Mr. Changli Wen Profile

Changli Wen

at National Univ of Defense Technology

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Publications (4)

Proceedings Article | 19 September 2013 Paper

The simulation of adaptive optical image even and pulse noise and research of image quality evaluation

Changli Wen, Yuannan Xu, Rong Xu, Changhai Liu, Tao Men, Wei Niu

Proceedings Volume 8905, 890508 (2013) https://doi.org/10.1117/12.2031727

KEYWORDS: Image quality, Image analysis, Adaptive optics, Error analysis, Optical telescopes, Optical simulations, Space telescopes, Astronomical engineering, Satellite imaging, Satellites

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As optical image becomes more and more important in adaptive optics area, and adaptive optical telescopes play a more and more important role in the detection system on the ground, and the images we get are so many that we need find a suitable method to choose good quality images automatically in order to save human power, people pay more and more attention in image’s evaluation methods and their characteristics. According to different image degradation model, the applicability of different image’s quality evaluation method will be different. Researchers have paid most attention in how to improve or build new method to evaluate degraded images. Now we should change our way to take some research in the models of degradation of images, the reasons of image degradation, and the relations among different degraded images and different image quality evaluation methods. In this paper, we build models of even noise and pulse noise based on their definition and get degraded images using these models, and we take research in six kinds of usual image quality evaluation methods such as square error method, sum of multi-power of grey scale method, entropy method, Fisher function method, Sobel method, and sum of grads method, and we make computer software for these methods to use easily to evaluate all kinds of images input. Then we evaluate the images’ qualities with different evaluation methods and analyze the results of six kinds of methods, and finally we get many important results. Such as the characteristics of every method for evaluating qualities of degraded images of even noise, the characteristics of every method for evaluating qualities of degraded images of pulse noise, and the best method to evaluate images which affected by tow kinds of noise both and the characteristics of this method. These results are important to image’s choosing automatically, and this will help we to manage the images we get through adaptive optical telescopes base on the ground.

Proceedings Article | 17 November 2010 Paper

Design and simulation of fast-pulse control signal generator for the electro-holographic optical switch

Yansheng Song, Jiarong Ji, Wenhua Dou, Changli Wen

Proceedings Volume 7847, 784720 (2010) https://doi.org/10.1117/12.869073

KEYWORDS: Optical switching, Signal generators, Crystals, Transistors, Switches, Refractive index, Kerr effect, Circuit switching, Optical interconnects, Capacitance

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Proceedings Article | 16 November 2010 Paper

The thermal analysis of polysiloxane rib waveguide

Changli Wen, Jiarong Ji, Xianghua Feng, Yansheng Song, Wenhua Dou

Proceedings Volume 7847, 784711 (2010) https://doi.org/10.1117/12.868934

KEYWORDS: Waveguides, Analytical research, Thermal analysis, Waveguide modes, Polymer multimode waveguides, Polymers, Thermal modeling, Convection, Finite element methods, Instrument modeling

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SPIE Journal Paper | 1 October 2010

Study on the forming of ionic grating in paraelectric potassium tantalate-niobate crystals at large modulation depths based on the finite element method

Yansheng Song, Jiarong Ji, Wenhua Dou, Changli Wen

OE, Vol. 49, Issue 10, 105801, (October 2010) https://doi.org/10.1117/12.10.1117/1.3490421

KEYWORDS: Crystals, Modulation, Potassium, Holography, Crystallography, Finite element methods, Refractive index, Nonlinear crystals, Electrons, Optical engineering

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