结合空时上下文信息的视频SAR图像相干斑滤波

doi:10.12305/j.issn.1001-506X.2024.02.09

Abstract

Abstract:

As a new system of synthetic aperture radar (SAR), VideoSAR can continuously image the scene, and has unique advantages in target detection, tracking and other application scenarios. However, the existence of speckle affects the quality of VideoSAR image and subsequent application of target detection. To solve this problem, a VideoSAR speckle filtering method combined with space-time context information is proposed. The method mainly contains three steps. Firstly, space-time context covariance matrices which can characterize the range-azimuth-time three-dimensional dynamic scattering information of VideoSAR image pixels are constructed. Secondly, the similarity samples of considered pixels are selected within a certain neighborhood according to the similarity test of context covariance matrix. Finally, speckle filtering is realized by averaging the similar samples. Based on two groups of measured VideoSAR data, speckle filtering comparison experiments are carried out to verify the effectiveness and advantages of the proposed method. It is proved the proposed method is effective in suppressing speckle while preserving further target's detailed information.

Key words: VideoSAR, speckle filtering, space-time context information, space-time context covariance matrix

CLC Number:

TN95

Shenwen LIU, Xingchao CUI, Siwei CHEN. VideoSAR image speckle filtering with space-time context information[J]. Systems Engineering and Electronics, 2024, 46(2): 446-458.

Figures/Tables 17

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滤波方法	评价指标
	ENL		TCR/dB		FOM
	ROI1	ROI2	ROI3	ROI4	ROI5	ROI6
原图	99.66	101.8	15.95	23.4	0.25	0.15
均值滤波	191.3	393.13	13.87	21.06	0.69	0.63
Improved Sigma	268.88	761	14.38	23.05	0.18	0.34
SAR-BM3D	188.25	459.02	15.62	23.27	0.57	0.51
V-BM3D	258.37	652.88	15.57	23.27	0.70	0.68
3D-CCM	372.2	833.77	14.86	23.32	0.63	0.60

滤波方法	评价指标
	ENL		TCR/dB		FOM
	ROI1	ROI2	ROI3	ROI4	ROI5	ROI6
原图	162.38	131.35	30.04	27.87	0.31	0.43
均值滤波	307.39	242.54	21.48	19.56	0.45	0.48
improved Sigma	396.8	318.61	26.38	22.07	0.23	0.12
SAR-BM3D	327.98	267.76	27.86	25.28	0.43	0.63
V-BM3D	410.80	297.86	27.91	25.35	0.57	0.67
3D-CCM	494.80	361.49	28.74	26.00	0.45	0.63

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VideoSAR image speckle filtering with space-time context information

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