JP2003028745A - Oil leakage detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately grasp an oil-leakage position and an oil leakage region in an early stage. SOLUTION: A predetermined image picking-up area on a sea surface is scanned to be image-picked up by an infrared camera device 3, a numerical wave value of the sea surface when the image picking-up area is image-picked up is found, a concentration difference between picture elements in a position corresponding to the image picking-up area when the image picking-up area is image-picked up by the infrared camera device 3 succesively time-serially is found by a difference computing means, the concentration difference found by the difference computing means is binalized by a binalization means using at least the first threshold based on the numerical wave value, and an image picked-up area portion where a binalized output value exceeding the first threshold is generated is determined as the oil leakage area by an oil leakage detecting part 112.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil leak detection device for detecting oil leakage to the sea, and more particularly to an oil leak detection device for detecting oil leakage by monitoring the sea with an infrared camera device. Regarding

[0002]

2. Description of the Related Art Conventionally, oil leak detection from a submarine oil pipeline or the like is carried out by finding oil floating on the surface of a sea by a ship or a surveillance ship navigating in a predetermined sea area or drifting to the coast. It was done by the people in the surrounding area visually finding it.

[0003]

Therefore, not only the situation of the oil leak but also the early detection of the oil leak cannot be detected, and the exact position and range of the oil leak cannot be grasped, resulting in a serious environmental damage to marine pollution. There was a problem of reaching.

In addition, the aircraft is equipped with a laser light source and a spectrum analyzer, the laser light is emitted from the laser light source to the sea surface, the reflected laser light from the sea surface is received by the spectrum analyzer, and the oil of the sea surface is analyzed by signal analysis of the received signal. Although it is also considered to detect leaks, there are places where it is difficult to use aircraft in specific sea areas, it is expensive, and continuous detection is difficult, which is not practical. was there.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an oil leak detection device capable of accurately and early detecting an oil leak position and an oil leak range.

[0006]

According to a first aspect of the present invention, there is provided an oil leak detection device, which comprises an observing means by an infrared camera device for scanning and imaging a predetermined imaging area of the sea surface.
Wave numerization means for obtaining the wave numerical value of the sea surface when the imaging area is imaged, and the density between pixels at positions corresponding to the imaging area when the imaging area is subsequently imaged by the infrared camera device. The difference calculating means for obtaining the difference and the density difference obtained by the difference calculating means are binarized by a first threshold value based on at least the wave numerical value. 2
It is characterized in that the imaging area portion in which the output value of the binarizing means that exceeds the threshold value and the threshold value is generated is an oil leak area.

According to the oil leak detection apparatus of the first aspect of the present invention, the numerical value of the wave is obtained based on the wave shape of the sea surface when the infrared camera device picks up the image of the imaging area. On the other hand, the infrared camera device obtains the density difference between pixels at corresponding positions in the imaging regions when the imaging regions are successively imaged. This density difference corresponds to the temperature difference between corresponding portions in each scan of the imaging region, and the density difference is binarized by the binarizing means by at least the first threshold value based on the wave numerical value. The binarized output by this binarization corresponds to the sea surface temperature change between the corresponding pixels, and it can be seen that the region portion where the binarized output has occurred is the oil leakage region.

Generally, the temperature of the oil fed to the submarine oil pipeline is usually high (50 to 90 degrees Celsius), so if a pipe is cracked, oil leaks and the leaked oil reaches the sea surface. Come up. Due to the difference in specific gravity and physical properties between oil and seawater, oil and seawater are not hydrophilic and are unlikely to mix with each other. The temperature of the oil produced does not drop extremely even under the influence of seawater temperature.

Therefore, according to the oil leak detecting apparatus of the present invention, the oil leak can be detected from the difference between the oil temperature and the sea surface temperature.

According to a second aspect of the present invention, there is provided an oil leak detecting device, which comprises an observing means by an infrared camera device for scanning a predetermined imaging area of the sea surface, and a wave for obtaining a numerical value of the sea surface when the imaging area is imaged. Quantifying means,
A difference calculation means for obtaining a density difference between pixels at positions corresponding to the image pickup area when the image pickup area is picked up successively by the infrared camera device, and a difference output obtained by the difference calculation means is at least a wave number value. First based on
Binarizing means for binarizing the sea surface temperature of the entire imaging region, and a difference calculated by the difference calculating means exceeds the first threshold. In the image pickup area, the image pickup area portion which is determined to have the sea surface temperature detected by the sea surface temperature detection means exceeding a second threshold value set in advance is discriminated as an oil leak area. , Is provided.

According to the oil leak detection apparatus of the second aspect of the present invention, the wave numerical value is obtained based on the wave shape of the sea surface when the infrared camera apparatus picks up the image pickup area. On the other hand, the density difference between pixels at corresponding positions between the image pickup areas is obtained when the image pickup areas are successively picked up by the infrared camera device. This density difference corresponds to the temperature difference between corresponding portions in each scan of the imaging region, and the density difference is binarized by the binarizing means by at least the first threshold value based on the wave numerical value. The binarized output by this binarization corresponds to the change in the sea surface temperature between the corresponding pixels, and it is possible to determine that the region where the binarized output has occurred is the oil leakage region. There are cases where sea surface temperature is rising for reasons other than oil leaks.

However, the sea surface temperature of the entire imaging area is substantially detected by the sea surface temperature detecting means, and the difference obtained by the difference calculating means exceeds the first threshold value of the binarizing means. In, the image pickup area portion where it is determined that the sea surface temperature detected by the sea surface temperature detecting means exceeds the second threshold value set in advance is determined to be the oil leak area.

By doing so, even when the sea surface temperature is rising for reasons other than oil leakage,
Accidental detection of oil leak is avoided.

In the oil leakage detection apparatus according to the first or second aspect of the present invention, the first threshold value may be a threshold value obtained by compensating the threshold value based on the wave numerical value with the threshold value calculated by the discriminant analysis method.

This is because when the wave is large, the density based on the output from the infrared camera device becomes large and it is judged that the temperature has risen. However, the first threshold value based on the numerical value of the wave is calculated by the threshold value calculated by the discriminant analysis method. By compensating,
The increase in concentration due to the output from the infrared camera device when the wave number is large is substantially compensated, and false detection of oil leakage is avoided.

In the oil leak detection apparatus according to the first or second aspect of the present invention, the numerical value of the wave by the numerical wave numerical means may be obtained on the basis of the wave shape when the sea surface is calm. When this is done, the wave numerical value can be obtained accurately.

In the oil leak detection apparatus according to the second aspect of the present invention, the oil leak detection apparatus is provided with a temperature sensor for detecting a predetermined temperature of the sea surface in the image pickup area, and is obtained based on the image pickup output from the infrared camera apparatus. The sea surface temperature of the entire imaging region may be compensated by the temperature detected by the temperature sensor to obtain a substantial sea surface temperature.

In this case, the concentration based on the output from the infrared camera device does not directly indicate the temperature of the sea surface, but is compensated by the temperature of the sea surface detected by the temperature sensor. Then, it corresponds to the measured temperature.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an oil leak detection device according to the present invention will be described with reference to embodiments.

FIG. 1 is a block diagram showing the structure of an oil leak detection apparatus according to an embodiment of the present invention.

An oil leak detection device 1 according to an embodiment of the present invention is a cooling type infrared camera device 3 for imaging the sea surface over a predetermined area, and an infrared camera device 3.
CCD camera device 4 which is a visible camera device for imaging the sea surface in the same area as the area illuminated by the, and temperature sensor 15 for detecting the temperature of the sea surface at the sea area imaged by the infrared camera device 3 and the CCD camera device 4. And a wave height sensor 16 for detecting a wave height value at a predetermined sea area location in the same area as described above.

The infrared camera device 3 is provided with an electric swivel base 31 forming a pan head and an infrared camera body 32 mounted on the electric swivel base 31 for sending digital image pickup signal data. Then, the infrared camera main body 32 scans and captures an image over a predetermined sea surface region by the left turn right turn drive.

The CCD camera device 4 is an electric swivel base 41 forming a pan head, and a search light 4 mounted on the electric swivel base 41.
2 and a CCD camera body 43 that is mounted on the search light 42 and sends out digital image pickup signal data. The CCD camera body 43 scans the image pickup area in synchronization with the scanning by the infrared camera device 3 and picks up an image.

The oil leak detection apparatus 1 further receives image pickup signal data from the infrared camera body 32, and
The infrared camera device observation station 5 sends a drive signal to the electric swivel base 31, and the CCD camera device observation station 7 sends image data of the image pickup signal from the CCD camera body 43 and sends a drive signal to the electric swivel base 41. The observation station 9 is provided, and the oil leak is detected by receiving the imaging signal data from the observation station 9 provided at a position remote from the observation station 9,
In addition, a monitoring station 17 that sends a drive signal to the electric swivel bases 31 and 41 via the observation station 9 is provided.

Between the observation station 9 and the monitoring station 17, the observation station 9
From the optical signal to the observation station 9 and an electric / optical converter 61 for converting the signal to the observation station 9 into an electric signal, and the signal from the monitoring station 17 into an optical signal to output the signal to the monitoring station 17. It is connected by an optical fiber 63 connecting an optical / electrical converter 62 for converting into an electric signal, and enables the infrared camera device 3 and the CCD camera device 4 to remotely monitor a captured image on the sea surface.

Here, the infrared camera device 3, the CCD camera device 4 and the observing station 9 are, for example, according to the seabed pipeline, on a coast, a fixed steel tower protruding to the sea, or a mast of a mooring buoy with a rocking device. Is installed.

The monitoring station 17 is, for example, an oil company,
It will be installed in the pipeline management office of the public corporation.

The infrared camera device observing station 5 includes a distributor 51 for receiving the image pickup signal data output from the infrared camera main body 32, and a color monitor for receiving the image pickup signal data via the divider 51 and displaying an image of the imaged sea surface. 52 and a drive control signal output from the monitoring station 17, and controls the elevation and depression angles of the electric swivel base 31 via the servo amplifier 54, and sends the temperature signal detected by the temperature sensor 15 to the monitoring station 17. The control section 53 for sending out is provided, and the image pickup signal data via the distributor 51 is sent out to the monitoring station 17.

The CCD camera device observation station 7 includes a distributor 71 for receiving the image pickup signal data output from the CCD camera body 43, and a color monitor for displaying the image of the imaged sea surface by receiving the image pickup signal data via the distributor 71. 72 and a drive control signal output from the monitoring station 17 to control the elevation and depression angles and the turning angle of the electric swivel base 41 via the servo amplifier 75, and send the wave height signal from the wave height sensor 16 to the monitoring station 17. The image pickup signal data via the distributor 71 is sent to the monitoring station 17.

The monitoring station 17 includes the infrared imaging monitoring station 11 and C
A CD imaging monitoring station 13 is provided.

The CCD image pickup monitoring station 13 comprises a video interface 131, a color monitor 132, and a control section 133.

The control unit 133 sets the image pickup start position by the infrared camera device 3 and the CCD camera device 4 by latitude and longitude, and sets the image pickup area by specifying the pan and tilt range of the electric swivel base 41. Receiving a signal from the operation panel 115 that sets the scanning speed by setting the pan speed and the tilt speed C
It has a control circuit made of PU and a memory made of RAM, and based on a signal from the operation panel 115, a start position setting unit that sets an image pickup start position by the CCD camera body 43 by latitude and longitude, and an electric swivel base 41. Image pickup area designating section for designating an image pickup area based on the pan and tilt range, a scanning speed setting section for setting pan speed and tilt speed, and a control section based on the scanning speed set by the scanning speed setting section within the image pickup area. A control signal transmission unit for transmitting a control signal for controlling the electric swivel base 41 via 73,
Receiving the wave height data from the wave height sensor 16 sent through the control unit 73, the wave shape when the sea surface is calm is compared with the wave shape at each time point, and the wave shape when the sea surface is calm is used as a reference. And a wave quantification unit that quantifies the wave state at each time point by recognizing the waveform and obtains quantized wave data.

Here, the wave numerical value in the monitoring sea area may be obtained by interpolating approximation calculation from the data obtained from a plurality of wave height meters installed in the imaging area which is the monitoring sea area. The wave numerical value based on the wave shape of the sea surface may be obtained from the output data of the CCD camera device 4 that scans the imaging area in synchronization with the scanning.

The color monitor 132 is a CCD input via the distributor 71 and the video interface 131.
An image based on the image pickup signal data from the camera device 4 is displayed over the image pickup area.

The infrared imaging monitoring station 11 includes an image processing section 11
1, an oil leak detection unit 112, a color monitor 113, and a control unit 114.

The image processing unit 111 receives the image pickup signal data output from the infrared camera device 3 via the distributor 51, and under the control of the control unit 114, performs a pseudo color process or the like.

The oil leak detecting section 112 detects oil leak under the control of the control section 114 based on the signal subjected to the pseudo color processing.

The color monitor 113 displays an image based on the signal subjected to the pseudo color processing under the control of the control unit 114.

The control unit 114 controls the electric swivel base 31 via the control unit 53 so that scanning within the image pickup region by the infrared camera device 3 is synchronized with the CCD camera device 4 over the image pickup region by the CCD camera device 4. Let it be done.

On the operation panel 115, as described above,
The image capturing start position by the infrared camera device 3 and the CCD camera device 4 is set by latitude and longitude, and the image capturing area is set by specifying the pan and tilt range of the electric swivel base 41, and the pan speed and tilt speed are set. The scanning speed is set by the setting.

The control unit 114 includes a control circuit including a CPU that receives a signal from the operation panel 115 and a memory including a RAM. Based on the signal from the operation panel 115, the imaging start position of the infrared camera main body 32. Is a latitude / longitude setting start position setting section, an imaging area specification section that specifies an imaging area based on the pan / tilt range of the electric swivel base 31, and a scanning speed setting section that sets pan speed and tilt speed. And a control signal transmission unit that transmits a control signal for controlling the electric swivel base 31 via the control unit 53 at the scanning speed set by the scanning speed setting unit in the imaging area.

The image processing unit 111 receives a control signal from the control unit 114, for example, as shown in FIG.
Output image information from the image information acquisition module 20
1 and the color bar signal output from the color bar generation module 202 and the color table module 2
A color video signal is processed in cooperation with the color table stored in 03, for example, 16-color pseudo-coloring processing is performed and the result is stored in the image memory module 204, and the pseudo-colorized color video signal is detected as an oil leak. It is sent to the unit 112 and is sent to the color monitor 113 via the interface circuit 205 for display.

The image processing section 111 further includes a control section 53.
And the temperature sensor 15 sent out via the control unit 114.
A temperature compensating unit is provided for receiving the detected sea surface temperature data from the device and compensating the actual temperature value of the temperature of the sea surface of the imaging area based on the imaging signal data output from the infrared camera body 32.

The oil leak detection unit 112 includes an image processing unit 111.
Based on the image pickup signal data from the infrared camera main body 32 via, the density difference data between pixels at corresponding positions in the image pickup areas when the image pickup areas are picked up successively by the infrared camera main body 32 are obtained. The difference detection unit that substantially detects changes in sea surface temperature and the threshold table in the RAM that stores the threshold data for the digitized wave data are referenced, and these threshold data are set as the first threshold,
A binarization unit that binarizes the sea surface temperature change obtained by the difference detection unit based on a first threshold value and uses a pixel portion equal to or greater than the first threshold value as an oil leak portion; The position of the image pickup area is obtained from the image pickup start position, the image pickup area, and the scanning speed based on the pan speed and the tilt speed, and a detection display processing unit that displays an oil leak and a classification when the oil leak is not detected by the oil leak detection unit A non-detection display processing unit that obtains the position of the area and displays a non-oil leak is provided.

Here, the density difference data is the temperature based on the density at the pixel position when the infrared camera device 3 captures the imaged area and the density at the corresponding pixel position when the imaged area is captured immediately before in time. It corresponds to the temperature difference based on. Therefore, the density difference data is binarized by the first threshold value based on the wave numerical value, the binarized output corresponds to the sea surface temperature change between the corresponding pixels, and the binarized output is generated. It can be seen that the area part is the oil leakage area.

The operation of the oil leak detection system 1 according to the embodiment of the present invention configured as described above will be described with reference to the flowcharts of FIGS. 3 and 4.

When the initial setting routine is executed, the image pickup start position, the image pickup area, the infrared camera body 32 and the CCD camera body 43 are set based on the settings on the operation panel 115.
Scanning direction, scanning speed based on pan speed and tilt speed, on / off of wiper of infrared camera body 32 and CCD camera body 43, infrared camera body 3
2 and the focal length and sensitivity of the CCD camera body 43 are set (step S1), and then it is checked whether the oil leak is detected automatically or manually (step S2), and it is determined that the oil leak is automatically detected. At this time, the initial setting is completed and the imaging routine is executed (step S3). When it is determined that the oil leak is manually performed, the initial setting is completed, and the oil leak detection is manually performed (step S4).

When the image pickup routine S3 is entered, the operation panel 1
Under the control of the control units 114 and 133 receiving the signal from the control unit 15, the electric swivel bases 31 and 41 are controlled synchronously via the control unit 53 and the servo amplifier 54, and the control unit 73 and the servo amplifier 75. Then, the infrared camera main body 32 and the CCD camera main body 43 scan the imaging area, and the imaging signal data output from the infrared camera main body 32 and the imaging signal data output from the CCD camera main body 43 are stored in a memory over the imaging area. It is stored (step S11).

Then, the next image pickup signal data and the CCD output from the infrared camera body 32 over the image pickup area are output.
The next image pickup signal data over the image pickup area output from the camera body 43 is stored in the memory (step S1).
2).

Following step S12, step S11
And the pixel density based on the image pickup signal data output from the infrared camera body 32 stored in step S12.
The density difference data, which is the difference from the density of the pixel based on the corresponding image pickup signal data output from the infrared camera body 32 stored in step S13, is obtained (step S13). Here, the density of the pixel based on the image pickup signal data output from the infrared camera main body 32 corresponds to the temperature of the sea surface, and the density difference data in step S13 corresponds to the image pickup area taken successively in time. The density difference between pixels corresponding to the area difference, which corresponds to the temperature difference.

However, since the temperature of the oil fed to the subsea oil pipeline is usually high, the leaked oil floats to the sea surface when the pipe is cracked, but the temperature of the leaked oil floats to the sea surface. Does not fall extremely regardless of the influence of seawater temperature. Therefore, if there is no oil leak, the concentration difference (temperature difference) between the pixels of the difference result is close to zero, but if there is an oil leak, there will be a certain period of time after the oil leak occurs, that is, until the sea surface temperature saturates The density difference (temperature difference) of is a positive (plus) value other than zero,
Since the oil leakage can be detected based on the change in the density between these pixels, the difference is calculated.

Since the density difference data calculated in step S13 contains noise due to waves or the like, it is smoothed following step S13 (step S1).
4).

Subsequent to step S14, from the data obtained from a plurality of wave height meters set in the monitoring area or the digitized wave data based on the image pickup signal data output from the CCD camera body 43 detected in step S12,
The difference data smoothed in step S14 is binarized with the threshold value obtained by the automatic threshold setting by the discriminant analysis method by adding the wave numerical data of the monitoring sea area by the interpolation approximation calculation (step S15). Here, the reason why the difference data is binarized by the threshold value based on the digitized wave data is to correspond to the wave condition of the sea surface and the change of the sea surface environment.

Therefore, in the binarization process in step S15, the binarization process based on the sea surface condition is performed.

This is because when the wave is high, the temperature value based on the output of the infrared camera main body 32 is high, and therefore the threshold value is raised based on the wave data. That is, when binarizing with a fixed threshold value instead of the threshold value based on the digitized wave data, the condition based on the sea surface state cannot be dealt with.

Next, step S16 is executed. In step S16, the sea surface temperature based on the imaging signal data output from the infrared camera body 32 is the temperature sensor 1
The actual temperature value is compensated by the detected temperature data of 5, and the threshold value is set based on the temperature-compensated sea surface temperature.

Here, since the sea surface temperature based on the image pickup signal data output from the infrared camera main body 32 is not the measured temperature but the relative temperature, the temperature compensation process is performed by the temperature detected by the temperature sensor 15.

In step S16, step S15
When it is determined that the sea surface temperature in the output region that is equal to or higher than the first threshold value is equal to or lower than the second threshold value based on the temperature-compensated sea surface temperature by the binarization process in step S16, the oil is continuously connected to step S16. It is determined that there is no leakage, the oil leakage-free processing is executed, the non-oil leakage display is performed, and the processing is repeatedly executed from step S11 (step S19).

When it is determined that the sea surface temperature in the output region which is equal to or higher than the first threshold value in the binarization processing in step S15 exceeds the second threshold value based on the temperature-compensated sea surface temperature in step S16. Is determined to have an oil leak, the position of the imaging region divided into the oil leak is obtained, an oil leak present process for notifying that there is an oil leak is executed, and then repeatedly executed from step S11. (Step S1
8).

The notification of the oil leak processing in step S18 is performed by not only the oil leak is notified by a voice signal but also the image notification is performed.

In step S18, the positions of the divided image pickup areas are the image pickup start position, the image pickup area, and the electric swivel base 3.
The latitude and longitude can be obtained by calculation from the elevation / depression angle and the turning angle due to the pan / tilt drive by 1 and 41.

Although the oil leak can be detected by setting the area exceeding the first threshold value in step S15 as the oil leak area, the sea surface temperature may rise due to a cause other than the oil leak. In this case, by executing step S16,
In addition to the result of binarization of 15, it is possible to be confident of an oil leak due to the sea surface temperature, and it is possible to prevent erroneous detection of an oil leak.

Further, step S17 is provided between step S16 and step S18, and when the temperature-compensated sea surface temperature is equal to or higher than a threshold value that establishes a separately determined upper limit, it is determined that an abnormal environment has occurred and step S19 is executed. Alternatively, step S18 may be executed when the above limit is less than the threshold value.

With the above-described imaging routine, it is possible to detect an oil leak including its position.

The oil leak detection device 1 described above is used.
In the above, the case where one pair of the infrared camera device 3 and one pair of the CCD camera device 4 are provided is illustrated, but it is also possible to provide one or more pairs to expand the imaging region.

In the manual oil leak detection, the monitoring station 17 selects the infrared camera device 3 and the CCD camera device 4 at a specific position by the monitor, and the infrared camera device 3 and the CCD camera device 4 which have been selected have an imaging command. To monitor the sea area where the sea surface temperature is abnormal.

When the supervisor selects this manual monitoring, the automatic monitoring is automatically suspended. The manual monitoring is for the infrared camera devices 3 and C when it is necessary to promptly confirm when an abnormal state occurs at a specific position or around the specific site.
This is a very effective means when it is desired to confirm a wide range by the CD camera device 4.

In this case, the infrared camera devices 3 and C
On / off of the wiper of the CD camera device 4, control of the telephoto of the lens, focus, sensitivity, etc., control of pan / tilt, etc. may be performed manually.

[0069]

As described above, according to the oil leak detecting device of the present invention, the oil leak range can be determined at a remote place based on the image pickup signal output from the infrared camera device.
It is possible to obtain the effect that the position can be detected early, including the position.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an oil leak detection device according to an exemplary embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of an image processing unit in the oil leak detection apparatus of FIG.

FIG. 3 is a flowchart for explaining the operation of the oil leak detection device according to the exemplary embodiment of the present invention.

FIG. 4 is a flowchart for explaining the operation of the oil leak detection device according to the exemplary embodiment of the present invention.

[Explanation of symbols]

1 ... Oil leak detection device 3 ... Infrared camera device 4 ... CCD camera device 5 ... Infrared camera device Observation station 7 ... CCD camera device observation station 9 ... Observation station 11 ... Infrared imaging monitoring station 13 ... CCD imaging monitoring station 15 ... Temperature sensor 16 ... Wave height sensor 17 ... Monitoring station 31, 41 ... Electric swivel base 42 ... Search light 111 ... Image processing unit

Claims (5)

[Claims] 1. An observing means by an infrared camera device for scanning and imaging a predetermined imaging area of the sea surface, a wave digitizing means for obtaining a wave numerical value of the sea surface when the imaging area is imaged, and a time sequence. A difference calculation means for obtaining a density difference between pixels at positions corresponding to the image pickup area when the image pickup area is picked up by the infrared camera device; and a density difference obtained by the difference calculation means based on at least a wave numerical value. And a binarizing unit that binarizes the image capturing region where an output value of the binarizing unit that exceeds the threshold is generated as an oil leak region. 2. An observing means by an infrared camera device for scanning and imaging a predetermined imaging area of the sea surface, a wave numerical value calculating means for obtaining a wave numerical value of the sea surface when the imaging area is imaged, and a time sequence. A difference calculation means for obtaining a density difference between pixels at positions corresponding to the image pickup area when the image pickup area is picked up by the infrared camera device; and a density difference obtained by the difference calculation means based on at least a wave numerical value. Binarizing means for binarizing the sea surface temperature of the entire imaging region, and a difference obtained by the difference calculating means exceeding the first threshold. In the image pickup area, the image pickup area portion determined to have the sea surface temperature detected by the sea surface temperature detecting means exceeds a predetermined second threshold is an oil leak area. Oil leakage detecting apparatus comprising: the judging means judges that that, the. 3. The oil leakage detection device according to claim 1 or 2, wherein the first threshold is a threshold obtained by compensating a threshold based on a wave numerical value with a threshold calculated by a discriminant analysis method. apparatus. 4. The oil leakage detection device according to claim 1 or 2, wherein the digitization of the waves by the wave digitization means is determined on the basis of the wave shape when the sea surface is calm. . 5. The oil leak detection device according to claim 2, further comprising a temperature sensor for detecting a predetermined temperature of the sea surface in the image pickup region, and the image pickup obtained based on an image pickup output from the infrared camera device. An oil leak detection device, characterized in that the sea surface temperature of the entire region is compensated by the temperature detected by the temperature sensor to obtain a substantial sea surface temperature.