CN114187500A - Underwater video detection method and device - Google Patents
Underwater video detection method and device Download PDFInfo
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Abstract
The application discloses an underwater video detection method and device, and relates to the related technical field of underwater detection, wherein the underwater video detection method comprises the steps of constructing a local dry-type area at the periphery of a target area; acquiring an image of the target area through the local dry area to obtain a target image; and analyzing the image characteristics in the target image to determine whether the target area has defects. According to the method, the local dry-type area is constructed on the periphery of the target area, and the image acquisition is carried out on the target area through the local dry-type area, so that the imaging light path of the target image is not affected by a water layer, the definition and the detection precision of the target image are improved under the condition that the liquid is stored in the water pool, and the micro defects can be effectively found.
Description
Technical Field
The application relates to the technical field of underwater detection, in particular to an underwater video detection method and device.
Background
In the industrial field, the metal structure water pool for storing liquid is used in complex working conditions and environments for a long time, the inner wall of the water pool has risks of cracking, pitting corrosion, stress corrosion cracking and the like, the bearing capacity of the water pool is reduced, and even serious consequences such as water pool cracking, liquid leakage and the like can be caused. Therefore, the defect is detected by using an underwater video detection device at the stage of defect initiation, and is maintained in time.
Typically the defect size at the initiation stage is relatively small and conventional visual and video inspection is only equivalent to manual visual inspection and is difficult to find and measure effectively. In addition, for inspection of the interior walls of the basin, conventional methods typically employ emptying the liquid, which is performed in a completely dry environment. However, some tanks have special properties of stored liquids, which cannot be directly emptied or dumped, and are economically very expensive.
Therefore, how to improve the detection accuracy in the liquid-storing state to effectively detect the micro-defects is a problem that needs to be solved in the field.
Disclosure of Invention
The application aims to provide an underwater video detection method which can solve the problems that an existing underwater video detection method is low in detection precision and difficult to effectively find micro defects in a liquid storage state of a water pool.
Another object of the present application is to provide an underwater video detection device.
In a first aspect, an embodiment of the present application provides an underwater video detection method, which includes:
constructing a local dry area at the periphery of the target area;
acquiring an image of the target area through the local dry area to obtain a target image;
and analyzing the image characteristics in the target image to determine whether the target area has defects.
In the implementation process, the local dry-type area is constructed at the periphery of the target area, and the image acquisition is carried out on the target area through the local dry-type area, so that the imaging light path of the target image is not influenced by a water layer, the definition and the detection precision of the target image are improved under the condition that the liquid is stored in the water pool, and the micro defects can be effectively found.
In a possible embodiment, the method for constructing the local dry region includes:
determining a preselected area at the periphery of the target area;
and introducing gas with preset pressure into the preselected area to move water in the preselected area to the outside of the preselected area, wherein the preselected area forms a local dry area.
In the implementation process, the local dry area is a dynamic local dry area, the preselection area is separated from the target area by a preset distance, and the image can still be acquired through the local dry area in the moving process, so that the image acquisition efficiency is improved on the basis of ensuring the image acquisition definition, and the micro defects of the target area can be quickly and effectively found.
In one possible embodiment, the pressure of the gas passing into the localized dry zone is adjusted to dynamically balance the pressure in the localized dry zone with the pressure outside the localized dry zone.
In a possible embodiment, after the gas with the preset pressure is introduced into the preselected area to form the local dry area, and before the image acquisition of the target area is carried out through the local dry area, the method further comprises the following steps:
carrying out primary screening image acquisition on a target area through a local dry area;
and when the primary screening image is determined to have the defect characteristics with the preset resolution, moving the local dry area and enabling the local dry area and the target area to form a closed cavity.
In the implementation process, firstly, the defects of the target area are screened primarily through the dynamic local dry area, and when the target image has the defect characteristics, the local dry area and the target area form a closed cavity, namely a static local dry area; then, the image is collected through the static local dry area, and the definition and the detection precision of the target image are further improved.
In one possible embodiment, the method for constructing the local dry region comprises:
determining a preselected area at the periphery of the target area;
introducing gas with preset pressure into the preselected area to move water in the preselected area to the outside of the preselected area;
and adjusting the distance between the preselected area and the target area to form a closed cavity between the preselected area and the target area, wherein the preselected area forms a local dry area.
In the implementation process, the local dry area is a static local dry area, and in a static state, the image can be acquired through the local dry area, so that the definition and the detection precision of the target image are improved, and the micro defects of the target area can be effectively found.
On the other hand, this application embodiment provides an underwater video detection device, and it includes:
a drainage unit for constructing a local dry region at the periphery of the target region; the local dry area and the target area have a preset interval;
and the imaging unit is used for acquiring the image of the target area through the local dry area.
In the implementation process, the drainage unit can construct a local dry area at the periphery of the target area, the imaging unit collects images of the target area through the local dry area, the interval of an imaging light path of the imaging unit without a water layer is guaranteed, the light path is not affected by the water layer, under the condition that the pool stores liquid, the definition and the detection precision of the target image are improved, and the micro defects can be effectively found.
In one possible embodiment, the drainage cell comprises:
the mask body is of an inwards-concave flat structure, and an opening of the mask body faces a target area and has a preset interval with the target area;
when the cover body is positioned underwater, gas with preset pressure is introduced into a virtual cavity formed by the cover body and the target area, and the virtual cavity filled with the gas forms a local dry area.
In a possible embodiment, the interior of the housing is provided with a light-transmitting mirror.
In a possible embodiment, the optical path of the imaging unit is perpendicular to the target area.
In one possible embodiment, the optical path of the imaging unit is L-shaped; and a reflector is arranged at the bending part of the optical path of the imaging unit.
In the implementation process, the light path of the imaging unit and the target area are L-shaped, namely the underwater video detection device is transversely placed in a water pool, the imaging unit is parallel to the target area, and the drainage unit is perpendicular to the target area, so that the resistance of water to the device in the moving process can be effectively reduced.
In a possible embodiment, the incident angle of the imaging unit and the incident angle of the mirror are adjustable.
In the implementation process, the imaging unit is ensured to be capable of acquiring images of the target area from a plurality of angles.
In a possible embodiment, the drainage unit is also provided with a guiding and crash-proof assembly.
In one possible embodiment, an imaging unit comprises:
a first camera module;
the second camera module has a low-magnification amplification imaging function;
and the third camera module has a high-magnification imaging function.
Compared with the prior art, the beneficial effect of this application:
1) according to the method, the local dry-type area is constructed on the periphery of the target area, and the image acquisition is carried out on the target area through the local dry-type area, so that the imaging light path of the target image is not affected by a water layer, the definition and the detection precision of the target image are improved under the condition that the liquid is stored in the water pool, and the micro defects can be effectively found.
2) The method can acquire the target image in two states of a dynamic local dry area and a static local dry area, and can acquire the image of the target area with poor underwater visibility so as to realize the detection of the target area.
3) In the device, the drainage unit can construct local dry-type region in the periphery of target region, has guaranteed the no water layer interval of imaging unit's formation of image light path, and the light path is not influenced by the water layer, under the circumstances that the pond banked up liquid, improves the definition and the detection precision of target image, can effectively discover small defect.
4) In the device, the light path and the target area of imaging unit are the L type, and are equipped with the speculum in the department of bending of the light path of imaging unit, and the incident ray of imaging unit and the incident angle of speculum are adjustable, guarantee that imaging unit can follow a plurality of angles and carry out image acquisition to the target area.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a schematic diagram illustrating an underwater video detection method according to an embodiment of the present application
Fig. 2 is a schematic structural diagram of an underwater video detection device according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of an underwater video detection device according to an embodiment of the present application;
FIG. 4 is a schematic view of an operating condition of the underwater video detection device shown in FIG. 2;
FIG. 5 is a schematic view of an operating state of the underwater video detection device shown in FIG. 2;
FIG. 6 is a partially enlarged view of the underwater video detection device shown in FIG. 5 in a working state;
fig. 7 is a schematic view of an operating state of the underwater video detection device shown in fig. 2.
Illustration of the drawings:
100 an imaging unit; 110 a first camera module; 120 a second camera module; 130 a third camera module; 200 an adjustment mechanism; 210 a first adjustment mechanism; 220 a second adjustment mechanism; 230 a third adjustment mechanism; 300 a drainage unit; 310 a housing body; 311 an air inlet; 312 air outlet; 320 a light-transmitting mirror; 330 a guidance and bump prevention assembly; 340 a seal assembly; 400 of protective cover; 500 water pool; 510, defect; 600 mirror.
Detailed Description
The following detailed description of embodiments of the present application will be provided in conjunction with the accompanying drawings, which are included to illustrate and not to limit the present application.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the term "connected" is to be interpreted broadly, e.g. as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In the description of the present application, it is noted that the terms "first" and "second", etc. are used merely to distinguish descriptions, and are not to be construed as indicating or implying relative importance.
According to one aspect of the application, an underwater video detection method is provided. Referring to fig. 1, the underwater video detection method includes:
s1, constructing a local dry area at the periphery of the target area;
s2, acquiring an image of the target area through the local dry area to obtain a target image;
and S3, analyzing the image characteristics in the target image and determining whether the target area has defects.
Specifically, the target area in this embodiment is the inner wall of the pool.
The working process and the working principle of the application are as follows:
under the condition that the liquid is stored in the water tank, when the defect detection is carried out on the inner wall of the water tank, the water can influence the definition and the detection precision of a target image, mainly because the transparency of the water is low and tiny inorganic and organic particles exist in the water, the particles can scatter light collected by the image, so that the definition of the target image is influenced, and tiny defects cannot be effectively found.
According to the method, under the condition that the liquid is stored in the water pool, the local dry-type area is constructed on the periphery of the target area, and the image acquisition is carried out on the target area through the local dry-type area, so that the imaging light path of the target image is not affected by a water layer, the definition and the detection precision of the target image are improved under the condition that the liquid is stored in the water pool, and the micro defects can be effectively found.
In one embodiment, in step S1, the method for constructing the local dry region includes:
determining a preselected area at the periphery of the target area;
and introducing gas with preset pressure into the preselected area to move water in the preselected area to the outside of the preselected area, wherein the preselected area forms a local dry area.
Specifically, the local dry area in the present embodiment is a dynamic local dry area, the preselected area is separated from the target area by a predetermined distance, a gap is left between the preselected area and the target area, and the distance between the preselected area and the target area is between 0 and 10 mm. In the moving process of image acquisition of the target area, the local dry area can still be used for acquiring images, the target area is dynamically scanned on the basis of ensuring the definition of image acquisition, the image acquisition efficiency is improved, and the micro defects of the target area can be quickly and effectively found.
Preferably, the pressure of the gas in the localized dry zone is adjusted to dynamically balance the pressure in the localized dry zone with the pressure outside the localized dry zone. In the moving process of image acquisition of the target area, the local dry area is always kept in a water-free layer state.
In one embodiment, in step S1, after the gas with the predetermined pressure is introduced into the preselected region to form the local dry region, and before the image acquisition is performed on the target region through the local dry region, the method further includes:
carrying out primary screening image acquisition on a target area through a local dry area;
and when the primary screening image is determined to have the defect characteristics with the preset resolution, moving the local dry area and enabling the local dry area and the target area to form a closed cavity.
Specifically, in the present embodiment, an image of the target area is captured through the local dry area in a dynamic state, and if the captured target image indicates that the target area has a defect, 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, and the definition and the detection precision of the target image are further improved.
In one embodiment, in step S1, the method for constructing the local dry region includes:
determining a preselected area at the periphery of the target area;
introducing gas with preset pressure into the preselected area to move water in the preselected area to the outside of the preselected area;
and adjusting the distance between the preselected area and the target area to form a closed cavity between the preselected area and the target area, wherein the preselected area forms a local dry area.
Specifically, the local dry region in the present embodiment is a static local dry region, the preselected region and the target region form a closed cavity, and an image can be captured through the local dry region in a static state, so that the definition and detection accuracy of the target image are improved, and a minute defect in the target region can be effectively found.
According to another aspect of the present application, an underwater video detection device is provided. Referring to fig. 2, the underwater video detection apparatus includes an imaging unit 100 and a drainage unit 300, the drainage unit 300 being used to construct a local dry area at the periphery of a target area; the local dry region has a predetermined spacing from the target region. The imaging unit 100 is used to acquire an image of the target area through the local dry area.
Specifically, the target area in this embodiment is the inner wall of the basin 500.
The working process and the working principle of the application are as follows:
the drainage unit 300 and the imaging unit 100 in the underwater video detection device detect the target area by using the underwater video detection method to detect whether the target area has defects. The drainage unit 300 can construct a local dry region at the periphery of the target region, and the imaging unit 100 collects images of the target region through the local dry region, so that the interval of no water layer in the imaging light path of the imaging unit 100 is ensured, the light path is not affected by the water layer, under the condition that the water pool 500 stores liquid, the definition and the detection precision of the target image are improved, and the micro defect 510 can be effectively found.
In one embodiment, the interval between the local dry region and the target region is zero, in this case, a closed cavity is formed between the local dry region and the target region, and the local dry region is a static local dry region used for image acquisition of the target region by the imaging unit 100 in a static state. The interval range between the local dry region and the target region is 0-10 mm, a gap is left between the local dry region and the target region, and the local dry region is a dynamic dry region and is used for image acquisition of the target region by the imaging unit 100 under the dynamic condition.
In one embodiment, referring to fig. 2, the drain unit 300 includes a housing 310 with an internal cavity structure. The cover 310 has an inwardly depressed flat structure, and the opening of the cover 310 faces the target region with a predetermined interval therebetween. The cover 310 is provided 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 in the shape of an isosceles trapezoid. The cover body 310 is provided with a plurality of air inlets 311 and air outlets 312 which are uniformly distributed. When the cover 310 is under water, gas with a predetermined pressure is introduced into the cover 310 and the virtual cavity through the gas inlet 311 via the gas inlet pipe, so that water in the cover 310 and the virtual cavity moves to the outside of the cover 310, and the virtual cavity filled with gas forms a local dry area.
Preferably, the pressure of the gas in the localized dry zone is adjusted to dynamically balance the pressure in the localized dry zone with the pressure outside the localized dry zone.
Preferably, the cover 310 is made of a rigid metal or non-metal material, so that the cover 310 can bear a certain pressure under water without damage.
It should be noted that the structures of the cover 310 and the virtual cavity disposed on the periphery of the target area of the cover 310 are only exemplary, and the structures of the cover 310 and the virtual cavity disposed on the periphery of the target area of the cover 310 are not particularly limited in the present application, and any structure that can form a local dry area between the target area and the drainage unit 300 falls within the scope of the present application.
In one embodiment, the drain unit 300 further includes a light transmissive mirror 320. The light-transmitting mirror 320 is disposed inside the housing 310 and on the optical path of the imaging unit 100. The light-transmissive mirror 320 includes a surface having a hydrophobic coating, and the surface of the light-transmissive mirror 320 is rapidly dried by the purge of the gas in the housing 310, thereby clearly displaying the target region.
In one embodiment, referring to fig. 2, the drainage cell 300 further includes a sealing assembly 340 and a guidance and bumper assembly 330. The guide and collision prevention assemblies 330 are disposed at both sides of the traveling direction of the drain unit 300.
In one embodiment, referring to FIG. 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 for collecting images of a target area, the underwater video detection device is vertically arranged above the target area.
In one embodiment, referring to fig. 3, the optical path of the imaging unit 100 is L-shaped; the reflection mirror 600 is disposed at the bend of the optical path of the imaging unit 100. When the underwater video detection device is used for collecting images of a target area, the underwater video detection device is transversely arranged above the target area, namely the imaging unit 100 is parallel to the target area, and the drainage unit 300 is perpendicular to the target area, so that the resistance of water to the device in the moving process can be effectively reduced.
Preferably, the incident angle between the incident ray of the imaging unit 100 and the incident angle of the reflecting mirror 600 is adjustable, so that the imaging unit 100 can acquire images of the target area from multiple angles. Specifically, the mirror 600 is connected to an output shaft of a driving motor, and the driving motor drives the mirror 600 to rotate so as to adjust an incident angle of the mirror 600 and an incident line of the imaging unit 100.
In one embodiment, referring to fig. 2 to 3, the underwater video detection device further includes a protective cover 400, the imaging unit 100 is disposed inside the protective cover 400, and the drainage unit 300 is connected to an opening of the protective cover 400. The protective cover 400 and the drainage unit 300 form a watertight compartment, and when the device is in a working state, after gas with preset pressure is introduced into the drainage unit 300, the interior of the protective cover 400 is in a micro-positive pressure state, so that the imaging unit 100 in the protective cover 400 is subjected to double waterproof protection.
In one embodiment, referring to fig. 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 requirement.
The first camera module 110 includes a high-speed camera module, and is mainly used for collecting images in a large range of a target area, and is less affected by water fluctuation in a water environment, so that a clear target image can be obtained.
The second camera module 120 has a low-magnification imaging function. The zoom lens of the zoom amplification camera module is driven by an electric motor, has a lower magnification function, is beneficial to obtaining details of a target area, and improves the detection precision of the target area.
The third camera module 130 has a high magnification imaging function. The super-depth-of-field microscopic imaging module has a larger focal length, and performs microscopic imaging on a target area at a relatively larger distance from the target area, so as to avoid interference between a lens and the drainage unit 300.
Preferably, the first camera module 110, the second camera module 120, and the third camera module 130 are all configured with independent illuminating lamps, so that the exposure of the first camera module 110, the second camera module 120, and the third camera module 130 is sufficient, and a clear target image can be effectively obtained.
Preferably, the second camera module 120 is configured with an anti-shake function, so as to ensure that the second camera module 120 is still in a stable state in the moving state, and can perform image acquisition on the target area.
It should be noted that the number of the 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 only exemplary, and the number of the 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 are not specifically limited in this application, and all the number and types that can achieve image acquisition on a target area and obtain a clear target image fall within the protection scope of this application.
In one embodiment, referring to fig. 2 to 3, the underwater video detection apparatus further includes an adjusting mechanism 200 for adjusting the position of the imaging unit 100 to adjust the detection range, the focal length and the sharpness of the imaging unit 100.
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 in the lateral direction in the horizontal plane, for expanding the detection range. The second adjustment mechanism 220 is used to drive the imaging unit 100 to move in the longitudinal direction in the horizontal plane, for expanding the detection range. The third adjustment mechanism is used to adjust the focal length and sharpness of the imaging unit 100. The first adjustment mechanism 210, the second adjustment mechanism 220, and the third adjustment mechanism 230 each have a fine adjustment function.
In one embodiment, the underwater video detection device is further provided with a control device, and the control device is connected with the imaging unit 100, the adjusting mechanism 200 and the drainage unit 300 in a communication manner.
The underwater video detection device in the embodiment detects a target area in a working process that:
one, normal mode
Referring to fig. 4, the first camera module 110 in the imaging unit 100 is used to directly observe and quickly search a target region 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 an appropriate detection range.
Two, dynamic local dry mode
Referring to fig. 5 and 6, after the target area is located in the conventional mode, the position of the drainage unit 300 is adjusted such that the drainage unit 300 is spaced apart from the target area by a predetermined distance, a gap is left between the drainage unit 300 and the target area, and a dynamic local dry area is constructed at the periphery of the target area using the drainage unit 300. 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 to make the second camera module 120 be on the central line of the drainage unit 300, the third adjustment mechanism 230 and the second camera module 120 are adjusted to set the required magnification, and a clear target image is obtained. The resolution of the target image is low. The image characteristics of the target image are determined 510 to determine if the target area is defective. At the moment, the device can collect the image of the target area in the moving process, and the imaging light path is always in a water-free layer state; the image of the target area can be obtained in turbid or low-visibility water environment.
Three, static local dry mode
Referring to fig. 7, after the dynamic local dry mode determines that the target area has a defect 510, the device is maintained in a static state, and the pressure of the gas in the local dry area is increased to enhance the drainage function of the local dry area. The distance between the drainage unit 300 and the target area is adjusted such that the drainage unit 300 is in contact with the target area to form a closed chamber. Then, the air outlet 312 of the enclosure 300 is opened, and hot air is introduced through the air inlet 311 to completely dry the target area, so as to reduce the air pressure and maintain the micro-positive pressure in the internal cavity of the enclosure 310. And adjusting the position of the third camera module 130 under a lower magnification to locate the defect 510 in the target area, and acquiring an image of the defect 510 under a higher magnification of the third camera module 130 to obtain a high-resolution target image.
In this mode, after the micro defect 510 is detected, the pressure of the gas in the local dry area is increased, the distance between the drainage unit 300 and the target area is adjusted, so that the drainage unit 300 and the target area keep a preset distance, a gap is left between the drainage unit 300 and the target area, and the gas is discharged from the bottom edge of the cover 310 and the gap between the bottom edge of the cover and the target area, so as to form a dynamic dry environment again. And continuing moving the device and repeating the detection steps.
The device can be used together with equipment such as an underwater robot, a tracked vehicle and a floater.
The beneficial effect of this application:
1) according to the method, the local dry-type area is constructed on the periphery of the target area, and the image acquisition is carried out on the target area through the local dry-type area, so that the imaging light path of the target image is not affected by a water layer, the definition and the detection precision of the target image are improved under the condition that the liquid is stored in the water pool, and the micro defects can be effectively found.
2) The method can acquire the target image in two states of a dynamic local dry area and a static local dry area, and can acquire the image of the target area with poor underwater visibility so as to realize the detection of the target area.
3) In the device of the present application, the drainage unit 300 can construct a local dry region at the periphery of the target region, thereby ensuring the interval of the imaging light path of the imaging unit 100 without water layer, and the light path is not affected by the water layer, so that under the condition of liquid storage in the pool 500, the definition and the detection precision of the target image are improved, and the micro defect 510 can be effectively found.
4) In the device in this application, imaging element 100's light path is the L type, and is equipped with speculum 600 in imaging element 100's the department of bending of light path, and imaging element 100's incident ray is adjustable with the incident angle of speculum 600, guarantees that imaging element 100 can follow a plurality of angles and carry out image acquisition to the target area.
5) According to the device, the imaging unit 100 selects the adaptive camera module according to the change of the water environment of the target area and the image acquisition requirement, and the quality of the target image is effectively guaranteed.
The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and substitutions can be made without departing from the technical principle of the present application, and these modifications and substitutions should also be regarded as the protection scope of the present application.
Claims (13)
1. An underwater video detection method, comprising:
constructing a local dry area at the periphery of the target area;
acquiring an image of the target area through the local dry area to obtain the target image;
and analyzing the image characteristics in the target image to determine whether the target area has defects.
2. The underwater video detection method according to claim 1, wherein the construction method of the local dry region comprises:
determining a preselected area at the periphery of the target area;
and introducing gas with preset pressure into the preselected area to enable the water in the preselected area to move out of the preselected area, wherein the preselected area forms the local dry area.
3. The underwater video detection method of claim 2, wherein the pressure of the gas introduced into the local dry region is adjusted to dynamically balance the pressure of the local dry region with the pressure outside the local dry region.
4. The underwater video detection method according to claim 2 or 3, wherein after the local dry region is formed by introducing gas with a predetermined pressure into the preselected region, and before image acquisition is performed on the target region through the local dry region, the method further comprises:
carrying out primary screening image acquisition on the target area through the local dry area;
and when the primary screening image is determined to have the defect characteristics with the preset resolution, moving the local dry area and enabling the local dry area and the target area to form a closed cavity.
5. The underwater video detection method according to claim 1, wherein the construction method of the local dry region comprises:
determining a preselected area at the periphery of the target area;
introducing gas with preset pressure into the preselected area to enable water in the preselected area to move out of the preselected area;
and adjusting the distance between the preselected area and the target area so that the preselected area and the target area form a closed cavity, wherein the preselected area constitutes the local dry area.
6. An underwater video detection device, comprising:
a drainage unit for constructing a local dry region at the periphery of the target region; the local dry area and the target area have a predetermined interval therebetween;
and the imaging unit is used for acquiring the image of the target area through the local dry area.
7. The underwater video detection device of claim 6, wherein the drain unit comprises:
the mask body is of an inwards-concave flat structure, and an opening of the mask body faces the target area and has a preset interval with the target area;
when the cover body is positioned underwater, gas with preset pressure is introduced into a virtual cavity formed by the cover body and the target area, and the virtual cavity filled with the gas forms the local dry area.
8. The underwater video inspection device of claim 7, wherein a light-transmissive mirror is disposed inside the housing.
9. The underwater video detection device of claim 7, wherein the optical path of the imaging unit is perpendicular to the target area.
10. The underwater video detection device of claim 7, wherein the optical path of the imaging unit is L-shaped; and a reflector is arranged at the bending part of the light path of the imaging unit.
11. The underwater video detection device of claim 10, wherein the incident angle of the mirror to the incident line of the imaging unit is adjustable.
12. The underwater video detection device of any one of claims 6 to 11, wherein the drainage unit is further provided with a guide and bump guard assembly.
13. The underwater video detection device of claim 12, wherein the imaging unit comprises:
a first camera module;
the second camera module has a low-magnification amplification imaging function;
and the third camera module has a high-magnification imaging function.
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| CN101256336A (en) * | 2008-02-20 | 2008-09-03 | 中国人民解放军91872部队上海研究室 | Movable underwater dry-basis camera |
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| CN101256336A (en) * | 2008-02-20 | 2008-09-03 | 中国人民解放军91872部队上海研究室 | Movable underwater dry-basis camera |
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