论文标题

学习图像超分辨率的深层分析词典

Learning Deep Analysis Dictionaries for Image Super-Resolution

论文作者

Huang, Jun-Jie, Dragotti, Pier Luigi

论文摘要

受深神经网络最近成功的启发,以及最近开发多层词典模型的努力,我们提出了一个深层分析词典模型(DEEPAM),该模型已进行了优化,该模型旨在解决一种特定的回归任务,称为单图超级分辨率。与其他多层词典模型相反,我们的体系结构包含L分析词典和软阈值操作员的L层,可逐渐提取高级特征和一层合成字典,旨在优化手头的回归任务。在我们的方法中,每个分析词典都分为两个句子:保存分析词典(iPad)和一个聚类分析词典(CAD)。 iPad与相应的软阈值一起旨在将关键信息从上一层传递到下一层,而CAD和相应的软阈值操作员旨在产生其输入数据的稀疏特征表示,以促进关键特征的歧视。 DeepAm使用监督和无监督的设置。仿真结果表明,与具有相同结构相同的深神经网络相比,提出的深层分析词典模型在训练数据集较小时使用后传播进行了优化。

Inspired by the recent success of deep neural networks and the recent efforts to develop multi-layer dictionary models, we propose a Deep Analysis dictionary Model (DeepAM) which is optimized to address a specific regression task known as single image super-resolution. Contrary to other multi-layer dictionary models, our architecture contains L layers of analysis dictionary and soft-thresholding operators to gradually extract high-level features and a layer of synthesis dictionary which is designed to optimize the regression task at hand. In our approach, each analysis dictionary is partitioned into two sub-dictionaries: an Information Preserving Analysis Dictionary (IPAD) and a Clustering Analysis Dictionary (CAD). The IPAD together with the corresponding soft-thresholds is designed to pass the key information from the previous layer to the next layer, while the CAD together with the corresponding soft-thresholding operator is designed to produce a sparse feature representation of its input data that facilitates discrimination of key features. DeepAM uses both supervised and unsupervised setup. Simulation results show that the proposed deep analysis dictionary model achieves better performance compared to a deep neural network that has the same structure and is optimized using back-propagation when training datasets are small.

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