检索结果-内蒙古大学图书馆

Canadian Conference on Electrical and Computer Engineering (CCECE)

作者： O. Fatemi S. Zhang S. Panchanathan Visual Computing and Communications Laboratory Department of Electrical Engineering University of Ottawa Ottawa ONT Canada

Cut detection is a fundamental operation for video sequence segmentation. This paper presents an optical flow based model with linear prediction to realize cut detection in various transition conditions. Each frame of a video sequence is divided into 4/spl times/4 non-overlapping blocks. This model initiates the cut detection by backward block searching for a match. Three continuous frames with the same matched block and the fourth predicted frame are grouped as a subsequence. The linearly predicted non-overlapping block locations in the fourth frame are defined as a cut detectable region. The forward search for a match is performed between the third and fourth frames in the cut detectable region. Mismatched blocks indicate a scene change in these block locations, namely, a cut. This algorithm has a better performance for detecting cuts in quick scene changes, static scenes, and scenes with slow motion compared to techniques reported in the literature.

关键词： Image motion analysis Layout Video sequences Motion detection Gunshot detection systems Detection algorithms Histograms Cameras Discrete cosine transforms Optical computing

来源：评论

学校读者我要写书评

暂无评论

VLSI implementation of discrete wavelet transform

VLSI implementation of discrete wavelet transform

引用

Annual IEEE International Conference and Exhibit ASIC

作者： A. Grzeszczak T.H. Yeap S. Panchanathan Visual Computing and Communications Laboratory Department of Electrical Engineering University of Ottawa Ottawa ONT Canada

This paper presents a VLSI implementation of discrete wavelet transform (DWT). The architecture is systolic in nature and performs both high-pass and low-pass coefficient calculations with only one set of multipliers, in contrast to the approaches presented in the literature. The architecture is simple, modular, and cascadable, and has been implemented in VLSI. Experimental results show that real-time coefficient calculation on a 512/spl times/512 monochrome video input can be achieved with 1.2 /spl mu/m technology.

关键词： Discrete wavelet transforms Very large scale integration Discrete cosine transforms Wavelet transforms Computer architecture Image coding Finite impulse response filter Video compression Image reconstruction Image processing

来源：评论

学校读者我要写书评

暂无评论

A lifting based system for optimal compression and classification in the JPEG2000 framework

A lifting based system for optimal compression and classific...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： G.F. Fahmy S. Panchanathan Visual Computing and Communications Laboratory Department of Computer Science and Engineering Arizona State University USA

In this paper, we propose a novel design for a lifting based system that achieves the optimal trade off between compression and classification performances. In addition, it can also achieve superior compression performance compared to existing wavelet kernels. The proposed system is based on bi-orthogonal filters and can operate in the JPEG2000 framework. Typically, in our proposed system the trade off point between compression and classification is automatically determined by the system. However, the user can also fine-tune the relative performance if required using two adjustors (one for compression and one for classification). Extensive simulations have been performed to demonstrate the efficiency of our system. Our simulation result shows that a 99% classification performance can be achieved at a comparable reconstruction quality whilst a superior compression performance over the JPEG2000 standard can be achieved at a classification rate of 70%.

关键词： Transform coding Image coding Filters Indexing Image reconstruction Decoding Signal design Laboratories Computer science Design engineering

来源：评论

学校读者我要写书评

暂无评论

Image/video indexing in the compressed domain

Image/video indexing in the compressed domain

引用

Canadian Conference on Electrical and Computer Engineering (CCECE)

作者： F. Idris S. Panchanathan Visual Computing and Communications Laboratory Department of Electrical Engineering University of Ottawa Ottawa ONT Canada

visual database systems require efficient indexing to enable fast access to the images and video sequences in the database. Since image and video data are voluminous, compression is essential for storage and transmission. The International Standards Organization has proposed the JPEG and MPEG standards for image and video compression, respectively. In order to avoid the unnecessary decompression and recompression operations in the searching process, it is efficient to index the image/video in compressed form. In this paper, we present image and video indexing techniques in the compressed domain.

关键词： Video compression Indexing Image coding Image storage Database systems Video sequences Image databases visual databases ISO Transform coding

来源：评论

学校读者我要写书评

暂无评论

A comparative evaluation of spatial scalability techniques in the compressed domain

A comparative evaluation of spatial scalability techniques i...

引用

Canadian Conference on Electrical and Computer Engineering (CCECE)

作者： Q. Hu S. Panchanathan Visual Computing and Communications Laboratory Department of Electrical Engineering University of Ottawa Ottawa ONT Canada

A comparative performance evaluation of DCT domain techniques for spatial scalability is presented. In contrast to the traditional spatial domain techniques, the DCT domain techniques remove the unnecessary decompression and recompression procedures, and thus have the advantages of reduced computational complexity and storage requirements. The relative performance is compared in terms of computational complexity and image quality.

关键词： Scalability Discrete cosine transforms Image coding Image resolution Computational complexity Video compression Spatial resolution Image storage Decoding Pixel

来源：评论

学校读者我要写书评

暂无评论

Real-time VLSI architecture for video compression

Real-time VLSI architecture for video compression

引用

Canadian Conference on Electrical and Computer Engineering (CCECE)

作者： O. Fatemi S. Panchanathan Visual Computing and Communications Laboratory Department of Electrical Engineering University of Ottawa Ottawa ONT Canada

Video compression is becoming increasingly important in several applications. Vector quantization (VQ) is a powerful technique for very low bit rate image/video compression and is an attractive technique for mobile multimedia applications. Adaptive VQ techniques provide an excellent coding performance at the expense of significant increases in computational complexity making real-time implementation difficult. We propose a VLSI chip-set design to implement a high performance cache based (adaptive) VQ (CVQ) technique using VHDL for real-time video compression.

关键词： Very large scale integration Video compression Image coding Computational complexity Computer architecture Software algorithms Algorithm design and analysis Vector quantization Bit rate Videoconference

来源：评论

学校读者我要写书评

暂无评论

User-interface for relative performance evaluation of compression techniques

User-interface for relative performance evaluation of compre...

引用

Canadian Conference on Electrical and Computer Engineering (CCECE)

作者： S. Padhy O. Hage S. Panchanathan Visual Computing and Communications Laboratory Department of Electrical and Computer Engineering University of Ottawa Ottawa ONT Canada

Several techniques for video compression have appeared in literature namely JPEG, MPEG, H.263, wavelet, vector quantization, sub-bands, etc. In this paper, we present a user interface design which allows subjective comparison by simultaneous display of the encoded sequences (along with the original) at a variety of compression ratios in a synchronized manner. The proposed interface is extremely useful for relative performance evaluation of various compression techniques and can be easily extended to incorporate evaluation of new compression techniques.

关键词： Image coding Transform coding Video compression Redundancy Signal to noise ratio Discrete cosine transforms Decoding Vector quantization User interfaces PSNR

来源：评论

学校读者我要写书评

暂无评论

Special issue — visual computing and communications

引用

Canadian Journal of Electrical and Computer Engineering 1998年第1-2期23卷 3-4页

作者： Sethuraman Panchanathan Visual Computing and Communications Laboratory Department of Computer Science and Engineering Arizona State University Tempe Arizona USA 85287-5406

Le traitement de l'information visuelle en communications devient de plus en plus important avec le développement des réseaux à large bande, de la technologie de l'image et du vidéo, des stations de travail et processeurs multimédia de haut de gamme, et des outils pour l'indexation, le furetage et l'archivage.

关键词： Multimedia communication visualization Streaming media Image coding Special issues and sections Transform coding

来源：评论

学校读者我要写书评

暂无评论

Indexing spatial content of still texture in MPEG-4

Indexing spatial content of still texture in MPEG-4

引用

European Signal Processing Conference (EUSIPCO)

作者： Jayank Bhalod V Mohammed Zubair S. Panchanathan Visual Computing and Communications Laboratory Department of Computer Science and Engineering Arizona State University Tempe - Arizona USA

There has been a rapid increase in audio-visual information in digital form with the ever-increasing popularity of the Internet. The Moving Pictures Expert Group has recently presented a video compression and content manipulation standard, called MPEG-4 [1]. This was developed in response to the growing need for a coding method that can facilitate access to visual objects in natural and synthetic moving pictures in a wide variety of applications. In this paper, we propose a method for indexing the spatial content of Still Texture in MPEG-4 Video. There has been a number of approaches proposed recently [1],[3],[5],[6], which address content based indexing using features such as, color, shape and/or texture. We note that the still texture information is encoded using Wavelet Transform in MPEG-4. Since still texture can have an arbitrary shape, we propose to employ a combination of shape, color and texture features. The shape features are derived from the alpha plane and represented using Cubic B-spline approximation. The color and texture features are extracted directly from the wavelet compressed domain. An important attribute of the proposed approach is also the introduction of the novel concept of “containment” of spatial features for content based indexing.

关键词： Shape Image color analysis Transform coding Indexing Splines (mathematics) Feature extraction Vectors

来源：评论

学校读者我要写书评

暂无评论

A hybrid technique for facial feature point detection

A hybrid technique for facial feature point detection

引用

IEEE Southwest Symposium on Image Analysis and Interpretation

作者： M. Gargesha S. Panchanathan Visual Computing and Communications Laboratory Department of Computer Science and Engineering Arizona State University Tempe AZ USA

ISBN: (纸本)0769515371

Existing techniques for facial feature point detection from color images include template matching, facial geometry and symmetry analysis, mathematical morphology, luminance and chrominance analysis, and PCA. However, these techniques are plagued by poor performance in the presence of scale variations. In this paper, a hybrid technique is proposed that employs a combination of the above approaches along with curvature analysis of the intensity surface of the face image in order to provide a superior performance with reduced computational complexity, even in the presence of scale variations.

关键词： Facial features Face detection Principal component analysis Image analysis Eyes Nose Computational complexity Image edge detection Image color analysis Performance analysis

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：