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    FINGERPRINT IDENTIFICATION SYSTEM
    21.
    发明专利
    FINGERPRINT IDENTIFICATION SYSTEM 未知

    公开(公告)号：CA1184659A

    公开(公告)日：1985-03-26

    申请号：CA424533

    申请日：1983-03-25

    Applicant: FINGERMATRIX INC

    Inventor： SCHILLER MICHAEL

    IPC: G06T7/00 ,  A61B5/00 ,  G06K9/00 ,  G07C9/00

    Abstract: An automatic fingerprint enrollment and identification technique is provided for automatically processing an input image represented by pixels having either a one or a zero value. The automatic processing involves a series of steps in which the initial processing is a rough screening technique for eliminating a reasonable portion of the noise while passing through almost all of the minutia. As the steps proceed, the processing becomes more complex to provide a tighter screening out of noise while passing through as much of the minutia as possible. The later steps by operating on relatively fewer minutia or anomaly points that the earlier steps can be economical though more complex so as to be more discriminate than the earlier steps. The processing provides an optimum trade off between enrolling as large a proportion of the population as possible while minimizing the number of false identification errors.

    24.
    发明专利
    未知

    公开(公告)号：DK47288A

    公开(公告)日：1988-07-30

    申请号：DK47288

    申请日：1988-01-29

    Applicant: FINGERMATRIX INC

    Inventor： SCHILLER MICHAEL ,  MARCUS DANIEL H

    IPC: A61B5/117 ,  G06K9/00 ,  G06T1/00 ,  G07C9/00

    Abstract: The technique for optically scanning a finger to produce a fingerprint image involves positioning the finger surface to be optically scanned so that it is exposed and, in particular, is not pressed against a platen. A slit light beam along the length of the forward part of the finger is circumferentially rotated (38) about an axis (x-x) about the nominal center of the finger. A reflected slit light beam carries modulation information which is focused on a linear array of photo-electric transducers (12) to provide the fingerprint image. The interrogating light is coherent, substantially collimated, light. The plane of the interrogating slit light beam and the plane of the reflected modulated slit light beam are coplanar thereby establishing an illumination plane (42). The illumination plane is parallel to the axis of the finger and is rotated about that axis during the interrogating scan. The illumination plane is slightly offset (d) from that rotational axis and the incident light (16) in the illumination plane impinges on the finger surface at a slight off-normal axis. This offset and off-normal incidence creates two dimensional shadowing. The finger surface being interrogated is positioned slightly off of the object plane for the downstream focusing optics thereby creating a constructive destructive interference effect at the image plane defined by the transducers.

    25.
    发明专利
    未知

    公开(公告)号：NO880371D0

    公开(公告)日：1988-01-28

    申请号：NO880371

    申请日：1988-01-28

    Applicant: FINGERMATRIX INC

    Inventor： SCHILLER MICHAEL ,  MARCUS DANIEL H

    IPC: A61B5/117 ,  G06K9/00 ,  G06T1/00 ,  G07C9/00 ,  G06K

    Abstract: The technique for optically scanning a finger to produce a fingerprint image involves positioning the finger surface to be optically scanned so that it is exposed and, in particular, is not pressed against a platen. A slit light beam along the length of the forward part of the finger is circumferentially rotated (38) about an axis (x-x) about the nominal center of the finger. A reflected slit light beam carries modulation information which is focused on a linear array of photo-electric transducers (12) to provide the fingerprint image. The interrogating light is coherent, substantially collimated, light. The plane of the interrogating slit light beam and the plane of the reflected modulated slit light beam are coplanar thereby establishing an illumination plane (42). The illumination plane is parallel to the axis of the finger and is rotated about that axis during the interrogating scan. The illumination plane is slightly offset (d) from that rotational axis and the incident light (16) in the illumination plane impinges on the finger surface at a slight off-normal axis. This offset and off-normal incidence creates two dimensional shadowing. The finger surface being interrogated is positioned slightly off of the object plane for the downstream focusing optics thereby creating a constructive destructive interference effect at the image plane defined by the transducers.

    28.
    发明专利
    未知

    公开(公告)号：FI861273A0

    公开(公告)日：1986-03-25

    申请号：FI861273

    申请日：1986-03-25

    Applicant: FINGERMATRIX INC

    Inventor： SCHILLER MICHAEL

    IPC: H04N1/415 ,  G06T3/40 ,  H03M7/30 ,  H04N1/40 ,  G06K

    Abstract: An optical and electronic scan produces an image composed of binary value pixels. An automatic picture compression routine reduces the number of pixels in the image. A first stage four to one reduction in the number of pixels is achieved by treating each mutually exclusive four pixel unit as a separate set. A binary value is assigned to each four pixel set. That binary value is assigned to a single pixel in a first output image. The same process is repeated a second time to provide a final output image that has one-sixteenth the number of pixels as has the original input image. The value assigned to each four pixel unit set is a weighted function of the binary value of each of the sixteen pixels in a four pixel by four pixel subfield in which the unit set is centered. The greatest weight is give to the center pixels, that is, to the four pixels of the unit set. Lesser weight is given to the peripheral pixels. Among the peripheral pixels, lesser weight is given to the four corner pixels than is given to the eight side pixels between the corners. In the weighting process, the significance of the binary value of the sixteen pixels in the subfield is in part a function of the total pattern of the pixel values in the subfield.

    29.
    发明专利
    未知

    公开(公告)号：DK315385A

    公开(公告)日：1986-01-13

    申请号：DK315385

    申请日：1985-07-10

    Applicant: FINGERMATRIX INC

    Inventor： SCHILLER MICHAEL

    IPC: A61B5/103 ,  A61B5/117 ,  G06K9/00 ,  G06T1/00 ,  G06T7/00 ,  G07C9/00 ,  G06K

    Abstract: A fingerprint image is derived from the direct optical reading of a finger by an optical and electronic scan of the finger with a beam of coherent, collimated light. The beam is shaped in the form of a slit of light which extends the length of the finger zone to be interrogated. That slit light beam is scanned across the finger in a direction perpendicular to the axis of that slit. The rays which constitute the interrogating light in the slit define an incident light beam in the form of a plane which is substantially perpendicular to the surface of the finger being interrogated. The light beam and the rest of the optical system is rotated about an axis that is substantially coincident with the axis of the finger so that this perpendicular relationship between the plane of the interrogating light beam and the surface of the finger is maintained throughout the scan.

    30.
    发明专利
    未知

    公开(公告)号：DK567185D0

    公开(公告)日：1985-12-06

    申请号：DK567185

    申请日：1985-12-06

    Applicant: FINGERMATRIX INC

    Inventor： SCHILLER MICHAEL

    IPC: G06T5/00 ,  G06K9/00 ,  G06K9/38 ,  G06T7/00 ,  G07C9/00 ,  G06K

    Abstract: A gray scale image of a fingerprint composed of a field of pixels is converted to a binary image composed of a field of pixels by a technique which takes into account the directivity of the ridge and valley structure. Three intermediate binary images are developed, one by the use of a vertical filter, one by the use of a horizonal filter and a reference image by the use of a filter which is not directionally biased. Corresponding subfields around each pixel in each of the three images are compared. If the subfield for the vertically derived image is closer to that of the reference image then is the subfield for the horizon- ally derived image, then the binary value for the pixel from the vertically derived image is used in the final image; and vice versa. In this fashion, a fourth a final binary image is derived from a combination of the vertically derived image and horizon- ally derived image which includes the best imagery from each of those two intermediate images.

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