A Novel Triplet Sampling Method for Multi-Label Remote Sensing Image Search and Retrieval

• URL: http://arxiv.org/abs/2105.03647v1
• Date: Sat, 8 May 2021 09:16:09 GMT
• Title: A Novel Triplet Sampling Method for Multi-Label Remote Sensing Image Search and Retrieval
• Authors: Tristan Kreuziger, Mahdyar Ravanbakhsh, Beg\"um Demir
• Abstract summary: A common approach for learning the metric space relies on the selection of triplets of similar (positive) and dissimilar (negative) images. We propose a novel triplet sampling method in the framework of deep neural networks (DNNs) defined for multi-label RS CBIR problems.
• Score: 1.123376893295777
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Learning the similarity between remote sensing (RS) images forms the foundation for content based RS image retrieval (CBIR). Recently, deep metric learning approaches that map the semantic similarity of images into an embedding space have been found very popular in RS. A common approach for learning the metric space relies on the selection of triplets of similar (positive) and dissimilar (negative) images to a reference image called as an anchor. Choosing triplets is a difficult task particularly for multi-label RS CBIR, where each training image is annotated by multiple class labels. To address this problem, in this paper we propose a novel triplet sampling method in the framework of deep neural networks (DNNs) defined for multi-label RS CBIR problems. The proposed method selects a small set of the most representative and informative triplets based on two main steps. In the first step, a set of anchors that are diverse to each other in the embedding space is selected from the current mini-batch using an iterative algorithm. In the second step, different sets of positive and negative images are chosen for each anchor by evaluating relevancy, hardness, and diversity of the images among each other based on a novel ranking strategy. Experimental results obtained on two multi-label benchmark achieves show that the selection of the most informative and representative triplets in the context of DNNs results in: i) reducing the computational complexity of the training phase of the DNNs without any significant loss on the performance; and ii) an increase in learning speed since informative triplets allow fast convergence. The code of the proposed method is publicly available at https://git.tu-berlin.de/rsim/image-retrieval-from-triplets.

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