测绘通报 ›› 2019, Vol. 0 ›› Issue (8): 34-38,53.doi: 10.13474/j.cnki.11-2246.2019.0247

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Content retrieval of large-scale remote sensing images based on dynamic threshold hashing

QIANG Yonggang1, XIAO Zhifeng2, CHEN Huanhuan1, YAN Liyang2   

  1. 1. College of Computer Science and Technology, University of Science and Technology of China, Hefei 230027, China;
    2. State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China
  • Received:2018-11-01 Revised:2019-02-15 Online:2019-08-25 Published:2019-09-06

Abstract: With the rapid development of remote sensing earth observation technology in China, the amount of remote sensing image data received and archived has increased exponentially. The traditional retrieval methods are difficult to retrieve the large amount of remote sensing image data quickly, resulting in the lack of breakthrough in remote sensing image retrieval technology, the utilization ratio and utilization efficiency of remote sensing images in China are very limited. In this paper, an innovative hash index method is proposed, which generates the hash codes dynamically according to the spatial distribution of the feature vectors. This method can encode the feature vectors of high-dimensional remote sensing images in low dimensions, greatly reduces the amount of retrieval computation and significantly improves the retrieval accuracy and efficiency of large-scale remote sensing image database. The retrieval experiments on the sky map data set show that the proposed method has a significant improvement in accuracy and retrieval efficiency, and has a great application potential.

Key words: remote sensing image retrieval, hash algorithm, feature index, dimensionality reduction

CLC Number: