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Restoring method and device for removing imaging distortion of underwater detected target

A technology for underwater detection and target imaging, which is applied in measuring devices, electromagnetic wave reradiation, radio wave measurement systems, etc., and can solve problems such as target imaging distortion in underwater detection target imaging systems

Inactive Publication Date: 2013-03-27
INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is: in order to solve the problem of serious distortion of target imaging in the underwater detection target imaging system caused by waves on the water surface, and improve the scope of application of the system, the present invention proposes A method and device for restoring the imaging distortion of the underwater detection target caused by the removal of the water surface waves by using dual channels to simultaneously detect and record the underwater detection target and the water surface wave waveform are realized. The purpose of imaging distortion of the target imaging system

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  • Restoring method and device for removing imaging distortion of underwater detected target
  • Restoring method and device for removing imaging distortion of underwater detected target
  • Restoring method and device for removing imaging distortion of underwater detected target

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Embodiment 1

[0105] Embodiment 1: A restoration method for removing imaging distortion of an underwater detection target includes

[0106] Step 1: According to the coordinates of any image point A actually imaged by the underwater detection target obtained by the xoy image plane of the image acquisition device, and the coordinates of the wave surface point B, it is known that the water depth of the underwater detection target is located on the z axis Therefore, the coordinates of the actual object point C of the underwater detection target corresponding to the actual imaging point A of the underwater detection target can be calculated, where the coordinates of the set point A , the coordinates of point B , point C coordinates , the wave water surface point B is the intersection point of the actual imaging point A of the underwater detection target through the imaging light AP formed by the signal receiving device and the wave water surface;

[0107] Step 2: From the coordinates of the...

Embodiment 2

[0108] Embodiment 2: On the basis of Embodiment 1, the actual object point C of the underwater detection target is calculated in the step 1 The specific process is:

[0109] Step 11: From the geometric relationship, it is easy to know that the equation of the straight line AB is:

[0110] (2)

[0111] Because the Z-axis coordinate of point B is z1=h+s, it can be calculated according to (1) , , Find the coordinates of point B ,in , combined with setting the immediate function of the wave surface as , get the normal of the wave surface at point B on the wave surface The equation is:

[0112] (4)

[0113] in , respectively at point B about and partial derivative of , , where the immediate function is the first optical receiving module to obtain the image of the underwater detection target, and the second optical receiving module to obtain the instantaneous function ...

Embodiment 3

[0125] Embodiment 3: On the basis of Embodiment 1 or 2, there is no wave surface point D in the above 2 The specific process is:

[0126] Step:21: From the CD equation is: (10)

[0127] Let the angle between CD and the normal of the calm water surface be ,but:

[0128] (11)

[0129] Step 22: Let the DE equation be:

[0130] (12)

[0131] Let the angle between DE and the normal of the calm water surface be ,but:

[0132] (13)

[0133] (14)

[0134] Since the three straight lines CD, DE, and the normal of the calm water surface are coplanar, we have:

[0135] (15)

[0136] From formula (11) ~ (15) can get , , to obtain the point D of the waveless water surface .

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Abstract

The invention relates to the technical field of researches on underwater detected target imaging systems, in particular to a restoring method and a device for removing underwater detected target imaging distortion caused by water surface waves and aims to widen the application range of a signal acquisition device and solve the technical problem of serious distortion of target imaging of the underwater detected target imaging systems due to water surface waves. The restoring method includes that a target point C is calculated in a backstepping mode through points A and B, an imaging point E of the C point on an image plane oxy at the time of a wave-free water surface is figured out through a virtual wave-free water surface point D by the target point C, and thereby the imaging distortion of the underwater detected target imaging systems due to the water surface waves can be removed. By means of the restoring method and the device, an underwater detected target and the water surface wave forms can be simultaneously detected and recorded, so that the imaging distortion of the underwater detected target due to the water surface waves can be removed. The restoring method and the device are applicable to restoring processing field of imaging of the underwater detected target.

Description

technical field [0001] The invention relates to the technical field of research on imaging systems for underwater detection and detection targets, in particular to a method and device for restoring imaging distortion of underwater detection and detection targets caused by removing waves on the water surface. Background technique [0002] Due to the refraction of light at the air-water interface, water surface waves will cause serious distortion of the imaging of underwater detection targets, seriously affecting the detection and identification of targets, and limiting the scope of application of the system. It is an urgent problem to be solved in the research of underwater detection target imaging systems. important problem. And because the wave waveform of the water surface is in a state of constant change, it brings great difficulties to the processing of the target image. Existing studies on the impact of waves on underwater detection target imaging are limited to the co...

Claims

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Application Information

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IPC IPC(8): G01S7/48G01S17/89
Inventor 钟森城王荣波李泽仁周维军田建华何莉华吴廷烈
Owner INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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