A practical subspace approach to landmarking

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    Abstract

    A probabilistic, maximum aposteriori approach to finding landmarks in a face image is proposed, which provides a theoretical framework for template based landmarkers. One such landmarker, based on a likelihood ratio detector, is discussed in detail. Special attention is paid to training and implementation issues, in order to minimize storage and processing requirements. In particular a fast approximate singular value decomposition method is proposed to speed up the training process and implementation of the landmarker in the Fourier domain is presented that will speed up the search process. A subspace method for outlier correction and an iterative implementation of the landmarker are both shown to improve its accuracy. The impact of carefully tuning the many parameters of the method is illustrated. The method is extensively tested and compared with alternatives.
    Original languageUndefined
    Pages (from-to)276-289
    Number of pages14
    JournalJournal of multimedia
    Volume5
    Issue number3
    DOIs
    Publication statusPublished - Jun 2010

    Keywords

    • Localization
    • Maximum a posteriori
    • Face Recognition
    • SCS-Safety
    • IR-74613
    • mouth
    • nose
    • Landmarking
    • outlier correction
    • (Eye)
    • METIS-277446
    • EWI-18784

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