Lightweight Image Super-Resolution Reconstruction Fused with Wavelet Convolution

doi:10.19678/j.issn.1000-3428.0252333

Abstract

Abstract: The primary challenge of Single Image Super-Resolution (SISR) tasks is to recover the high-frequency details of low-resolution images while reducing computational complexity and avoiding artifacts. To solve these problems effectively, a multiscale large-kernel network, WEMA-Net, fused with wavelet convolution, is proposed. First, the network combines wavelet transform convolution with a large kernel decomposition strategy and performs convolution operations in the frequency domain, which expands the receptive field and reduces computational complexity. Subsequently, a multiscale grouping mechanism is introduced to capture long-distance dependence and local texture information at different scales, and wavelet convolution is combined to reduce the artifacts that may be caused by large kernel convolution. Subsequently, an adaptive gated spatial attention unit is proposed that can dynamically adjust the attention weight according to the features of different regions for optimizing the fusion of local and global features and enhancing the recovery ability of details and edges. Additionally, a modulation convolution unit module is introduced, which further improves the flexibility of feature extraction by improving the robustness to outliers. Experiments on datasets such as Set5, Set14, B100, Urban100, and Manga109 reveal that WEMA-Net improves the Peak Signal-to-Noise Ratio (PSNR) compared to lightweight models such as RFDN, BSRN, LKDN, RepRFN, and OSFFNet. In the 4×super-resolution, the proposed method achieves 0.18 dB and 0.20 dB higher PSNR than LKDN on Urban100 and Manga109, respectively. The experimental results verify the superiority of the network in image detail recovery, computational efficiency, and robustness, indicating that the proposed method has wide application prospects.

Key words: Single Image Super-Resolution (SISR), deep learning, Wavelet Transform convolution (WTConv), attention mechanism, lightweight

摘要： 单图像超分辨率（SISR）任务当前面临的主要难题在于，如何在恢复低分辨率（LR）图像的高频细节同时降低计算复杂度和避免伪影的产生。为了有效解决这些问题，提出融合小波卷积的多尺度大核网络WEMA-Net。该网络首先把小波变换卷积(WTConv)与大核分解策略结合，在频域内进行卷积操作，扩展感受野并降低计算复杂度。再设计多尺度分组机制，在不同尺度上捕获长距离依赖和局部纹理信息，结合小波卷积减少大核卷积可能导致的伪影。接着提出自适应门控空间注意力单元，根据不同区域的特征动态调整注意力权重，从而优化局部和全局特征的融合，增强细节和边缘的恢复能力。此外，设计调制卷积单元模块，通过提升对异常值的鲁棒性，进一步提高特征提取的灵活性。在Set5、Set4、B100、Urban100、Manga109等数据集上的实验结果表明，WEMA-Net在峰值信噪比（PSNR）上相较于轻量化模型RFDN、BSRN、LKDN、RepRFN、OSFFNet等均有提升。在Urban100和Manga109数据集上，4倍超分辨率性能相比于LKDN分别提高0.18 dB和0.20 dB。实验结果验证了该网络在图像细节恢复、计算效率及鲁棒性方面的优越性，表明该方法具有广泛的应用前景。

关键词: 单图像超分辨率, 深度学习, 小波变换卷积, 注意力机制, 轻量化

CLC Number:

TP391

HU Jing, HUANG Wentao, HE Bingyi. Lightweight Image Super-Resolution Reconstruction Fused with Wavelet Convolution[J]. Computer Engineering, 2026, 52(11): 239-249.

胡静, 黄文韬, 贺秉毅. 融合小波卷积的轻量化图像超分辨率重建[J]. 计算机工程, 2026, 52(11): 239-249.

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