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Method for detecting change of water body and settlement place based on aviation video

An aerial image and change detection technology, which is applied in the fields of image processing, aerial image processing and target extraction, and can solve problems such as inability to adapt to production needs.

Inactive Publication Date: 2008-05-07
WUHAN UNIV
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Problems solved by technology

First, this type of extraction method requires manual selection of a large number of training samples; second, in the extraction of the target, it is necessary to manually give the extraction threshold
Therefore, the update of large-scale massive data requires a lot of manual intervention, which cannot meet production needs

Method used

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  • Method for detecting change of water body and settlement place based on aviation video
  • Method for detecting change of water body and settlement place based on aviation video
  • Method for detecting change of water body and settlement place based on aviation video

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Embodiment Construction

[0060] This embodiment mainly extracts residential areas by processing rasterized old vector data and preprocessed aerial images, thereby extracting water systems, and finally the results of residential area extraction and water body extraction are superimposed on the corresponding old vector data to obtain the change area and change types to implement change detection. The process is shown in Figure 1.

[0061] In this embodiment, the aerial image (1133×1079) of Wuhan area is selected as shown in Figure 2 and the aerial image of Beijing area (2049×1565) is shown in Figure 9, and two groups of experiments are carried out for different situations. The specific implementation steps are as follows:

[0062] (1) Input the aerial images of Wuhan area and Beijing area respectively, and preprocess the aerial images:

[0063] (a) orthorectification of aerial images;

[0064] (b) Stitching of orthophotos;

[0065] (c) According to the range of the old vector data in the same area, t...

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Abstract

The invention discloses a detection method based on aerial images for ascertaining the changes in water bodies and inhabited places, which comprises the following steps: (1) pre-processing recent aerial images, (2) converting the old vector data into raster grids, (3) generating pyramid images of the same level respectively by images and the grid vector data, (4) calculating the characteristics of image edges and the characteristics of LAW energy, (5) by means of existing old vector data, acquiring the training samples of inhabited places on the aerial images, obtaining the characteristic value of the inhabited places, determining the threshold value according to the characteristic value and extracting the populated places on the aerial images, (6) by use of the existing vector data, acquiring the training samples of water systems of aerial images, and by on basis of the extracted populated places, acquiring the characteristic value of the water systems, determining the threshold value according to the characteristic value, and extracting the water systems on the aerial images, (7) pyramid re-establishing, namely, reducing the extracted results into original definition, and (8) superposing the extracted results with the old vector data to acquire the changing areas and changing types, which are prompted to the users. The invention has the advantages of effectively utilizing the old vector data, quickly detecting the changing areas, and reducing the workload of updating maps by means of aerial images.

Description

technical field [0001] The invention relates to a method for detecting changes in water bodies and residential areas based on aerial images, which belongs to the field of image processing, in particular to the technical field of aerial image processing and target extraction. Background technique [0002] Changes in nature and human activities alter the landscape and land use patterns. Timely and effective monitoring of changing areas and types is the basic work of urban change detection and automatic map repair. Modern earth observation technology has entered a stage where various earth observation data can be provided in a timely and rapid manner. The use of recent aerial images to achieve rapid data updates has become an important means of map revision and surveying. Automatically, efficiently, and accurately extracting water bodies and residential areas from recent aerial images in a certain area and identifying their changing areas and types can greatly reduce the manu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06K9/46G06K9/62
Inventor 潘励郑宏王华刘朋飞
Owner WUHAN UNIV
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