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7428099 Optical security system using fourier plane encoding  
A method of verifying the authenticity of an object is disclosed. The method may include encoding a primary image, convolving the encoded primary image with a random code, generating thereby a...
7180672 Optical substrate and method of making  
An optical surface substrate. The optical substrate features a three-dimensional surface. The optical substrate is defined by a first surface structure function modulated by a second surface...
7130292 Optical processor enhanced receiver architecture (opera)  
A method and apparatus for enhancing the receiving and information identification functions of multiple access communications systems by employing one or more optical processors configured as a...
7095540 Optical security system using fourier plane encoding  
A method of verifying the authenticity of an object is presented. The method comprises providing a primary image; providing a secondary image; encoding the primary image; providing a random code;...
6862141 Optical substrate and method of making  
An optical surface substrate. The optical substrate features a three-dimensional surface having a correlation length of about 1 cm or less. The optical substrate is defined by a first surface...
6744909 Authentication system and method  
An authentication system using a correlator that correlates an input with a reference wherein at least one of the input and reference comprises a phase volume mask having structures, preferably...
6671053 Illumination measuring device  
In a method for influencing and measuring pulsed electromagnetic illumination, e.g. parallel laser light (L), said illumination or light can be spatially divided, in particular, in an...
6631017 Matched amplification and switch joint transform correlator  
A matched amplification correlator transforms input images projecting a real time hologram upon a holographic storage device and a spatial light modulator, optically coupled to the storage device,...
6570708 Image processing apparatus and method with locking feature  
An optical coherent processor or correlator for processing an input image produced by an imaging device illuminated by a coherent light source utilizes an optical key for preventing unauthorized...
6538791 Method and apparatus for real time optical correlation  
A system for performing real time optical comparisons using an optical correlator permits comparing a sampled image to a wide variety of reference images through the utilization of a multiple...
6424449 Optical information processing apparatus for image processing using a reflection type spatial light modulator  
A collimator optical system collimates light from the coherent light source. A reflection type spatial light modulator returns collimated light from the collimator optical system to the collimator...
6404535 Optically implemented wideband complex correlator using a multi-mode imaging device  
An optically implemented wide bandwidth correlation system ( 10 ) that employs a multi-mode imaging device ( 42 ) and a particular modulation format to provide both in-phase and quadrature phase...
6356381 Multi-wavelength cross-correlator for ultrashort radiation pulses  
In accordance with the present invention, a multi-wavelength cross-correlator for two radiation pulses is disclosed. In one embodiment, a method for operating the cross-correlator is disclosed. A...
6330361 Adaptively aligned optical correlator and method  
An improved optical correlator using a coherent light beam employs a method of adaptive alignment. A test pattern modulates an input spatial light modulator. The modulated beam propagates through...
6323972 Real-time analog creation of holographic fourier transform matched filters  
A method is disclosed by which filters are created optically in real time--and tested. This technique is made possible by recent advances in Charge Couple Detector (CCD) detector array technology....
6285474 Holographic recording method and filtering method  
A method and an apparatus capable of filtering based on desired spatial frequency characteristics without loss of Fourier spectrum frequency components, and of matched filtering of high recognition...
6185015 Compact planar optical correlator  
A planar optical correlator including at least first and second optical substrates (30, 32), through which light propagates by means of total internal reflection, at least first and second...
6163403 High output reflective optical correlator having a folded optical axis using grayscale spatial light modulators  
An optical correlator system having a plurality of both active and passive reflective optical components between a source of electromagnetic radiation, such a visible coherent light, and an output...
6160656 Method and apparatus for optical correlation recognition by time-integrated nonlinear detection  
Methods and apparatus are provided for the recognition of an optical signal that is encoded with a specified temporal pattern. Nonlinear optical interactions and time-integrating optical detectors...
6137601 Incoherent erasure joint transform correlator  
A holographic grating is written into a photorefractive erasable holographic member and a light beam having a first wavelength which includes the joint power spectrum of a pair of joint images to...
6111671 Match filters for a real time fingerprint sensor and verification system  
A real time fingerprint verification system includes a recording device and a verification device each having a fingerprint scanner for generating a flat, dimensionally undistorted, high contrast,...
6094499 Pattern collation apparatus  
A pattern collation apparatus is designed to identify a registration pattern and a collation pattern as identical patterns or not even with a rotation offset between the registration pattern and...
6080994 High output reflective optical correlator having a folded optical axis using ferro-electric liquid crystal spatial light modulators  
An optical correlator system having a plurality of both active and passive reflective optical components between a source of electromagnetic radiation, such a visible coherent light, and an output...
6055086 Method and apparatus for improved spatial light modulation  
A method and apparatus for modulating a light beam in an optical processing system is described. Preferably, an electrically-controlled polarizer unit and/or an analyzer unit are utilized in...
6038073 Optical information processing system  
A constituent unit for an optical information processing system comprises an input information displaying device, which one-dimensionally, two-dimensionally, or three-dimensionally displays...
6031607 System and method for inspecting pattern defect  
The invention is a pattern defect inspection system and method for improving the inspection speed, simplifying the system, and enlarging the inspection object, in which a correlation circuit (24)...
6002499 Real time fingerprint sensor and verification system  
A real time fingerprint verification system includes a recording device and a verification device each having a fingerprint scanner for generating a flat, dimensionally undistorted, high contrast,...
5943170 Adaptive or a priori filtering for detection of signals corrupted by noise  
A method for pattern recognition and localization using a joint transform correlator and joint transform correlator. The method includes providing a joint image of a reference image and an input...
5920430 Lensless joint transform optical correlator for precision industrial positioning systems  
A lensless joint transform correlator optically determines the relative position of two pinholes placed in parallel arms of a Mach-Zehnder interferometer. The Fraunhaufer diffraction patterns...
5903390 Two port nonlinear joint transform correlator  
An all optical photorefractive holographic joint transform correlator provides a first correlation plane output port using two-beam coupling, and a second correlation plane output port employing...
5883743 Vander-Lugt correlator converting to joint-transform correlator  
A module, capable of being mounted on a printed circuit board, containing optical components necessary for optical correlation and a unique folded light path technique for conversion from a Vander...
5872648 On-axis spatial light modulators and methods of use  
New on-axis, optically addressable spatial light modulators (SLMs) and methods of use are described. The new SLMs include a film of a photochromic material and a non-polarizing beam splitter...
5862258 Method for distinguishing between objects using mace filters  
A pair of matched filters describing a pre-selected category of objects is ade, each of the filters having a center located at a unique place in the filter. When incorporated into a MACE filter and...
5859728 Method and apparatus for improved spatial light modulation  
A method and apparatus for modulating a light beam in an optical processing system is described. Preferably, an electrically-controlled polarizer unit and/or an analyzer unit are utilized in...
5841907 Spatial integrating optical correlator for verifying the authenticity of a person, product or thing  
A method of verifying the authenticity of an object is disclosed employing a spatial integrating optical correlator. An unreadable and hence non-counterfeitable mask (e.g., a. complex mask or a...
5841489 Phase-only optically-addressed type spatial light modulator  
In a spatial light modulator of the present invention, a photoconductive layer formed of photoconductive material receives write light having a spatial distribution in its intensity and changes...
5815597 Binary encoding of gray scale nonlinear joint transform correlators  
A joint Fourier transform optical correlator is disclosed which can have varying degrees of nonlinearity and yet employ a readily available binary spatial light modulator for producing the...
5812303 Light amplitude modulation with neutral density filters  
A system and method for increasing the number of bits available for use in a video display system that includes at least one spatial light modulator. The system uses a wheel (30) of three colors,...
5754691 Normalization of data from holographic correlators  
A method is provided for normalizing correlation data from a holographic correlator. After a sequence of object image patterns are recorded in an angularly multiplexed hologram, the entire volume...
5737138 Optical waveguide device and method of making the same  
The present invention relates to an optical waveguide device, particularly a structure for positioning end faces of an optical waveguide and end faces of optical fibers with respect to each other,...
5724162 Optical correlator using spatial light modulator  
An optical correlator is disclosed that compares signals of interest agai selected reference signals stored in holograms both of which are imaged onto a spatial light modulator comprising electron...
5713364 Spectral volume microprobe analysis of materials  
An optical probe collects light responses from a specimen that selectively and preferentially emanates from a localized volume element within the sample, with illumination irradiance and collection...
5699449 Method and apparatus for implementation of neural networks for face recognition  
A method and apparatus for implementation of neural networks for face recognition is presented. A nonlinear filter or a nonlinear joint transform correlator (JTC) employs a supervised perceptron...
5675436 Optical image processor employing a nonlinear medium with active gain  
An optical image processor includes a nonlinear active gain medium for recording an interference pattern that corresponds to the Fourier transform of an input image or the multiplicative product of...
5671090 Methods and systems for analyzing data  
A method and system for searching for a given sequence in a data base having a multitude of reference sequences stored or identified therein. In accordance with this method, a light beam is...
5648872 Single lens joint transform correlator utilizing a fresnel zone plate signal  
An amplitude encoded lens function signal, similar to a zone plate, is formed in the transform plane of a chirp encoded joint transform correlator. CCD correlation spot light sensor is separated...
5627678 Fourier transform optical apparatus and optical information  
A Fourier transform optical apparatus for optically Fourier transforming an input image includes a spatial light modulator for displaying an input image, a light source for irradiating the input...
5619596 Method and apparatus for optical pattern recognition  
An object of the invention is to provide a method and a apparatus for optical pattern recognition capable of accurately comparing and identifying a reference image accurately at a real-time even...
5606457 High-speed optical image correlator  
An optical image correlator includes a photorefractive medium for recording an interference pattern that corresponds to the Fourier transform of an input image or the multiplicative product of the...
5604634 All optical nonlinear joint fourier transform correlator  
A fully parallel, self-aligning, nonlinear and all optical joint transform correlator utilizes a photorefractive four wave mixer positioned to record the joint transform spectrum interfering with a...
Matches 1 - 50 out of 237 1 2 3 4 5 >