论文标题
语义增强图像群集
Semantic-Enhanced Image Clustering
论文作者
论文摘要
图像聚类是计算机视觉中的重要且有挑战的任务。尽管已经提出了许多方法来求解图像聚类任务,但它们仅根据图像特征探索图像并揭示簇,因此无法区分视觉上相似但在语义上不同的图像。在本文中,我们建议借助视觉语言预训练模型研究图像聚类的任务。不同于零摄像机的设置,在该设置中,类名称是已知的,我们只知道此设置中的簇数。因此,如何将图像映射到适当的语义空间以及如何从图像和语义空间聚集图像是两个关键问题。为了解决上述问题,我们提出了一种由视觉语言预训练模型剪辑引导的新型图像聚类方法,称为\ textbf {语义增强图像群集(SIC)}。在这种新方法中,我们提出了一种将给定图像映射到适当的语义空间的方法,首先是根据图像和语义之间的关系来生成伪标记的方法。最后,我们建议以一种自我监督的学习方式在图像空间和语义空间中进行一致性学习进行集群。收敛分析的理论结果表明,我们所提出的方法可以以均匀速度收敛。对期望风险的理论分析还表明,我们可以通过提高社区一致性,提高预测信心或降低邻里失衡来降低预期风险。五个基准数据集的实验结果清楚地显示了我们新方法的优势。
Image clustering is an important and open-challenging task in computer vision. Although many methods have been proposed to solve the image clustering task, they only explore images and uncover clusters according to the image features, thus being unable to distinguish visually similar but semantically different images. In this paper, we propose to investigate the task of image clustering with the help of a visual-language pre-training model. Different from the zero-shot setting, in which the class names are known, we only know the number of clusters in this setting. Therefore, how to map images to a proper semantic space and how to cluster images from both image and semantic spaces are two key problems. To solve the above problems, we propose a novel image clustering method guided by the visual-language pre-training model CLIP, named \textbf{Semantic-Enhanced Image Clustering (SIC)}. In this new method, we propose a method to map the given images to a proper semantic space first and efficient methods to generate pseudo-labels according to the relationships between images and semantics. Finally, we propose performing clustering with consistency learning in both image space and semantic space, in a self-supervised learning fashion. The theoretical result of convergence analysis shows that our proposed method can converge at a sublinear speed. Theoretical analysis of expectation risk also shows that we can reduce the expected risk by improving neighborhood consistency, increasing prediction confidence, or reducing neighborhood imbalance. Experimental results on five benchmark datasets clearly show the superiority of our new method.