TOP > 外国特許検索 > Image processing device, method for image processing, and image processing program

Image processing device, method for image processing, and image processing program NEW

外国特許コード F190009672
整理番号 B000026AU
掲載日 2019年1月22日
出願国 オーストラリア
出願番号 2014227060
公報番号 2014227060
出願日 平成26年2月28日(2014.2.28)
公報発行日 平成27年9月24日(2015.9.24)
国際出願番号 JP2014055165
国際公開番号 WO2014136694
国際出願日 平成26年2月28日(2014.2.28)
国際公開日 平成26年9月12日(2014.9.12)
優先権データ
  • 特願2013-044907 (2013.3.7) JP
  • 2014JP55165 (2014.2.28) WO
発明の名称 (英語) Image processing device, method for image processing, and image processing program NEW
発明の概要(英語) [Problem] To provide an image processing device whereby it is possible to efficiently select among line filters and matrix filters which are suited to noise reduction in DEM data.
[Solution] An image processing device (1) comprises: an acquisition unit (41) which acquires DEM data which denotes respective digital elevations of latticework areas in a prescribed map region; a selection unit (43) which selects a plurality of line filters which carry out filtering of data which is contiguous in one direction in the map region and/or a plurality of matrix filters which carry out filtering of data which configures a two-dimensional region in the map region; a filter processing unit (46) which carries out, by the filter which is selected by the selection unit (43), a filter process of the DEM data which is acquired by the acquisition unit (41); and an output unit (47) which outputs the DEM data whereupon the filter process is carried out.
従来技術、競合技術の概要(英語) BACKGROUND OF THE INVENTION
Conventionally, Digital Elevation Model (DEM) data indicating digital elevation of each lattice-shaped region in a predetermined map region generated by using stereo pair images obtained from an aircraft, a satellite, and the like by using a remote sensing technology is provided.For example, DEM data generated from the Shuttle Radar Topography Mission (SRTM) and DEM data generated from the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) are known.
Recently, topographical analyses are conducted by computers using these pieces of DEM data, and for example, an analysis of the geological structure based on a slope gradation map generated by using these pieces of DEM data has been proposed.
However, the DEM data generated by using the remote sensing technology contains noise components due to a fluctuation of an orbit of a satellite and lack of accuracy of stereo pair images.Further, when stereo pair images for generating the DEM data are acquired on different dates and times, atmospheric influences and the like cause differences between these images and noise components are contained therein.These noise components cause errors in the digital elevation at each point contained in the DEM data, and lead to a decrease in the accuracy of the analysis of the geological structure.
In Non-Patent Document 1, the inventors of the present invention proposed a method for removing noise components in SRTM DEM by conducting a process with a matrix filter for smoothing elevation data that constitutes a two-dimensional region in a map region by using the weighted moving average method or conducting a process with a line filter that filters data which is continuous in one direction in a map region.PRIOR ART NON-PATENT DOCUMENT
Non-Patent Document 1: Makoto INOUE, Taro YAJIMA, "The filter effect on SRTM90mDEM ―Advantages and Disadvantages-," The Mining and Materials Processing Institute of Japan, Journal of the Spring Conference, 2011, (I) Resources, Al2-1
特許請求の範囲(英語) [claim1]
1. An image processing device comprising: an acquiring section that acquires DEM data indicating digital elevation of each lattice-shaped area in a predetermined map region; a selecting section that selects at least one of a plurality of line filters that filters data which is continuous in one direction in the map region and a plurality of matrix filters that filters data constituting a two-dimensional region in the map region; a filter processing section that conducts filter processing of the DEM data acquired by the acquiring section by a filter selected by the selecting section; and an outputting section that outputs the DEM data after being filtered in the filter processing.
[claim2]
2. An image processing device according to Claim 1, further comprising: a smoothing processing section that smooths data of a maximum value in a predetermined window width in the DEM data acquired by the acquiring section, wherein the filter processing section conducts filter processing of the DEM data smoothed by using the filter selected by the selecting section.
[claim3]
3. An image processing device according to Claim 1 or 2, further comprising: a trend calculating section that calculates a trend of terrain in the predetermined map region indicated by the DEM data acquired by the acquiring section, wherein the selecting section selects at least one of the plurality of line filters and the plurality of matrix filters on the basis of the calculated trend of terrain.
[claim4]
4. An image processing device according to Claim 3, wherein the trend calculating section divides the predetermined map region into a plurality of regions and calculates the trend of terrain for each of the plurality of divided regions, wherein the selecting section selects at least one of the plurality of line filters and the plurality of matrix filters on the basis of the calculated trend of terrain for each of the plurality of regions.
[claim5]
5. An image processing device according to Claim 2, further comprising: a trend calculating section that calculates a trend of terrain in the predetermined map region indicated by the DEM data acquired by the acquiring section, wherein the smoothing processing section determines the window width on the basis of the calculated trend of terrain.
[claim6]
6. An image processing device according to Claim 5, wherein the smoothing processing section determines the number of times the smoothing is conducted on the basis of the calculated trend of terrain.
[claim7]
7. An image processing device according to any one of Claims 2, 5 and 6, wherein the smoothing processing section smooths in one direction in the predetermined map region indicated by the DEM data as well as in a direction orthogonal to the one direction, and calculates an average of results of each smoothing.
[claim8]
8. An image processing device according to any one of Claims 2, 5, 6 and 7, further comprising: a storage section that stores a position of the predetermined map region indicated by DEM data and the number of pieces of satellite image data used for generating the DEM data at the position, wherein the smoothing processing section specifies the number of pieces of the satellite image data used for generating the DEM data acquired by the acquiring section by referring to the storage section, and determines the number of times smoothing is performed on the basis of the specified number of pieces of satellite image data.
[claim9]
9. An image processing device according to any one of Claims 1 to 8, wherein the outputting section generates a file with a file name made by appending identification information of the filter selected by the selecting section to a file name of a file that stores the DEM data before the filter processing, and outputs the DEM data after being filtered in the filter processing to the file.
[claim10]
10. An image processing method comprising: acquiring DEM data indicating digital elevation of each lattice-shaped area in a predetermined map region; selecting at least one of a plurality of line filters that filters data which is continuous in one direction in the map region and a plurality of matrix filters that filters data consisting a two-dimensional region in the map region; conducting filter processing of the DEM data acquired by the acquiring by a filter selected by the selecting; and outputting the DEM data after being filtered in the filter processing.
[claim11]
11. An image processing method according to Claim 10, further comprising: calculating a trend of terrain in the predetermined map region indicated by the DEM, and smoothing data constituting the DEM data, wherein the selecting selects at least one filter from the plurality of line filters and the plurality of matrix filters on the basis of the trend of terrain, and the conducting filter processing conducts filter processing of the DEM data smoothed.
[claim12]
12. An image processing program that causes a computer to execute: acquiring DEM data indicating digital elevation of each lattice-shaped region in a predetermined map region, selecting at least one of a plurality of line filters that filters data which is continuous in one direction in the map region and a plurality of matrix filters that filters data consisting a two-dimensional region in the map region, conducting filter processing of the DEM data acquired by the acquiring by a filter selected by the selecting, and outputting the DEM data after being filtered in the filter processing.
  • 出願人(英語)
  • Japan Oil, Gas and Metals National Corporation
  • 発明者(英語)
  • Inoue, Makoto
  • Yajima, Taro
国際特許分類(IPC)

PAGE TOP

close
close
close
close
close
close