Yuji Takaki

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A numerical reconstruction method believed to be new is proposed for hybrid holographic microscopy in which the hologram of a microscopic object is recorded by an image sensor and is then reconstructed by a computer. Because the Fresnel-Kirchhoff integral must be used for numerical reconstruction to achieve high resolution, we propose an approximation(More)
The true image area that can be used for recording microscopic objects in hybrid holographic microscopy can be increased by elimination of the conjugate image and the zero-order image. We therefore added two shutters and one phase modulator to the electro-optical holographic recording system so that we could change the recording parameters and evaluate four(More)
One of the attractive features of hybrid holographic microscopy, in which the hologram of a microscopic object recorded by an image sensor is numerically reconstructed with a computer, is that the three-dimensional (3-D) information of a recorded object is obtained. The 3-D information has often been extracted by means of changing the reconstruction(More)
Incoherent pattern detection by a simple imaging system using a liquid-crystal active lens is proposed. The imaging system works as a spatial filtering system with a rewritable phase-only filter. We found that, in the incoherent matched filtering system, a conventional phase-only filter has a higher optical efficiency but a lower pattern discrimination than(More)
This paper proposes a parameter estimation method for ARMAX models based on the variational Bayesian method. In order to obtain the posterior distribution in an exact form, we convert the original estimation problem into another one in which the equation to be solved is linear in the unknown parameter by employing an artificial unknown parameter. Then the(More)
An electro-optical system is proposed to control a reconfigurable lens that is a combination of a physical lens and a two-dimensional liquid-crystal phase modulator. The functions of an imaging system employing the reconfigurable lens can be controlled by a change in the phase distribution of the modulator. A computer changes the phase distribution and(More)
Optical logic circuits using function/interconnection modules are needed for the construction of optical digital computers. Construction of function/interconnection modules by holographic techniques is proposed. Holographic function/interconnection modules do not require the complementary inputs that were needed for modules proposed previously. Moreover, a(More)
A computer-generated hologram consisting of N x N resolution cells produces a reconstructed image consisting of N x N sampling points. Since the width of the primary peaks in the point-spread function is twice the pitch of the sampling points, the intensity at intermediate points between the sampling points depends on the interference between the sampling(More)
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