ChunKan Tao

Aperture masking interferometry research simulation

Aperture Masking Interferometry (AMI) is one of the high-resolution astronomical image observation technologies. It is also an important research way to the Optical Aperture Synthesis (OAS). The theory of OAS is simply introduced and AMI simulation method is raised. The mathematics model is built and the interferogram fringes are got. The aperture mask u-v coverage is discussed and one image reconstruction method is done. The reconstructed image result is got with CLEAN method. Shortcoming of this work is also referred and the future research work is mentioned at last.

Influence of multiple scattering on the image quality obtained with optical coherence microscopy

Optical coherence microcopy (OCM) is a new method for optical and near-infrared imaging of biological tissues. This method is based on the detection of least-back-scattering light that maintain coherence and has thus spend shortest time that its path-length difference (Delta) L falling within the coherence length Lc of the low-coherence source. This paper points out that there are also a special part of multiple scattering light which has the sufficient small part length differences (Delta) L falling within the coherence Lc. The effects of this part of multiple scattering light can be divided into two categories. One is nonlinear effects and the other is speckle effects.

New method of measuring photoelastic properties of optical materials by using laser heterodyne interferometry

Laser heterodyne interferometry is a kind of photoelectric phase measuring technique, it measures the optical path difference between the reference wavefront and the measured wavefront directly and needs not to deal with the interference figure. This technique can give very high phase measuring precision and can be used in dynamic optical phenomenon. This paper studies the basic principles of laser heterodyne interferometer, and the heterodyne interferometry has successfully been applied to the field of photoelastic properties of selected optical materials. A new method of measuring some parameters of photoelastic is presented. A device which brings atmosphere to bear on the optical materials has been developed to measure the change of refractive index at different pressures, and the relationship between the given pressure and the corresponding change of refractive index has been obtained through a series of experiments. Also, a careful analysis is given to the result of the experiments. At last, a feasible scheme is discussed on applying laser heterodyne interferometry to the measurement of refractive change.

Three-dimensional reconstruction of the cell microscopic image

At the optical processing domain, the three-dimension reconstruction of information is an important problem of research. At the last few years, the laser confocal scanning microscope (LCSM) system was researched and has been used successfully as advanced optical instrument in the biological and medical research range. This paper primarily research the 3-D image reconstruction of the cell using its 2-D section image formed by the laser confocal scanning microscopy. First, the paper rests on the LCSM system characteristic of forming image to analyze the image noise and remove it. Then we extract the information of 2-D section image edge, and we use these informations to reconstruct the 3-D image of cell surface by method of B-Spline.

Three dimensional image processing by mathematical morphology

3D image processing is an important problem of modern science and technology research. With the development of optical technology, the laser confocal scanning microscope (LCSM) system has been used successfully as advanced 3D image instrument in the medical research domain. This paper is primarily to discuss mathematical morphology method of processing 3D image combining with 3D cell image formed by LCSM system. Paper begins from 2D mathematical morphology and specializes various 3D mathematical morphology theories. It offers a series of mathematical morphology methods of 3D image processing about its various cases. At last we use these methods to process the 3D cell image formed by the laser confocal scanning microscope system.

Computer simulation of three-dimensional object parallel correlation pattern recognition

In this paper, computer simulation of 3D object parallel correlation pattern recognition has been done by using a bank of filters, the results show that a bank of filters is essential to pattern recognition. The reason that the experimental results are not satisfactory is analyzed.

Theory and computer simulation of the synthetic aperture microscope

In this paper, a principle of synthetic aperture microscope based on the synthetic aperture principle and inverse scattering imaging is described. The algorithm of inverse problem is introduced and the results of computer simulation are given.

Parallel processing technology in optical pattern recognition

This paper describes the application of parallel processing technique in optical pattern recognition. We present a multiplexing parallel processing system. A plane optical lenslet array is used to produce multiple paralled beam, which read out multiimage of object from LCLV. The parallel iterative algorithm is adopted to design the bank of eigenfunction filters. Multiplexing correlation results are processed and determined synthetically. At last the recognition results are provided.

Real-time weighting of Gaussian beam on synthetic aperture radar (SAR) signals

Based on the Gaussian cross-sections of laser beam, real-time weighting of Gaussian beam on synthetic aperture radar (SAR) range signals has performed. Sidelobe height of range point spread function of SAR processor is decreased efficiently and imaging quality is improved.

New design of the correlation filter for distortion-invariant optical pattern recognition

A new design of the correlation filter is proposed. The spectral iterative technique and the Fourier-Mellin descriptor are used in the filter design. Targets are detected by rotating this filter in the Fourier plane to determine points of constant intensity. The results of computer simulation show that distortion (translation, rotation, scale, and intensity) invariant pattern recognition can be achieved.