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3981562 |
Spatial filtering for error detection
Fourier transform imaging microscope for examining parts carrying repetitive stripe pattern having a source of light with means forming a slit through which the light passes. Means including the...
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3978317 |
Optical bar code reader
An optical reader including a plurality of fixed mirrors disposed on an imaginary circumference, a light source for emitting a light beam, a rotating mirror receiving the light beam from the light...
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3975711 |
Real time fingerprint recording terminal
A fingerprint optical sensor terminal is provided for use in the real time recording of an impression of a fingerprint pattern, the human finger being placed for the purpose at an input window...
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3972616 |
Apparatus for detecting the defects of the mask pattern using spatial filtering
Two kinds of light sources, one of which emits a coherent light and the other of which emits incoherent light, are provided. The coherent light and incoherent light respectively emitted from the...
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3968476 |
Spurious signal removal in optical processor fingerprint identification apparatus
An improved incoherent optical processor fingerprint identification apparatus employs a rotatable grating for inspecting the ridge orientations in a plurality of preselected finite sample areas of...
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3954337 |
Method and apparatus for determining the average size of apertures in an apertured member
The average aperture width in a small area of an apertured member, such as a shadow mask for a cathode-ray tube, is determined by passing a beam of substantially monochromatic light through an area...
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3947123 |
Coherent optical analyzer
Cells of a given type spread among an ensemble of cells of various types are identified and, if desired, counted. Coherent light is directed toward a monolayer of cells of various types. The light...
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3947128 |
Pattern comparison
A method and device for the comparison of patterns, and especially of fingerprints, making possible the identification of a given person. The device comprises means for projecting an incoherent...
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3944978 |
Electro-optical method and apparatus for making identifications
A reference diffraction pattern is generated by radiating an invariant physical characteristic such as a fingerprint with coherent light, this reference diffraction pattern being converted by a...
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3938663 |
Circuit for sorting currency
The system includes a counter for entering the quantity of a block of currency, commonly referred to as a strap, in terms of the number of bills contained within the strap. A detection circuit...
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3930735 |
Traffic survey system
This invention is of a traffic survey system in which an aerial photo survey transparency is first made of a significant survey area, for example, two kilometers square. The transparency is then...
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3924952 |
Arrangement and method for studying radiation by interferential spectrometry
An arrangement and a method for studying radiation by interferential spectrometry. The arrangement includes, starting from a light source, an interferometer-splitter for dividing the source into...
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3924947 |
Apparatus for preservation and identification of particles analyzed by flow-through apparatus
An apparatus for identifying particles in a liquid suspension with respect to certain measured characteristics and matching the actual particles captured on a suitable substrate or the like member...
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3922090 |
Method and apparatus for authenticating documents
A document authentication apparatus for optically scanning document paper to verify the presence of colored fibers in the paper and for indicating the authenticity of the document if a...
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3917402 |
Method and apparatus for collating patterns
A method and apparatus to collating patterns, which is capable of detecting non-overlapping portions of two or more patterns. The apparatus comprises a channel plate having a recovery time...
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3906520 |
Apparatus for producing a high contrast visible image from an object
A fibre-optic imaging block for producing a high contrast, visible image of an object. A common light entry/exit face of the block is illuminated with light which is totally internally reflected...
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3892491 |
Comparator, optical inspection
Two identical thin lenses are placed side by side and in the same plane ll above work being examined which is located at approximately the lenses focal length. Observer's eye is at a controlled...
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3891968 |
Coherent optical processor apparatus with improved fourier transform plane spatial filter
A line pattern or fingerprint ridge pattern identification apparatus employs coherent optical processing techniques wherein the line or ridge orientations and spacings in a plurality of preselected...
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3889056 |
VIDEO SIGNATURE DECODER AND COMPARATOR AND METHOD
Apparatus and method for decoding recorded encoded data for viewing and visual comparison with other matter on a television screen. The method comprises utilizing a multiple-array lens, otherwise...
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3888591 |
Image subtraction apparatus
A system for subtracting two object images is disclosed. The system includes encoding means for providing first and second encoded images, and filtering means for passing the first and second...
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3882462 |
Fingerprint recognition apparatus using non-coherent optical processing
Apparatus for fingerprint recognition is disclosed utilizing relatively simple and inexpensive non-coherent optical processing techniques wherein the fingerprint ridge line orientations in a...
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3879131 |
Photomask inspection by real time diffraction pattern analysis
A focused beam of laser light producing a spot smaller than the minimum size of any valid feature of the photomask pattern is swept in a raster over the pattern being inspected. The light...
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3876304 |
Phase reticle design
Disclosed is a reticle assembly readily adaptable for use in radiation sensitive paper security validation apparatus. A transparent lens containing thereon a plurality of evenly spaced parallel...
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3873813 |
CREDIT CARD
A credit card having a coating of a substance which when treated sufficiently permanently and irreversably changes from a first state having one characteristic of reflectivity for visible light...
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3873181 |
INFRARED CORRELATION METHOD USING THERMOCHROMICS HAVING A HYSTERESIS PROPERTY
Disclosed are methods and apparatus for recording and reproducing optical information in thermochromic materials; exemplary materials are the ternary halides, ternary chalcogenides, and certain...
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3869697 |
Pattern identifying systems
A system for identifying two-dimensional patterns. According to this system, a pattern which is to be identified is positioned at a reading location and a Fourier transformation image of the...
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3865488 |
FINGERPRINT DISPLAY SYSTEM UTILIZING A STORED FINGERPRINT
A ridge pattern, for example, a fingerprint, to be visually displayed, is applied to a material which stores the ridge pattern. The material is then placed under an edge illuminated glass plate....
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3864042 |
FINGERPRINT SCANNING SYSTEM
A method and apparatus for rapidly scanning the finger of an individual with a monochromatic beam of light and for producing an output in accordance with the light reflected by the finger which...
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3858977 |
OPTICAL INTERFERENCE AUTHENTICATING MEANS
An optical interference, authenticating means, comprising a substrate, and a filter composed of at least one optical interference layer having a known characteristic of spectral reflectance and a...
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3853403 |
COMPOUND OPTICAL-SENSOR SYSTEM FOR VISUALLY OBSERVING AND PHOTOELECTRICALLY SENSING CODED INDICIA
Apparatus for visually observing and photo-electrically sensing coded indicia on a document. A lens system is provided for imaging the coded indicia upon apertures in a mask wherein preselected...
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3851971 |
APPARATUS FOR TESTING THE AUTHENTICITY OF PAPER CURRENCY
Apparatus for testing the authenticity of sheet material, comprising an oscillator which is arranged to emit radiation oscillating at a pre-selected frequency, means for conveying the sheet...
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3818190 |
AUTHENTICATION OF ACCESS TO INFORMATION RECORDS
The invention provides an access control system for selectively granting access on presentation and authentication of a control card means, the control card means comprising a web means with...
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3814943 |
METHOD OF AND APPARATUS FOR ANALYSING PATTERNS AND INSPECTING OBJECTS
A method and apparatus for analysing two-dimensional patterns, particularly printed matter carried on sheet-like objects, and for inspecting such sheet-like objects to locate defects therein. The...
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3814520 |
METHOD OF, AND APPARATUS FOR GAUGING, INSPECTING OR MEASURING PHYSICAL PROPERTIES OF OBJECTS
An apparatus for gauging inspecting or measuring properties of objects and employing a detecting device receiving light from an image of the object which light is influenced in accordance with the...
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3809478 |
ANALYSIS AND REPRESENTATION OF THE SIZE, SHAPE AND ORIENTATION CHARACTERISTICS OF THE COMPONENTS OF A SYSTEM
The invention relates to a diffractrometer for analysing the geometrical characteristics of the components of a system. In such a diffractrometer the received diffraction pattern is filtered in...
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3809910 |
MICROFILM FRAME SELECTION CIRCUITRY
First and second photodetectors positioned within a bridge configuration are optically coupled to a control track of a roll of microfilm having optically readable control indicia positioned...
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3807859 |
INFORMATION INPUT SYSTEM USING HOLOGRAPHY
An identification card having six-digit numerical information is prepared which comprises six information unit or digit hologram areas arranged in a predetermined direction, each having a hologram...
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3804519 |
GROUP-OF-CURVES PATTERN IDENTIFICATION APPARATUS
A pattern of a group of curves, such as fingerprints, including noises or discontinuities is formed from a permanent magnet film magnetiized in a direction perpendicular to its surface. Disposed on...
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3802762 |
COHERENT OPTICAL MULTICHANNEL CORRELATOR
A coherent optical multichannel correlator for identifying an object to be investigated by permeating the object with a beam of coherent radiation which is received by a transformation element and...
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3801823 |
CREDIT CARD IDENTIFICATION DEVICE
A device is disclosed which is capable of determining whether a person using a credit card is the true owner of the card. The person places his hand on a surface of the device. Light radiation is...
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3797936 |
ELECTRONIC LOCKING SYSTEM
An opto-electronic locking system for an entry door which is provided with an optically encoded key. The key is decoded internally by a sensing device which translates the light code detected into...
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3795805 |
APPARATUS FOR TESTING A CREDIT CARD
Apparatus for testing a credit card having a coating of a substance which when treated sufficiently permanently and irreversably changes from a first state having one characteristic of reflectivity...
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3790280 |
SPATIAL FILTERING SYSTEM UTILIZING COMPENSATING ELEMENTS
A spatial filtering system for inspecting integrated circuit photomasks, and the like. The system includes a spatial filter comprising a matrix-like array of opaque regions on a transparent field,...
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3788749 |
IMAGE QUALITY RATING SYSTEM
The sharpness of definition of an image on film may be automatically determined by comparing an original image on film with a perturbation of the same image formed from the original image. Such...
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3785736 |
SMALL-SIZED OPTICAL CORRELATOR
The present invention relates to double-diffraction optical correlators. According to the invention there is provided a multi-channel optical correlator for shape recognition wherein the lenses and...
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3781109 |
DATA ENCODING AND DECODING APPARATUS AND METHOD
Apparatus and method or system for encoding and recording coded data, and retrieving the same by decoding and display thereof for direct viewing or for viewing on a screen. The method comprises...
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3781113 |
METHOD AND APPARATUS FOR PERSONAL IDENTIFICATION
A method and apparatus for creating an encoded fingerprint card which consists of a hologram of a fingerprint created by a main illuminating beam and a reference beam on a sensitive photographic...
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3779492 |
AUTOMATIC TARGET RECOGNITION SYSTEM
A coherent, optical signal processor for recognition of specific known targets at extremely high speeds, applying matched-filter techniques. A modified matched filter includes a pair of matched...
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3778166 |
BIPOLAR AREA CORRELATOR
An optical area correlator employing a cathode ray tube for producing an image of a scene illuminated with incoherent light. Light rays from the image of the scene pass through transparent regions...
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3776641 |
OPTICAL DIVIDER POINT ASSEMBLY FOR HARMONIC SPECTRUM ANALYSIS
An optical divider point assembly for harmonic spectrum analysis having a lindrical drum with one or more sets of spiral lines therearound, each set originating at a point and diverging in equal...
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