检索结果-南通市图书馆

Brief review of image denoising techniques

在线全文

学校读者我要写书评

暂无评论

Visual Computing for Industry,Biomedicine,and Art 2019年第1期2卷 55-66页

作者： Linwei Fan Fan zhang Hui Fan caiming zhang School of Software Shandong UniversityShunHua Road No.1500Jinan 250101China Shandong Co-Innovation Center of Future Intelligent Computing BinHai Road No.191Yantai 264005China Shandong Province Key Lab of Digital Media Technology Shandong University of Finance and EconomicsBicyclic East Road No.7366Jinan 250061China

With the explosion in the number of digital images taken every day,the demand for more accurate and visually pleasing images is ***,the images captured by modern cameras are inevitably degraded by noise,which leads to deteriorated visual image ***,work is required to reduce noise without losing image features(edges,corners,and other sharp structures).So far,researchers have already proposed various methods for decreasing *** method has its own advantages and *** this paper,we summarize some important research in the field of image ***,we give the formulation of the image denoising problem,and then we present several image denoising *** addition,we discuss the characteristics of these ***,we provide several promising directions for future research.

关键词： Image denoising Non-local means Sparse representation Low-rank Convolutional neural network

Study on blockchain technology from an information system perspective

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

High Technology Letters 2021年第2期27卷 146-152页

作者： zhang caiming Lu Yang Department of Labour Relations and Human Resourcing Management China University of Labour RelationsBeijing 100048P.R.China

Blockchain,as a decentralized platform and distributed ledger technology,will complement and promote the existing centralized system to form a relatively comprehensive ecosystem.A systematic review of blockchain research on information system(IS)disciplines during the five years from 2016 to 2020 selected dozens of papers from 16 leading IS *** technological characteristics and implementation models of blockchain are introduced,highlighting and discussing its research status and development in ***,the future research directions for blockchain in IS are *** aims to discuss the decentralized and emerging technology of blockchain in its early development stage and to depict the relevant IS issues that are worthy of further investigation.

关键词： information system(IS) business value,blockchain cryptocurrency Bitcoin supply chain management

Nonlocal image denoising using edge-based similarity metric and adaptive parameter selection

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2018年第4期61卷 253-261页

作者： Linwei FAN Xuemei LI Qiang GUO caiming zhang School of Computer Science and Technology Shandong University School of Computer Science and Technology Shandong University of Finance and Economics Shandong Provincial Key Laboratory of Digital Media Technology

Dear editor,We propose a nonlocal image denoising method with an edge-based similarity metric and adaptive parameter *** proposed denoising method uses a two-stage scheme to refine the denoising *** first produces the... 详细信息

关键词： Nonlocal image denoising using edge-based similarity metric and adaptive parameter selection Figure

Smooth fractal surfaces derived from bicubic rational fractal interpolation functions

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2018年第9期61卷 335-345页

作者： Fangxun BAO Xunxiang YAO Qinghua SUN Yunfeng zhang caiming zhang School of Mathematics Shandong University Faculty of Engineering and Information Technology University of Technology Sydney School of Computer Science & Technology Shandong University of Finance and Economics

Dear editor,Fractal geometry is an important and active branch of nonlinear *** has attracted more and more attention[1,2].As an important research field of fractal geometry,fractal interpola-

关键词： Rational Bi IFS Pi Smooth fractal surfaces derived from bicubic rational fractal interpolation functions FIS Figure

Salt and pepper noise removal in surveillance video based on low-rank matrix recovery

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Computational Visual Media 2015年第1期1卷 59-68页

作者： Yongxia zhang Yi Liu Xuemei Li caiming zhang School of Computer Science and Technology Shandong University Shandong University of Finance and Economics Shandong Provincial Key Laboratory of Digital Media Technology

This paper proposes a new algorithm based on low-rank matrix recovery to remove salt &pepper noise from surveillance video. Unlike single image denoising techniques, noise removal from video sequences aims to utilize both temporal and spatial information. By grouping neighboring frames based on similarities of the whole images in the temporal domain, we formulate the problem of removing salt &pepper noise from a video tracking sequence as a lowrank matrix recovery problem. The resulting nuclear norm and L1-norm related minimization problems can be efficiently solved by many recently developed methods. To determine the low-rank matrix, we use an averaging method based on other similar images. Our method can not only remove noise but also preserve edges and details. The performance of our proposed approach compares favorably to that of existing algorithms and gives better PSNR and SSIM results.

关键词： multimedia computing noise cancellation signal denoising sparse matrices video signal processing video surveillance

A nonlocal gradient concentration method for image smoothing

在线全文

学校读者我要写书评

暂无评论

Computational Visual Media 2015年第3期1卷 197-209页

作者： Qian Liu caiming zhang Qiang Guo Yuanfeng Zhou School of Computer Science and Technology Shandong University Shandong University of Finance and Economics Shandong Provincial Key Laboratory of Digital Media Technology

It is challenging to consistently smooth natural images, yet smoothing results determine the quality of a broad range of applications in computer vision. To achieve consistent smoothing, we propose a novel optimization model making use of the redundancy of natural images, by defining a nonlocal concentration regularization term on the gradient. This nonlocal constraint is carefully combined with a gradientsparsity constraint, allowing details throughout the whole image to be removed automatically in a datadriven manner. As variations in gradient between similar patches can be suppressed effectively, the new model has excellent edge preserving, detail removal,and visual consistency properties. Comparisons with state-of-the-art smoothing methods demonstrate the effectiveness of the new method. Several applications,including edge manipulation, image abstraction,detail magnification, and image resizing, show the applicability of the new method.

关键词： image smoothing nonlocal similarity L0 norm edge detection

益气温阳方治疗变应性鼻炎临床疗效Meta分析

在线全文

学校读者我要写书评

暂无评论

中医眼耳鼻喉杂志 2024年第2期14卷 79-82页

作者：杨祁安静娟杨焕张彩名南京中医药大学第二附属医院(江苏省第二中医院)耳鼻咽喉科江苏南京210017 南京市建邺区南苑社区卫生服务中心五官科江苏南京210019

目的系统全面地评价益气温阳方治疗变应性鼻炎的临床效果。方法利用个人计算机查询CNKI、万方、维普、Pubmed、Web of science数据库中的资料,再利NoteExpress软件对资料进行整理和筛选,使用Review Manager5.3软件对数据进行Meta分析。... 详细信息

目的系统全面地评价益气温阳方治疗变应性鼻炎的临床效果。方法利用个人计算机查询CNKI、万方、维普、Pubmed、Web of science数据库中的资料,再利NoteExpress软件对资料进行整理和筛选,使用Review Manager5.3软件对数据进行Meta分析。检索时间:数据库建库至今。纳入益气温阳方治疗变应性鼻炎临床疗效的随机对照试验,对纳入文献的总有效率、症状总评分(TNSS)、嗜酸性粒细胞(EOS)表达水平进行Meta分析。结果总共纳入5篇益气温阳方治疗变应性鼻炎的随机对照试验。益气温阳方治疗变应性鼻炎的总有效率[OR=5.25,95%CI:(2.98,9.24),P<0.00001]、症状总评分[MD=-1.51,95%CI:(-2.01,-1.01),P<0.00001]、嗜酸性粒细胞表达水平[MD=-5.12,95%CI:(-13.86,3.62),P=0.25]。结论益气温阳方能够改善变应性鼻炎患者的临床症状,提高治疗总有效率,具有更好的临床疗效。

关键词：益气温阳方变应性鼻炎临床疗效 Meta分析

High-resolution images based on directional fusion of gradient

在线全文

学校读者我要写书评

暂无评论

Computational Visual Media 2016年第1期2卷 31-43页

作者： Liqiong Wu Yepeng Liu Brekhna Ning Liu caiming zhang School of Computer Science and Technology Shandong University

This paper proposes a novel method for image magnification by exploiting the property that the intensity of an image varies along the direction of the gradient very quickly. It aims to maintain sharp edges and clear details. The proposed method first calculates the gradient of the low-resolution image by fitting a surface with quadratic polynomial precision. Then,bicubic interpolation is used to obtain initial gradients of the high-resolution(HR) image. The initial gradients are readjusted to find the constrained gradients of the HR image, according to spatial correlations between gradients within a local window. To generate an HR image with high precision, a linear surface weighted by the projection length in the gradient direction is constructed. Each pixel in the HR image is determined by the linear surface. Experimental results demonstrate that our method visually improves the quality of the magnified image. It particularly avoids making jagged edges and bluring during magnification.

关键词： high-resolution(HR) image magnification directional fusion gradient direction

Fast 2-D 8×8 discrete cosine transform algorithm for image coding

在线全文

学校读者我要写书评

暂无评论

Science in China(Series F) 2009年第2期52卷 215-225页

作者： JI XiuHua zhang caiming WANG JiaYe BOEY S. H. Fast 2-D 8×8 discrete cosine transform algorithmfor image coding1 School of Computer Science and Technology Shandong Economic University Jinan 250014 China School of Computer Science and Technology Shandong University Jinan 250061 China

A new fast two-dimension 8×8 discrete cosine transform （2D 8×8 DCT） algorithm based on the characteristics of the basic images of 2D DCT is presented. The new algorithm computes each DCT coefficient in turn more independently. Hence, the new algorithm is suitable for 2D DCT pruning algorithm of pruning away any number of high-frequency components of 2D DCT. The proposed pruning algorithm is more efficient than the existing pruning 2D DCT algorithms in terms of the number of arithmetic operations, especially the number of multiplications required in the computation.

关键词： discrete cosine transform basic image quantization image coding