Contemporary database technology is severely limited at managing high-dimensional data of many advanced applications, such as multimedia systems and data mining. The main concern of this paper is the well-known perfor...
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ISBN:
(纸本)0769510620
Contemporary database technology is severely limited at managing high-dimensional data of many advanced applications, such as multimedia systems and data mining. The main concern of this paper is the well-known performance degradation of multi-dimensional access methods in spaces with many dimensions. The paper proposes an elaborate storage organization, called the inverted space, which can support efficient processing of data in spaces with very high dimensionality. The organization allows system administrators to control the size of spatial indexes and, thereby, avoid the negative impact of extremely high data dimensionality on the retrieval performance. In addition, the paper introduces a new point access method designed To address numerous other problems that the contemporary retrieval schemes experience in high-dimensional situations. This mechanism is envisioned to serve as the core indexing structure of the inverted-space storage organizations.
The proceedings contain 85 papers. The topics discussed include: searching and filtering of audio-visual information: technologies, standards, and applications;dequantization bias for JPEG decompression;a probabilisti...
ISBN:
(纸本)0769505406
The proceedings contain 85 papers. The topics discussed include: searching and filtering of audio-visual information: technologies, standards, and applications;dequantization bias for JPEG decompression;a probabilistic image model for smoothing and compression;application specific image compression forvirtual conferencing;media-independent watermarking classification and the need for combining digital video and audio watermarking for media authentication;a spatial digital video watermark that survives MPEG;overview of interference cancellation for CDMA wireless systems;wireless multimedia communication through multichannel multipoint distribution service;advanced signal processing for wireless multimedia communications;simple collosion-secure fingerprinting schemes for images;and digital watermarking using inter-block correlation: extension to JPEG coded domain.
The authors propose a scalable video coding algorithm for low bit rate failure-free video transmission. In the failure-free video transmission, two channels are utilized to transmit the same video source. In the recei...
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Real-time video/visual communication applications require trade-offs in terms of processing speed, visual image quality and power consumption. Motion estimation is one of the tusks in video coding that requires signif...
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ISBN:
(纸本)0769510620
Real-time video/visual communication applications require trade-offs in terms of processing speed, visual image quality and power consumption. Motion estimation is one of the tusks in video coding that requires significant amount of computation. Block matching motion estimation algorithms such as the three-step search and the diamond search algorithms are currently being used in video coding schemes as alternatives to full search algorithms. Fast motion estimation algorithms reduce the computational complexity, at the expense of reduced performance. Special purpose fast processors can be employed as an alternative to meet the computational demand. However, the processing speed comes at the expense of higher power consumption. This paper investigates recently developed motion estimation algorithms and presents the computational, and performance trade-offs involved in choosing a motion estimation algorithm for video coding applications. Fast motion estimation algorithms often assume monotonic error surface in order to speed up the algorithm. The argument against this assumption is that the search might be trapped in local minima and may result in noisy motion field. Prediction methods have been suggested in the literature as a solution to avoid these local minima and noisy motion field. This paper also investigates the effects of the monotonic error surface assumption as well as the appropriate choice of initial motion vectors that results in better performance of the motion estimation algorithms.
The paper presents a rate-distortion (R-D) optimized 3D wavelet video coder by extending the concept of space-frequency quantization (SFQ) (Z. Xiong et al., 1997) from 2D to 3D. A lifting-based 3D (1T+2D) wavelet tran...
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Presents an algorithm for watermark insertion and extraction in a vector image. Most parts of the vector image consist of an array of coordinate values. First, the image is partitioned into blocks with the same area, ...
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