基于組?信息蒸餾殘差網(wǎng)絡(luò )的輕量級圖像超分辨率重建
doi: 10.16383/j.aas.c211089
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中南民族大學(xué)生物醫學(xué)工程學(xué)院 武漢 430074
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華中科技大學(xué)人工智能與自動(dòng)化學(xué)院 武漢 430074
基金項目: 國家自然科學(xué)基金(61976227, 62176096), 湖北省自然科學(xué)基金(2019CFB622)資助
G-IDRN: A Group-information Distillation Residual Network for Lightweight Image Super-resolution
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School of Biomedical Engineering, South-central Minzu University, Wuhan 430074
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School of Artificial Intelligence and Automation, Huazhong University of Science and Technology, Wuhan 430074
Funds: Supported by National Natural Science Foundation of China (61976227, 62176096) and Natural Science Foundation of Hubei Province (2019CFB622)
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摘要: 目前, 基于深度學(xué)習的超分辨算法已經(jīng)取得了很好性能, 但這些方法通常具有較大內存消耗和較高計算復雜度, 很難應用到低算力或便攜式設備上. 為了解決這個(gè)問(wèn)題, 設計一種輕量級的組?信息蒸餾殘差網(wǎng)絡(luò )(Group-information distillation residual network, G-IDRN)用于快速且精確的單圖像超分辨率任務(wù). 具體地, 提出一個(gè)更加有效的組?信息蒸餾模塊(Group-information distillation block, G-IDB)作為網(wǎng)絡(luò )特征提取基本塊. 同時(shí), 引入密集快捷連接, 對多個(gè)基本塊進(jìn)行組合, 構建組?信息蒸餾殘差組(Group-information distillation residual group, G-IDRG), 捕獲多層級信息和有效重利用特征. 另外, 還提出一個(gè)輕量的非對稱(chēng)殘差Non-local模塊, 對長(cháng)距離依賴(lài)關(guān)系進(jìn)行建模, 進(jìn)一步提升超分性能. 最后, 設計一個(gè)高頻損失函數, 去解決像素損失帶來(lái)圖像細節平滑的問(wèn)題. 大量實(shí)驗結果表明, 該算法相較于其他先進(jìn)方法, 可以在圖像超分辨率性能和模型復雜度之間取得更好平衡, 其在公開(kāi)測試數據集B100上, 4倍超分速率達到56 FPS, 比殘差注意力網(wǎng)絡(luò )快15倍.
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關(guān)鍵詞:
- 殘差網(wǎng)絡(luò ) /
- 超分辨率 /
- 特征蒸餾 /
- 高頻損失
Abstract: Recently, most super-resolution algorithms based on deep learning have achieved satisfactory results. However, these methods generally consume large memory and have high computational complexity, and are difficult to apply to low computing power or portable devices. To address this problem, this paper introduces a lightweight group-information distillation residual network (G-IDRN) for fast and accurate single image super-resolution. Specially, we propose a more effective group-information distillation block (G-IDB) as the basic block for feature extraction. Simultaneously, we introduce dense shortcut to combine them to construct a group-information distillation residual group (G-IDRG), which is used to capture multi-level information and effectively reuse the learned features. Moreover, a lightweight asymmetric residual Non-local block is proposed to model the long-range dependencies and further improve the performance of super-resolution. Finally, a high-frequency loss function is designed to alleviate the problem of smoothing image details caused by pixel-wise loss. Extensive experiments show the proposed algorithm achieves a better trade-off between image super-resolution performance and model complexity against other state-of-the-art super-resolution methods and gets 56 FPS on the public test dataset B100 with a scale factor of 4 times, which is 15 times faster than the residual channel attention network.-
Key words:
- Residual network /
- super-resolution /
- feature distillation /
- high-frequency loss
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圖 1 Urban100中圖像放大2倍時(shí), 參數量和峰值信噪比的對比結果
Fig. 1 Comparison results of the number of parameters and the peak single-to-noise ration for 2 times images on Urban100
圖 2 Urban100中Img024放大4倍時(shí), 不同SR方法的重建結果
Fig. 2 The reconstruction results of various SR methods for 4 times Img024 on Urban100
圖 3 組?信息蒸餾殘差網(wǎng)絡(luò )整體架構
Fig. 3 The architecture of the group-information distillation residual network
圖 6 Set14中barbara.png放大3倍的高頻提取圖像((a)裁剪的 HR 圖像; (b) HR 圖像的高頻提取圖; (c)裁剪的SR圖像; (d) SR圖像的高頻提取圖)
Fig. 6 High-frequency extraction images for 3 times barbara.png on Set14 ((a) Cropped HR image; (b) High-frequency extractionimage of HR image; (c) Cropped SR imag; (d) High-frequency extraction image of SR image)
圖 7 HR圖像和對應使用高斯低通濾波器提取的低頻信息圖
Fig. 7 HR images and their low-frequency information images extracted by the Gaussian low-pass filter
圖 8 使用不同損失權重系數的PSNR分數差值對比結果
Fig. 8 Comparison results of PSNR score differences with different loss weights
圖 10 各方法在Urban100上4倍SR的定性比較
Fig. 10 Qualitative comparisons of each method for 4 times SRs on Urban100
圖 12 Urban100中圖像放大4倍時(shí), 參數量和結構相似度的對比結果
Fig. 12 Comparison results of the number of parameters and the structural similarity for 4 times images on Urban100
表 1 消融實(shí)驗結果
Table 1 Ablation experiment results
基本塊 雙路重建策略 DS連接 ANRB PSNR (dB) 參數量 (K) 增幅PSNR (dB) | 參數量 (K) RFDB ? ? ? 37.893 534.0 0 | 0 $ \checkmark$ ? ? 37.931 514.2 $\uparrow$ 0.038 | $\downarrow$ 19.8 ? $ \checkmark$ ? 37.891 520.2 $ \downarrow$ 0.002 | $ \downarrow$ 13.8 ? ? $ \checkmark$ 37.916 534.3 $ \uparrow$ 0.023 | $ \uparrow$ 0.3 $ \checkmark$ ? $ \checkmark$ 37.934 514.4 $ \uparrow$ 0.041 | $ \downarrow$ 19.6 $ \checkmark$ $ \checkmark$ $ \checkmark$ 37.940 500.5 $ \uparrow$ 0.047 | $ \downarrow$ 33.5 G-IDB ? ? ? 37.955 449.4 $ \uparrow$ 0.062 | $ \downarrow$ 84.6 $ \checkmark$ $ \checkmark$ $ \checkmark$ 37.965 383.2 $ \uparrow$ 0.072 | $ \downarrow$ 150.8 
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表 2 ANRB中, 不同采樣特征點(diǎn)數的實(shí)驗結果
Table 2 The experimental results for different sampled feature points in ANRB
特征點(diǎn)數 Set5
PSNR (dB)Manga109
PSNR (dB)$128\times 128$像素
內存消耗 (MB)$180\times 180$像素
內存消耗 (MB)無(wú)ANRB 37.888 38.396 216 419 $S=50$ 37.893 38.439 224 436 $S=110$ 37.895 38.443 232 452 $S=222$ 37.861 38.325 246 480 $S=\infty$ 37.883 內存溢出 2266 8431
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表 3 使用不同損失權重系數的PSNR對比結果 (dB)
Table 3 Comparison results of PSNR with different loss weights (dB)
權重系數 Set5 Set14 B100 Urban100 Manga109 $\alpha =1.0$, $\beta =0$ 37.907 33.423 32.063 31.830 38.483 $\alpha =0.8$, $\beta =0.2$ 37.900 33.406 32.071 31.850 38.476 $\alpha =0.6$, $\beta =0.4$ 37.930 33.421 32.075 31.843 38.483 $\alpha =0.4$, $\beta =0.6$ 37.975 33.444 32.084 31.878 38.576 $\alpha =0.2$, $\beta =0.8$ 37.901 33.467 32.084 31.860 38.462
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表 4 在5個(gè)基準數據集上, 圖像放大2倍、3倍和4倍時(shí), 各算法的參數量、PSNR和SSIM定量分析結果
Table 4 Parameters, PSNR and SSIM quantitative comparisons of various algorithms for 2, 3, and 4 times images on the five benchmark datasets
方法 放大
倍數參數量
(K)Set5
PSNR (dB) / SSIMSet14
PSNR (dB) / SSIMB100
PSNR (dB) / SSIMUrban100
PSNR (dB) / SSIMManga109
PSNR (dB) / SSIMBicubic 2倍 ? 33.66 / 0.9299 30.24 / 0.8688 29.56 / 0.8431 26.88 / 0.8403 30.80 / 0.9339 SRCNN 8 36.66 / 0.9542 32.45 / 0.9067 31.36 / 0.8879 29.50 / 0.8946 35.60 / 0.9663 DRCN 1774 37.63 / 0.9588 33.04 / 0.9118 31.85 / 0.8942 30.75 / 0.9133 37.55 / 0.9732 LapSRN 251 37.52 / 0.9591 32.99 / 0.9124 31.80 / 0.8952 30.41 / 0.9103 37.27 / 0.9740 DRRN 298 37.74 / 0.9591 33.23 / 0.9136 32.05 / 0.8973 31.23 / 0.9188 37.88 / 0.9749 MemNet 678 37.78 / 0.9597 33.28 / 0.9142 32.08 / 0.8978 31.31 / 0.9195 37.72 / 0.9740 IDN 553 37.83 / 0.9600 33.30 / 0.9148 32.08 / 0.8985 31.27 / 0.9196 38.01 / 0.9749 SRMDNF 1511 37.79 / 0.9601 33.32 / 0.9159 32.05 / 0.8985 31.33 / 0.9204 38.07 / 0.9761 CARN 1592 37.76 / 0.9590 33.52 / 0.9166 32.09 / 0.8978 31.92 / 0.9256 38.36 / 0.9765 SMSR 985 38.00 / 0.9601 33.64 / 0.9179 32.17 / 0.8993 32.19 / 0.9284 38.76 / 0.9771 IMDN 694 38.00 / 0.9605 33.63 / 0.9177 32.19 / 0.8997 32.17 / 0.9282 38.88 / 0.9774 IMDN-JDSR 694 38.00 / 0.9605 33.57 / 0.9176 32.16 / 0.8995 32.09 / 0.9271 ? / ? PAN 261 38.00 / 0.9605 33.59 / 0.9181 32.18 / 0.8997 32.01 / 0.9273 38.70 / 0.9773 RFDN-L 626 38.03 / 0.9606 33.65 / 0.9183 32.18 / 0.8997 32.16 / 0.9282 38.88 / 0.9772 LatticeNet 759 38.03 / 0.9607 33.70 / 0.9187 32.20 / 0.8999 32.25 / 0.9288 ? / ? G-IDRN 554 38.09 / 0.9608 33.80 / 0.9203 32.42 / 0.9003 32.42 / 0.9311 38.96 / 0.9773 Bicubic 3倍 ? 30.39 / 0.8682 27.55 / 0.7742 27.21 / 0.7385 24.46 / 0.7349 26.95 / 0.8556 SRCNN 8 32.75 / 0.9090 29.30 / 0.8215 28.41 / 0.7863 26.24 / 0.7989 30.48 / 0.9117 DRCN 1774 33.82 / 0.9226 29.76 / 0.8311 28.80 / 0.7963 27.15 / 0.8276 32.24 / 0.9343 LapSRN 502 33.81 / 0.9220 29.79 / 0.8325 28.82 / 0.7980 27.07 / 0.8275 32.21 / 0.9350 DRRN 298 34.03 / 0.9244 29.96 / 0.8349 28.95 / 0.8004 27.53 / 0.8378 32.71 / 0.9379 MemNet 678 34.09 / 0.9248 30.00 / 0.8350 28.96 / 0.8001 27.56 / 0.8376 32.51 / 0.9369 IDN 553 34.11 / 0.9253 29.99 / 0.8354 28.95 / 0.8013 27.42 / 0.8359 32.71 / 0.9381 SRMDNF 1528 34.12 / 0.9254 30.04 / 0.8382 28.97 / 0.8025 27.57 / 0.8398 33.00 / 0.9403 CARN 1592 34.29 / 0.9255 30.29 / 0.8407 29.06 / 0.8034 28.06 / 0.8493 33.50 / 0.9440 SMSR 993 34.40 / 0.9270 30.33 / 0.8412 29.10 / 0.8050 28.25 / 0.8536 33.68 / 0.9445 IMDN 703 34.36 / 0.9270 30.32 / 0.8417 29.09 / 0.8047 28.16 / 0.8519 33.61 / 0.9445 IMDN-JDSR 703 34.36 / 0.9269 30.32 / 0.8413 29.08 / 0.8045 28.12 / 0.8498 ? / ? PAN 261 34.40 / 0.9271 30.36 / 0.8423 29.11 / 0.8050 28.11 / 0.8511 33.61 / 0.9448 RFDN-L 633 34.39 / 0.9271 30.35 / 0.8419 29.11 / 0.8054 28.24 / 0.8534 33.74 / 0.9453 LatticeNet 765 34.40 / 0.9272 30.32 / 0.8416 29.10 / 0.8049 28.19 / 0.8513 ? / ? G-IDRN 565 34.43 / 0.9277 30.41 / 0.8431 29.14 / 0.8061 28.32 / 0.8552 33.79 / 0.9456 Bicubic 4倍 ? 28.42 / 0.8104 26.00 / 0.7027 25.96 / 0.6675 23.14 / 0.6577 24.89 / 0.7866 SRCNN 8 30.48 / 0.8626 27.50 / 0.7513 26.90 / 0.7101 24.52 / 0.7221 27.58 / 0.8555 DRCN 1774 31.53 / 0.8854 28.02 / 0.7670 27.23 / 0.7233 25.14 / 0.7510 28.93 / 0.8854 LapSRN 502 31.54 / 0.8852 28.09 / 0.7700 27.32 / 0.7275 25.21 / 0.7562 29.09 / 0.8900 DRRN 298 31.68 / 0.8888 28.21 / 0.7720 27.38 / 0.7284 25.44 / 0.7638 29.45 / 0.8946 MemNet 678 31.74 / 0.8893 28.26 / 0.7723 27.40 / 0.7281 25.50 / 0.7630 29.42 / 0.8942 IDN 553 31.82 / 0.8903 28.25 / 0.7730 27.41 / 0.7297 25.41 / 0.7632 29.41 / 0.8942 SRMDNF 1552 31.96 / 0.8925 28.35 / 0.7787 27.49 / 0.7337 25.68 / 0.7731 30.09 / 0.9024 CARN 1592 32.13 / 0.8937 28.60 / 0.7806 27.58 / 0.7349 26.07 / 0.7837 30.47 / 0.9084 SMSR 1006 32.13 / 0.8937 28.60 / 0.7806 27.58 / 0.7349 26.11 / 0.7868 30.54 / 0.9084 IMDN 715 32.21 / 0.8948 28.58 / 0.7811 27.56 / 0.7354 26.04 / 0.7838 30.45 / 0.9075 IMDN-JDSR 715 32.17 / 0.8942 28.62 / 0.7814 27.55 / 0.7350 26.06 / 0.7820 ? / ? PAN 272 32.13 / 0.8948 28.61 / 0.7822 27.59 / 0.7363 26.11 / 0.7854 30.51 / 0.9095 RFDN-L 643 32.23 / 0.8953 28.59 / 0.7814 27.57 / 0.7363 26.14 / 0.7871 30.61 / 0.9095 LatticeNet 777 32.18 / 0.8943 28.61 / 0.7812 27.57 / 0.7355 26.14 / 0.7844 ? / ? G-IDRN 580 32.24 / 0.8958 28.64 / 0.7824 27.61 / 0.7378 26.24 / 0.7903 30.63 / 0.9096
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表 5 Set14中圖像放大4倍時(shí), SSIM、PSNR和FLOPs的比較結果
Table 5 Comparison results of SSIM、PSNR andFLOPs for 4 times images on Set14
評價(jià)指標 CARN IMDN RFDN-L G-IDRN SSIM 0.7806 0.7810 0.7814 0.7826 PSNR (dB) 28.60 28.58 28.59 28.64 FLOPs (GB) 103.58 46.60 41.54 36.19
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表 6 B100中圖像放大4倍時(shí), 平均運行時(shí)間的比較結果
Table 6 Comparison results of average running time for4 times images on B100
方法 PSNR (dB) / SSIM 參數量 (K) 訓練時(shí)間 (s) 推理時(shí)間 (s) EDSR 27.71 / 0.7420 43090 — 0.2178 RCAN 27.77 / 0.7436 15592 — 0.2596 IMDN 27.56 / 0.7354 715 5.4 0.0217 RFDN-L 27.57 / 0.7363 633 6.1 0.0250 G-IDRN 27.61 / 0.7378 580 12.7 0.0177 IDRN 27.64 / 0.7389 2047 8.5 0.0692
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