Hamamatsu-photonics K.k.

Agency of Industrial Science and Technology

Naohisa Mukohzaka

Haruyoshi Toyoda

Tsutomu Hara

Yuji Kobayashi

Narihiro Yoshida

Seiichiro Mizuno

Kazuhiro Nakamura

Masatoshi Ishikawa

Tamiki Takemori

Hiroo Yamakawa

Terushige Hori

Yuuji Kobayashi

The analog-to-digital converter arrayincludes one analog-to-digital converterfor each row of photodetectorsin the photodetector array. The image-processing unitincludes the plurality of processing circuitsfor performing high-speed image processing. The signal convertercombines the output signals from the analog-to-digital converter arraywith output signals from the image-processing unit. Under control of the control circuitand the signal conversion controller, the signal converterdownconverts the composite signal at an important timing to a frame rate suitable for display on the monitorand subsequently displays the signal on the monitor

Camera system for high-speed image processing including selection of at least one frame based on processed results

The individual identification apparatus is provided for comparing a target pattern of an arbitrary person with a recorded reference pattern of a specific person, thereby judging whether the arbitrary person is the specific person. The apparatus has a calculation processing portion 60. In order to previously record a pattern of the specific person as a reference pattern, the portion 60 calculates correlations between the pattern of the specific person and comparative patterns which belong to other people. The portion 60 records the pattern of the specific person as a reference pattern only when the correlations between the pattern of the specific person and the comparative patterns are equal to or lower than a threshold. The portion 60 refuses to record, as a reference pattern, such a pattern that provides high correlations with regards to the other people's patterns and therefore that has a high similarity with regards to the other people's patterns. There is a small possibility that the apparatus will erroneously judge a match between an arbitrary person and the specific person when the arbitrary person is different from the specific person.

Individual identification apparatus for selectively recording a

The image pick up portion 50 picks up a pattern of a predetermined body portion of a specific individual a plurality of times and outputs a plurality of reference image signals for being stored. The image pick up portion 50 also picks up a pattern of the predetermined body portion of an arbitrary individual desired to be identified with the specific individual and outputs a target image signal. The calculation processing portion 60 electronically performs a Fourier transform on the plurality of reference image signals and the target image signal. The calculation processing portion 60 superimposes the Fourier transformed results of the plurality of reference image signals. The calculation processing portion electronically multiplies the thus superimposed reference image signals with the Fourier transformed target image signal. The calculation processing portion electronically performs an inverse Fourier transform on the multiplied results to thereby obtain a similarity degree between the reference image signals and the target image signal, thereby judging whether or not the arbitrary individual is the specific individual.

Individual identification apparatus based on frequency domain

The individual identification apparatus includes the image pick up portion 50 and the calculation processing portion 60. When recording information on a specific individual, the portion 50 picks up a pattern of a predetermined body portion of the specific individual and outputs a reference image signal. When desiring to identify an arbitrary person with the specific individual, the portion 50 picks up a pattern of a predetermined body portion of the arbitrary individual and outputs a target image signal. The portion 60 calculates a correlation signal between the reference image signal and the target image signal. That is, the portion 60 digitizes the reference image signal and the target image signal, electronically Fourier transforms those image signals, electronically multiplies the Fourier transformed images, and electronically inverse Fourier transforms the multiplied result to obtain the correlation signal. The portion 60 then judges, based on the correlation signal, whether the arbitrary person is the specific person.

Individual identification apparatus

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 resistivity of the photoconductive material dependently on the spatial distribution in the intensity of the received write light. A liquid crystal layer formed of liquid crystal molecules of nematic phase receives read light and presents birefringence with respect to the received read light. An electric voltage is applied through the photoconductive layer and the liquid crystal layer to thereby produce an electric field in the liquid crystal layer. The photoconductive layer changes the electric field produced in the liquid crystal layer in accordance with the resistivity of the photoconductive material so as to electrically control the birefringence of the liquid crystal molecules. The liquid crystal layer modulates the received read light in accordance with the birefringence which is electrically controlled in accordance with the spatial distribution in the intensity of the write light received by the photoconductive layer.

Phase-only optically-addressed type spatial light modulator

In an optical detector, a light source irradiates coherent light onto an objective. A Fourier transform lens receives the light diffracted and scattered at the objective and Fourier transforms the light to generate a Fourier image, the Fourier image having a high intensity spectral component corresponding to the periodic pattern on the objective and a low intensity spectral component corresponding to the abnormal portion. In an optically-addressed spatial light modulator, each of the optically-addressing part and the light modulating part receives the Fourier image at the corresponding portions. A threshold driving controller controls the spatial light modulator in its threshold operation so as to change a state in the light modulating part at a region where the high intensity spectral component of the Fourier image is incident while preventing the state from being changed in the light modulating part at a region where the low intensity spectral component of the Fourier image is incident, the changed state in the light modulating part modulating the high intensity spectral component of the Fourier image incident in the light modulating part. Thus, the modulated high intensity spectral component is separated from the unmodulated low intensity spectral component.

Optical detector employing an optically-addressed spatial light modulator

An optical associative memory in which processing data by optical operations permits simplification in circuit arrangement, a shorter processing time and the generation of successive outputs. The associative memory includes multiplying system for multiplying an input signal or a feedback signal, and a magnifying system for magnifying the input signal or said feedback signal. The associative memory also includes a first operational device for producing a first signal representing a product of the output of said multiplying system and the output of said magnifying system, a memory means for storing two-dimensional information and for outputting the content thereof as required, a second operational device for producing a product of the output of the memory means and the output of the multiplying system, an inversely multiplying system for inversely multiplying the output from said second operational device, a threshold memory for storing, while thresholding, the output from the the inversely multiplying system, and for outputting the content thereof as required and a feedback loop for feeding back the output of the threshold memory as the feed back signal.

Optical associative memory

An object is typically illuminated by laser light, and reflected light carrying a speckle pattern is amplified by an image intensifier. First and second speckle patterns representing the object before and after its deformation, respectively are written by double writing into a ferroelectric liquid crystal spatial light modulator (FLC-SLM). The double-written image is read out from the FLC-SLM, and converted by a Fourier transform optical system into an output optical image, i.e., Young's fringe. The output optical image is detected by a photoelectric converter, and analyzed by an image processing device to determine a deformation of the object.

Optical deformation measuring apparatus by double-writing speckle images

An optical associative memory produces an electrical correlation matrix pattern from an inputted electrical reference pattern and an electrical recall pattern, and converts the electrical correlation matrix pattern into a corresponding optical correlation matrix pattern, which is stored in a correlation matrix storage device. A reference pattern conversion device converts the electrical reference pattern into an optical reference pattern and a multiple image formation system converts the optical reference pattern to the other optical reference pattern. A pattern operation device produces an optical recall pattern by multiplying the optical correlation matrix pattern and the optical reference pattern. An inverse multiple image information system and a light receiving matrix convert the optical recall pattern into a corresponding electrical recall pattern, and the obtained electrical recall pattern is subjected to a thresholding operation. As a result, the recall pattern is obtained from the reference pattern after learning with a plurality of reference patterns through optical processing.

Optical associative memory employing an autocorrelation matrix

An opto-electric hybrid associative memory and corresponding storage and retrieval method employs a pair of spatial light modulators in tandem with polarization analyzer arrangements providing optical multiplication and employs multiple conversions between n.times.n matrices and n.sup.2 .times.n.sup.2 matrices, with the aid of a digital computer and a parallel analog processing circuit, to perform repetitive electrical correlation and conversion operations. Serial scanning of the optical patterns is avoided because the spatial light modulators employ photocathodes, microchannel plates and Pockels cells having back surfaces that are optically-reflective electrical-charge-storing surfaces of long retention capabilities. Repetitive cycling of reference patterns through the memory/method tend to restore missing portions of data.

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Hamamatsu, Japan

Naohisa Mukohzaka