中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
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SPEAKER-AWARE SPEECH-TRANSFORMER 会议论文  OAI收割
新加坡, 2019-12-14
作者:  
Fan ZY(范志赟);  Li J(李杰);  Zhou SY(周世玉);  Xu B(徐波)
  |  收藏  |  浏览/下载:38/0  |  提交时间:2022/09/17
基于深度神经网络的说话人识别建模方法研究 学位论文  OAI收割
工学博士, 北京: 中国科学院研究生院, 2016
作者:  
张姗姗
收藏  |  浏览/下载:47/0  |  提交时间:2016/06/29
Lossless wavelet compression on medical image (EI CONFERENCE) 会议论文  OAI收割
4th International Conference on Photonics and Imaging in Biology and Medicine, September 3, 2005 - September 6, 2005, Tianjin, China
作者:  
Liu H.;  Liu H.;  Liu H.
收藏  |  浏览/下载:41/0  |  提交时间:2013/03/25
An increasing number of medical imagery is created directly in digital form. Such as Clinical image Archiving and Communication Systems (PACS). as well as telemedicine networks require the storage and transmission of this huge amount of medical image data. Efficient compression of these data is crucial. Several lossless and lossy techniques for the compression of the data have been proposed. Lossless techniques allow exact reconstruction of the original imagery while lossy techniques aim to achieve high compression ratios by allowing some acceptable degradation in the image. Lossless compression does not degrade the image  thus facilitating accurate diagnosis  of course at the expense of higher bit rates  i.e. lower compression ratios. Various methods both for lossy (irreversible) and lossless (reversible) image compression are proposed in the literature. The recent advances in the lossy compression techniques include different methods such as vector quantization  wavelet coding  neural networks  and fractal coding. Although these methods can achieve high compression ratios (of the order 50:1  or even more)  they do not allow reconstructing exactly the original version of the input data. Lossless compression techniques permit the perfect reconstruction of the original image  but the achievable compression ratios are only of the order 2:1  up to 4:1. In our paper  we use a kind of lifting scheme to generate truly loss-less non-linear integer-to-integer wavelet transforms. At the same time  we exploit the coding algorithm producing an embedded code has the property that the bits in the bit stream are generated in order of importance  so that all the low rate codes are included at the beginning of the bit stream. Typically  the encoding process stops when the target bit rate is met. Similarly  the decoder can interrupt the decoding process at any point in the bil stream  and still reconstruct the image. Therefore  a compression scheme generating an embedded code can start sending over the network the coarser version of the image first  and continues with the progressive transmission of the refinement details. Experimental results show that our method can get a perfect performance in compression ratio and reconstructive image.  
Experiment research for I/Q technology applied in accelerator phase detecting 期刊论文  OAI收割
HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS-CHINESE EDITION, 2005, 卷号: 29, 期号: 3, 页码: 312
Zhang, JB(张建兵); Wang, F(王芳); Wang, GW(王光伟)
收藏  |  浏览/下载:27/0  |  提交时间:2012/05/11
Experiment research for I/Q technology applied in accelerator phase detecting 期刊论文  OAI收割
HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS-CHINESE EDITION, 2005, 卷号: 29, 期号: 3, 页码: 312-315
作者:  
Zhang, JB;  Wang, F;  Wang GW(王光伟);  Wang, GW
收藏  |  浏览/下载:27/0  |  提交时间:2016/06/27
Duality in vector optimization in Banach spaces with generalized convexity 期刊论文  OAI收割
JOURNAL OF GLOBAL OPTIMIZATION, 2004, 卷号: 29, 期号: 4, 页码: 415-424
作者:  
Mishra, SK;  Giorgi, G;  Wang, SY
  |  收藏  |  浏览/下载:12/0  |  提交时间:2018/07/30