Patent EP0585141A2 successfully refreshed from Google Patents.
EP0585141A2
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EP
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Individual identification apparatus
Assignee: Hamamatsu Photonics KK
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Filing: 1993-08-31
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Granted: —
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Expires: 2013-08-31
Abstract
Abstract In an individual identification apparatus, a hologram (11) recorded on a card is irradiated with laser light to read out a finger print image of a specific person. A finger of an arbitrary person to be identified with the specific person is irradiated with laser light to obtain a finger print image. Thus obtained finger print images are jointly written in a first spatial light modulator (SLM2). Then, the joint image is read out and Fourier transformed by lens (5) to obtain a Joint Fourier Transform image, which is then written in a second spatial light modulator (SLM2'). The Joint Fourier Transform image is then read out and Fourier transformed by lens (6) to obtain a pair of output correlation peaks. A photodetector (7) detects the intensity of the output correlation peaks and outputs a signal indicative of the intensity. A threshold processor (61) compares the value of the signal with a pre-determined threshold value to positively or negatively identify the arbitrary person with the specific person.
Inventors
- 👤 Tsutomu c/o Hamamatsu Photonics K.K. Hara
- 👤 Haruyoshi c/o Hamamatsu Photonics K.K. Toyoda
- 👤 Yuji c/o Hamamatsu Photonics K.K. Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 15:05
CPC Classifications
G; G06; G06V; G06V40/00; G06V40/10; G06V40/12; G06V40/1365; G06V10/00; G06V10/88; G06V10/92
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
347 words
An individual identification apparatus for measuring correlation between a body portion of a specific individual and a body portion of an arbitrary individual there by to positively or negatively identify the arbitrary individual as the specific individual, the individual identification apparatus comprising: first positioning means for positioning, at a first position, a portion of a body of an arbitrary individual to be identified with a specific individual; first reading means for irradiating light onto the portion of the body of the arbitrary individual which is positioned at the first position to obtain an optical image of the portion of the body of the arbitrary individual; first spatial light modulating means for receiving an optical joint image of the image of the portion of the body of the arbitrary individual and an image of a portion of a body of a specific individual, the optical joint image having the image of the portion of the body of the specific individual and the image of the portion of the body of the arbitrary individual at different positions, said first spatial light modulating means receiving and modulating read-light in accordance with the joint image; a lens for Fourier transforming the read-light modulated by and outputted from said first spatial light modulating means to thereby produce an optical Joint Fourier Transform image; second spatial light modulating means for receiving the optical Joint Fourier Transform image and receiving and modulating read-light in accordance with the Joint Fourier Transform image; a lens for Fourier transforming the read-light modulated by and outputted from said second spatial light modulating means thereby to produce an optical output correlation image; intensity detecting means for detecting the intensity of the optical output correlation image; and, calculating means for comparing a value of the detected intensity with a predetermined threshold value so as to judge correlation of the image of the portion of the body of the specific individual and the image of the portion of the body of the arbitrary individual thereby to determine whether or not the arbitrary individual and the specific individual are the same individual.
Claim 2
Dependent Claim
69 words
An individual identification apparatus as claimed in claim 1, wherein said first spatial light modulating means includes an optically-addressable spatial light modulator which has an optically-addressing part and a modulating part, the optically-addressing part receiving the optical joint image and changing optical characteristic of the modulating part in accordance with the optical joint image, the modulating part receiving and modulating the read-light in accordance with the changed optical characteristic.
Claim 3
Dependent Claim
75 words
An individual identification apparatus as claimed in claim 1 or 2, wherein said second spatial light modulating means includes an optically-addressable spatial light modulator which has an optically-addressing part and a modulating part, the optically-addressing part receiving the optical Joint Fourier Transform image and changing optical characteristic of the modulating part in accordance with the optical Joint Fourier Transform image, the modulating part receiving and modulating the read-light in accordance with the changed optical characteristic.
Claim 4
Dependent Claim
92 words
An individual identification apparatus as claimed in claim 1, wherein said first spatial light modulating means includes: image pick-up means for picking up the optical joint image and for converting the optical joint image into an electrical joint image; and an electrically-addressable spatial light modulator which has an electrically-addressing part and a modulating part, the electrically-addressing part receiving the electrical joint image and changing optical characteristic of the modulating part in accordance with the electrical joint image, the modulating part receiving and modulating the read-light in accordance with the changed optical characteristic.
Claim 5
Dependent Claim
104 words
An individual identification apparatus as claimed in claim 1 or 4, wherein said second spatial light modulating means includes: image pick-up means for picking up the optical Joint Fourier Transform image and for converting the optical Joint Fourier Transform image into an electrical Joint Fourier Transform image; and an electrically-addressable spatial light modulator which has an electrically-addressing part and a modulating part, the electrically-addressing part receiving the electrical Joint Fourier Transform image and changing optical characteristic of the modulating part in accordance with the electrical Joint Fourier Transform image, the modulating part receiving and modulating the read-light in accordance with the changed optical characteristic.
Claim 6
Dependent Claim
107 words
An individual identification apparatus as claimed in any preceding claim, wherein information on the portion of the body of the specific individual is recorded in an external storing device provided separately from the individual identification apparatus, further comprising information readout means for reading out the information from the external storing device to obtain an optical image of the portion of the body of the specific individual, said information readout means supplying the optical image of the portion of the body of the specific individual to said first spatial light modulating means so as to allow said first spatial light modulating means to receive the optical joint image.
Claim 7
Dependent Claim
82 words
An individual identification apparatus as claimed in claim 6, wherein the external storing device includes a card provided separately from the individual identification apparatus, and wherein said information readout means includes: second positioning means for positioning the card at a second position; and second reading means for irradiating light onto the card which is positioned at the second position and reading out the information from the card to obtain the optical image of the portion of the body of the specific individual.
Claim 8
Dependent Claim
116 words
An individual identification apparatus as claimed in claim 7, further comprising: first detecting means for detecting that the part of the body of the arbitrary individual is positioned on the first position; transporting means for transporting the card to the second position; second detecting means for detecting that the card is transported to the second position; and controlling means for controlling said calculating means to start comparing the value of the detected intensity with the predetermined threshold value after when said first detecting means detects that the portion of the body of the arbitrary individual is placed at the first position and said second detecting means detects that the card is transported to the second position.
Claim 9
Dependent Claim
395 words
A fingerprint identification apparatus for measuring correlation of an image of a fingerprint of a specific individual and an image of a fingerprint of an arbitrary individual to thereby determine whether or not the arbitrary individual is identified with the specific individual, the fingerprint identification apparatus comprising: first spatial light modulating means for receiving information on a joint image of an image of a fingerprint of a specific individual and an image of a fingerprint of an arbitrary individual to be identified with the specific individual and for receiving first read-light to spatially modulate the first read-light in accordance with the joint image; a first Fourier transform lens for receiving the first read-light modulated by and outputted from said first spatial light modulating means and spatially Fourier transforming the first read-light to thereby allow the first read-light to form a Joint Fourier Transform image for the image of the fingerprint of the specific individual and the image of the fingerprint of the arbitrary individual; second spatial light modulating means for receiving the Joint Fourier Transform image and for receiving second read-light to spatially modulate the second read-light in accordance with the Joint Fourier Transform image; a second Fourier transform lens for receiving the second read-light modulated by and outputted from said second spatial light modulating means and spatially Fourier transforming the second read-light to thereby allow the second read-light to form a pair of correlation peaks representative of correlation of the image of the fingerprint of the specific individual and the image of the fingerprint of the arbitrary individual; correlation detecting means for detecting intensity of one of the pair of correlation peaks; and calculating means for comparing a value of the detected intensity with a predetermined threshold value so as to judge correlation of the image of the fingerprint of the specific individual and the image of the fingerprint of the arbitrary individual to thereby determine whether or not the arbitrary individual is identified with the specific individual, wherein at least one of said first and second spatial light modulating means includes an optically-addressable SLM which has an optically-addressing part for receiving an optical image and an modulation part having an optical characteristic, the optically-addressing part changing the optical characteristic of the modulation part dependently on the received optical image, the modulation part receiving and modulating read-light in accordance with the changed optical characteristic.
Claim 10
Dependent Claim
48 words
A fingerprint identification apparatus as claimed in claim 9, further comprising first reading means for irradiating light onto a finger of the arbitrary individual to obtain an optical image of the fingerprint of the arbitrary individual and for supplying the image to said first spatial light modulating means.
Claim 11
Dependent Claim
71 words
A fingerprint identification apparatus as claimed in claim 9 or 10, wherein information on the image of the fingerprint of the specific individual is stored in an external storing device separately provided from the fingerprint identification apparatus, further comprising second reading means for reading out the image of the fingerprint of the specific individual from the external storing device and for supplying the image to said first spatial light modulating means.
References Cited (Backward Citations)
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