发明名称 |
Non-fingerprint region indicator |
摘要 |
Signalling means for enhancing the performance of automatic fingerprint identification systems by reducing system response to non-fingerprint-like regions within an image field pattern of interest. A two dimensional generalized sequency analyzer, such as a fast Fourier transform machine, responsive to a binary coded image signal identifies discrete frequency terms occurring within a selected bandwidth corresponding to a spatial frequency region of interest, associated with a fingerprint image. Logic means, responsive to the sequency analyzer, further identifies the relative energy levels of the bandwidth-limited spectral content of the binary coded image signal to signal the identity of a non-fingerprint-like region within the scanned image.
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申请公布号 |
US4225850(A) |
申请公布日期 |
1980.09.30 |
申请号 |
US19780960813 |
申请日期 |
1978.11.15 |
申请人 |
ROCKWELL INTERNATIONAL CORPORATION |
发明人 |
CHANG, TIEN-LIN;KABAIAN, JIMMY H.;RIGANATI, JOHN P.;WHITE, STANLEY A. |
分类号 |
G06K9/00;(IPC1-7):G06K9/00;A61B5/10 |
主分类号 |
G06K9/00 |
代理机构 |
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代理人 |
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主权项 |
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