Author Affiliations
1 School of Big Data, North University of China, Taiyuan, Shanxi 0 30051, China2 Jiuquan Satellite Launch Center, Jiuquan, Gansu 735000, Chinashow less
Fig. 1. Structure of residual block
Fig. 2. Framework of method
Fig. 3. Network structure of generative model
Fig. 4. Network structure of discriminative model
Fig. 5. Pre-selection maps of label images. (a) Longwave infrared; (b) shortwave infrared; (c) visible light; (d) LP; (e) DWT; (f) NSCT; (g) NSST
Fig. 6. Effect of learning rate on generator loss
Fig. 7. Effect of learning rate on discriminator loss
Fig. 8. Effect of different λ on image quality. (a) λ=0; (b) λ=0.01; (c) λ=0.1; (d) λ=1
Fig. 9. Effect of different λ on generator loss
Fig. 10. Effect of λ on objective evaluation index of fused image. (a) The first set of fused images; (b) the second set of fused images; (c) the third set of fused images
Fig. 11. Image fusion results. (a) Longwave infrared; (b) shortwave infrared; (c) visible light; (d) DTCWT_SR; (e) NSST_NSCT; (f) CNN; (g) CSR; (h) proposed method
Layer | Filter size /step | Output size |
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Conv1 | 3×3 /1 | 128×128×64 | Res(7 units) | 3×3 /1 | 128×128×64 | | 3×3 /1 | 128×128×64 | Conv9 | 3×3 /1 | 128×128×256 | Conv10 | 3×3 /1 | 128×128×1 |
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Table 1. Parameters of generator
Layer | Filter size/step | Output size |
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Conv1 | 3×3 /1 | 128×128×64 | Conv2 | 3×3 /2 | 64×64×128 | Conv3 | 3×3 /2 | 32×32×256 | Conv4 | 3×3 /2 | 16×16×512 | Conv5 | 3×3 /1 | 16×16×256 | Conv6 | 1×1 /1 | 16×16×128 | Res | 1×1 /1 | 16×16×64 | | 3×3 /1 | 16×16×64 | | 3×3 /1 | 16×16×128 | Fc | - | 1 |
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Table 2. Parameters of discriminator
Fusion method | SD | AG | Con | CC | IE | MI | VIFF |
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LP | 49.019 | 4.211 | 40.812 | 0.424 | 7.223 | 5.608 | 0.466 | DWT | 44.772 | 3.826 | 36.650 | 0.342 | 7.175 | 5.415 | 0.442 | NSCT | 41.123 | 4.061 | 34.816 | 0.437 | 6.953 | 5.222 | 0.469 | NSST | 40.904 | 4.149 | 34.902 | 0.441 | 6.932 | 5.201 | 0.467 |
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Table 3. Label image selection table
Image | Fusion method | SD | AG | Con | CC | IE | MI | VIFF |
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No. 1 | DTCWT_SR | 35.471 | 3.150 | 23.916 | 0.409 | 6.968 | 4.869 | 0.505 | NSCT_NSST | 19.621 | 3.163 | 11.911 | 0.406 | 6.147 | 2.853 | 0.522 | CNN | 34.928 | 2.885 | 23.254 | 0.408 | 6.961 | 4.610 | 0.363 | CSR | 12.081 | 1.953 | 7.570 | 0.418 | 5.534 | 2.663 | 0.359 | Proposed method | 38.011 | 8.129 | 27.793 | 0.431 | 6.977 | 2.552 | 0.301 | No. 2 | DTCWT_SR | 26.274 | 7.245 | 25.927 | 0.143 | 5.984 | 1.492 | 0.367 | NSCT_NSST | 23.268 | 7.270 | 14.815 | 0.306 | 6.026 | 1.542 | 0.376 | CNN | 29.696 | 4.985 | 22.754 | 0.016 | 2.373 | 1.312 | 0.211 | CSR | 25.271 | 5.543 | 15.989 | 0.322 | 6.032 | 2.540 | 0.322 | Proposed method | 25.527 | 4.374 | 13.731 | 0.381 | 6.057 | 2.567 | 0.461 | No. 3 | DTCWT_SR | 21.854 | 5.187 | 15.038 | 0.427 | 6.475 | 1.256 | 0.415 | NSCT_NSST | 22.692 | 5.370 | 15.7166 | 0.471 | 6.806 | 1.542 | 0.419 | CNN | 38.590 | 4.961 | 25.609 | 0.441 | 6.910 | 2.799 | 0.392 | CSR | 23.054 | 3.868 | 15.726 | 0.499 | 6.450 | 2.391 | 0.382 | Proposed method | 41.089 | 4.310 | 30.929 | 0.593 | 6.938 | 3.093 | 0.420 | No. 4 | DTCWT_SR | 47.492 | 3.545 | 23.176 | 0.422 | 6.315 | 2.773 | 0.298 | NSCT_NSST | 35.373 | 3.605 | 15.136 | 0.445 | 6.831 | 2.531 | 0.317 | CNN | 54.597 | 3.163 | 29.778 | 0.436 | 6.283 | 2.862 | 0.351 | CSR | 38.587 | 2.217 | 17.656 | 0.452 | 6.796 | 3.331 | 0.375 | Proposed method | 32.400 | 8.452 | 22.767 | 0.457 | 6.938 | 2.055 | 0.384 | No. 5 | DTCWT_SR | 40.006 | 5.058 | 32.554 | 0.025 | 7.308 | 2.976 | 0.407 | NSCT_NSST | 24.886 | 5.147 | 18.059 | 0.489 | 6.615 | 1.812 | 0.428 | CNN | 40.559 | 3.951 | 34.331 | 0.271 | 7.316 | 2.133 | 0.346 | CSR | 26.239 | 2.526 | 20.707 | 0.515 | 6.642 | 3.007 | 0.277 | Proposed method | 40.677 | 5.974 | 33.890 | 0.569 | 7.321 | 2.106 | 0.473 | No. 6 | DTCWT_SR | 54.458 | 3.038 | 44.020 | 0.042 | 7.744 | 2.986 | 0.524 | NSCT_NSST | 25.990 | 3.047 | 18.728 | 0.455 | 6.686 | 2.254 | 0.552 | CNN | 45.549 | 2.538 | 35.269 | 0.193 | 7.333 | 1.839 | 0.208 | CSR | 28.803 | 1.523 | 21.125 | 0.429 | 6.691 | 2.858 | 0.160 | Proposed method | 46.425 | 5.643 | 36.462 | 0.476 | 7.453 | 2.993 | 0.648 | No. 7 | DTCWT_SR | 54.848 | 3.555 | 36.984 | 0.044 | 7.420 | 3.485 | 0.484 | NSCT_NSST | 27.527 | 3.550 | 21.490 | 0.460 | 6.813 | 1.807 | 0.504 | CNN | 45.880 | 2.945 | 37.129 | 0.334 | 7.104 | 2.627 | 0.440 | CSR | 27.853 | 1.834 | 21.168 | 0.472 | 6.701 | 2.968 | 0.326 | Proposed method | 47.024 | 4.259 | 37.523 | 0.500 | 7.487 | 2.461 | 0.606 | No. 8 | DTCWT_SR | 55.890 | 2.940 | 47.062 | 0.771 | 4.357 | 3.612 | 0.169 | NSCT_NSST | 52.610 | 4.872 | 47.647 | 0.868 | 4.832 | 3.906 | 0.380 | CNN | 87.236 | 6.208 | 73.907 | 0.721 | 5.688 | 3.933 | 0.294 | CSR | 54.208 | 4.753 | 47.214 | 0.794 | 4.245 | 3.383 | 0.285 | Proposed method | 92.152 | 15.279 | 76.870 | 0.943 | 4.333 | 4.947 | 0.505 |
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Table 4. Comparison of evaluation index of fusion results