基于非凸加权范数约束的SAR图像降斑

doi:10.3969/j.issn.1001-506X.2020.04.11

Abstract

Abstract:

The non-convex weighted norm constrained (NWNC) synthetic aperture radar (SAR) image despeckling method is proposed based on the low rank property of similar image patch sets. Firstly, some similar image patches are searched for each target patch to construct a set of similar image patches. Secondly, NWNC is applied to the coefficient matrix. Then the coefficient matrix is estimated by generalized threshold shrinkage. Finally, the despeckled image is reconstructed by the inverse transformation of the coefficient matrix. The experimental results show that NWNC not only effectively solves the problem of insufficient constraints of traditional low-rank kernel norms, but also makes the coefficients estimation more accurate through NWNC and generalized threshold shrinkage, which can suppress speckle noise and protect the texture details of the image well.

Key words: synthetic aperture radar (SAR) image despeckling, low-rank, non-convex weighted norm constrain (NWNC), generalized threshold shrinkage

CLC Number:

TP751

Shujun LIU, Jian SONG, Xiaodong SHEN, Jianxin CAO. SAR image despeckling based on non-convex weighted norm constraint[J]. Systems Engineering and Electronics, 2020, 42(4): 813-818.

Figures/Tables 12

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References 16

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方法	数值
方法	L=1	L=2	L=4	L=16
Noise	11.31	14.11	17.02	23.00
Gamma-MAP	20.82	23.55	25.28	27.98
SAR-BM3D	27.33	29.29	31.26	34.42
PPB	25.39	27.88	30.06	33.28
NNC	26.19	26.63	30.04	34.08
NWNC	27.42	29.91	31.92	35.04

方法	数值
方法	L=1	L=2	L=4	L=16
Noise	12.11	14.87	17.79	23.77
Gamma-MAP	21.77	24.68	26.51	29.95
SAR-BM3D	27.93	29.62	31.21	34.15
PPB	26.75	28.41	29.85	32.78
NNC	26.61	26.78	30.21	34.03
NWNC	27.71	29.73	31.62	34.80

	Reg.1	Reg.2	Reg.3
Noise	12.51	19.01	19.99
Gamma-MAP	216.79	272.3	431.7
SAR-BM3D	138.0	347.1	441.7
PPB	1 875	712.5	2 825
NNC	1 292	538.0	4 743
NWNC	4 507	592.0	6 883

	Fig. 4	Fig. 5	Fig. 6
Noise	1	1	1
Gamma-MAP	0.162 9	0.32	0.152 2
SAR-BM3D	0.465 1	0.56	0.354 7
PPB	0.277 0	0.45	0.299 9
NNC	0.381 2	0.38	0.253 4
NWNC	0.375 4	0.53	0.312 8

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SAR image despeckling based on non-convex weighted norm constraint

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