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排序方式： 共有198条查询结果，搜索用时 172 毫秒
1.
对小波图像去噪方法的探讨 总被引：2，自引：0，他引：2
小波图像去噪方法已广泛应用于图像去噪领域．在对日前小波图像去噪文献进行综合的基础上，描述了信号奇异性，并阐述了三种基于小波阈值去噪的方法，最后对小波去噪方法进行了一些展望． 相似文献
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BAO Liang-hua CHEN Lin-fei ZHAO Dao-mu 《浙江大学学报(A卷英文版)》2006,7(8):1431-1435
INTRODUCTION Recently, with the development of science andtechnology, more and more people become interestedin researching image encryption techniques. Manymethods have been proposed for optical image en-cryption. Random phase encoding methods and digi-tal holography techniques are effectively used inencrypting (Javidi and Nomura, 2000; Unnikrishnanet al., 2000a; Hennelly and Sheridan, 2003; Nishchalet al., 2004). Meantime some important properties oflight are used to realize encryptio… 相似文献
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Statistical and Fourier analysis methods of time series representing fluctuations of stock market in general and Indian stock markets in particular are well known. This work is motivated by a recent paper by Guharay [Operations Research and Financial Engineering, Princeton University, Princeton, NJ, preprint, 2002] where he has studied trends in the S & P 500 for various time periods using wavelet tools. Our paper deals with a few Indian and Saudi stock prices and return fluctuation for a certain period of time. The main objective of the analysis is to understand the dynamics of the Indian and Saudi stock markets. We look for similarities, point of abrupt changes, normalized data, return, volatility, graph, pure and noise part, correlation lengths, and signal-to-noise ratio. 相似文献
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《Communication monographs》2012,79(1):83-100
This study examined how advice givers' self-reported interaction goals influence recipients' evaluations of advice. A typology of giver goals was developed based on message production theories, and the influence of goal pursuit on evaluations of advice was analyzed in interactions between friends (N=189 dyads). In the structural equation model, several giver goals directly affected recipients' evaluations of specific advice features (e.g., greater effort to give efficacious and feasible advice resulted in ratings of advice as more efficacious and feasible). In turn, recipient evaluations of specific message features influenced their ratings of advice message quality. Advice giver goals of efficacy/feasibility, politeness, and novelty led to positive recipient ratings, whereas effort to change the recipient's mind led to negative evaluations. 相似文献
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This study examines the relationship between levels of psychological distress in substance-dependent mothers and their differential response to a dyadic parent–child intervention. A sample of 66 mothers who were receiving treatment for substance abuse, as well as a simultaneous parenting intervention, were interviewed pre and post-treatment on measures of psychological distress, adult and child trauma history, parental reflective functioning, and child social–emotional development. Additionally, clinicians provided assessments of the parent–child relationships. As anticipated, trauma histories for mothers and children, children's social emotional development, and parental reflective functioning were associated with aspects of maternal psychological distress. Kruskal–Wallis and subsequent Wilcoxson signed rank tests revealed that women with highest levels of baseline psychological distress showed significant improvements in psychological functioning post-treatment while women with moderately elevated levels of psychological distress did not. Women who were most distressed at baseline showed increased levels of parental reflective functioning post-treatment while women with moderate and lower levels of baseline psychological distress showed improvements on clinician-rated assessments of parent–child relationships. Chi Square analyses showed that parents who endorsed the highest levels of distress at baseline reported that their children's risk status regarding social–emotional development decreased post-treatment. Despite similarities in substance dependence, mothers in this sample had different needs and outcomes in the context of this parenting intervention due to variation in mental health. Given this variation, parenting interventions for substance-dependent mothers need to account for the individual differences in levels of psychological distress. 相似文献
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The purpose of this paper is to extract features from vibration signals measured from motors subjected to accelerated bearing fluting aging and to detect the effects of bearing fluting at each aging cycle of induction motors. This trending of bearing degradation is achieved by monitoring the changes in the vibration signals at various sub-band levels. This is accomplished by the application of wavelet transforms and multi-resolution analysis in order to extract information from selected frequency bands with minimum signal distortion. 相似文献
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图像去噪在图像处理中极其重要。本文就几种常用的图像去噪方法进行了详细的综述,阐述了各方法的理论原理以及其优缺点,同时也给出了其对同一副测试图像的去噪效果。 相似文献