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Remote sensing image change detection method based on Treelet and direction adaptive filtering

An adaptive filtering and remote sensing image technology, applied in the field of image processing, can solve the problems of reducing the accuracy of change detection, missing information in the change detection results, and unable to keep the edge information of the change area well, so as to improve the accuracy of change detection, Overcome the effect of missed information

Inactive Publication Date: 2012-09-12
XIDIAN UNIV
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Problems solved by technology

Although this method can reduce the impact of radiation correction and uneven illumination on the change detection results, it still has the disadvantage that the Treelets filtering makes the change detection results have more missing information, which cannot keep the edge information of the change area well, and reduces the Change Detection Accuracy

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  • Remote sensing image change detection method based on Treelet and direction adaptive filtering
  • Remote sensing image change detection method based on Treelet and direction adaptive filtering
  • Remote sensing image change detection method based on Treelet and direction adaptive filtering

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Embodiment Construction

[0040] Attached below figure 1 The steps of the present invention are further described in detail.

[0041] Step 1, read in two remote sensing images of the same size acquired at different times in the same area.

[0042] Step 2, Construct difference image.

[0043] Subtract any remote sensing image in step 1 from another remote sensing image, and take the absolute value of the result of the subtraction to obtain a difference image.

[0044] Step 3, direction adaptive filtering.

[0045] Select a square neighborhood image block: randomly select a pixel point in the difference image, and its spatial position is recorded as (m, n), take this pixel point as the center, and take a fixed length Nu as the side length to determine a square neighborhood image block , wherein, in the embodiment of the present invention, the fixed length Nu is 5 pixels.

[0046] Refer to attached figure 2 , to perform direction template division on square neighborhood image blocks. attached fig...

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Abstract

The present invention discloses a remote sensing image change detection method based on Treelet and direction adaptive filtering, which comprises the following realizing steps of: (1) reading in data; (2) constructing a difference image; (3) direction adaptive filtering; (4) fusion of Treelets; (5) adaptive threshold value classification; and (6) post-processing. With the remote sensing image change detection method based on Treelet and direction adaptive filtering, marginal information of changing areas can be better kept and residual information of change detection results can be reduced as well. The method, having sound change detection accuracy, can be applied to fields such as dynamic monitoring of water levels of lakes, crop growth situation, urban planning, and military reconnaissance.

Description

technical field [0001] The invention belongs to the technical field of image processing, and further relates to a remote sensing image change detection method based on Treelet and direction adaptive filtering. The method can be applied to dynamic monitoring of lake water level, dynamic monitoring of crop growth status, urban planning, military reconnaissance and other fields. Background technique [0002] Change detection is to detect the change information of the ground objects in the area over time by analyzing multiple remote sensing images in the same area at different times. With the development of remote sensing technology and information technology, multi-temporal remote sensing image change detection has become an important direction of current remote sensing image analysis research. [0003] In the research of multi-temporal remote sensing image change detection methods, a common change detection method is to compare first and then classify. Its advantage is that ...

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Application Information

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IPC IPC(8): G06T7/00
Inventor 王桂婷焦李成万义萍公茂果钟桦张小华田小林侯彪王爽
Owner XIDIAN UNIV
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