Image analysis – Applications – Personnel identification
Reexamination Certificate
1999-05-14
2001-08-28
Au, Amelia (Department: 2623)
Image analysis
Applications
Personnel identification
C340S005830
Reexamination Certificate
active
06282304
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a system and method for biometric input, comparison, and authentication and, more particularly, to a biometric input device having a scanning window with a ridge structure, illuminated prism, an image detector and scanning electronics operable in conjunction with biometric data comparison system for comparing directional and minutia data. The biometric data comparison system provides for controlled access to a computing system based upon comparison of inputted biometric data with biometric data stored in a database. The system and method of the present invention further provides for secure communication of biometric data over public lines.
Biometric input devices are known for use with computing systems. Such biometric input devices include computer mouse designs. Existing designs for such biometric input devices have scanning windows lacking efficient positioning structure for scanning positioning and protection from ambient light, and do not provide mechanical integration of a position sensing ball assembly with an optical scanning assembly maximizing reliability of position sensing ball operation.
Biometric data comparison methods and systems are known. Such known systems and methods suffer from various drawbacks including intensive computing power requirements, intensive memory requirements, slow data transfer, slow comparison, and comparison reliability reduction due to environmental and physiological factors. Known systems also fail to provide for secure communication of biometric data over public lines.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the invention to provide a system and method for biometric input and comparison which overcomes the drawbacks of the prior art.
It is a further object of the invention to provide an ergonomically advantageous biometric input device which ensures increased precision is sampling biometric data.
It is a still further object of the invention to provide a biometric data comparison method which controls access to computers or data networks.
It is yet another object of the invention to provide a fingerprint comparison method which provides for accurate and rapid comparison of fingerprints while compensating for environmental and physiological factors.
An object of the present invention is also to provide a biometric based access control system for use on computers which permits a user to graphically apply biometric access control features to data and applications by the use of a user manipulated biometric protection icon.
Briefly stated, the present invention provides a biometric input device, system and method which includes a biometric input device having a scanning window surrounded by a ridge for ensuring positive positioning of a biometric sample such as a thumb. The biometric input device includes an optical assembly having a prism with a focusing lens disposed on a side thereof and optionally integrally formed therewith. A biometric comparison method is provided for comparing data from said biometric input device with data from a database using both directional image comparison and clusterized minutia location and direction comparison. A further system is provided for allowing access to computer functions based on the outcome of the comparison method.
The present invention also provides a biometric input device for accepting a fingerprint of a finger tip having opposing tip sides and a tip end, comprising a device body having a body wall defining an aperture and an optical assembly for scanning the fingerprint disposed in the device body. The optical assembly has a scanning surface at the aperture upon which the finger tip is placed for scanning of the fingerprint by the optical assembly. A ridge surrounds a portion of a periphery of the aperture such that the ridge engages the opposing tip sides and the tip end such as to position the fingerprint on the scanning surface and block ambient light.
A further feature of the present invention includes the aforesaid biometric input device having a device body with a bottom surface opposing a substrate upon which the device body is placed, a device body length and a front portion, a middle portion and a heel portion. A movement detection device for detecting movement of the device body relative the substrate is provided and the bottom surface defines a bottom surface aperture through which the movement detection device detects movement of the device body relative the substrate. The bottom surface aperture is disposed in the heel portion of the device body and the optical assembly is disposed in the middle portion of the device body. In an embodiment of the present invention the movement detection device has a ball protruding through the bottom surface aperture for engaging the substrate to register the movement of the device body relative the substrate.
According to a feature of the invention, there is further provided a biometric input device for accepting a fingerprint of a finger tip having opposing tip sides and a tip end, comprising a device body having a body side wall defining an aperture, an optical assembly for scanning the fingerprint disposed in the device body. The optical assembly includes an imaging component for converting a light image into pixel output and a lens for focusing the light image into the imaging component. The optical assembly includes a prism with first, second and third sides and a top side wherein the first side forms a scanning surface at the aperture upon which the finger tip is placed for scanning of the fingerprint by the optical assembly, the second side has the lens for focusing the light image into the imaging component disposed thereon, and the third side has a light absorbing layer.
The present invention also includes the above embodiment wherein, in the alternative or in combination with one another, the lens is formed integrally with the prism and a light emitting device is disposed to emit light into the prism from the top side of the prism to illuminate the fingerprint when disposed at the scanning surface.
According to a still further feature of the invention, there is provided a biometric comparison method comprising a series steps beginning with (a) scanning in a fingerprint and digitizing scanning signals to produce a matrix of print image data representing pixels. Next the method proceeds with (b) dividing the print image data into cells, each including a number of pixel data for contiguous pixels, and (c) calculating a matrix of directional image data DI using gradient statistics applied to the cells wherein the directional image data DI includes for each of the cells a cell position indicator and one of a cell vector indicative of a direction of ridge lines and an undirectional flag indicative of a nondirectional calculation results. Processing then continues with (d) skeletonizing the print image data, and (e) extracting minutia from the print image data and producing a minutia data set comprised of data triplets for each minutia extracted including minutia position data and minutia direction data. Next, a comparing process is initiated by (f) providing reference fingerprint data from a database wherein the reference fingerprint data includes reference directional image data DI and a reference minutia data set, and (g) performing successive comparisons of the directional image data DI with the reference directional image data DI and determining a directional difference DifDI for each of the successive comparisons wherein for each of the successive comparisons one of the directional image data DI and the reference directional image data DI is positionally shifted by adding position shift data. It a next step (h) it is determined for which of the successive comparisons the directional difference DifDI is the least and the position shift data thereof is selected as initial minutia shift data. A next stage of the comparison process proceeds with (i) positionally shifting minutia data by applying the initial minutia shift data to one of the minutia data set and t
Chernomordik Oleg Mikhailovich
Novikov Sergey Olegovich
Ahmed Samir
Au Amelia
Biolink Technologies International, Inc.
Malloy & Malloy P.A.
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