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Automatic Change Analysis in Satellite Images Using Binary Descriptors and Lloyd–Max Quantization

Automatic Change Analysis in Satellite Images Using Binary Descriptors and Lloyd–Max Quantization

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Automatic Change Analysis in Satellite Images Using Binary Descriptors and Lloyd–Max Quantization

 In this letter, we present a novel technique for unsupervised change analysis that leads to a method of ranking the changes that occur between two satellite images acquired at different moments of time. The proposed change analysis is based on binary descriptors and uses the Hamming distance as a similarity metric. In order to render a completely unsupervised solution, the obtained distances are further classi?ed using vector quantization methods (i.e., Lloyd’s algorithm for optimal quantization). The ultimate goal in the change analysis chain is to build change intensity maps that provide an overview of the severeness of changes in the area under analysis. In addition, the proposed analysis technique can be easily adapted for change detection by selecting only two levels for quantization. This discriminative method (i.e., between changed/unchanged zones) is compared with other previously developed techniques that use principal component analysis or Bayes theory as starting points for their analysis. The experiments are carried on Landsat images at a 30-m spatial resolution, covering an area of approximately 59 × 51 km over the surroundings of Bucharest, Romania, and containing multispectral information.


 


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  • Model: PROJ5002
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This product was added to our catalog on Wednesday 05 October, 2016.

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