This paper aims at providing insight on the transferability of deep CNN features to unsupervised problems. We study the impact of different pretrained CNN feature extractors on the problem of image set clustering for object classification as well as fine-grained classification. We propose a rather straightforward pipeline combining deep-feature extraction using a CNN pretrained on ImageNet and a classic clustering algorithm to classify sets of images. This approach is compared to state-of-the-art algorithms in image-clustering and provides better results. These results strengthen the belief that supervised training of deep CNN on large datasets, with a large variability of classes, extracts better features than most carefully designed engineering approaches, even for unsupervised tasks. We also validate our approach on a robotic application, consisting in sorting and storing objects smartly based on clustering.

本文旨在探讨深度卷积神经网络特征对无监督问题的可迁移性，并研究不同的预训练卷积神经网络特征提取器对于图像集群聚类和细粒度分类问题的影响，提出结合预训练的ImageNet中的深度特征提取和经典的聚类算法管道的分类方法，在图像聚类方面优于现有算法。作者同时在机器人应用中验证了该方法，成功实现了一种智能物体分类和存储的方案。

CNN特征在无监督分类方面表现出色