Cross-matching contactless fingerprints against legacy contact-based fingerprints

    公开(公告)号:US11972630B2

    公开(公告)日:2024-04-30

    申请号:US17616040

    申请日:2020-06-03

    CPC classification number: G06V40/1347 G06V10/772 G06V10/82

    Abstract: Various examples are provided for distortion rectification and fingerprint crossmatching. In one example, a method includes selecting an electronic, perspective distorted fingerprint sample; and generating an unwarped fingerprint sample by rectifying perspective distortions from the perspective distorted fingerprint sample by application of an unwarping transformation. Parameters of the unwarping transformation can be determined by a deep convolutional neural network (DCNN) trained on a database comprising contactless fingerprint samples suffering from perspective distortions. In another example, a system comprises processing circuitry that can: identify warp parameters associated with a contactless fingerprint sample, the warp parameters estimated from the contactless fingerprint sample by a DCNN trained on a database comprising contactless fingerprint samples suffering from perspective distortions; and generate an unwarped fingerprint sample from the contactless fingerprint sample, the unwarped fingerprint sample generated using an unwarping transformation based upon the identified warp parameters.

    INVARIANT REPRESENTATIONS OF HIERARCHICALLY STRUCTURED ENTITIES

    公开(公告)号:US20240037924A1

    公开(公告)日:2024-02-01

    申请号:US18039810

    申请日:2021-12-01

    Inventor: Helmut LINDE

    CPC classification number: G06V10/82 G06V10/86 G06V10/76 G06V10/772 G06V10/753

    Abstract: A method for processing digital image recognition of invariant representations of hierarchically structured entities can be performed by a computer using an artificial neural network. The method involves learning a sparse coding dictionary on an input signal to obtain a representation of low-complexity components. Possible transformations are inferred from the statistics of the sparse representation by computing a correlation matrix. Eigenvectors of the Laplacian operator on the graph whose adjacency matrix is the correlation matrix from the previous step are computed. A coordinate transformation is performed to the base of eigenvectors of the Laplacian operator, and the first step is repeated with the next higher hierarchy level until all hierarchy levels of the invariant representations of the hierarchically structured entities are processed and the neural network is trained. The trained artificial neural network can then be used for digital image recognition of hierarchically structured entities.

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