, the mutual information indicates the degree of correlation between two pieces of informat...

Embodiment 3

[0122] On the basis of Example 1, please refer to figure 1 with figure 2 , figure 1 It is a flowchart of an underwater polarization imaging method provided by an embodiment of the present invention, figure 2 It is an underwater polarization imaging provided by an embodiment of the present invention, which is an angle diagram between backscattered light, target reflected light and total light intensity.

[0123] According to the degree of polarization of the backscattered light and the polarization angle of the backscattered light, the light intensity of the backscattered polarized light is obtained.

[0124] Step 8.1. In the target area, obtain the corresponding light intensity I when the polarization azimuth angles are 0°, 45°, 90° and 135° by rotating the second polarizer 0 , I 45 , I 90 and I 135 .

[0125] Light intensity I 0 , I 45 , I 90 and I 135 The expression is:

[0126]

[0127] Step 8.2, according to the polarization angle and light intensity I of ...

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Abstract

The invention discloses an underwater polarization imaging method and device. The underwater polarization imaging method comprises the steps that a target light beam emitted by a light source irradiates a target and suspended particles through a first polaroid; the target reflects the light beam to obtain target reflected light, and the suspended particles carries out the scattering of the light beam to obtain backward scattered light; the target reflected light and the back scattered light irradiate the detector through the second polaroid; in a target area, the second polaroid is rotated toobtain a first polarization subimage set, and then a first total light intensity vector is obtained; in the no-target area, a second polaroid is rotated to obtain a second polarization subimage set soas to obtain a second total light intensity vector; a polarization degree and a polarization angle of back scattering light are obtained according to the second total light intensity vector; a targetpolarization angle is obtained according to the first total light intensity vector, the polarization degree of the backscattered light and the polarization angle of the backscattered light; and the light intensity of the backscattered polarized light is obtained according to the polarization degree and the polarization angle of the backscattered light. According to the imaging method and device,lost target information in the image can be reconstructed, and the underwater imaging quality is improved.

Description

technical field [0001] The invention belongs to the field of optical imaging, and in particular relates to an underwater polarization imaging method and a device thereof. Background technique [0002] Underwater optical imaging has the advantages of high resolution, simple imaging equipment and rich information, and is widely used in mariculture, underwater archeology or mine detection and other fields. In underwater scenes, the main factor affecting the imaging quality is the scattered light generated by the scattering of light waves by water molecules and suspended particles in the water. Among them, part of the scattered light will propagate towards the direction of the detector to form backscattered light. The backscattered light will be superimposed on the target information light, which will reduce the contrast of the image acquired by the detector and affect the detection distance of underwater optical imaging. [0003] In order to solve the problem that the backscat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/89G01N21/21
CPCG01S17/89G01N21/21
Inventor 韩平丽卫毅邵晓鹏刘飞孙少杰范颖颖
Owner XIDIAN UNIV
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