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关于∧-有序有界变差的定义
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作者 卢志康 方铭 《杭州师范学院学报》 1992年第6期7-10,共4页
本文指出了∧-有序有界变差函数族不同于∧-有界变差函数族的又一特性——不能给出相应的等价定义,取消了我们原先结果中的附加条件。
关键词 ∧-有界变差 ∧-有序有界 上确界
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基于有界变差函数的研究 被引量:2
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作者 包淑华 《廊坊师范学院学报(自然科学版)》 2011年第2期16-18,共3页
主要研究了函数的连续性与有界变差函数的关系及∧-有界变差函数与有界变差函数的联系。
关键词 连续性 有界函数 ∧-有界变差函数
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Image Distortion Metric Based on Total Bounded Variation 被引量:3
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作者 Cheng Xiaogang An Mingwei Chen Qimei 《China Communications》 SCIE CSCD 2012年第2期79-85,共7页
Image definition measurement plays an important role in various image processing applications.And a reliable objective image definition metrics is critical for evaluating the definition of the restored image.In this p... Image definition measurement plays an important role in various image processing applications.And a reliable objective image definition metrics is critical for evaluating the definition of the restored image.In this paper,a novel image distortion metric based on minimal Total Bounded Variation(TBV) is presented.It is clarified that when the restored image approximates to the original clear image,the smaller the TBV is,the better the definition of the restored image is.Furthermore,the difference between the restored image and the original clear image is the smallest when the TBV is minimum.In numerical results,the TBV of the original clear image,blur image and restored image are presented and compared,and the results demonstrate the validity of the distortion metric proposed. 展开更多
关键词 TBV image definition measurement image restoration evaluation function
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Regularity of discrete multisublinear fractional maximal functions 被引量:2
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作者 LIU Feng WU HuoXiong 《Science China Mathematics》 SCIE CSCD 2017年第8期1461-1476,共16页
We investigate the regularity properties of discrete multisublinear fractional maximal operators,both in the centered and uncentered versions.We prove that these operators are bounded and continuous from l^1(Z^d)... We investigate the regularity properties of discrete multisublinear fractional maximal operators,both in the centered and uncentered versions.We prove that these operators are bounded and continuous from l^1(Z^d)×l^1(Z^d)×…×l^1(Z^d)to BV(Z^d),where BV(Z^d)is the set of functions of bounded variation defined on Zd.Moreover,two pointwise estimates for the partial derivatives of discrete multisublinear fractional maximal functions are also given.As applications,we present the regularity properties for discrete fractional maximal operator,which are new even in the linear case. 展开更多
关键词 discrete multisublinear fractional maximal operator discrete fractional maximal operator bounded variation CONTINUITY
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Approximation by Modified Summation Integral Type Operators in the L_p Spaces 被引量:2
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作者 齐秋兰 郭顺生 李建坤 《Journal of Mathematical Research and Exposition》 CSCD 2009年第6期1069-1081,共13页
The generalized summation integral type operators with Beta basis functions are widely studied. At present, the investigations for the properties of these operators are only limited to the functions of bounded variati... The generalized summation integral type operators with Beta basis functions are widely studied. At present, the investigations for the properties of these operators are only limited to the functions of bounded variation. Some authors studied the rate of point-wise rate of convergence, asymptotic formula of Voronovskaja type, and some direct results about these type of operators. The present paper considers the direct, inverse and equivalence theorems of modified summation integral type operators in the Lp spaces. 展开更多
关键词 Beta operators K-FUNCTIONAL moduli of smoothness Riesz-Thorin interpolationtheorem H61der inequality.
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