检索结果-内蒙古大学图书馆

29th Picture coding Symposium (PCS)

作者： Haccius, Christopher Herfet, Thorsten Univ Saarland Intel Visual Comp Inst Telecommun Lab D-6600 Saarbrucken Germany

ISBN: (纸本)9781457720482

We present a model based coding (MBC) scheme which employs 3D scene information resulting in more efficient image coding. We propose a balancing between texture and difference, such that MBC is a dynamic enhancement to current standard image encoders: if no usable model data can be produced, all information remains in the difference, corresponding to standard encoding schemes. The higher the model quality, the more information can be transmitted. The result is an encoding scheme which offers at least the code rate of current encoders and additionally produces a 3D model.

关键词： model based coding Multiview Free Viewpoint 3D Data Fitting Texture Optimization

来源：评论

学校读者我要写书评

暂无评论

The clustered causal state algorithm - Efficient pattern discovery for lossy data-compression applications

引用

COMPUTING IN SCIENCE & ENGINEERING 2006年第5期8卷 59-67页

作者： Schmiedekamp, Mendel Subbu, Aparna Puoha, Shashi Penn State Univ Intelligent Control Dept Informat Sci & Technol Div Appl Res Lab University Pk PA 16802 USA

Pattern discovery is a potential boon for data compression, but current approaches are inefficient and produce cumbersome pattern descriptions. The clustered causal state algorithm is a new pattern-discovery algorithm... 详细信息

关键词： Pattern Analysis model based coding Statistical Pattern models Clustering Real Time Systems

来源：评论

学校读者我要写书评

暂无评论

Platelet-based coding of depth maps for the transmission of multiview images

Platelet-based coding of depth maps for the transmission of ...

引用

Conference on Stereoscopic Displays and Virtual Reality Systems XIII

作者： Morvan, Yannick de With, Peter H. N. Farin, Dirk Eindhoven Univ Technol POB 513 NL-5600 MB Eindhoven Netherlands LogicaCMG NL-5605 JB Eindhoven Netherlands

ISBN: (纸本)0819460958

Emerging 3-D displays show several views of the scene simultaneously. A direct transmission of a selection of these views is impractical., because various types of displays support a different number of views and the decoder has to interpolate the intermediate views. The transmission of multiview image information can be simplified by only transmitting the texture data for the central view and a corresponding depth map. Additional to the coding of the texture data, this technique requires the efficient coding of depth maps. Since the depth map represents the scene geometry and thereby covers the 3-D perception of the scene. sharp edges corresponding to object boundaries, should be preserved. We propose an algorithm that models depth maps using pieceivise-linear functions (platelets). To adapt to varying scene detail, we employ a quadtree decomposition that divides the image into blocks of variable size, each block being approximated by one platelet. In order to preserve sharp object boundaries, the support area of each platelet is adapted to the object boundary. The subdivision of the quadtree and the selection of the platelet type are optimized such that a global rate-distortion trade-off is realized. Experimental results show that the described method can improve the resulting picture quality after compression of depth maps by 1 - 3 dB when compared to a JPEG-2000 encoder.

关键词： depth image coding model based coding piecewise-linear function platelets-based coding

来源：评论

学校读者我要写书评

暂无评论

PCA/waveform hybrid coding for low bit rate transmission of face sequences

PCA/waveform hybrid coding for low bit rate transmission of ...

引用

Conference on Visual Communications and Image Processing 2005

作者： Hu, XJ Rao, KR Univ Texas Dept Elect Engn Arlington TX 76019 USA

ISBN: (纸本)0819459763

A novel model based and waveform based hybrid coding system aimed at very low bit rate coding of face images in video sequences is presented. The well known Principal Component Analysis (PCA) concept which is widely used for face recognition systems is adopted for model based coding, with modifications to cope with video compression. model failures and unknown objects are handled by waveform based coding employing conventional prediction/transform block-based coding scheme. The two coding modes are combined under rate-distortion framework, where Lagrangian cost function is used to determine the most efficient prediction for each block. Simulations show that the system can achieve high compression ratios while maintaining the robustness and generality, which indicates its potential use for videophone application.

关键词： model based coding Principal Component Analysis video compression

来源：评论

学校读者我要写书评

暂无评论

Object surface representation using occlusion analysis of spatiotemporal images

引用

IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS 1996年第6期E79D卷 764-771页

作者： Yasuno, T Suzuki, S Yasuda, Y Graduate School of Science and Engineering Waseda University Tokyo 169 Japan

Three dimensional model based coding methods are proposed as next generation image coding methods. These new representations need 3D reconstruction techniques. This paper presents a method that extracts the surfaces of static objects that occlude other objects from a spatiotemporal image captured with straight-line camera motion. We propose the concept of occlusion types and show that the occlusion types are restricted to only eight patterns. Furthermore, we show occlusion type pairs contain information that confirms the existence of surfaces. Occlusion information gives strong cues for segmentation and representation. The method can estimate not only the 3D positions of edge points but also the surfaces bounded by the edge points. We show that combinations of occlusion types contain information that can confirm surface existence. The method was tested successfully on real images by reconstructing flat and curved surfaces. Videos can be hierarchically structured with the method. The method makes various applications possible, such as object selective image communication and object selective video editing.

关键词： model based coding computer vision occlusion analysis spatiotemporal image surface reconstruction image segmentation video representation

来源：评论

学校读者我要写书评

暂无评论

Representation of dynamic 3D objects using the coaxial camera system

引用

IEICE TRANSACTIONS ON COMMUNICATIONS 1996年第10期E79B卷 1484-1490页

作者： Yasuno, T Ichimura, J Yasuda, Y WASEDA UNIV DEPT ELECT & COMMUN ENGN TOKYO 169 JAPAN

3D model-based coding methods that need 3D reconstruction techniques are proposed for nest-generation image coding methods. A method is presented that reconstructs 3D shapes of dynamic objects from image sequences captured using two cameras, thus avoiding the stereo correspondence problem. A coaxial camera system consisting of one moving and one static camera was developed. The optical axes of both cameras are precisely adjusted and have the same orientation using an optical system with true and half mirrors. The moving camera is moved alone a straight horizontal line. This method can reconstruct 3D shapes of static objects as well as dynamic objects using motion vectors calculated from the moving camera images and revised using the static camera image. The method was tested successfully on real images by reconstructing a moving human shape.

关键词： model based coding computer vision motion analysis surface reconstruction video representation

来源：评论

学校读者我要写书评

暂无评论

CURRENT STATUS OF THE MPEG-4 STANDARDIZATION EFFORT

CURRENT STATUS OF THE MPEG-4 STANDARDIZATION EFFORT

引用

Conference on Visual Communications and Image Processing 94

作者： ANASTASSIOU, D COLUMBIA UNIV DEPT ELECT ENGNNEW YORKNY 10027

ISBN: (纸本)081941638X

The Moving Pictures Experts Group (MPEG) of the International Standardization Organization has initiated a standardization effort, known as MPEG-4, addressing generic audiovisual coding at very low bit-rates (up to 64 kbits/s) with applications in videotelephony, mobile audiovisual communications, video database retrieval, computer games, video over Internet, remote sensing, etc. This paper gives a survey of the status of MPEG-4, including its planned schedule, and initial ideas about requirements and applications. A significant part of this paper is summarizing an incomplete draft version of a `requirements document' which presents specifications of desirable features on the video, audio, and system level of the forthcoming standard. Very low bit-rate coding algorithms are not described, because no endorsement of any particular algorithm, or class of algorithms, has yet been made by MPEG-4, and several seminars held concurrently with MPEG-4 meetings have not so far provided evidence that such high performance coding schemes are achievable.

关键词： LOW BIT RATE VIDEO coding MPEG model based coding OBJECT based coding

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：