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Entropy 2014, 16(7), 3848-3865; doi:10.3390/e16073848
Article

Hierarchical Geometry Verification via Maximum Entropy Saliency in Image Retrieval

1,2
,
1
 and
1,2,*
Received: 5 April 2014 / Revised: 16 June 2014 / Accepted: 30 June 2014 / Published: 14 July 2014
(This article belongs to the Special Issue Maximum Entropy and Its Application)
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Abstract

We propose a new geometric verification method in image retrieval—Hierarchical Geometry Verification via Maximum Entropy Saliency (HGV)—which aims at filtering the redundant matches and remaining the information of retrieval target in images which is partly out of the salient regions with hierarchical saliency and also fully exploring the geometric context of all visual words in images. First of all, we obtain hierarchical salient regions of a query image based on the maximum entropy principle and label visual features with salient tags. The tags added to the feature descriptors are used to compute the saliency matching score, and the scores are regarded as the weight information in the geometry verification step. Second we define a spatial pattern as a triangle composed of three matched features and evaluate the similarity between every two spatial patterns. Finally, we sum all spatial matching scores with weights to generate the final ranking list. Experiment results prove that Hierarchical Geometry Verification based on Maximum Entropy Saliency can not only improve retrieval accuracy, but also reduce the time consumption of the full retrieval.
Keywords: image retrieval; geometry verification; saliency detection; maximum entropy image retrieval; geometry verification; saliency detection; maximum entropy
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Zhao, H.; Li, Q.; Liu, P. Hierarchical Geometry Verification via Maximum Entropy Saliency in Image Retrieval. Entropy 2014, 16, 3848-3865.

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