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A novel subtree partitioning algorithm for wavelet-based fractal image coding

A novel subtree partitioning algorithm for wavelet-based fra...

引用

International conference on Acoustics, Speech, and signal processing (ICASSP)

作者： I.M. Po Y. Zhang K.W. Cheung C.H. Cheung CityU Image Processing Laboratory Department of Electronic Engineering City University of Hong Kong Hong Kong China Department of Planning Developing & Importing Guangdong Posts and Telecommunications Guangzhou China

A novel wavelet subtree partitioning algorithm is proposed, which divides a subtree into scalar quantized wavelet coefficients and a fractal coded sub-subtree. Based on this new technique, a variable size wavelet subtree fractal coding scheme for still image compression is developed. Experimental results show that the new scheme can achieve a nearly optimal partition of the wavelet subtree with substantially computational reduction as compared with Davis' (see Proc. SPIE wavelet applications II, Orlando, vol.2491, p.141-152, 1995) scheme.

关键词： Partitioning algorithms Fractals image coding wavelet coefficients wavelet domain image processing Process planning Data structures Spatial resolution Frequency

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GATOR: An automatic multiple target tracking system

GATOR: An automatic multiple target tracking system

引用

SPIE conference on Acquisition, Pointing, and Tracking

作者： Wang, S Chen, G Knight, T ID Vis Inc Gainesville FL USA

ISBN: (纸本)0819428140

Tracking multiple targets in a cluttered environment using Eletro-Optical(EO) and Infrared (IR) imagery is Important to airborne video surveillance (AVS). However, existing systems often fail when a target encounters occlusion, changes in direction, or stops in transit. To counter this problem, a new software package named GATOR (Gazing Algorithms for Tracking Oriented Recognition) has been developed, which can automatically initiate, maintain, terminate, and reacquire tracking of multiple targets under these challenging conditions. The tracking performance of the system is measured by the Discriminative signal to Noise Ratio (DSNR) and the Peak Sharpness (PS). The system is implemented in C/C++. Using caches for memory addressing and pipeline programming, high speed processing and dynamic target handling are achieved simultaneously. Compared with other multiple target tracking systems, the distinguishing feature of GATOR is that it integrates a suite of tightly structured advanced computer vision algorithms to achieve very rugged performance and fast processing speed. The strength of the system resides in its ruggedness and automation, which is fundamental to many demanding applications such as video image exploitation for UAV (Unmanned Aerial Vehicle), border control, treaty enforcement, and other large area surveillance systems.

关键词： registration recognition tracking video neural networks wavelet

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Finding a suitable wavelet for image compression applications

Finding a suitable wavelet for image compression application...

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International conference on Acoustics, Speech, and signal processing (ICASSP)

作者： S. Masud J.V. McCanny DSiP Laboratories School of Electrical Engineering and Computer Science Queen''s University Belfast Ireland Queen's University Belfast Belfast Belfast GB

In this paper we assess the relative merits of various types of wavelet functions for use in a wide range of image compression scenarios. We have delineated different algorithmic criteria that can be used for wavelet evaluation. The assessment undertaken includes both algorithmic aspects (fidelity, perceptual quality) as well as suitability for real-time implementation in hardware. The results obtained indicate that of the wavelets studied the biorthogonal 9&7 taps wavelet is the most suitable from a compression perspective and that the Daubechies 8 taps gives best performance when assessed solely in terms of statistical measures.

关键词： image coding Distortion measurement wavelet analysis Filters Application software wavelet transforms image quality Quantization Transform coding PSNR

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A GenLOT-based progressive image coder for low resolution images

A GenLOT-based progressive image coder for low resolution im...

引用

IEEE International conference on image processing

作者： M. Helsingius T. Tran T. Nguyen Department of Electrical and Computer Engineering University of Wisconsin Madison WI USA

The popular EZW (embedded zerotree wavelet) and its improved version SPIHT (set partitioning in hierarchical trees) are high-performance progressive transmission image coders based on the wavelet transform which gives excellent compression results for images with significant low-frequency content. For images with high texture contents, the GenLOT-based coder outperforms SPIHT in PSNR measure by a wide margin. On the other hand, low bit rate video finds applications in videophone and surveillance systems, where smaller size image in QCIF format is often transmitted. We show that using the conventional zero-tree algorithm for the QCIF image is suboptimal and we propose several progressive algorithms with modified zero-tree structures. The extensive coding results using both the DCT and GenLOT transform confirms that our proposed modified zero-tree algorithm outperforms the conventional zerotree algorithm for QCIF-sized images.

关键词： image resolution image coding signal processing algorithms wavelet transforms Bit rate wavelet coefficients Data structures Statistics signal resolution signal processing

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Critically sampled wavelet representations for multidimensional signals with arbitrary regions of support

Critically sampled wavelet representations for multidimensio...

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International conference on Acoustics, Speech, and signal processing (ICASSP)

作者： J.G. Apostolopoulos J.S. Lim Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA USA

Transform/subband representations form an important element of many signal processing algorithms and applications. Until recently, representations have typically been designed for signals with convenient supports, e.g. 2-D signals with rectangular supports. However, a number of applications require representations for signals with arbitrary (non-rectangular) regions of support. We present a novel algorithm for creating critically sampled perfect reconstruction wavelet representations for signals defined over arbitrary supports. The proposed algorithm selects a subset of vectors from a convenient superset basis which under appropriate conditions provides a basis over the given arbitrary support. The algorithm can be interpreted as solving a corresponding sampling problem.

关键词： Multidimensional systems signal processing algorithms signal processing Multidimensional signal processing image reconstruction signal sampling Laboratories signal design image sampling Biomedical imaging

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VORTEX: video retrieval and tracking from compressed multimedia databases - affine transformation and occlusion invariant tracking from MPEG-2 video

VORTEX: video retrieval and tracking from compressed multime...

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7th Storage and Retrieval for image and Video Databases conference

作者： Schonfeld, D Lelescu, D Univ Illinois Dept EECS Signal & Image Res Lab Chicago IL 60680 USA

ISBN: (纸本)0819431273

In this paper, we present topics related to tracking of video objects in compressed video databases in the context of video retrieval applications. We developed a video retrieval and tracking system (VORTEX) to enable operation directly on compressed video data. The structure of the video compression standards is exploited in order to avoid the costly decompression operation. This is achieved by utilizing motion compensation-a critical prediction filter embedded in video compression standards-to estimate and interpolate the desired method for template matching. Occlusion analysis, filtering and motion analysis are used to implement fast tracking of objects of interest on the compressed video data. Being presented with a query in the form of template images of objects, the system operates on the compressed video in order to find the images or video sequences where those objects are present and their positions in the image. This enables the retrieval and display of the query-relevant sequences.

关键词： video retrieval compressed multimedia databases compressed domain processing motion analysis occlusion MPEG

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An embedded DCT-based still image coding algorithm

An embedded DCT-based still image coding algorithm

引用

International conference on Acoustics, Speech, and signal processing (ICASSP)

作者： D. Nister C. Christopoulos HF/ETX/PN/XML CLAB Ericsson Telecom AB Stockholm Sweden

An embedded DCT-based image coding algorithm is described. The decoder can cut the bitstream at any point and therefore reconstruct an image at lower rate. The quality of the reconstructed image at this lower rate would be the same as if the image was coded directly at that rate. The algorithm outperforms any other DCT-based coders published in the literature, including the JPEG algorithm. Moreover, our DCT-based embedded image coder gives results close to the best wavelet-based coders. The algorithm is very useful in various applications, like WWW, fast browsing of databases, etc.

关键词： image coding Discrete cosine transforms Transform coding Decoding wavelet transforms Frequency image reconstruction Quantization Bit rate Encoding

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wavelet based analysis of rotational motion in digital image sequences

Wavelet based analysis of rotational motion in digital image...

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International conference on Acoustics, Speech, and signal processing (ICASSP)

作者： Mingqi Kong J.-P. Leduc B.K. Ghosh J. Corbett V.M. Wickerhauser Department of Systems Science and Mathematics Washington University of Saint Louis Saint Louis MO USA Department of Mathematics Washington University of Saint Louis Saint Louis MO USA

This paper addresses the problem of estimating, analyzing and tracking objects moving with spatio-temporal rotational motion (spin or orbit). It is assumed that the digital signals of interest are acquired from a camera and structured as digital image sequences. The trajectories in the signal are two-dimensional spatial projections in time of motion taking place in a three-dimensional space. The purpose of this work is to focus on the rotational motion, i.e. estimate the angular velocity. In natural scenes, rotational motion usually composes with translational or accelerated motion on a trajectory. This paper shows that trajectory parameters and rotational motion can be efficiently estimated and tracked either simultaneously or separately. The final goal of this work is to provide selective reconstructions of moving objects of interest. This paper constructs new continuous wavelet transforms that can be tuned to both translational and rotational motion. The parameters of analysis that are taken into account in these rotational wavelet transforms are space and time position, velocity, spatial scale, angular orientation and angular velocity. The continuous wavelet functions are finally discretized for signal processing. The link between rotational motion, symmetry and critical sampling is also presented. applications are presented with tracking and estimation.

关键词： wavelet analysis image analysis image motion analysis Motion analysis Digital images Continuous wavelet transforms Motion estimation Tracking Angular velocity wavelet transforms

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Fast embedded video compression using cache-based zerotree processing

Fast embedded video compression using cache-based zerotree p...

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European signal processing conference (EUSIPCO)

作者： Charles D. Creusere Naval Air Warfare Center Weapons Division China Lake CA US

An embedded coding algorithm creates a compressed bit stream which can be truncated to produce reduced resolution versions of the original image. This property allows such algorithms to precisely achieve fixed bit rates, reducing or eliminating the need for rate control in video transmission applications. Unfortunately, a large amount of scratch memory is required for embedded coding, making it difficult for a cache-based processor to continuously operate at full speed. We address this problem in two steps. First, we partition the wavelet coefficients into separate groups and code them sequentially using the embedded zerotree wavelet algorithm. Next, we use information gathered in the first step to optimize the bit allocations for each partition. The changes to the allocation are transmitted to the decoder and applied to the next video frame.

关键词： Bit rate image coding Streaming media wavelet coefficients Decoding Resource management

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Approximate continuous wavelet transform with an application to noise reduction

Approximate continuous wavelet transform with an application...

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International conference on Acoustics, Speech, and signal processing (ICASSP)

作者： J.M. Lewis C.S. Burrus Electrical and Computer Engineering Department Rice University Houston TX USA

We describe a generalized scale-redundant wavelet transform which approximates a dense sampling of the continuous wavelet transform (CWT) in both time and scale. The dyadic scaling requirement of the usual wavelet transform is relaxed in favor of an approximate scaling relationship which in the case of a Gaussian scaling function is known to be asymptotically exact and irrational. This scheme yields an arbitrarily dense sampling of the scale axis in the limit. Similar behavior is observed for other scaling functions with no explicit analytic form. We investigate characteristics of the family of Lagrange interpolating filters (related to the Daubechies (1988) family of compactly-supported orthonormal wavelets), and finally present applications of the transform to denoising and edge detection.

关键词： wavelet transforms Noise reduction Continuous wavelet transforms Discrete wavelet transforms Multiresolution analysis Sampling methods Application software Filters image edge detection wavelet analysis

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