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A restoration method and device for removing image distortion of an underwater detection target

A technology for underwater detection and target imaging, which is used in measurement devices, re-radiation of electromagnetic waves, radio wave measurement systems, etc., and can solve problems such as target imaging distortion in underwater detection target imaging systems.

Inactive Publication Date: 2014-10-08
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 the target image of the underwater detection target imaging system caused by water surface waves, and improve the scope of application of the system, the present invention proposes to use dual channels to simultaneously detect and record underwater detection targets and water surface waves A waveform reduction method and device for removing the distortion of underwater detection target imaging caused by water surface waves, through the reduction algorithm proposed by the present invention, the purpose of removing the imaging distortion of underwater detection target imaging system caused by water surface waves

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  • A restoration method and device for removing image distortion of an underwater detection target
  • A restoration method and device for removing image distortion of an underwater detection target
  • A restoration method and device for removing image distortion of an underwater detection 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 with 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 of the wave surface waveform of the water surface at this moment, h is the d...

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 get the point D of the waveless water surface .

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Abstract

The invention relates to the technical field of research on imaging systems for underwater detection targets, in particular to a restoration method and device for removing image distortion of underwater detection targets caused by waves on the water surface. The technical problem to be solved by the present invention is: in order to solve the problem of serious distortion of the target image of the underwater detection target imaging system caused by water surface waves, and improve the scope of application of the acquisition signal device, the present invention proposes to simultaneously detect and record the underwater detection target and water surface waves A method and device for restoring image distortion of an underwater detection target caused by wave removal from water surface waves. The restoration algorithm proposed by the present invention calculates the target point C through point A and B, and then calculates the imaging point E of point C on the image plane oxy when the target point C passes through the virtual wave-free water surface point D to remove the water surface. The purpose of imaging distortion caused by waves in the underwater detection target imaging system. The invention is applicable to the field of image reduction processing of underwater detection targets.

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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Patent Type & Authority Patents(China)
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