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2005年05月24日

【期刊论文】LS曝光建模与仿真

徐之海

浙江大学学报,1997,31(6):813~822,-0001,():

-1年11月30日

摘要

本文对Ls照相机(Lens Shurrer Camera)的曝光特性进行了分析,并建立了动力学数学模型。运用CAD的手段t建立了对Ls程序曝光进行仿真设计的系统,并给出了运行实例。

曝光, 程序快门, 建模, 仿真

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2005年05月24日

【期刊论文】Light energy matching method in high-resolution image reconstruction

徐之海, Ling Wang, Zhihai Xu, Huajun Feng, and Ping Zhang

May 20, 2003 Vol. 1, No.5 CHINESE OPTICS LETTERS,-0001,():

-1年11月30日

摘要

Many approaches for high-resolution image reconstruction have been proposed in some literatures. One of the most commonly ways is to reconstruct a high-resolution image from a number of rotated and translated images with low resolution. In this process, the exposure difference among original images will decrease the quality of the reconstructed image. In order to remove the influence of the exposure difference, a light energy matching method is proposed in this paper. The theoretical analysis is illustrated in details. Experimental results show that the theoretical analysis is correct and the proposed method is valid.

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2005年05月24日

【期刊论文】Spectrum Illumination for 3--D Surface Imaging System

徐之海, XU Zhi-hai, FENG Hua-jun, LI Qi

Semiconductor Photonics Technology, 2001 (24): 71~75,-0001,():

-1年11月30日

摘要

A method using spectrum illumination to reconstruct 3--D object image is a new concept in the field of computer vision, The design of optical illumination system is crucial in this method. Several ways to achieve multi color spectrum illumination are discussed. A prism illumination system is designed by means of aligning symmetrically the prism at the mid wavelength (rid=1, 806 274) of light path and using reflection collimating lens, cylindrical expending lens and two optical shutters. The relations between deviation angles and light wavelengths are given, and some 3-D reconstruction results are presented.

3--D imaging, Spectrum illumination, Computer vision

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2005年05月24日

【期刊论文】Interline Image Revision Method for Electrical Image Stabilization

徐之海, Li Qi*, Xu Zhihai, Feng Huajun

Proc. of SPIE Vol. 5633,-0001,():

-1年11月30日

摘要

In avigation, navigation and other fields, electrical image stabilization technique (EIS) is applied widely. Recent research for electrical image stabilization is focused on motion vector estimation, which influences accuracy of image stabilization and its applicable scope directly, and pay less attention to the relation between image stabilization algorithm and structure character of image sensor. In fact, while image sensors are interline transfer CCD, 2D rigid motion model is not accurate enough for the image stabilization algorithm. There exist the displacement between the rows in a frame, for the different rows are exposed at different time. In order to compensate the interline displacement caused by the movement of the sensor both in horizontal and vertical direction, an image revision method based on correlation was put forward for the structure character of interline transfer CCD. During exposure of each frame, the motion of camera is along uniform direction and approximately even (otherwise it is beyond application scope of EIS), so it is feasible to revise image according to the displacement at the top and the bottom of image. Image sequence was acquired by telescope with function of optical image stabilization, and then was processed by electrical image stabilization algorithm. Experiment results showed that the image fidelity has been improved remarkably after image revision processing.

Image revision,, Electrical image stabilization,, Interline transfer CCD,, Rigid motion model,, Pechan prism system

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2005年05月24日

【期刊论文】LIP多重微区域分解算法扩展数字图像动态范围

徐之海, 何烽, 冯华君

光电工程,2004,31(6):66~69,-0001,():

-1年11月30日

摘要

CCD/CMOS图像传感器的饱和电流和背景噪音使得一次曝光很难超过60-80dB的动态范围。用LIP(Logarithmic image processing)模式将图像转换为灰色调函数,再将基于LIP模式的非线性多重微区域图像分解算法进行改进,可以适应不同亮度的单幅图像处理,提高了可分辨信息量和图像对比度,同时抑止了噪声。质量评价显示,该算法能将MOS 等级四的源图像提高到等级一。

对数图像处理, 图像分解, 动态范围, 数字图像

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    浙江大学,浙江

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