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New non-negative sparse feature learning approach for content-based image retrieval

机译:基于内容的图像检索的新的非负稀疏特征学习方法

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摘要

One key issue in content-based image retrieval is to extract effective features so as to represent the visual content of an image. In this study, a new non-negative sparse feature learning approach to produce a holistic image representation based on low-level local features is presented. Specifically, a modified spectral clustering method is introduced to learn a non-negative visual dictionary from local features of training images. A non-negative sparse feature encoding method termed non-negative locality-constrained linear coding (NNLLC) is proposed to improve the popular locality-constrained linear coding method so as to obtain more meaningful and interpretable sparse codes for feature representation. Moreover, a new feature pooling strategy named kMaxSum pooling is proposed to alleviate the information loss of the sum pooling or max pooling strategy, which produces a more effective holistic image representation and can be viewed as a generalisation of the sum and max pooling strategies. The retrieval results carried out on two public image databases demonstrate the effectiveness of the proposed approach.
机译:基于内容的图像检索中的一个关键问题是提取有效特征,以表示图像的视觉内容。在这项研究中,提出了一种新的非负稀疏特征学习方法,该方法可基于低级局部特征生成整体图像表示。具体来说,引入了一种改进的光谱聚类方法,以从训练图像的局部特征中学习非负视觉词典。提出了一种非负稀疏特征编码方法,称为非负局部约束线性编码(NNLLC),以改进流行的局域约束线性编码方法,从而获得更有意义和可解释的稀疏代码用于特征表示。此外,提出了一种称为kMaxSum池的新特征池策略,以减轻和池或最大池策略的信息丢失,从而产生更有效的整体图像表示,并且可以看作是对和池和最大池策略的概括。在两个公共图像数据库上进行的检索结果证明了该方法的有效性。

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