全文获取类型
收费全文 | 3293篇 |
免费 | 227篇 |
国内免费 | 205篇 |
专业分类
电工技术 | 53篇 |
综合类 | 88篇 |
化学工业 | 53篇 |
金属工艺 | 14篇 |
机械仪表 | 96篇 |
建筑科学 | 72篇 |
矿业工程 | 21篇 |
能源动力 | 29篇 |
轻工业 | 16篇 |
水利工程 | 5篇 |
石油天然气 | 12篇 |
武器工业 | 21篇 |
无线电 | 1077篇 |
一般工业技术 | 107篇 |
冶金工业 | 9篇 |
原子能技术 | 16篇 |
自动化技术 | 2036篇 |
出版年
2024年 | 5篇 |
2023年 | 28篇 |
2022年 | 49篇 |
2021年 | 65篇 |
2020年 | 62篇 |
2019年 | 24篇 |
2018年 | 37篇 |
2017年 | 83篇 |
2016年 | 121篇 |
2015年 | 127篇 |
2014年 | 227篇 |
2013年 | 217篇 |
2012年 | 209篇 |
2011年 | 225篇 |
2010年 | 149篇 |
2009年 | 199篇 |
2008年 | 204篇 |
2007年 | 246篇 |
2006年 | 198篇 |
2005年 | 202篇 |
2004年 | 212篇 |
2003年 | 178篇 |
2002年 | 132篇 |
2001年 | 93篇 |
2000年 | 88篇 |
1999年 | 85篇 |
1998年 | 57篇 |
1997年 | 53篇 |
1996年 | 25篇 |
1995年 | 36篇 |
1994年 | 27篇 |
1993年 | 18篇 |
1992年 | 13篇 |
1991年 | 8篇 |
1990年 | 3篇 |
1989年 | 5篇 |
1988年 | 7篇 |
1987年 | 1篇 |
1985年 | 3篇 |
1984年 | 1篇 |
1982年 | 2篇 |
1974年 | 1篇 |
排序方式: 共有3725条查询结果,搜索用时 0 毫秒
31.
C. Hermans C. Vanaken T. Mertens F. Van Reeth P. Bekaert 《Computer Graphics Forum》2008,27(2):281-290
Many video sequences consist of a locally dynamic background containing moving foreground subjects. In this paper we propose a novel way of re‐displaying these sequences, by giving the user control over a virtual camera frame. Based on video mosaicing, we first compute a static high quality background panorama. After segmenting and removing the foreground subjects from the original video, the remaining elements are merged into a dynamic background panorama, which seamlessly extends the original video footage. We then re‐display this augmented video by warping and cropping the panorama. The virtual camera can have an enlarged field‐of‐view and a controlled camera motion. Our technique is able to process videos with complex camera motions, reconstructing high quality panoramas without parallax artefacts, visible seams or blurring, while retaining repetitive dynamic elements. 相似文献
32.
In this paper we present a new practical camera characterization technique to improve color accuracy in high dynamic range (HDR) imaging. Camera characterization refers to the process of mapping device‐dependent signals, such as digital camera RAW images, into a well‐defined color space. This is a well‐understood process for low dynamic range (LDR) imaging and is part of most digital cameras — usually mapping from the raw camera signal to the sRGB or Adobe RGB color space. This paper presents an efficient and accurate characterization method for high dynamic range imaging that extends previous methods originally designed for LDR imaging. We demonstrate that our characterization method is very accurate even in unknown illumination conditions, effectively turning a digital camera into a measurement device that measures physically accurate radiance values — both in terms of luminance and color — rivaling more expensive measurement instruments. 相似文献
33.
We advocate the use of quickly‐adjustable, computer‐controlled color spectra in photography, lighting and displays. We present an optical relay system that allows mechanical or electronic color spectrum control and use it to modify a conventional camera and projector. We use a diffraction grating to disperse the rays into different colors, and introduce a mask (or LCD/DMD) in the optical path to modulate the spectrum. We analyze the trade‐offs and limitations of this design, and demonstrate its use in a camera, projector and light source. We propose applications such as adaptive color primaries, metamer detection, scene contrast enhancement, photographing fluorescent objects, and high dynamic range photography using spectrum modulation. 相似文献
34.
Automatic composition of broadcast sports video 总被引:1,自引:0,他引:1
This study examines an automatic broadcast soccer video composition system. The research is important as the ability to automatically
compose broadcast sports video will not only improve broadcast video generation efficiency, but also provides the possibility
to customize sports video broadcasting. We present a novel approach to the two major issues required in the system’s implementation,
specifically the camera view selection/switching module and the automatic replay generation module. In our implementation,
we use multi-modal framework to perform video content analysis, event and event boundary detection from the raw unedited main/sub-camera
captures. This framework explores the possible cues using mid-level representations to bridge the gap between low-level features
and high-level semantics. The video content analysis results are utilized for camera view selection/switching in the generated
video composition, and the event detection results and mid-level representations are used to generate replays which are automatically
inserted into the broadcast soccer video. Our experimental results are promising and found to be comparable to those generated
by broadcast professionals. 相似文献
35.
36.
朱莹 《数字社区&智能家居》2009,5(2):968-970
随着计算机网络的发展,在网络上进行视频直播变得越来越流行。然而目前的视频直播系统还存在着一定的问题。通过对视频直播系统架构的分析.提出了一个基于Web的视频直播系统的设计方案。 相似文献
37.
通过分析海明码的实现原理,设计一个基于海明码的视频7K印模型,并对诙模型进行程序验证。实验结果表明:基于海明码的视频水印方案能够有效提高7R印的可恢复性、顽健性、可升级性、适用性,但对视频面质有一定的影响。 相似文献
38.
基于混沌序列和扫描模式的视频加密算法的研究 总被引:1,自引:0,他引:1
李谦 《计算机应用与软件》2009,26(3)
提出了一种新的基于混沌序列和扫描模式的视频序列加密算法.该算法利用扫描模式通过对二维存储空间的不同访问方法来产生非常大的扫描路径或空间填充曲线,并使用正规语言来确定扫描模式.视频加密的过程通过求解视频序列中的相邻帧之间的差值矩阵,然后压缩该差值矩阵,最后再用扫描模式和混沌序列对该差值矩阵进行加密.基于混沌序列和扫描模式的置换和替代操作,组合成了具有良好密码特性的非线性耦合结构,而且在每次迭代过程中使用了密钥的融合操作,提高了加密算法的安全性.实验以Tennis等标准视频序列进行仿真,结果表明,该算法具有良好的加密安全性和效率. 相似文献
39.
40.
The content–user gap is the difference between the limited range of content-relevant preferences that may be expressed using
the MPEG-7 user interaction tools and the much wider range of metadata that may be represented using the MPEG-7 content tools.
One approach for closing this gap is to make the user and content metadata isomorphic by using the existing MPEG-7 content
tools to represent user (as well as content) metadata (Agius and Angelides 2006, 2007). Subsequently, user preferences may
be specified for all content, without omission. Since there is a wealth of user preference and history metadata within the
MPEG-7 user interaction tools that can usefully complement these specific content preferences, in this paper we develop a
method by which all user and content metadata may be bridged.
相似文献
Marios C. AngelidesEmail: |