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Synthetic aperture radar (SAR) image change detection difference chart generation method based on contourlet transform

A technology of image change detection and contourlet transform, applied in image enhancement, image analysis, image data processing and other directions, can solve the problems of high false detection rate, high missed detection rate, large total number of detection errors, etc., to improve detection accuracy , Analyze the effect of processing accuracy improvement

Inactive Publication Date: 2012-11-28
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the commonly used SAR image change detection difference map generation method, the logarithmic ratio method is not sensitive to the changed area, and the missed detection rate is high. The mean ratio method is easy to attribute the unchanged area to the changed area, and the false detection rate is high. The total number of detection errors is large

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  • Synthetic aperture radar (SAR) image change detection difference chart generation method based on contourlet transform
  • Synthetic aperture radar (SAR) image change detection difference chart generation method based on contourlet transform
  • Synthetic aperture radar (SAR) image change detection difference chart generation method based on contourlet transform

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Embodiment 1

[0038] The present invention is a SAR image change detection difference map generation method based on Contourlet transform, see figure 1 Firstly, the logarithmic ratio image and the mean ratio image are constructed for two preprocessed SAR images of the same region at different times, and then processed by Contourlet transform to generate the corresponding Contourlet coefficients, and then the two images are processed according to the fusion rules designed. The coefficients are divided into high-frequency and low-frequency calculations, and finally the inverse Contourlet transform is performed on the fused Contourlet coefficients to generate a difference map. The specific implementation steps for generating a difference map based on fused SAR image change detection include:

[0039] Step 1 Input two preprocessed SAR images X that have been filtered, denoised, radiometrically corrected and geometrically registered in the same area at different times A , X B .

[0040] Step 2...

Embodiment 2

[0050] The SAR image change detection difference map generation method based on Contourlet transform is the same as embodiment 1, referring to figure 1 , to realize the Contourlet transform of the present invention for SAR image change detection difference map, first input two preprocessed SAR images of the same region at different times, and construct a logarithmic ratio image and a mean ratio image respectively to the two images, and then use the Contourlet The transformation process makes it generate corresponding Contourlet coefficients, and then calculates the Contourlet coefficients of the two images in high and low frequencies according to the designed fusion rules, and finally performs inverse Contourlet transformation on the fused Contourlet coefficients to generate a difference map. The realization process of this invention is described in detail below by this example:

[0051] Step 1: Obtain two synthetic aperture radar (SAR) images at different times in the same ar...

Embodiment 3

[0075] The SAR image change detection difference map generation method based on Contourlet transform is the same as embodiment 1-2, with reference to figure 1 , adopt the present invention to obtain two synthetic aperture radar (SAR) images and reference figure to simulate at different times of the Bern region in this example, and the realization steps are as follows:

[0076] Step 1: Obtain two synthetic aperture radar (SAR) images at different times in the Bern area, filter and denoise the two SAR images, preprocess radiation correction and geometric registration, and the processed two images X A , X B , where the image X obtained after preprocessing A Such as figure 2 As shown in (a), the image X obtained after preprocessingB Such as figure 2 (b) shown.

[0077] Step 2 utilizes the preprocessed such as figure 2 Image X shown in (a) A and figure 2 Image X shown in (b) B , using the logarithmic ratio operation to construct such as image 3 (a) shows the log odds ...

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Abstract

The invention discloses a synthetic aperture radar (SAR) image change detection difference chart generation method based on contourlet transform. A realization process mainly comprises the following steps of: firstly, constructing a logarithmic ratio image and a mean ratio image on two SAR images which are preprocessed and obtained at different time and in a same region; generating corresponding Contourlet coefficients by Contourlet transform processing; respectively calculating the coefficients of the two images in a high-frequency mode and a low-frequency mode according to different fusion rules; performing inverse Contourlet transform on the fused Contourlet coefficients to generate a change difference chart. The different characteristics of high frequency and low frequency are respectively extracted by the mean ratio image and the logarithmic ratio image, and complementation information of the source images is fully utilized by the image fusion based on the Contourlet transform, so that the SAR image change detection can have a better result, the detection error ratio is low, the image noise is inhibited, and the analysis precision is improved. Compared with other difference chart generation methods, the method disclosed by the invention is high in noise inhibition and good in edge maintenance, and can reserve change information to the maximum extent.

Description

technical field [0001] The invention belongs to the technical field of SAR image change detection, and mainly relates to a difference map generation stage in the SAR image change detection. Specifically, it is a SAR image change detection difference map generation method based on contourlet (Contourlet) transformation. For SAR image change detection. Background technique [0002] Remote sensing image change detection refers to the comparison and analysis of remote sensing images of the same area in different periods, and the change information is obtained according to the differences between the images. Compared with visible light and infrared remote sensing, the SAR system has the ability to acquire data all-weather and all-weather, and has a certain penetration ability to ground objects, so SAR image change detection technology is widely used in various fields, such as environmental monitoring, land Aspects such as utilization / coverage, agricultural surveys, urban change...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/50G06T7/00
Inventor 公茂果焦李成陈默马晶晶李瑜贾萌翟路王爽王桂婷马文萍
Owner XIDIAN UNIV
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