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    • 摘要: 针对低照度图像增强过程中出现的色彩失真、噪声放大和细节信息丢失等问题,提出一种并行混合注意力的渐进融合图像增强方法(progressive fusion of parallel hybrid attention,PFA)。首先,设计多尺度加权聚合网络(multi-scale weighted aggregation,MWA),通过聚合不同感受野下学习到的多尺度特征,促进局部特征的全域化表征,加强原始图像细节信息的保留;其次,提出并行混合注意力结构(parallel hybrid attention module,PHA),利用像素注意力和通道注意力并联组合排列,缓解不同分支注意力分布滞后造成的颜色差异,通过相邻注意力间的信息相互补充有效提高图像的色彩表现力并弱化噪声;最后,设计渐进特征融合模块(progressive feature fusion module,PFM),在三个阶段由粗及细对前阶段输入特征进行再处理,补充因网络深度增加造成的浅层特征流失,避免因单阶段特征堆叠导致的信息冗余。LOL、DICM、MEF和LIME数据集上的实验结果表明,本文方法在多个评价指标上的表现均优于对比方法。

       

      Abstract: Aiming at the problems of color distortion, noise amplification, and loss of detailed information in the process of low illumination image enhancement, a progressive fusion of parallel hybrid attention (PFA) is proposed. First, a multi-scale weighted aggregation (MWA) network is designed to aggregate multi-scale features learned from different receptive fields, promote the global representation of local features, and strengthen the retention of original image details; Secondly, a parallel hybrid attention module (PHA) is proposed. Pixel attention and channel attention are combined in parallel to alleviate the color difference caused by the distribution lag of different branches of attention, and the information between adjacent attention is used to complement each other to effectively improve the color representation of images and reduce noise; Finally, a progressive feature fusion module (PFM) is designed to reprocess the input features of the previous stage from coarse to fine in three stages, supplement the shallow feature loss caused by the increase of network depth, and avoid the information redundancy caused by single stage feature stacking. The experimental results on LOL, DICM, MEF, and LIME datasets show that the performance of the method in this paper is better than that of the comparison methods on multiple evaluation indicators.