Multiaxial Haar-like feature and compact cascaded classifier for versatile recognition

Jun Nishimura, Tadahiro Kuroda

    Research output: Contribution to journalArticlepeer-review

    2 Citations (Scopus)


    A versatile recognition algorithm has been proposed to process image, sound, and 3-D acceleration signals with a common framework at low calculation cost. Firstly, a novel 1-D Haar-like feature is used to roughly extract frequency information from temporal signals. Biaxial and mean-embedded Haar-like features are proposed to extract the standard deviation and the interaxial correlation from 3-D acceleration signals. Secondly, two techniques are proposed to build a compact cascaded classifier. Redundant feature selection (RFS) incorporates the features which are already selected in previous stage classifiers to reduce the calculation cost. A dynamic look-up table (DLUT) is proposed to construct a look-up table-based weak classifier with the smallest possible number of bins. A train loss function is by globally optimized using dynamic programming. The proposed algorithm is tested experimentally on speech/nonspeech classification and human activity recognition. The proposed algorithm yields a speech/nonspeech classification performance comparable to the state-of-art method called MFCC while reducing the calculation cost by 100 times. The algorithm also achieves human activity recognition accuracy of 96.1% with calculation cost reduction of 84% compared with the state-of-art method based on C4.5 decision-tree classifier using the basic statistical features. The proposed algorithm has been employed to build the versatile recognition processor.

    Original languageEnglish
    Article number5482111
    Pages (from-to)1786-1795
    Number of pages10
    JournalIEEE Sensors Journal
    Issue number11
    Publication statusPublished - 2010 Sept 22


    • Cascaded classifier
    • Haar-like feature
    • versatile recognition

    ASJC Scopus subject areas

    • Instrumentation
    • Electrical and Electronic Engineering


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