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浏览/检索结果: 共10条，第1-10条 帮助 已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择发表日期升序发表日期降序作者升序作者降序提交时间升序提交时间降序题名升序题名降序 Measuring spatial disparity in accessibility with a multi-mode method based on park green spaces classification in Wuhan, China 期刊论文 APPLIED GEOGRAPHY, 2018, 卷号: 94 作者:  Xing, Lijun;  Liu, Yanfang;  Liu, Xingjian 收藏  |  浏览/下载：3/0  |  提交时间：2019/12/05 PGSs classification  Spacial disparity  The multi-modes method  Accessibility  Comparative analysis  Urban center in Wuhan   罗杰瑞教授与汉语史研究 期刊论文 2016, 2016 张光宇; CHANG Kuang-yu 收藏  |  浏览/下载：3/0 伦理学方法在经济学中的比较优势及其范式问题 期刊论文 2013 赵宏; 方建国 收藏  |  浏览/下载：1/0  |  提交时间：2016/05/17 伦理学方法  比较优势  范式问题  规范化  the method of ethics  comparative advantage  the problems of paradigm  normalization   中国CPI编制方法与国际《CPI手册》及美国之比较分析 期刊论文 2013 陈立双; 祝丹 收藏  |  浏览/下载：2/0  |  提交时间：2016/05/17 CPI  编制方法  比较分析  《CPI手册》  中国与美国  CPI's Compiling Method  Comparative Analysis  The CPI Manual  China and United States   A line mapping based automatic registration algorithm of infrared and visible images 会议论文 5th International Symposium on Photoelectronic Detection and Imaging (ISPDI) - Infrared Imaging and Applications, Beijing, June 25-27, 2013 作者:  Ai R(艾锐);  Shi ZL(史泽林);  Xu DJ(徐德江);  Zhang CS(张程硕) 收藏  |  浏览/下载：24/0  |  提交时间：2013/12/26 There exist complex gray mapping relationships among infrared and visible images because of the different imaging mechanisms. The difficulty of infrared and visible image registration is to find a reasonable similarity definition. In this paper, we develop a novel image similarity called implicit linesegment similarity(ILS) and a registration algorithm of infrared and visible images based on ILS. Essentially, the algorithm achieves image registration by aligning the corresponding line segment features in two images. First, we extract line segment features and record their coordinate positions in one of the images, and map these line segments into the second image based on the geometric transformation model. Then we iteratively maximize the degree of similarity between the line segment features and correspondence regions in the second image to obtain the model parameters. The advantage of doing this is no need directly measuring the gray similarity between the two images. We adopt a multi-resolution analysis method to calculate the model parameters from coarse to fine on Gaussian scale space. The geometric transformation parameters are finally obtained by the improved Powell algorithm. Comparative experiments demonstrate that the proposed algorithm can effectively achieve the automatic registration for infrared and visible images, and under considerable accuracy it makes a more significant improvement on computational efficiency and anti-noise ability than previously proposed algorithms.   A Local Image Enhancement Method Based on Adjacent Pixel Gray Order-preserving Principle 会议论文 5th International Symposium on Photoelectronic Detection and Imaging (ISPDI) - Infrared Imaging and Applications, Beijing, June 25-27, 2013 作者:  Fan XP(范晓鹏);  Cai TF(蔡铁峰);  Zhu F(朱枫) 收藏  |  浏览/下载：23/0  |  提交时间：2013/12/26 The paper is committed in local image enhancement. At first, the authors propose an adjacent pixel gray order-preserving principle. Adjacent pixel gray order-preserving principle is the basement of local enhancement method which ensures that there is no distortion in processed image. And then, the authors propose an iterative algorithm, which could stretch gray-scale difference of adjacent pixels in premise of not changing gray magnitude relationship between adjacent pixels. At last, the authors propose a totally reference image quality assessment method based on adjacent pixel gray order-preserving principle. According to this quality assessment method, the authors made a set of comparative experiments with local histogram equalization and method. Experimental results show that the proposed enhancement method can get higher score and provide better visual effects, fully demonstrating its effectiveness. According to this quality assessment method, the proposed method shows a good effectiveness, through experimental results and comparison with local histogram equalization method.   Information extraction from laser speckle patterns using wavelet entropy techniques (EI CONFERENCE) 会议论文 MIPPR 2011: Multispectral Image Acquisition, Processing, and Analysis, November 4, 2011 - November 6, 2011, Guilin, China Wang X.-J.; Li X.-Z.; Su S.-C. 收藏  |  浏览/下载：26/0  |  提交时间：2013/03/25 A novel speckle patterns processing method is presented using multi-scale wavelet techniques. Laser speckle patterns generated from the sample contained abundant information. In this paper  we propose a method using wavelet entropy techniques to analyze the speckle patterns and exact the information on the sample surface. In our case  we used this approach to test the solar silicon cell surface profiles based on the sym8 orthogonal wavelet family. According different wavelet entropy values  the micro-structure of different solar silicon cell surfaces were comparative analyzed. Furthermore  we studied the AFM and reflective spectra of the wafer. Results show that the wavelet entropy speckle processing method is effective and accurate. And the experiment proved that this method is a useful tool to investigate the surface profile quality. 2011 SPIE.   Multi-focus image fusion algorithm based on adaptive PCNN and wavelet transform (EI CONFERENCE) 会议论文 International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Imaging Detectors and Applications, May 24, 2011 - May 26, 2011, Beijing, China Wu Z.-G.; Wang M.-J.; Han G.-L. 收藏  |  浏览/下载：35/0  |  提交时间：2013/03/25 Being an efficient method of information fusion  image fusion has been used in many fields such as machine vision  medical diagnosis  military applications and remote sensing.In this paper  Pulse Coupled Neural Network (PCNN) is introduced in this research field for its interesting properties in image processing  including segmentation  target recognition et al.  and a novel algorithm based on PCNN and Wavelet Transform for Multi-focus image fusion is proposed. First  the two original images are decomposed by wavelet transform. Then  based on the PCNN  a fusion rule in the Wavelet domain is given. This algorithm uses the wavelet coefficient in each frequency domain as the linking strength  so that its value can be chosen adaptively. Wavelet coefficients map to the range of image gray-scale. The output threshold function attenuates to minimum gray over time. Then all pixels of image get the ignition. So  the output of PCNN in each iteration time is ignition wavelet coefficients of threshold strength in different time. At this moment  the sequences of ignition of wavelet coefficients represent ignition timing of each neuron. The ignition timing of PCNN in each neuron is mapped to corresponding image gray-scale range  which is a picture of ignition timing mapping. Then it can judge the targets in the neuron are obvious features or not obvious. The fusion coefficients are decided by the compare-selection operator with the firing time gradient maps and the fusion image is reconstructed by wavelet inverse transform. Furthermore  by this algorithm  the threshold adjusting constant is estimated by appointed iteration number. Furthermore  In order to sufficient reflect order of the firing time  the threshold adjusting constant is estimated by appointed iteration number. So after the iteration achieved  each of the wavelet coefficient is activated. In order to verify the effectiveness of proposed rules  the experiments upon Multi-focus image are done. Moreover  comparative results of evaluating fusion quality are listed. The experimental results show that the method can effectively enhance the edge details and improve the spatial resolution of the image. 2011 SPIE.   论“深摄结构”及相关问题 期刊论文 2010, 2010 张光宇; ZHANG Guang-yu 收藏  |  浏览/下载：3/0 Research on high precision membrane mirror forming method (EI CONFERENCE) 会议论文 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, April 26, 2010 - April 29, 2010, Dalian, China Liu C.-Y.; Jia J.-Q.; Jin G.; Zhong X.; Gu S. 收藏  |  浏览/下载：10/0  |  提交时间：2013/03/25 With the development of aeromechanics  large light reflector that satisfies the diffraction of light becomes the dominant object of the optical operator. The assumption of designing reflector with organic membrane with reflecting layer plated emerges as the times require. based on an analytical solution of Poisson's equation and careful analysis of forming method  the paper puts forward a conclusion that multi-electrode controlled electrostatic stretching membrane mirror is a better way than single-electrode controlled electrostatic stretching membrane mirror and also gives a preliminary comparative analysis of these two method. 2010 Copyright SPIE - The International Society for Optical Engineering.