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公开(公告)号：EP0216902A4
公开(公告)日：1989-02-20
申请号：EP86902617
申请日：1986-04-01
Applicant: FINGERMATRIX INC
Inventor： SCHILLER MICHAEL
CPC classification number: G07C9/00158 , G06K9/00006
Abstract: A set of Search identification points (16) derived from an optical scan (12) of a finger are compared against File identification (18) points for the same finger. A multiple comparator (20) divides the finger image into multiple segments. The Search and File points from each segment are compared separately. A difference table (D.T.) (22) provides a proximity value Q for each search point. The D.T. is purged (28, 30) of all entries representing multiple Search points. The purge keeps those entries having the highest Q value. The purged D.T. with recalculated Q values is the basis for correcting the position of each Search point on the image plane to compensate for shift in finger position and for the variable distortion and changes that come about in a finger over time and upon successive applications of the finger to input scan (40). The corrected Search points are compared against the File points to establish a new D.T. A proximity value Q for each entry on this D.T. is calculated and a proximity value Q for the entire table is calculated. These proximity values in view of the number of entries on the difference table are used to verify identification in a scoring routine (52).
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公开(公告)号：DE3380646D1
公开(公告)日：1989-11-02
申请号：DE3380646
申请日：1983-03-25
Applicant: FINGERMATRIX INC
Inventor： SCHILLER MICHAEL
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 possibe. 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.
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公开(公告)号：DE3176657D1
公开(公告)日：1988-03-31
申请号：DE3176657
申请日：1981-11-12
Applicant: FINGERMATRIX INC
Inventor： SCHILLER MICHAEL
Abstract: A finger (F) pressed against a platen (32) provides a fingerprint object which is scanned by an interrogating beam of collimated light (30) in the form of a slit and that is linearly displaced across the platen. As the slit-beam scans across the back surface of the platen, the reflected light beam is modulated. The modulated beam is imaged onto a linear array of photodiodes (12) to provide a series of output signals indicative of modulation information. The outputs of the diodes are serially interrogated at each of successive scan positions to provide a set of signals containing fingerprint information. The platen has a transparent glass base (92). A layer of transparent, compressible, resilient epoxy (94) is on the back of the glass base (92). The epoxy layer (94) has a flat back surface. A thin silver reflecting layer (96) on the back surface of the epoxy provides a flat mirrored surface to reflect the light beam. A further epoxy layer (97) on top of the silver provides mechanical filtering. A lacquer layer (99) at the back protects the platen from wear. When a finger is applied to the back surface, the ridges of the finger distort the underlying layers sufficiently so that the reflected light at the ridge zones is scattered while the reflected light at the valley zones is collimated. This difference in scatter is transformed by an imaging lens (65) to a difference in intensity at the diode array (12).
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公开(公告)号：AT32554T
公开(公告)日：1988-03-15
申请号：AT81109648
申请日：1981-11-12
Applicant: FINGERMATRIX INC
Inventor： SCHILLER MICHAEL
IPC: A61B5/10
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公开(公告)号：FI864881A0
公开(公告)日：1986-12-01
申请号：FI864881
申请日：1986-12-01
Applicant: FINGERMATRIX INC
Inventor： SCHILLER MICHAEL
Abstract: A set of Search identification points (16) derived from an optical scan (12) of a finger are compared against File identification (18) points for the same finger. A multiple comparator (20) divides the finger image into multiple segments. The Search and File points from each segment are compared separately. A difference table (D.T.) (22) provides a proximity value Q for each search point. The D.T. is purged (28, 30) of all entries representing multiple Search points. The purge keeps those entries having the highest Q value. The purged D.T. with recalculated Q values is the basis for correcting the position of each Search point on the image plane to compensate for shift in finger position and for the variable distortion and changes that come about in a finger over time and upon successive applications of the finger to input scan (40). The corrected Search points are compared against the File points to establish a new D.T. A proximity value Q for each entry on this D.T. is calculated and a proximity value Q for the entire table is calculated. These proximity values in view of the number of entries on the difference table are used to verify identification in a scoring routine (52).
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Patent Agency Ranking
公开(公告)号：NO861058L
公开(公告)日：1986-09-29
申请号：NO861058
申请日：1986-03-19
Applicant: FINGERMATRIX INC
Inventor： SCHILLER MICHAEL
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.
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公开(公告)号：ZA834961B
公开(公告)日：1984-04-25
申请号：ZA834961
申请日：1983-07-07
Applicant: FINGERMATRIX INC
Inventor： SCHILLER MICHAEL
Abstract: In an optical fingerprint image processing apparatus a light beam is scanned across a finger placed against a transparent platen in order to provide a reflected modulated light beam carrying fingerprint information. The modulated light beam is imaged and the image is intercepted by an array of photo receptors that detect the image and convert the optical signal into electrical signals. The improvement is in placing a diffuser element, which may be a ground glass wafer, in the interrogating light beam. The diffusion of the light beam acts as an effective filter to eliminate the higher spatial frequency components of the optical image and thus provide a fingerprint image having improved continuity.
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公开(公告)号：FI880364A
公开(公告)日：1988-07-30
申请号：FI880364
申请日：1988-01-27
Applicant: FINGERMATRIX INC
Inventor： SCHILLER MICHAEL , MARCUS DANIEL H
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.
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公开(公告)号：CA1234218A
公开(公告)日：1988-03-15
申请号：CA497068
申请日：1985-12-06
Applicant: FINGERMATRIX INC
Inventor： SCHILLER MICHAEL
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 horizonally 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 horizonally derived image which includes the best imagery from each of those two intermediate images.
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公开(公告)号：DK47288D0
公开(公告)日：1988-01-29
申请号：DK47288
申请日：1988-01-29
Applicant: FINGERMATRIX INC
Inventor： SCHILLER MICHAEL , MARCUS DANIEL H
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.
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