搜索结果: 151-165 共查到“知识库 信息处理技术”相关记录5928条 . 查询时间(2.24 秒)
基于Arnold变换的数字图像自适应隐写算法
隐写术 Arnold变换 系统参数 非满嵌
2016/7/13
以往的图像自适应隐写算法大多数以顺序满嵌的方式嵌入秘密信息，这类算法秘密信息的隐蔽性不够高，因此提出一种随机非满嵌算法。通过分析出图像的系统参数使图像的满嵌容量刚好大于秘密信息的长度让载体图像达到非满嵌，增强了隐写的灵活性，减少了载体图像的嵌入修改量。再使用Arnold变换对数据的嵌入顺序进行置乱，防止攻击者按顺序分析出秘密信息，使秘密信息的隐蔽性变高，进而提高了算法的安全性。实验结果表明本算法提...
伪距波动原因中的星体多径因素排除
信号质量监测 伪距波动 测距偏差 星体多径
2018/5/4
针对卫星可视弧段内伪距测量异常波动现象，从信号质量监测角度研究了卫星可视弧段内导航信号测距偏差变化问题，确认伪距波动是否由星体多径引起.利用大口径天线跟踪北斗卫星，采用两套采集设备实现了卫星可视弧段内的B1频点信号多次高载噪比采集，根据基于参考波形的测距偏差估计方法分别处理多组采集数据，获得了不同仰角上的测距偏差.在一个仰角下的采集数据，当滤波器带宽远远大于信号带宽时，采样率与下变频器均不同的两套...
针对带钢表面缺陷检测实时性要求高，采集的图像易受光照环境影响且缺陷特征弱等因素影响，提出一种基于谱残差视觉注意模型的带钢表面缺陷在线检测算法。首先，提出改进同态滤波方法对图像预处理，去除光照不均匀的影响，改善后续的分割结果。然后，构建谱残差视觉注意模型，通过对数频谱曲线差分得到缺陷显著图像。最后，提出加权马氏距离方法对显著图像阈值化增强，并利用连通区域标记法，标记出原带钢图像的缺陷位置。对提出的算...
基于被动毫米波成像特性，提出了改进的稀疏表示——圆周中心差（ISR-CSCD）算法来解决被动毫米波图像中弱小目标与背景区分度较弱，目标可提取特征较少的问题。该算法通过改进稀疏表示方法完成背景抑制与目标增强。依据目标与周围背景特征先验，提出了圆周中心差背景抑制算法对检测图像进行背景抑制。然后，融合改进稀疏表示方法和圆周中心差背景抑制算法的结果得到抑制了背景的目标增强图像。最后，基于恒虚警率的检测方法...
Scented Widgets: Improving Navigation Cues with Embedded Visualizations
Information visualization user interface toolkits information foraging social navigation social data analysis
2016/5/24
This paper presents scented widgets, graphical user interface controls enhanced with embedded visualizations that
facilitate navigation in information spaces. We describe design guidelines for adding...
Multiscale Shape and Detail Enhancement from Multi-light Image Collections
image enhancement NPR relighting shape depiction bilateral filter multiscale image processing
2016/5/24
We present a new image-based technique for enhancing the shape
and surface details of an object. The input to our system is a small
set of photographs taken from a fixed viewpoint, but under varying...
We present the ”Cartoon Animation Filter”, a simple filter that takes
an arbitrary input motion signal and modulates it in such a way that
the output motion is more ”alive” or ”animated”. The filter...
Parallax Photography: Creating 3D Cinematic Effects from Stills
Image-Based Rendering Photo and Image editing .
2016/5/24
We present an approach to convert a small portion of a light field
with extracted depth information into a cinematic effect with simulated,
smooth camera motion that exhibits a sense of 3D parallax....
CommentSpace: Structured Support for Collaborative Visual Analysis
Information visualization asynchronous collaboration social data analysis tagging
2016/5/24
Collaborative visual analysis tools can enhance sensemaking
by facilitating social interpretation and parallelization
of effort. These systems enable distributed exploration and
evidence gathering,...
Content-Based Tools for Editing Audio Stories
Audio editing storytelling transcript-based editing music browsing music retargeting
2016/5/24
Audio stories are an engaging form of communication that
combine speech and music into compelling narratives. Existing
audio editing tools force story producers to manipulate
speech and music track...
Depicting Stylized Materials with Vector Shade Trees
Material Depiction Artistic Guidelines Vector Graphics Shade Trees Gradient Mesh
2016/5/24
Vector graphics represent images with compact, editable and scalable
primitives. Skillful vector artists employ these primitives to
produce vivid depictions of material appearance and lighting. Howe...
Audio producers often use musical underlays to emphasize
key moments in spoken content and give listeners time to re-
flect on what was said. Yet, creating such underlays is timeconsuming
as produc...
Strategies for Crowdsourcing Social Data Analysis
Information Visualization Social Data Analysis Crowdsourcing
2016/5/24
Web-based social data analysis tools that rely on public discussion
to produce hypotheses or explanations of patterns
and trends in data rarely yield high-quality results in practice.
Crowdsourcing...
Capture-Time Feedback for Recording Scripted Narration
Voiceover narration speech emphasis audio
2016/5/24
Well-performed audio narrations are a hallmark of captivating
podcasts, explainer videos, radio stories, and movie trailers.
To record these narrations, professional voiceover actors
follow guideli...
Generating Emotionally Relevant Musical Scores for Audio Stories
Audio stories storytelling musical scores music retargeting
2016/5/24
Highly-produced audio stories often include musical scores
that reflect the emotions of the speech. Yet, creating effective
musical scores requires deep expertise in sound production
and is time-co...
