期刊
COMPUTER VISION AND IMAGE UNDERSTANDING
卷 114, 期 6, 页码 681-699出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.cviu.2010.03.008
关键词
Early vision; Phase-based image analysis; Multichannel filtering; Image representations; Stereo; Motion; Bio-inspired vision processing
资金
- European Union IST-FET Future and Emergent Technologies [16276-2]
The problem of representing the visual signal in the harmonic space guaranteeing a complete characterization of its 2D local structure is investigated. Specifically, the efficacy of anisotropic versus isotropic filtering is analyzed with respect to general phase-based metrics for early vision attributes. We verified that the spectral information content gathered through channeled oriented frequency bands is characterized by high compactness and flexibility, since a wide range of visual attributes emerge from different hierarchical combinations of the same channels. We observed that constructing a multichannel, multiorientation representation is preferable than using a more compact one based on an isotropic generalization of the analytic signal. Maintaining a channeled (i.e., distributed) representation of the harmonic content results in a more complete structural analysis of the visual signal, and allows us to enable a set of constraints that are often essential to disambiguate the perception of the different features. The complete harmonic content is then combined in the phase-orientation space at the final stage, only, to come up with the ultimate perceptual decisions, thus avoiding an early condensation of basic features. The resulting algorithmic solutions reach high performance in real-world situations at an affordable computational cost. (C) 2010 Elsevier Inc. All rights reserved.
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