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Motion-compensated compression of 3D animation models

ELECTRONICS LETTERS 2001年第24期37卷 1445-1446页

作者： Ahn, JH Kim, CS Kuo, CCJ Ho, YS K JIST Puk Gu Kwangju 500712 South Korea Univ So Calif Los Angeles CA 90089 USA

A new algorithm is proposed to compress animated 3D mesh models. First, an input mesh model is partitioned into segments, and each segment is motion compensated from that of the previous time instance. Then. the motion residuals are effectively compressed by using a transform coding method. It is shown that the proposed algorithm yields a much higher compression ratio than the MPEG-4 codec.

关键词： 3D animation models image segmentation Signal processing theory Graphics techniques data compression animated 3D mesh models mesh segmentation inter-mesh coding compression algorithm image coding prediction theory motion-compensated compression motion compensation input mesh model partitioning transform coding method computer vision and image processing techniques transform coding image and video coding computer animation motion-compensated prediction

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Efficient SPIHT-based embedded colour image coding techniques

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ELECTRONICS LETTERS 2001年第15期37卷 951-952页

作者： Khan, E Ghanbari, M Univ Essex Dept Elect Syst Engn Colchester CO4 3SQ Essex England

Proposed are two novel composite spatial orientation trees for SPIHT-based colour image codecs to link wavelet coefficients of three colour planes together. The simulation results show the improved performance of the ... 详细信息

关键词： video codecs trees (mathematics) image and video coding image colour analysis colour image coding techniques image coding SPIHT-based image coding techniques colour image codecs wavelet coefficients colour planes set partitioning hierarchical trees Combinatorial mathematics Signal processing theory computer vision and image processing techniques composite spatial orientation trees

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Wavelet coding method using small block DCT

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ELECTRONICS LETTERS 2001年第10期37卷 627-629页

作者： Wang, J Zhang, WJ Yu, SY Shanghai Jiao Tong Univ Inst Image Commun & Informat Proc Shanghai 200030 Peoples R China

A novel wavelet image compression method is introduced. The method applies the small block discrete cosine transform to certain parts of the wavelet coefficients before quantisation and coding. Experiments show that t... 详细信息

关键词： wavelet transforms wavelet image compression method image and video coding small block discrete cosine transform data compression Integral transforms in numerical analysis wavelet coding method image coding wavelet coefficients quantisation (signal) quantisation complexity discrete cosine transforms Signal processing theory small block DCT computer vision and image processing techniques

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image sequence stabilisation based on Kalman filtering of frame positions

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ELECTRONICS LETTERS 2001年第20期37卷 1217-1219页

作者： Ertürk, S Univ Kocaeli Dept Elect & Telecommun Engn TR-41040 Izmit Turkey

An image sequence stabilisation system based on Kalman filtering of absolute frame displacements is reported. The stabiliser compensates for undesired fluctuations in the sequence by shifting image frames into smoothed positions obtained through the Kalman filter. The stabiliser operates in real-time, removing jitter while preserving desired gross camera displacements.

关键词： Optical, image and video signal processing Kalman filtering filtering theory Filtering methods in signal processing image sequence stabilisation image frames jitter gross camera displacements Kalman filters absolute frame displacements Signal processing theory frame positions computer vision and image processing techniques image sequences image recognition

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3-D vector radix algorithm for the 3-D new Mersenne number transform

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IEE PROCEEDINGS-vision image AND SIGNAL processing 2001年第2期148卷 115-125页

作者： Boussakta, S Alshibami, O Aziz, M Holt, AGJ Univ Leeds Sch Elect & Elect Engn Leeds LS2 9JT W Yorkshire England Univ Newcastle Upon Tyne Dept Elect & Elect Engn Newcastle Upon Tyne NE1 7RU Tyne & Wear England

Three-dimensional convolutions and correlations are used for three-dimensional image-processing applications. Their calculation involves extensive computation, which makes the use of fast transforms very advantageous. As the number of arithmetic operations is very large, the accumulation of rounding or truncation errors arising in the use of the fast Fourier and Hartley transforms tends to increase. Number theoretic transforms are calculated module an integer and hence they are not subject to these errors. Recently a one-dimensional transform called the new Mersenne number transform (NMNT) was introduced and applied successfully to the calculation of 1-D convolutions/correlations. Unlike other Mersenne number transforms, the NMNT can handle long data sequences and has fast algorithms. In the paper, the 1-D definitions are first extended to the 3-D case in detail for use in 3-D image processing applications. The concept and derivation of the 3-D vector radix algorithm is then introduced for the fast calculation of the 3-D NMNT. The proposed algorithm is found to offer substantial savings over the row-column approach in terms of arithmetic operations. Examples are given showing the validity of both transform and algorithm.

关键词： computational complexity 3D image processing fast algorithms digital arithmetic truncation errors row-column approach correlation methods fast transforms 1D convolutions/correlations convolution 3D NMNT three-dimensional correlation fast Fourier transforms computer vision and image processing techniques arithmetic operations 3D vector radix algorithm three-dimensional convolution 3D new Mersenne number transform Integral transforms in numerical analysis Optical, image and video signal processing image processing 3D image processing applications number theoretic transforms Digital arithmetic methods arithmetic complexity rounding errors long data sequences fast Hartley transforms Hartley transforms

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3D imaging and ranging by time-correlated single photon counting

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COMPUTING & CONTROL ENGINEERING JOURNAL 2001年第4期12卷 157-168页

作者： Wallace, AM Buller, GS Walker, AC Heriot Watt Univ Dept Elect & Comp Engn Edinburgh EH14 4AS Midlothian Scotland Heriot Watt Univ Dept Phys Edinburgh EH14 4AS Midlothian Scotland

3D imaging is an important tool for metrology and reverse engineering of components and structures in a wide variety of contexts, from automobile and aeroplane manufacture to the creative media and architectural surveying. In this article, we review briefly the principal methods in current use for 3D imaging, then present a new method for time of flight depth measurement, which is more accurate and sensitive than the current techniques. To illustrate its potential, we show a number of examples of 3D data acquired from both small and large objects, taking examples from cars, planes and archaeological artefacts.

关键词： Aerospace engineering computing metrology image sensors time-correlated single photon counting archaeology time of flight depth measurement Humanities computing Signal processing theory Spatial variables measurement creative media automobile manufacture 3D imaging laser ranging architectural surveying image processing Control technology and theory Civil and mechanical engineering computing reverse engineering aerospace industry 3D data acquisition automobile industry computer vision and image processing techniques Optical, image and video signal processing aeroplane manufacture Aerospace industry photons image sensors Automobile industry

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Fast and accurate snake model for object contour detection

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ELECTRONICS LETTERS 2001年第10期37卷 624-626页

作者： Lie, WN Chuang, CH Natl Chung Cheng Univ Dept Elect Engn Chiayi 621 Taiwan

A new scheme in which a snake model is used fnr object contour detection is proposed. By developing a no-search movement scheme, accepting the effective gradient vector flow field as the contracting force, and adjusting the weighting parameters automatically, an algorithm that is fast, less sensitive to initial contour conditions and accurate in approaching concave parts of an object boundary is obtained.

关键词： image recognition convergence concave parts effective gradient vector flow field fast snake model block pixel variation image recognition edge detection no-search movement scheme accurate snake model object contour detection contracting force vectors weighting parameters computer vision and image processing techniques computational complexity

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image scrambling through a fractional GF(qⁿ) composite domain

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ELECTRONICS LETTERS 2001年第11期37卷 685-687页

作者： Sun, YS Shyu, HC Chung Cheng Inst Technol Dept Elect Engn Tao Yuan Taiwan

A novel fractional GF(q(n)) composite domain (FGCD) for image scrambling applications is described. The FGCD scrambled image can be recovered using the appropriate keys without any knowledge of the original image info... 详细信息

关键词： image information image and video coding copy protection reversing performance computer vision and image processing techniques image coding FGCD scrambled image fractional GF(qn) composite domain Gaussian noise image scrambling Other topics in statistics

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Method for combating random geometric attack on image watermarking

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ELECTRONICS LETTERS 2001年第7期37卷 420-421页

作者： Agung, IW Sweeney, P Univ Surrey CCSR Guildford GU2 7XH Surrey England

A method for amending StirMark random geometric attacked watermarked images is introduced. The proposed scheme uses a reference image to identify the attacked pixels, then exchanges them For pixels from the original unwatermarked image. It is shown that the watermark can be successfully detected after the attacked image is corrected.

关键词： Optical, image and video signal processing StirMark copy protection image restoration image watermarking random geometric attack feature extraction pixels reference image computer vision and image processing techniques

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Real-time vehicle recognition using local feature extraction

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ELECTRONICS LETTERS 2001年第7期37卷 424-425页

作者： Hwang, W Ko, H Korea Univ Dept Elect Engn Sungbuk Ku Seoul 136701 South Korea

A novel feature extraction method based on local textures of image for real-time vehicle recognition tasks is proposed. In particular. feature vectors are extracted from judicious combinations of partitioning and overlapping image blocks with a view to reducing cardinality while retaining sufficient feature information for effective recognition. Experimental results are presented that show a reduction in computational load of 80% and robustness to illumination and noise can be achieved.

关键词： overlapping image blocks image recognition local feature extraction cardinality noise computational load local textures real-time vehicle recognition feature extraction image recognition partitioning illumination real-time systems image texture vehicles feature information computer vision and image processing techniques

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