Zhaoyang Mao, Lan Li, Wei Wei. Optimization Method for Sensing Matrix Based on Transfer Learning[J]. Laser & Optoelectronics Progress, 2021, 58(14): 1410021
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Fig. 3. Reconstructed images at different sampling rates. (a) Original image; (b) sampling rate is 0.3; (c) sampling rate is 0.4; (d) sampling rate is 0.5
Algorithm 1:transfer learning optimization of the sparse base
Input:signal x,wavelet basic Ψ0,sparse matrix Ψ(0),maximum number of iterations Imax,soft threshold parameters λfor z=1∶Imaxcalculating sparsity coefficient s(z) by Eq. (12)singular value decomposition of s(z)xT+βΨ0 is performed to obtain UΣVTupdate Ψ(z)by Eq. (17)end forOutput:Ψ=Ψ(z)
Table 1. Transfer learning optimization of the sparse base
Algorithm 2: construction of measurement matrix Φ
Input: measurement matrix Φ, sparse matrix Ψ, iterative threshold εInitialization: Gaussian random matrix Φ, A=ΦΨwhile halting criterion false doG=,eigenvalue decomposition G=VHVT←diag==VVTε0= sum of non-diagonal elements if do=Ψ-1 return Φ←Output: measurement matrix Φ
Table 2. Process of constructing measurement matrix
Method
Sampling rate
Barbara
Boats
House
Lena
Peppers
Average
Gaussian
0.2
5.963
4.325
4.242
3.904
4.720
4.630
0.4
22.666
21.972
24.398
25.243
23.405
23.536
0.6
27.669
25.889
29.622
30.254
28.283
28.343
EIG
0.2
6.422
4.051
4.447
3.926
4.319
4.633
0.4
23.420
22.167
25.384
25.358
23.735
24.012
0.6
29.378
27.508
31.941
31.966
30.269
30.212
Elad
0.2
5.284
4.987
3.035
4.245
5.438
4.597
0.4
22.065
22.065
25.824
25.816
23.479
23.849
0.6
29.378
27.322
31.412
31.966
29.826
29.980
Ours
0.2
7.325
5.424
4.700
4.757
4.650
5.371
0.4
23.111
22.317
25.271
25.858
23.715
24.054
0.6
29.695
27.629
31.974
32.044
30.387
30.346
Table 3. PSNR of images reconstructed by 4 methods unit: dB
Zhaoyang Mao, Lan Li, Wei Wei. Optimization Method for Sensing Matrix Based on Transfer Learning[J]. Laser & Optoelectronics Progress, 2021, 58(14): 1410021