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A Unified Framework for Compression and Compressed Sensing of Light Fields and Light Field Videos
Linköpings universitet, Institutionen för teknik och naturvetenskap, Medie- och Informationsteknik. Linköpings universitet, Tekniska fakulteten.
Linköpings universitet, Institutionen för teknik och naturvetenskap, Medie- och Informationsteknik. Linköpings universitet, Tekniska fakulteten.
Linköpings universitet, Institutionen för teknik och naturvetenskap, Medie- och Informationsteknik. Linköpings universitet, Tekniska fakulteten.ORCID-id: 0000-0002-7765-1747
2019 (engelsk)Inngår i: ACM Transactions on Graphics, ISSN 0730-0301, E-ISSN 1557-7368, Vol. 38, nr 3, s. 1-18, artikkel-id 23Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

In this article we present a novel dictionary learning framework designed for compression and sampling of light fields and light field videos. Unlike previous methods, where a single dictionary with one-dimensional atoms is learned, we propose to train a Multidimensional Dictionary Ensemble (MDE). It is shown that learning an ensemble in the native dimensionality of the data promotes sparsity, hence increasing the compression ratio and sampling efficiency. To make maximum use of correlations within the light field data sets, we also introduce a novel nonlocal pre-clustering approach that constructs an Aggregate MDE (AMDE). The pre-clustering not only improves the image quality but also reduces the training time by an order of magnitude in most cases. The decoding algorithm supports efficient local reconstruction of the compressed data, which enables efficient real-time playback of high-resolution light field videos. Moreover, we discuss the application of AMDE for compressed sensing. A theoretical analysis is presented that indicates the required conditions for exact recovery of point-sampled light fields that are sparse under AMDE. The analysis provides guidelines for designing efficient compressive light field cameras. We use various synthetic and natural light field and light field video data sets to demonstrate the utility of our approach in comparison with the state-of-the-art learning-based dictionaries, as well as established analytical dictionaries.

sted, utgiver, år, opplag, sider
ACM Digital Library, 2019. Vol. 38, nr 3, s. 1-18, artikkel-id 23
Emneord [en]
Light field video compression, compressed sensing, dictionary learning, light field photography
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-158026DOI: 10.1145/3269980ISI: 000495415600005OAI: oai:DiVA.org:liu-158026DiVA, id: diva2:1328997
Tilgjengelig fra: 2019-06-24 Laget: 2019-06-24 Sist oppdatert: 2019-11-27bibliografisk kontrollert

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A Unified Framework for Compression and Compressed Sensing of Light Fields and Light Field Videos(37253 kB)104 nedlastinger
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