Contour code: Robust and efficient multispectral palmprint encoding for human recognition

Z. Khan, Ajmal Mian, Yiqun Hu

    Research output: Chapter in Book/Conference paperConference paperpeer-review

    64 Citations (Scopus)
    401 Downloads (Pure)


    We propose `Contour Code', a novel representation and binary hash table encoding for multispectral palmprint recognition. We first present a reliable technique for the extraction of a region of interest (ROI) from palm images acquired with non-contact sensors. The Contour Code representation is then derived from the Nonsubsampled Contourlet Transform. A uniscale pyramidal filter is convolved with the ROI followed by the application of a directional filter bank. The dominant directional subband establishes the orientation at each pixel and the index corresponding to this subband is encoded in the Contour Code representation. Unlike existing representations which extract orientation features directly from the palm images, the Contour Code uses a two stage filtering to extract robust orientation features. The Contour Code is binarized into an efficient hash table structure that only requires indexing and summation operations for simultaneous one-to-many matching with an embedded score level fusion of multiple bands. We quantitatively evaluate the accuracy of the ROI extraction by comparison with a manually produced ground truth. Multispectral palmprint verification results on the PolyU and CASIA databases show that the Contour Code achieves an EER reduction upto 50%, compared to state-of-the-art methods.
    Original languageEnglish
    Title of host publication2011 IEEE International Conference on Computer Vision (ICCV)
    Place of PublicationUSA
    PublisherIEEE, Institute of Electrical and Electronics Engineers
    Pages1935 - 1942
    ISBN (Print)9781457711015
    Publication statusPublished - 2011
    Event2011 IEEE International Conference on Computer Vision (ICCV) - Barcelona, Spain
    Duration: 6 Nov 201113 Nov 2011


    Conference2011 IEEE International Conference on Computer Vision (ICCV)


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