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  1. Gallego, A.J.; Pertusa, A.; Gil, P.
    "Automatic Ship Classification from Optical Aerial Images with Convolutional Neural Networks"
    Remote Sensing, vol. 10, pp. 20 (2018)
    : bibtex : URL

    The automatic classification of ships from aerial images is a considerable challenge. Previous works have usually applied image processing and computer vision techniques to extract meaningful features from visible spectrum images in order to use them as the input for traditional supervised classifiers. We present a method for determining if an aerial image of visible spectrum contains a ship or not. The proposed architecture is based on Convolutional Neural Networks (CNN), and it combines neural codes extracted from a CNN with a k-Nearest Neighbor method so as to improve performance. The kNN results are compared to those obtained with the CNN Softmax output. Several CNN models have been configured and evaluated in order to seek the best hyperparameters, and the most suitable setting for this task was found by using transfer learning at different levels. A new dataset (named MASATI) composed of aerial imagery with more than 6000 samples has also been created to train and evaluate our architecture. The experimentation shows a success rate of over 99% for our approach, in contrast with the 79% obtained with traditional methods in classification of ship images, also outperforming other methods based on CNNs. A dataset of images (MWPU VHR-10) used in previous works was additionally used to evaluate the proposed approach. Our best setup achieves a success ratio of 86% with these data, significantly outperforming previous state-of-the-art ship classification methods.

@article {
 author = "Gallego, A.J.; Pertusa, A.; Gil, P.",
 title  = "Automatic Ship Classification from Optical Aerial Images with Convolutional Neural Networks",
 issn = "2072-4292",
 journal = "Remote Sensing",
 number = "4",
 pages = "20",
 volume = "10",
 year = "2018"
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