NDLI: CoPhIR Image Collection under the Microscope

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CoPhIR Image Collection under the Microscope

Content Provider	ACM Digital Library
Author	Novak, David Kohoutkova, Petra Batko, Michal
Abstract	The Content-based Photo Image Retrieval (CoPhIR) dataset is the largest available database of digital images with corresponding visual descriptors. It contains five MPEG-7 global descriptors extracted from more than 106 million images from Flickr photo-sharing system. In this paper, we analyze this dataset focusing on 1) efficiency of similarity-based indexing and searching and on 2) expressiveness of combination of the descriptors with respect to subjective perception of visual similarity. We treat the descriptors as metric spaces and then combine them into a multi-metric space. We analyze distance distributions of individual descriptors, measure intrinsic dimensionality of these datasets and statistically evaluate correlation between these descriptors. Further, we use two methods to assess subjective accuracy and satisfaction of similarity retrieval based on a combination of descriptors that is recommended for CoPhIR, and we compare these results on databases of 10 and 100 million CoPhIR images. Finally, we suggest, explore and evaluate two approaches to improve the accuracy: 1) applying logarithms in order to weaken influence of a single descriptor contribution if it deviates from the rest, and 2) the possibility of categorization of the dataset and identifying visual characteristics important for individual categories.
Starting Page	47
Ending Page	54
Page Count	8
File Format	PDF
ISBN	9780769537658
DOI	10.1109/SISAP.2009.25
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2009-08-29
Access Restriction	Subscribed
Subject Keyword	Metric space mpeg-7 visual descriptors cophir dataset dataset analysis
Content Type	Text
Resource Type	Article

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