WO2016072582A1

WO2016072582A1 - Underwater multispectral image acquisition system using multi-wavelength light source

Info

Publication number: WO2016072582A1
Application number: PCT/KR2015/006769
Authority: WO
Inventors: 오상우; 이문진
Original assignee: 한국해양과학기술원
Priority date: 2014-11-04
Filing date: 2015-07-01
Publication date: 2016-05-12
Also published as: KR20160052137A

Abstract

The present invention relates to an underwater multispectral image acquisition system using a multi-wavelength light source, which can acquire a multispectral image using each of light sources having six spectrums so as to acquire an image of an underwater object in the deep sea and monitor the deep sea environment. The present invention comprises: a lighting unit which includes a plurality of light sources having different spectrums so as to irradiate light to an underwater object; an image photographing unit for photographing the underwater object irradiated by each light source of the light unit and outputting an image signal corresponding to each light source; and an image control unit for receiving the image signal and generating a multispectral image having different spectrums.

Description

Underwater Multispectral Image Acquisition System Using Multi-wavelength Light Source

The present invention relates to an underwater multispectral image acquisition system, and more particularly, multispectral in deep sea using each light source having six spectra to acquire images of underwater objects in deep sea and to monitor the deep sea environment. The present invention relates to an underwater multispectral image acquisition system using a multi-wavelength light source capable of acquiring an image.

In general, since sunlight cannot penetrate deeply under water, it is impossible to accurately determine an object because a deep-sea environment can secure a visual field only with myopia.

For this reason, the underwater lamps to monitor the deep sea environment, such as installation of the undersea production system, exploration of the undersea resources, installation of the undersea cable, lifting of the sinking ship, mapping of the undersea terrain, repair of the underwater structure, observation of the underwater ecology You can take underwater images using artificial light.

As artificial light, for example, an incandescent lamp or a high pressure sodium lamp (HPS) lamp is used, but has a disadvantage of low energy efficiency and high cost. Therefore, recently, lighting apparatuses using light emitting diodes (LEDs) have been used in various forms.

For example, Korean Patent Laid-Open Publication No. 10-2014-0085910 relates to a directional underwater LED lamp having a streamlined heat dissipation structure, which is capable of varying the irradiation angle illuminated according to the underwater environment and minimizing fluid resistance. Is starting.

On the other hand, in order to monitor the underwater environment, the color of the underwater light may be limited. For example, white-colored lighting can be applied to capture color photographs, and blue-colored lighting can be used to monitor a wide range of areas.

In particular, every object in the deep sea environment has its own special spectral fingerprint. Therefore, multispectral information is essential for detailed monitoring and analysis of objects in deep sea environments.

In general, white light and color cameras are used to acquire images of underwater objects in the deep sea.

To produce color photos, color cameras use only three colors (red (R), green (G), and blue (B)), but if you have important spectral information at wavelengths other than RGB, When using a combination of color cameras, there is a problem that it is impossible to analyze accurate information.

In addition, a hyperspectral camera may be used to acquire multispectral information on an object, but there is a disadvantage in that the cost is increased when the system is composed of these devices.

The present invention has been made to solve the above-mentioned problems, and for recognizing underwater multispectral image, each color LED having each wavelength is used as a light source covering a broad spectrum, and each color An object of the present invention is to provide an underwater multispectral image acquisition system using a multi-wavelength light source capable of acquiring an image using a monochrome charge coupled device (CCD) camera in order to evaluate the intensity of light.

However, the object of the present invention is not limited to the above-mentioned object, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, an underwater multispectral image acquisition system using a multi-wavelength light source according to an embodiment of the present invention, the illumination unit for irradiating light to an underwater object consisting of a plurality of light sources having a different spectrum (spectrum) and And an image capturing unit which photographs the underwater object irradiated by each light source of the lighting unit and outputs an image signal corresponding to each light source, and an image control unit which receives the image signal and generates a multispectral image having different spectra. Characterized in that the configuration.

In addition, the underwater multispectral image acquisition system using the multi-wavelength light source according to the present invention, the light source is characterized in that it comprises UV (ultra violet), blue, green, yellow, red and IR (infra-red).

In addition, the underwater multispectral image acquisition system using a multi-wavelength light source according to the present invention, the light source is characterized in that the light emitting diode (LED).

In the underwater multispectral image acquisition system using the multi-wavelength light source according to the present invention, the image control unit synchronizes the light emission time of the illumination unit and the imaging time of the image photographing unit.

In addition, the underwater multi-spectral image acquisition system using a multi-wavelength light source according to the present invention, the image capturing unit is characterized in that it comprises a monochromatic charge coupled device (CCD) camera.

According to the underwater multispectral image acquisition system of the present invention, as a light source, it has six different spectra by illuminating an underwater object with six colors of LEDs having different wavelengths and capturing it with a monochromatic CCD camera. A spectroscopic image can be generated, and through analysis and comparison of each image having a single spectrum, there is an effect of representing an unknown point in an image acquired by conventional illumination.

In addition, the underwater multi-spectral image acquisition system according to the present invention, the color image reproduced by the combination of six kinds of light source and monochromatic CCD camera can improve the expressive power than the image generated by the combination of the conventional white light and color camera There is an advantage.

1 is a configuration diagram schematically showing an underwater multispectral image acquisition system using a multi-wavelength light source according to an embodiment of the present invention.

2 is a graph showing the intensity of light according to the wavelength.

3 is an exemplary view comparing an image photographed using an underwater multispectral image acquisition system according to the present invention with an image photographed using a conventional technique.

Hereinafter, a detailed description of a preferred embodiment of the present invention will be described with reference to the accompanying drawings. In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted when it is deemed that they may unnecessarily obscure the subject matter of the present invention.

Embodiments according to the concept of the present invention may be variously modified and may have various forms, and specific embodiments will be illustrated in the drawings and described in detail in the present specification or application. However, this is not intended to limit the embodiments in accordance with the concept of the present invention to a particular disclosed form, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between. Other expressions describing the relationship between components, such as "between" and "immediately between," or "neighboring to," and "directly neighboring to" should be interpreted as well.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. As used herein, the terms "comprise" or "having" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof that is described, and that one or more other features or numbers are present. It should be understood that it does not exclude in advance the possibility of the presence or addition of steps, actions, components, parts or combinations thereof.

1 is a block diagram schematically illustrating an underwater multispectral image acquisition system using a multi-wavelength light source according to an embodiment of the present invention.

As shown in the figure, the underwater multispectral image acquisition system 1 using the multi-wavelength light source of the present invention may be configured to include an illumination unit 100, the image capturing unit 110 and the image control unit 120.

The lighting unit 100 may provide artificial light to monitor the deep sea environment or the underwater object 10 in the water, particularly in the deep sea where sunlight does not penetrate. The lighting unit 100 may be formed of a plurality of light emitting diodes (LEDs) as a light source.

In particular, in order to monitor and analyze the spectral fingerprint of the underwater object 10, the illumination unit 100 may include a light source having six different spectra.

For example, the lighting unit 100 may be a UV (ultra violet) LED 101, a blue LED 102, a green LED 103, a yellow LED 104, a red LED 105, and an IR-infrared LED. 106.

As shown in FIG. 2, the graph indicated by the dotted line shows the intensity of light according to the wavelength of each color in a combination of conventional white light and color cameras (eg, blue 20, green 30, red 40). The graph shown by the solid line shows the intensity according to the wavelength of UV 201, blue 202, green 203, yellow 104, red 105 and IR 206 of the multi-wavelength light source according to the present invention. Indicates.

As shown in the figure, in the present invention, there is a feature that can cover a broad spectrum of spectrum by using a multi-wavelength light source.

The image capturing unit 110 captures the underwater object 10 by using light emitted from the respective light sources constituting the lighting unit 100, that is, LEDs 101 to 106, and outputs an image signal corresponding to each light source. Can be.

The image capturing unit 110 may include a monochromatic charge coupled device (CCD) camera to evaluate the intensity of the light emitted from each of the LEDs 101 to 106 to the underwater object 10. have.

The image controller 120 may receive a plurality of image signals output through the image capturing unit 110 and generate a multispectral image having different spectra. For example, the image controller 120 may generate a color image using six image signals having different spectra.

In addition, the image controller 120 may synchronize the light emission time of the light emitted from the illumination unit 100 with the photographing time of photographing the underwater object 10 through the image photographing unit 110.

FIG. 3A illustrates an image photographed by a combination of a conventional white light and a color camera, and FIG. 3B illustrates an image photographed using an underwater multispectral image acquisition system according to the present invention.

The same object was photographed in order to evaluate the performance of the underwater multispectral image acquisition system 1 according to the present invention. In order to quantify the results of the comparison and analysis of images, a separate image analysis algorithm was used.

As shown in the figure, the image captured by the underwater multispectral image acquisition system 1 of the present invention was able to reveal the features that do not appear in the conventional color photograph, in the case of the image of FIG. Compared with the image of 3 (a) it can be seen that the expressive power is better.

Although the contents of the present invention have been described with reference to the embodiments shown in the drawings, these are merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. will be. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

The present invention can generate a multispectral image having six different spectra by illuminating a water object through a six-color LED having a different wavelength as a light source and capturing it with a monochromatic CCD camera. By analyzing and comparing each image having a single spectrum, it is possible to represent an unknown point in an image acquired by conventional illumination, and thus it can be applied to an underwater multispectral image acquisition system.

Claims

An illumination unit which consists of a plurality of light sources having different spectra, and irradiates light onto an underwater object;

An image capturing unit photographing the underwater object irradiated by each light source of the lighting unit and outputting an image signal corresponding to each light source; And

And an image controller configured to receive the image signal and generate a multispectral image having different spectrums.
The method of claim 1,

The light source is an underwater multispectral image acquisition system using a multi-wavelength light source, characterized in that UV (ultra violet), blue, green, yellow, red and IR (infra-red).
The method of claim 1,

The light source is an underwater multispectral image acquisition system using a multi-wavelength light source, characterized in that the light emitting diode (LED).
The method of claim 1,

And the image controller synchronizes the light emission time of the lighting unit and the image capturing time of the image capturing unit.
The method of claim 1,

The image capturing unit includes a monochromatic charge coupled device (CCD) camera.