KR20150031510A

KR20150031510A - Draught measuring system of ship

Info

Publication number: KR20150031510A
Application number: KR20130110778A
Authority: KR
Inventors: 김학곤
Original assignee: 현대중공업 주식회사
Priority date: 2013-09-16
Filing date: 2013-09-16
Publication date: 2015-03-25

Abstract

The present invention relates to a draft measurement system of a ship, which comprises: a camera unit taking pictures of a water line; an image processing unit extracting a water level value from the pictures; and an operation program unit monitoring a draft level. The draft measurement system of a ship is capable of conveniently measuring the draft of a ship without a small boat, a portable draft reading gauge, an installed weight and a U-tube when lightweight measurement and deadweight measurement checking the center of gravity and light weight of a hull are performed, thereby facilitating lightweight measurement and deadweight measurement. In addition, the draft measurement system of a ship is provided to allow measuring work to be performed in a safe state when the draft of a hull is measured, thereby securing safety and having the economic effects of reducing expenses caused by the lightweight and deadweight measurement.

Description

[0001] Draft measuring system of ship [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a draft measurement system for a ship, and more particularly, to a draft measurement system for a ship which automatically measures the draft level using a recently-popularized image processing technique.

Generally, the ship will be launched from the dock after the ship is completed. At this time, seawater is injected into the dock where the ship is launched, so that the ship floats. At this time, if the ship is floating normally, the draft of the bow and stern of the ship is visually determined and the abnormality is judged based on the measured value do.

At this time, the degree of draft is checked on the basis of the measured value of the draft, and when the hull is inclined, a weight is installed in a direction opposite to the direction of inclination to achieve balance.

In such a conventional technique, a personal error may occur depending on the measurement of the measurer, and a problem may arise in the reliability of the measured value.

In addition, since the conventional art requires a large number of resident personnel such as observation personnel at the time of launching, there is a problem that labor costs due to manpower management are excessively generated.

Korean Patent Publication No. 10-2013-0068305

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art, and it is an object of the present invention to provide an apparatus and method for monitoring a draft of a watercraft including a camera for photographing a waterline, an image processing unit for extracting a water level value from a camera image, So that the draft value of the hull can be measured in real time without the observer residing, and thereby the hull can be quickly balanced for maintaining the balance.

According to an aspect of the present invention, there is provided an image processing apparatus including a camera unit for photographing a water line; An image processing unit for extracting a water level value from a camera image; And an operation program unit for monitoring the draft level. The system for measuring the draft of a ship may be provided.

In addition, the camera unit may include an infrared camera mounted on the main body, an LCD display unit for confirming an image photographed by the infrared camera, and a tilt driver for adjusting an angle of view of the main body .

In addition, the image processing unit may include an embedded PC for camera image reception, sea level and water line recognition, noise processing, water level measurement and tilt angle control, and may transmit signals processed in the embedded PC to an operation program unit, And a power unit for driving the embedded PC and the communication unit are formed.

In addition, the operation program unit receives data of the image processing unit, displays the received data in a graph, backs up data, or generates a reporter.

Further, the image processing unit is installed inside the main body housing of the camera unit.

The method of measuring the level of the image processing unit may further include: a camera image receiving step (s11); Clustering camera images using a clustering algorithm (s12); Hull classification step (s13); Sea level dividing step (s14); Water line classification step (s15); Setting the waterline area to the RIO area (s16); A step (s17) of enhancing the image quality of the target image by stretching the ROI region; Extracting an inter-pixel edge in the stretched image (s18); Measuring the similarity of the waterline DB and the edge (s19); Scoring the degree of similarity and ignoring the threshold value or less (s20); And calculating a water level value (s21).

In addition, the tilt angle control method of the image processing unit may include: a step (s31) of designating a sea surface recognition period by manually operating a tilt angle of the camera; A step (s32) of receiving a camera image; Confirming whether the sea level exists in the designated section (s33); If the sea level exists below the designated section, the tilt change amount is calculated (s35) to lower the tilt angle (s36); And a step (s38) of increasing the tilt angle by calculating a tilt change amount when the sea surface is present on the designated section (s37).

The present invention provides an engine draft monitoring system including a camera section for photographing a water line, an image processing section for extracting a water level value from a camera image, and an operation program section for monitoring a draft level, It is possible to measure the value in real time, and thereby, it is possible to quickly perform the operation for maintaining balance of the hull.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a photograph showing a preparation process of a conventional method.
2 is a photograph showing a manual gauge of a conventional method.
3 is a photograph showing a measurement example of a conventional method.
4 is a photograph showing a measurement value recording embodiment of the conventional method.
5 is a conceptual diagram for explaining a ship draft measurement system according to the present invention.
6 is a block diagram for explaining a ship draft measurement system according to the present invention.
7 is a perspective view illustrating a camera unit and an image processing unit according to the present invention.
8 is a flowchart illustrating a draft measurement method according to the present invention.
9 is a flowchart illustrating a tilt angle adjusting method of a camera unit according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 5 is a conceptual view for explaining a ship draft measurement system according to the present invention, and FIG. 6 is a block diagram for explaining a ship draft measurement system according to the present invention.

As shown in the figure, the present invention includes a camera unit 100 for photographing a water line, an image processing unit 200 for extracting a water level value from a camera image, and an operation program unit 300 for monitoring a draft level do.

In this case, the camera unit 100 is provided with an infrared camera 110, an LCD display unit 120 for confirming an image captured by the infrared camera 110, A tilt driving unit 150 is provided to adjust the tilt angle.

In the present invention, the image processing unit 200 may be installed inside the main body housing of the camera unit 100.

7 is a perspective view illustrating a camera unit and an image processing unit according to the present invention.

As shown in the figure, the camera unit 100 includes various components in a housing that can be opened and closed at an upper portion thereof, and the image processing unit 200 can be mounted together.

The camera unit 100 may be mounted on the ground using a tripod 160 and a tilt driving unit 150 may be provided on the connecting portion of the tripod 160 to adjust the angle.

The tilt driver 150 adjusts the tilt angle of the camera according to the level of the dock. At this time, a PTZ controller for controlling the tilt angle of the camera can be mounted.

In addition, the lens 130 of the camera may be provided with a polarization filter 140.

In the present invention, the infrared camera 110 is used to operate the draft measurement system at night. In order to check whether the camera is pointing to the optimum position for measuring the waterline, a window of the LCD display unit 120 is separately Respectively.

In addition, the embedded PC 210 for processing image data is installed inside the camera housing to secure the mobility of the equipment.

In addition, the communication unit 220 (Wibro modem) for transmitting the measured level data to the operating program is mounted on the embedded PC 210. [

The image processing unit 200 includes an embedded PC 210 for camera image reception, sea level and water line recognition, noise processing, water level measurement, and tilt angle control, and a signal processed by the embedded PC 210 A communication unit 220 for transmitting control signals to the operation program unit 300 or receiving control signals from the operation program unit 300 and a power supply unit 230 for driving the embedded PC 210 and the communication unit 220 are formed do.

The operation program unit 300 receives the data of the image processing unit 200, displays the received data in a graph, backs up data or generates a reporter. The operation program unit 300 includes a monitoring PC 310 and a monitor 320 ).

8 is a flow chart for explaining a draft measurement method according to the present invention.

As shown in the figure, the method of measuring the water level of the image processing unit 200 may proceed to the following steps.

First, after the camera image reception step s11, the camera image is clustered using a clustering algorithm s12, and the hull classification step s13, the sea level classification step s14, the water line classification step s15 ).

After setting the waterline area to the RIO area (s16), the ROI area is stretched to improve the image quality of the target image (s17), and the inter-pixel edge in the stretched image is extracted (s18) .

The step s19 of measuring the degree of similarity between the waterline DB and the edge includes a step s20 of scoring the degree of similarity and ignoring the value below the threshold value and a step s21 of calculating a water level value.

Here, the clustering algorithm refers to a method in which a template (template) for a comparison target pattern is prepared in advance, and a pattern to be recognized is subjected to a normalization process to match the template configuration condition, and the pattern is recognized using a degree of similarity such as cross- .

Also, ROI (Region Of Intersection) means that the result of image processing is applied only to a specified range (ROI) in the entire image.

In addition, the edge is a boundary between objects constituting a digital image, and the edge of a digital image recognizes an object identification, a position / shape / size, and provides information to detect a direction.

9 is a flowchart illustrating a tilt angle adjusting method of the camera unit according to the present invention.

The tilt angle control method of the image processing unit 200 of the present invention as shown in the figure may proceed to the following steps.

First, a step (s31) of designating a sea level recognition section by manually operating a tilt angle of the camera is performed, a step (s32) of receiving a next camera image, and a step of checking whether a next sea level exists in a designated section If the next sea level exists below the designated section, the tilt variation is calculated (s35) to lower the tilt angle (s36). If the sea level is above the designated section, the tilt variation is calculated (s37) to increase the tilt angle (s38).

As described above, according to the present invention, there is provided an infeed draft monitoring system including a camera for photographing a water line, an image processing unit for extracting a water level value from a camera image, and an operation program unit for monitoring a draft level, It is possible to measure the draft value of the hull in real time, and it is possible to quickly perform the hull balancing operation.

In the case where the center of gravity is not aligned by the above-described measuring method, a weight is provided on the recess of the hull to correct the center of the hull to correct the center of gravity. These weights can be removed after hull drying.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. For example, a person skilled in the art can change the material, size and the like of each constituent element depending on the application field or can combine or substitute the embodiments in a form not clearly disclosed in the embodiments of the present invention, Of the range. Therefore, it should be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive, and that such modified embodiments are included in the technical idea described in the claims of the present invention.

100:
110: Infrared camera
120: LCD display unit
130: lens
140: polarizing filter
150: a tilt driving part
160: Tripod
200: an image processor 200,
210: Embedded PC
220:
230:
300: Operation Program Department
310: Monitoring PC
320: Monitor

Claims

A camera unit 100 for photographing a waterline;
An image processor 200 for extracting a water level value from a camera image; And
And an operation program unit (300) for monitoring the draft level.

The method according to claim 1,
The camera unit 100 includes an infrared camera 110 mounted on the main body 100 and an LCD display unit 120 for confirming images captured by the infrared camera 110, And a tilt driving unit (150) for measuring the draft of the ship.

The method according to claim 1,
The image processing unit 200,
An embedded PC 210 for camera image reception, sea level and water line recognition, noise processing, water level measurement and tilt angle control is provided, and the signal processed by the embedded PC 210 is transmitted to the operation program unit 300 or operated And a power supply unit 230 for driving the embedded PC 210 and the communication unit 220 are formed on the bottom surface of the ship, .

The method according to claim 1,
The operation program unit 300,
Wherein the control unit receives data of the image processing unit (200), displays the received data in a graph, backs up the data, or generates a reporter.

The method according to claim 1,
Wherein the image processing unit (200) is installed inside the main body housing of the camera unit (100).

The method of claim 3,
A method of measuring a level of the image processing unit (200)
A camera image receiving step (s11);
Clustering camera images using a clustering algorithm (s12);
Hull classification step (s13);
Sea level dividing step (s14);
Water line classification step (s15);
Setting the waterline area to the RIO area (s16);
A step (s17) of enhancing the image quality of the target image by stretching the ROI region;
Extracting an inter-pixel edge in the stretched image (s18);
Measuring the similarity of the waterline DB and the edge (s19);
Scoring the degree of similarity and ignoring the threshold value or less (s20); And
And calculating a water level value (s21).

The method of claim 3,
The tilt angle control method of the image processing unit (200)
A step (s31) of manually specifying a tilt angle of the camera to specify a sea surface recognition interval;
A step (s32) of receiving a camera image;
Confirming whether the sea level exists in the designated section (s33);
If the sea level exists below the designated section, the tilt change amount is calculated (s35) to lower the tilt angle (s36); And
If the sea level is present on the designated section, the tilt change amount is calculated (s37) to increase the tilt angle (s38); Wherein the vessel draft measuring system comprises: