中国科学院机构知识库网格系统: 检索

How livelihood capital affects farmers' willingness to pay for farmland non-market value? Evidence from Jianghan Plain, China 期刊论文 OAI收割
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 2022, 页码: 13
作者: Yang, Xin; Sang, Yiming; Zhang, Anlu

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收藏 | 浏览/下载：34/0 | 提交时间：2022/09/21

Farmland non-market value Farmers Livelihood capital Willingness to pay (WTP) Qualitative comparative analysis method of fuzzy sets (fsQCA)

Combining the least cost path method with population genetic data and species distribution models to identify landscape connectivity during the late Quaternary in Himalayan hemlock SCI/SSCI论文 OAI收割
2015
作者: Yu H. B.; Zhang, Y. L.; Liu, L. S.; Qi, W.; Li, S. C.

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收藏 | 浏览/下载：92/0 | 提交时间：2017/11/09

Gene flow landscape genetics least cost path method phylogeography Quaternary species distribution models Tibetan Plateau pedicularis-longiflora orobanchaceae qinghai-tibetan plateau climate-change comparative phylogeography mitochondrial-dna adjacent regions dispersal routes migration rates alpine plants diversity

A line mapping based automatic registration algorithm of infrared and visible images 会议论文 OAI收割
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：42/0 | 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 OAI收割
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：48/0 | 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.

Leaf element concentrations of terrestrial plants across China are influenced by taxonomy and the environment 期刊论文 OAI收割
GLOBAL ECOLOGY AND BIOGEOGRAPHY, 2012, 卷号: 21, 期号: 8, 页码: 809-818
作者: Zhang, JL

收藏 | 浏览/下载：242/0 | 提交时间：2012/10/15

Biogeography China climate latitudinal gradient leaf element Mantel test phylogenetically comparative method taxonomy

Information extraction from laser speckle patterns using wavelet entropy techniques (EI CONFERENCE) 会议论文 OAI收割
MIPPR 2011: Multispectral Image Acquisition, Processing, and Analysis, November 4, 2011 - November 6, 2011, Guilin, China
作者: Li X.-Z.; Wang X.-J.

收藏 | 浏览/下载：44/0 | 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 OAI收割
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：88/0 | 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.

Spatial patterns of wood traits in China are controlled by phylogeny and the environment 期刊论文 OAI收割
GLOBAL ECOLOGY AND BIOGEOGRAPHY, 2011, 卷号: 20, 期号: 2, 页码: 241-250
Shi-Bao Zhang; J. W. Ferry Slik; Jiao-Lin Zhang; Kun-Fang Cao*

收藏 | 浏览/下载：34/0 | 提交时间：2012/03/13

China climate geographical variation phylogeny phylogenetically comparative method trees trait evolution wood properties

Research on high precision membrane mirror forming method (EI CONFERENCE) 会议论文 OAI收割
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：24/0 | 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.

Testing for Phylogenetic Signal in Comparative Data: Behavioral Traits Are More Labile 期刊论文 OAI收割
Evolution, 2003, 卷号: 57, 期号: 4, 页码: 717-745
作者: Simon P. Blomberg

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收藏 | 浏览/下载：15/0 | 提交时间：2017/07/26

Adaptation Behavior Body Size Branch Lengths Comparative Method Constraint Physiology.