Apparatus and method for detecting oil spill by using satellite image

Patent metadata

Field	Value
Publication number	US-11244461-B2
Application number	US-201816223742-A
Country	US
Kind code	B2
Filing date	Dec 18, 2018
Priority date	Jun 30, 2016
Publication date	Feb 8, 2022
Grant date	Feb 8, 2022

Abstract

The present invention relates to an apparatus and method for detecting an oil spill by using a satellite image, an apparatus for detecting an oil spill by using a satellite image, the apparatus including: a satellite image reception unit configured to receive a satellite image of a predicted oil spill area; a satellite image correction unit configured to correct the satellite image by compensating for the influences of the atmosphere and waves; a spectral angle mapper image generation unit configured to generate a spectral angle mapper image; a spectral vector distance image generation unit configured to generate a spectral vector distance image; and an oil spill area detection unit configured to derive the range of the oil spill area by combining the spectral angle mapper image and the spectral vector distance image together.

First claim

What is claimed is:

1. An apparatus for detecting an oil spill by using a satellite image, the apparatus comprising:
a satellite image reception unit configured to receive a satellite image of a predicted oil spill area in an ocean;
a satellite image correction unit configured to correct the satellite image by compensating for influences of an atmosphere and waves in the predicted oil spill area;
a spectral angle mapper image generation unit configured to convert the corrected satellite image into a color channel image, and to generate a spectral angle mapper image representative of a spectral angle distance between a first direction vector for reflectance values of visible and near-infrared channel images in at least one arbitrary pixel of the oil spill area in the color channel image and a second direction vector for reflectance values of visible and near-infrared channel images in at least one arbitrary pixel in an area other than the oil spill area;
a spectral vector distance image generation unit configured to convert the corrected satellite image into a color channel image, and to generate a spectral vector distance image representative of a spectral vector distance between a first direction vector for reflectance values of visible and near-infrared channel images in at least one arbitrary pixel of the oil spill area in the color channel image and a second direction vector for reflectance values of visible and near-infrared channel images in at least one arbitrary pixel in an area other than the oil spill area; and
an oil spill area detection unit configured to derive a range of the oil spill area by combining information of the spectral angle mapper image and information of the spectral vector distance image with each other.

2. The apparatus of claim 1 , wherein the satellite image reception unit is a satellite image reception unit configured to receive a 4 m or lower resolution optical image.

3. The apparatus of claim 1 , wherein the satellite image correction unit comprises an atmospheric influence compensation unit configured to compensate for the influence of the atmosphere in the satellite image by using an atmospheric correction technique or image-based correction technique.

4. The apparatus of claim 1 , wherein the satellite image correction unit comprises a wave influence compensation unit configured to compensate for the influence of the waves in the satellite image by using a directional filter in which a lateral window of the satellite image is larger than a vertical window thereof or a vertical window of the satellite image is larger than a lateral window thereof.

5. The apparatus of claim 4 , wherein the directional filter is a median value filter configured to replace a wavelength value of one arbitrary point of the satellite image with a median value of a window centered on the point and to represent the median value.

6. The apparatus of claim 1 , wherein each of the spectral angle mapper image generation unit and the spectral vector distance image generation unit calculates average values of the reflectance values of the visible and near-infrared channel images in at least two pixels of the oil spill area in the color channel image, and generates a first direction vector for changes in the average values.

7. The apparatus of claim 1 , further comprising an oil spill area selection unit configured to receive an arbitrary range of the oil spill area in the corrected satellite image.

8. A method of detecting an oil spill by using a satellite image, the method comprising:
a satellite image reception step of receiving a satellite image of a predicted oil spill area in an ocean;
a satellite image correction step of correcting the satellite image by compensating for influences of an atmosphere and waves in the predicted oil spill area;
a spectral angle mapper image generation step of converting the corrected satellite image into a color channel image, and generating a spectral angle mapper image representative of a spectral angle distance between a first direction vector for reflectance values of visible and near-infrared channel images in at least one arbitrary pixel of the oil spill area in the color channel image and a second direction vector for reflectance values of visible and near-infrared channel images in at least one arbitrary pixel in an area other than the oil spill area;
a spectral vector distance image generation step of converting the corrected satellite image into a color channel image, and generating a spectral vector distance image representative of a spectral vector distance between a first direction vector for reflectance values of visible and near-infrared channel images in at least one arbitrary pixel of the oil spill area in the color channel image and a second direction vector for reflectance values of visible and near-infrared channel images in at least one arbitrary pixel in an area other than the oil spill area; and
an oil spill area detection step of deriving a range of the oil spill area by combining information of the spectral angle mapper image and information of the spectral vector distance image with each other.

9. A computer-readable storage medium having stored thereon a program for executing the method of claim 8 .

Assignees

• Univ Seoul Ind Coop Found
• Univ Of Seoul Ind Cooperation Foundation

Inventors

• Jung Hyung Sup
• Park Sung Hwan
• Chae Sung Ho

Classifications

• G06T7/90

  Determination of colour characteristics · CPC title

• G06T2207/20032

  Median filtering · CPC title

• G06T7/11

  Region-based segmentation · CPC title

• G01V8/00 Primary

  Prospecting or detecting by optical means · CPC title

• G01S19/14

  specially adapted for specific applications · CPC title