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In this paper, vocabulary tree based large-scale image retrieval scheme is proposed that can achieve higher accuracy and speed. The novelty of this paper can be summarized as follows. First, because traditional Scale Invariant Feature Transform (SIFT) descriptors are excessively concentrated in some areas of images, the extraction process of SIFT features is optimized to reduce the number. Then, combined...
How to efficiently retrieve the images while preserving the user's privacy has gradually become a key problem in some applications such as Cloud storage, social networks. In this paper, a secure index used for image retrieval is constructed to protect the retrieval results being leaked to the malicious attackers. At first, inverted index is generated using visual words of images and then encrypted...
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