Underwater video detection method and device

Abstract

The present application discloses an underwater video detection method and device, which relates to the technical field related to underwater detection. The underwater video detection method includes constructing a local dry area on the periphery of the target area; collecting images of the target area through the local dry area to obtain a target image; and analyzing the image features in the target image to determine whether there are defects in the target area. The method ensures that the imaging optical path of the target image is not affected by the water layer by constructing a local dry area on the periphery of the target area and collecting images of the target area through the local dry area. When liquid is stored in the pool, the clarity and detection accuracy of the target image are improved, and tiny defects can be effectively discovered.

Description

Technical Field

[0001] The present application relates to the technical field related to underwater detection, and in particular to an underwater video detection method and device. Background Art

[0002] In the industrial field, metal structure pools used to store liquids have been in service for a long time in complex working conditions and environments. The inner wall of the pool is at risk of cracking, pitting and stress corrosion cracking, which reduces the load-bearing capacity of the pool and may even cause serious consequences such as pool rupture and liquid leakage. Therefore, underwater video detection equipment is needed to detect defects at the stage of their occurrence and repair them in a timely manner.

[0003] Usually, the size of defects in the initiation stage is relatively small, and conventional visual and video inspections are only equivalent to manual visual inspections, which are difficult to effectively discover and measure. In addition, for the inspection of the inner wall of the pool, the traditional method is usually to empty the liquid and implement it in a completely dry environment. However, the liquid stored in some pools has special properties and cannot be directly emptied or transferred, which is economically costly.

[0004] Therefore, how to improve the detection accuracy in the liquid storage state to effectively discover tiny defects has become an urgent problem to be solved in this field. Summary of the invention

[0005] The purpose of the present application is to provide an underwater video detection method, which can improve the problems of low detection accuracy and difficulty in effectively discovering tiny defects in existing underwater video detection methods when liquid is stored in a pool.

[0006] Another object of the present application is to provide an underwater video detection device.

[0007] In a first aspect, an embodiment of the present application provides an underwater video detection method, which includes:

[0008] Construct local dry areas around the target area;

[0009] The target area is imaged through the local dry area to obtain a target image;

[0010] Analyze the image features in the target image to determine whether there are defects in the target area.

[0011] In the above implementation process, a local dry area is constructed on the periphery of the target area, and images of the target area are collected through the local dry area to ensure that the imaging light path of the target image is not affected by the water layer. In the case of liquid in the pool, the clarity and detection accuracy of the target image are improved, and tiny defects can be effectively discovered.

[0012] In a possible implementation, the method for constructing the local dry area includes:

[0013] Determine a preselected area outside the target area;

[0014] Gas of a predetermined pressure is introduced into the preselected area to move water in the preselected area to outside the preselected area, and the preselected area constitutes a local dry area.

[0015] In the above implementation process, the local dry area is a dynamic local dry area, and the pre-selected area is separated from the target area by a preset distance. During the movement, the image can still be collected through the local dry area. On the basis of ensuring the clarity of image collection, the efficiency of image collection is improved, and tiny defects in the target area can be quickly and effectively discovered.

[0016] In a possible implementation scheme, the pressure of the gas introduced into the local dry area is adjusted so that the pressure in the local dry area is kept in dynamic balance with the pressure outside the local dry area.

[0017] In a possible implementation manner, after a gas of a predetermined pressure is introduced into a preselected area to form a local dry area and before an image of a target area is acquired through the local dry area, the method further includes:

[0018] Initial screening image acquisition of the target area through the local dry area;

[0019] When it is determined that the primary screening image has defect features with a predetermined resolution, the local dry area is moved and a closed cavity is formed between the local dry area and the target area.

[0020] In the above implementation process, first, the defects of the target area are preliminarily screened through the dynamic local dry area. When the target image has defect characteristics, the local dry area and the target area form a closed cavity, that is, a static local dry area; then, the image is collected through the static local dry area to further improve the clarity and detection accuracy of the target image.

[0021] In a possible implementation, the method for constructing a local dry area includes:

[0022] Determine a preselected area outside the target area;

[0023] A gas of a predetermined pressure is introduced into the preselected area to move the water in the preselected area to outside the preselected area;

[0024] The distance between the preselected area and the target area is adjusted so that the preselected area and the target area form a closed cavity, and the preselected area constitutes a local dry area.

[0025] In the above implementation process, the local dry area is a static local dry area. In a static state, images can be collected through the local dry area to improve the clarity and detection accuracy of the target image, and tiny defects in the target area can be effectively discovered.

[0026] On the other hand, an embodiment of the present application provides an underwater video detection device, comprising:

[0027] A drainage unit is used to construct a local dry area on the periphery of the target area; there is a predetermined interval between the local dry area and the target area;

[0028] The imaging unit is used to collect an image of a target area through a local dry area.

[0029] In the above implementation process, the drainage unit can construct a local dry area on the periphery of the target area, and the imaging unit captures images of the target area through the local dry area, ensuring that there is no water layer interval in the imaging light path of the imaging unit, and the light path is not affected by the water layer. When liquid is stored in the pool, the clarity and detection accuracy of the target image are improved, and tiny defects can be effectively discovered.

[0030] In one possible embodiment, the drainage unit comprises:

[0031] A mask body with an inner cavity structure, the mask body is a flat structure that is concave inwards, and the opening of the mask body faces the target area and has a predetermined interval between the opening and the target area;

[0032] When the cover body is located underwater, gas of a predetermined pressure is introduced into a virtual cavity formed by the cover body and the target area, and the virtual cavity filled with gas constitutes a local dry area.

[0033] In a possible implementation manner, a light-transmitting mirror is provided inside the cover body.

[0034] In a possible implementation, the light path of the imaging unit is perpendicular to the target area.

[0035] In a possible implementation, the optical path of the imaging unit is L-shaped; a reflector is disposed at the bend of the optical path of the imaging unit.

[0036] In the above implementation process, the optical path of the imaging unit and the target area are L-shaped, that is, the underwater video detection device is placed horizontally in the pool, the imaging unit is parallel to the target area, and the drainage unit is perpendicular to the target area, which can effectively reduce the resistance of water to the device during movement.

[0037] In a possible implementation, the incident angle between the incident ray of the imaging unit and the reflector is adjustable.

[0038] In the above implementation process, it is ensured that the imaging unit can capture images of the target area from multiple angles.

[0039] In a possible embodiment, the drainage unit is further configured with a guide and anti-collision component.

[0040] In one possible implementation, the imaging unit includes:

[0041] A first camera module;

[0042] The second camera module has a low-magnification magnification imaging function;

[0043] The third camera module has a high-magnification imaging function.

[0044] Compared with the prior art, the present invention has the following advantages:

[0045] 1) This method constructs a local dry area on the periphery of the target area and collects images of the target area through the local dry area, thereby ensuring that the imaging light path of the target image is not affected by the water layer. When liquid is stored in the pool, the clarity and detection accuracy of the target image are improved, and tiny defects can be effectively discovered.

[0046] 2) This method can capture target images in both dynamic local dry areas and static local dry areas, and can capture images of target areas with poor underwater visibility to achieve detection of target areas.

[0047] 3) In the device, the drainage unit can construct a local dry area on the periphery of the target area, ensuring that there is no water layer in the imaging light path of the imaging unit, and the light path is not affected by the water layer. When liquid is stored in the pool, the clarity and detection accuracy of the target image are improved, and tiny defects can be effectively discovered.

[0048] 4) In the device, the optical path of the imaging unit and the target area are L-shaped, and a reflector is provided at the bend of the optical path of the imaging unit. The incident angle between the incident ray of the imaging unit and the reflector is adjustable, ensuring that the imaging unit can capture images of the target area from multiple angles. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0050] Figure 1 A schematic diagram of an underwater video detection method according to an embodiment of the present application

[0051] Figure 2 It is a structural schematic diagram of an underwater video detection device according to an embodiment of the present application;

[0052] Figure 3 It is a structural schematic diagram of an underwater video detection device according to an embodiment of the present application;

[0053] Figure 4 for Figure 2 A schematic diagram of a working state of the underwater video detection device shown;

[0054] Figure 5 for Figure 2 A schematic diagram of a working state of the underwater video detection device shown;

[0055] Figure 6 for Figure 5 A partial enlarged view of the underwater video detection device in working state;

[0056] Figure 7 for Figure 2 A schematic diagram of a working state of the underwater video detection device shown.

[0057] Illustration Description:

[0058] 100 imaging unit; 110 first camera module; 120 second camera module; 130 third camera module; 200 adjusting mechanism; 210 first adjusting mechanism; 220 second adjusting mechanism; 230 third adjusting mechanism; 300 drainage unit; 310 cover body; 311 air inlet; 312 air outlet; 320 light-transmitting mirror; 330 guiding and anti-collision assembly; 340 sealing assembly; 400 protective cover; 500 pool; 510 defect; 600 reflector. DETAILED DESCRIPTION

[0059] The technical solutions of the specific implementation methods of the present application are further described in detail below in conjunction with the accompanying drawings. These implementation methods are only used to illustrate the present application, but not to limit the present application.

[0060] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0061] In the description of the present application, it should be noted that the terms “first” and “second” etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0062] According to one aspect of the present application, an underwater video detection method is provided. Figure 1 , underwater video detection methods include:

[0063] S1. Construct a local dry area outside the target area;

[0064] S2, collecting images of the target area through the local dry area to obtain a target image;

[0065] S3. Analyze the image features in the target image to determine whether there are defects in the target area.

[0066] Specifically, the target area in this embodiment is the inner wall of the pool.

[0067] The working process and working principle of this application:

[0068] When defect detection is performed on the inner wall of a pool with liquid in it, the water will affect the clarity of the target image and the detection accuracy. This is mainly due to the low transparency of the water and the presence of tiny inorganic and organic particles in the water. These particles will scatter the light collected by the image, thereby affecting the clarity of the target image and making it impossible to effectively detect tiny defects.

[0069] In the case of liquid stored in the pool, the method of the present application constructs a local dry area on the periphery of the target area, and captures images of the target area through the local dry area, thereby ensuring that the imaging light path of the target image is not affected by the water layer. In the case of liquid stored in the pool, the clarity and detection accuracy of the target image are improved, and tiny defects can be effectively discovered.

[0070] In one embodiment, in step S1, the method for constructing a local dry area includes:

[0071] Determine a preselected area outside the target area;

[0072] Gas of a predetermined pressure is introduced into the preselected area to move water in the preselected area to outside the preselected area, and the preselected area constitutes a local dry area.

[0073] Specifically, the local dry area in the present embodiment is a dynamic local dry area, the pre-selected area is separated from the target area by a preset distance, and a gap is left between the pre-selected area and the target area, and the distance between the pre-selected area and the target area is between 0 and 10 mm. In the process of moving the image acquisition of the target area, the image can still be acquired through the local dry area, and the target area is dynamically scanned on the basis of ensuring the clarity of the image acquisition, thereby improving the efficiency of image acquisition and being able to quickly and effectively discover tiny defects in the target area.

[0074] Preferably, the pressure of the gas in the local dry area is adjusted so that the pressure in the local dry area is kept in dynamic balance with the pressure outside the local dry area. During the moving process of collecting images of the target area, the local dry area is always kept free of water.

[0075] In one embodiment, in step S1, after a gas of a predetermined pressure is introduced into the preselected area to form a local dry area and before an image of the target area is acquired through the local dry area, the method further includes:

[0076] Initial screening image acquisition of the target area through the local dry area;

[0077] When it is determined that the primary screening image has defect features with a predetermined resolution, the local dry area is moved and a closed cavity is formed between the local dry area and the target area.

[0078] Specifically, the present embodiment firstly collects images of the target area through the local dry area in a dynamic state. If the collected target image shows that there is a defect in the target area, the distance between the preselected area and the target area is adjusted so that the preselected area and the target area form a closed cavity, and the local dry area constitutes a static local dry area. Then, in a static state, the image is collected through the static local dry area to further improve the clarity of the target image and the detection accuracy.

[0079] In one embodiment, in step S1, the method for constructing a local dry area includes:

[0080] Determine a preselected area outside the target area;

[0081] A gas of a predetermined pressure is introduced into the preselected area to move the water in the preselected area to outside the preselected area;

[0082] The distance between the preselected area and the target area is adjusted so that the preselected area and the target area form a closed cavity, and the preselected area constitutes a local dry area.

[0083] Specifically, the local dry area in this embodiment is a static local dry area. The preselected area and the target area form a closed cavity. In a static state, images can be collected through the local dry area to improve the clarity and detection accuracy of the target image, and tiny defects in the target area can be effectively discovered.

[0084] According to another aspect of the present application, an underwater video detection device is provided. Figure 2 The underwater video detection device includes an imaging unit 100 and a drainage unit 300. The drainage unit 300 is used to construct a local dry area around the target area; there is a predetermined interval between the local dry area and the target area. The imaging unit 100 is used to collect an image of the target area through the local dry area.

[0085] Specifically, the target area in this embodiment is the inner wall of the pool 500 .

[0086] The working process and working principle of this application:

[0087] The drainage unit 300 and the imaging unit 100 in the underwater video detection device detect the target area using the underwater video detection method described above to detect whether the target area has defects. The drainage unit 300 can construct a local dry area outside the target area, and the imaging unit 100 captures images of the target area through the local dry area, ensuring that the imaging optical path of the imaging unit 100 is free of water layers, and the optical path is not affected by the water layer. When the pool 500 contains liquid, the clarity and detection accuracy of the target image are improved, and the tiny defects 510 can be effectively found.

[0088] In one embodiment, the interval between the local dry area and the target area is zero, at which point a closed cavity is formed between the local dry area and the target area, and the local dry area is a static local dry area, which is used for static imaging unit 100 to collect images of the target area. The interval between the local dry area and the target area ranges from 0 to 10 mm, and a gap is left between the local dry area and the target area, and the local dry area is a dynamic dry area, which is used for dynamic imaging unit 100 to collect images of the target area.

[0089] In one embodiment, see Figure 2, the drainage unit 300 includes a cover body 310 with an inner cavity structure. The cover body 310 is a flat structure that is recessed inward, and the opening of the cover body 310 faces the target area and has a predetermined interval with the target area. The cover body 310 is configured with a virtual cavity for forming a local dry area on the periphery of the target area. Preferably, the longitudinal section of the virtual cavity is an isosceles trapezoidal shape. The cover body 310 is provided with a plurality of evenly distributed air inlets 311 and air outlets 312. When the cover body 310 is located underwater, gas of a predetermined pressure is introduced into the interior of the cover body 310 and the virtual cavity through the air inlet 311 through the air inlet pipeline, so that the water inside the cover body 310 and the virtual cavity moves to the outside of the cover body 310, and the virtual cavity filled with gas constitutes a local dry area.

[0090] Preferably, the pressure of the gas in the local dry area is adjusted so that the pressure in the local dry area is kept in dynamic balance with the pressure outside the local dry area.

[0091] Preferably, the cover body 310 is made of a metal material or a non-metal material with rigidity to ensure that the cover body 310 can withstand a certain pressure underwater without being damaged.

[0092] It should be noted that the structure of the cover body 310 and the virtual cavity configured by the cover body 310 on the periphery of the target area is only exemplary. The present application does not specifically limit the structure of the cover body 310 and the virtual cavity configured by the cover body 310 on the periphery of the target area. Any structure that can form a local dry area between the target area and the drainage unit 300 falls within the protection scope of the present application.

[0093] In one embodiment, the drainage unit 300 further includes a light-transmitting mirror 320. The light-transmitting mirror 320 is disposed inside the housing 310 and disposed on the optical path of the imaging unit 100. The light-transmitting mirror 320 includes a surface having a hydrophobic coating, and under the purge effect of the gas in the housing 310, the surface of the light-transmitting mirror 320 can dry quickly, so as to facilitate clear display of the target area.

[0094] In one embodiment, see Figure 2 The drainage unit 300 further includes a sealing component 340 and a guide and anti-collision component 330. The guide and anti-collision component 330 is arranged on both sides of the drainage unit 300 in the direction of travel.

[0095] In one embodiment, see Figure 2 , the optical path of the imaging unit 100 is perpendicular to the target area. The imaging unit 100, the drainage unit 300 and the target area are all on the same straight line. When the underwater video detection device is used to collect images of the target area, the underwater video detection device is vertically placed above the target area.

[0096] In one embodiment, see Figure 3, the optical path of the imaging unit 100 is L-shaped; a reflector 600 is provided at the bend of the optical path of the imaging unit 100. When the underwater video detection device is used to collect images of a target area, the underwater video detection device is placed horizontally above the target area, that is, the imaging unit 100 is parallel to the target area, and the drainage unit 300 is perpendicular to the target area, which can effectively reduce the resistance of water to the device during movement.

[0097] Preferably, the incident angle between the incident ray of the imaging unit 100 and the reflector 600 is adjustable, so as to ensure that the imaging unit 100 can capture images of the target area from multiple angles. Specifically, the reflector 600 is connected to the output shaft of the driving motor, and the driving motor drives the reflector 600 to rotate to adjust the incident angle between the incident ray of the imaging unit 100 and the reflector 600.

[0098] In one embodiment, see Figure 2-3 The underwater video detection device further includes a protective cover 400, an imaging unit 100 is arranged inside the protective cover 400, and a drainage unit 300 is connected to the opening of the protective cover 400. The protective cover 400 and the drainage unit 300 form a watertight compartment. When the device is in a working state, after a preset pressure of gas is passed into the drainage unit 300, the inside of the protective cover 400 is in a slightly positive pressure state, and the imaging unit 100 inside the protective cover 400 is double waterproof.

[0099] In one embodiment, see Figure 2-3 The imaging unit 100 includes a first camera module 110, a second camera module 120 and a third camera module 130. The imaging unit 100 selects an adaptive camera module according to the change of the water environment of the target area and the image acquisition requirements.

[0100] The first camera module 110 includes a high-speed camera module, which is mainly used to collect images of a large target area. It is less affected by water fluctuations in a water environment and can obtain clear target images.

[0101] The second camera module 120 has a low magnification imaging function, and is specifically a zoom magnification camera module, whose zoom lens is driven by an electric motor and has a low magnification function, which is conducive to obtaining the details of the target area and improving the detection accuracy of the target area.

[0102] The third camera module 130 has a high magnification imaging function, specifically, a super-depth microscopic imaging module, which has a large focal length and performs microscopic imaging of the target area at a relatively large distance from the target area, thereby avoiding interference between the lens and the drainage unit 300.

[0103] Preferably, the first camera module 110 , the second camera module 120 and the third camera module 130 are all equipped with independent lighting lamps to ensure that the first camera module 110 , the second camera module 120 and the third camera module 130 have sufficient exposure and can effectively obtain clear target images.

[0104] Preferably, the second camera module 120 is provided with an anti-shake function to ensure that the second camera module 120 is still in a stable state in a moving state and can capture images of the target area.

[0105] It should be noted that the number of camera modules included in the imaging unit 100 and the types of the first camera module 110, the second camera module 120, and the third camera module 130 are merely exemplary. The present application does not specifically limit the number of camera modules included in the imaging unit 100 and the specific types of the first camera module 110, the second camera module 120, and the third camera module 130. Any number and type that can capture the image of the target area and obtain a clear target image falls within the protection scope of the present application.

[0106] In one embodiment, see Figure 2-3 The underwater video detection device further includes an adjustment mechanism 200 for adjusting the position of the imaging unit 100 to adjust the detection range, focal length and clarity of the imaging unit 100 .

[0107] Specifically, the adjustment mechanism 200 includes a first adjustment mechanism 210, a second adjustment mechanism 220 and a third adjustment mechanism 230. The first adjustment mechanism 210 is used to drive the imaging unit 100 to move horizontally in the horizontal plane, so as to expand the detection range. The second adjustment mechanism 220 is used to drive the imaging unit 100 to move longitudinally in the horizontal plane, so as to expand the detection range. The third adjustment mechanism is used to adjust the focal length and clarity of the imaging unit 100. The first adjustment mechanism 210, the second adjustment mechanism 220 and the third adjustment mechanism 230 all have a fine-tuning function.

[0108] In one implementation, the underwater video detection device is further configured with a control device, and the control device is communicatively connected with the imaging unit 100 , the adjustment mechanism 200 and the drainage unit 300 .

[0109] The working process of the underwater video detection device in this embodiment when detecting the target area is as follows:

[0110] 1. Normal mode

[0111] See also Figure 4, the first camera module 110 in the imaging unit 100 is used to directly observe and quickly search the target area through the water environment. At this time, the position of the first camera module 110 is adjusted so that the first camera module 110 has a suitable detection range.

[0112] 2. Dynamic local dry mode

[0113] See also Figure 5 and Figure 6 In the conventional mode, after locating the target area, the position of the drainage unit 300 is adjusted so that the drainage unit 300 is separated from the target area by a preset distance, a gap is left between the drainage unit 300 and the target area, and the drainage unit 300 is used to construct a dynamic local dry area around the target area. After the transmission mirror 320 in the drainage unit 300 is dried, the first adjustment mechanism 210 and the second adjustment mechanism 220 are adjusted so that the second camera module 120 is located on the center line of the drainage unit 300, the third adjustment mechanism 230 and the second camera module 120 are adjusted, the required magnification is set, and a clear target image is obtained. The resolution of the target image is low. The image features of the target image are judged to determine whether the target area has defects 510. At this time, the device can collect images of the target area during movement, and the imaging optical path is always in a water-free state; the image of the target area can also be obtained in a turbid water environment or a water environment with poor visibility.

[0114] 3. Static local dry mode

[0115] See also Figure 7 In the dynamic local dry mode, after determining that there is a defect 510 in the target area, keep the device in a stationary state, increase the pressure of the gas in the local dry area, so as to enhance the drainage function of the local dry area. Adjust the distance between the drainage unit 300 and the target area so that the drainage unit 300 contacts the target area to form a closed cavity. Then, open the air outlet 312 of the cover body 300, and let hot gas in from the air inlet 311 to completely dry the target area, reduce the gas pressure, and maintain a slightly positive pressure in the internal cavity of the cover body 310. When the third camera module 130 is at a lower magnification, adjust its position to locate the defect 510 in the target area. When the third camera module 130 is at a larger magnification, capture an image of the defect 510 to obtain a high-resolution target image.

[0116] In this mode, after the detection of the tiny defects 510, the pressure of the gas in the local dry area is increased, and the distance between the drainage unit 300 and the target area is adjusted so that the drainage unit 300 and the target area maintain a preset distance, and a gap is left between the drainage unit 300 and the target area, so that the gas is discharged from the gap between the bottom edge of the cover body 310 and the target area, and a dynamic dry environment is re-formed. The device is continuously moved and the above detection steps are repeated.

[0117] The device can be used in conjunction with underwater robots, tracked vehicles, floaters and other equipment.

[0118] Beneficial effects of this application:

[0119] 1) The method in the present application constructs a local dry area on the periphery of the target area, and captures images of the target area through the local dry area, thereby ensuring that the imaging light path of the target image is not affected by the water layer. When liquid is stored in the pool, the clarity and detection accuracy of the target image are improved, and tiny defects can be effectively discovered.

[0120] 2) The method in the present application can capture target images in both dynamic local dry areas and static local dry areas, and can capture images of target areas with poor underwater visibility to achieve detection of the target area.

[0121] 3) In the device of the present application, the drainage unit 300 can construct a local dry area on the periphery of the target area, ensuring that there is no water layer in the imaging light path of the imaging unit 100, and the light path is not affected by the water layer. When liquid is stored in the water pool 500, the clarity and detection accuracy of the target image are improved, and tiny defects 510 can be effectively discovered.

[0122] 4) In the device of the present application, the optical path of the imaging unit 100 is L-shaped, and a reflector 600 is provided at the bend of the optical path of the imaging unit 100. The incident angle between the incident ray of the imaging unit 100 and the reflector 600 is adjustable, thereby ensuring that the imaging unit 100 can capture images of the target area from multiple angles.

[0123] 5) In the device of the present application, the imaging unit 100 selects an appropriate camera module according to the changes in the water environment of the target area and the image acquisition requirements, thereby effectively ensuring the quality of the target image.

[0124] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present application. These improvements and substitutions should also be regarded as the scope of protection of the present application.

Claims

1. An underwater video detection method, characterized in that: include: Construct local dry areas around the target area; Capturing an image of the target area through the local dry area to obtain a target image; Analyzing image features in the target image to determine whether there is a defect in the target area; The method for constructing the local dry area comprises: A preselected area is determined at the periphery of the target area, the preselected area is separated from the target area by a preset distance, the interval between the preselected area and the target area ranges from 0 to 10 mm, a gas of a predetermined pressure is introduced into the preselected area, so that the water in the preselected area moves to the outside of the preselected area, the preselected area constitutes the local dry area, and the local dry area is a dynamic local dry area; Adjusting the distance between the preselected area and the target area so that the preselected area and the target area form a closed cavity, the preselected area constitutes the local dry area, and the local dry area is a static local dry area; Using an imaging unit to observe and quickly search the target area over a large area through the water environment; In the conventional mode, after locating the target area, adjusting the position of the drainage unit so that the drainage unit is separated from the target area by a preset distance, leaving a gap between the drainage unit and the target area, and using the drainage unit to construct the dynamic local dry area at the periphery of the target area; After determining that the target area has a defect in the dynamic local dry mode, adjusting the distance between the drainage unit and the target area so that the drainage unit contacts the target area to form the closed cavity; The target area is the inner wall of the pool.

2. The underwater video detection method according to claim 1, characterized in that: The pressure of the gas introduced into the local dry area is adjusted so that the pressure of the local dry area is kept in dynamic balance with the pressure outside the local dry area.

3. The underwater video detection method according to claim 1 or 2, characterized in that: After the gas of predetermined pressure is introduced into the preselected area to form the local dry area and before the image of the target area is collected through the local dry area, the method further includes: Acquiring a preliminary screening image of the target area through the local dry area; When it is determined that the primary screening image has defect features with a predetermined resolution, the local dry area is moved to form the closed cavity with the target area.

4. An underwater video detection device, used to implement the underwater video detection method according to claim 1, characterized in that: include: Drainage cells, used to create localized dry areas around the periphery of the target area; There is a predetermined interval between the local dry area and the target area; An imaging unit, used for collecting an image of the target area through the local dry area; The drainage unit comprises a cover body with an inner cavity structure, the cover body is a flat structure concave inwards, and a light-transmitting mirror is arranged inside the cover body; The light-transmitting mirror comprises a surface having a hydrophobic coating; The cover body is provided with a plurality of evenly distributed air inlets and air outlets; The opening of the cover body faces the target area and has a predetermined interval between the target area; When the cover is underwater, gas of a predetermined pressure is introduced into a virtual cavity formed by the cover and the target area, and the virtual cavity filled with the gas constitutes the local dry area; The optical path of the imaging unit is L-shaped; a reflector is provided at the bend of the optical path of the imaging unit, the reflector is connected to the output shaft of the driving motor, and the driving motor drives the reflector to rotate; The incident angle between the incident ray of the imaging unit and the reflector is adjustable; The imaging device comprises an adjusting mechanism, wherein the adjusting mechanism comprises a first adjusting mechanism, a second adjusting mechanism and a third adjusting mechanism, wherein the first adjusting mechanism is used to drive the imaging unit to move in a horizontal direction in a horizontal plane, the second adjusting mechanism is used to drive the imaging unit to move in a longitudinal direction in a horizontal plane, and the third adjusting mechanism is used to adjust the focal length and clarity of the imaging unit; The target area is the inner wall of the pool.

5. The underwater video detection device according to claim 4, characterized in that: The optical path of the imaging unit is perpendicular to the target area.

6. The underwater video detection device according to claim 4 or 5, characterized in that: The drainage unit is also provided with a guide and anti-collision component.

7. The underwater video detection device according to claim 6, characterized in that: The imaging unit comprises: A first camera module; The second camera module has a low-magnification magnification imaging function; The third camera module has a high-magnification imaging function.

Images