%0 Conference Paper
%B Computer Vision and Pattern Recognition, 2008. CVPR 2008. IEEE Conference on
%D 2008
%T Approximate earth mover's distance in linear time
%A Shirdhonkar,S.
%A Jacobs, David W.
%K algorithm;normal
%K complexity;earth
%K complexity;image
%K constraint;Kantorovich-Rubinstein
%K continuity
%K distance;histograms;linear
%K distance;weighted
%K Euclidean
%K Holder
%K matching;wavelet
%K movers
%K problem;computational
%K TIME
%K transform;computational
%K transforms;
%K transshipment
%K wavelet
%X The earth moverpsilas distance (EMD) is an important perceptually meaningful metric for comparing histograms, but it suffers from high (O(N^{3} logN)) computational complexity. We present a novel linear time algorithm for approximating the EMD for low dimensional histograms using the sum of absolute values of the weighted wavelet coefficients of the difference histogram. EMD computation is a special case of the Kantorovich-Rubinstein transshipment problem, and we exploit the Holder continuity constraint in its dual form to convert it into a simple optimization problem with an explicit solution in the wavelet domain. We prove that the resulting wavelet EMD metric is equivalent to EMD, i.e. the ratio of the two is bounded. We also provide estimates for the bounds. The weighted wavelet transform can be computed in time linear in the number of histogram bins, while the comparison is about as fast as for normal Euclidean distance or chi^{2} statistic. We experimentally show that wavelet EMD is a good approximation to EMD, has similar performance, but requires much less computation.
%B Computer Vision and Pattern Recognition, 2008. CVPR 2008. IEEE Conference on
%P 1 - 8
%8 2008/06//
%G eng
%R 10.1109/CVPR.2008.4587662
%0 Conference Paper
%B Information Fusion, 2005 8th International Conference on
%D 2005
%T A new approach to image fusion based on cokriging
%A Memarsadeghi,N.
%A Le Moigne,J.
%A Mount, Dave
%A Morisette,J.
%K ALI;
%K analysis;
%K based
%K cokriging;
%K component
%K data;
%K forecasting
%K fusion
%K fusion;
%K geophysical
%K geostatistical
%K Hyperion
%K image
%K Interpolation
%K interpolation;
%K invasive
%K ISFS
%K method;
%K metrics;
%K PCA;
%K principal
%K processing;
%K project;
%K QUALITY
%K quantitative
%K remote
%K remotely
%K sensed
%K sensing;
%K sensor
%K sensors;
%K signal
%K species
%K system;
%K techniques;
%K transforms;
%K wavelet
%K wavelet-based
%X We consider the image fusion problem involving remotely sensed data. We introduce cokriging as a method to perform fusion. We investigate the advantages of fusing Hyperion with ALI. This evaluation is performed by comparing the classification of the fused data with that of input images and by calculating well-chosen quantitative fusion quality metrics. We consider the invasive species forecasting system (ISFS) project as our fusion application. The fusion of ALI with Hyperion data is studied using PCA and wavelet-based fusion. We then propose utilizing a geostatistical based interpolation method called cokriging as a new approach for image fusion.
%B Information Fusion, 2005 8th International Conference on
%V 1
%P 8 pp. - 8 pp.
%8 2005/07//
%G eng
%R 10.1109/ICIF.2005.1591912
%0 Conference Paper
%B Global Telecommunications Conference, 2004. GLOBECOM '04. IEEE
%D 2004
%T Dynamic distortion control for 3-D embedded wavelet video over multiuser OFDM networks
%A Su,Guan-Ming
%A Han,Zhu
%A M. Wu
%A Liu,K. J.R
%K 3D
%K 802.11a;
%K channels;
%K codec;
%K codecs;
%K communication;
%K control;
%K deviation;
%K distortion
%K diversity
%K diversity;
%K downlink
%K dynamic
%K embedded
%K fairness;
%K Frequency
%K IEEE
%K LAN;
%K maximal
%K minimax
%K minimization;
%K modulation;
%K multimedia
%K multiuser
%K OFDM
%K OFDM;
%K PSNR
%K rate
%K reception;
%K streaming;
%K systems;
%K techniques;
%K theory;
%K TIME
%K transforms;
%K video
%K video;
%K wavelet
%K wireless
%X In this paper, we propose a system to transmit multiple 3D embedded wavelet video programs over downlink multiuser OFDM. We consider the fairness among users and formulate the problem as minimizing the users' maximal distortion subject to power, rate, and subcarrier constraints. By exploring frequency, time, and multiuser diversity in OFDM and flexibility of the 3D embedded wavelet video codec, the proposed algorithm can achieve fair video qualities among all users. Compared to a scheme similar to the current multiuser OFDM standard (IEEE 802.11a), the proposed scheme outperforms it by 1-5 dB on the worst received PSNR among all users and has much smaller PSNR deviation.
%B Global Telecommunications Conference, 2004. GLOBECOM '04. IEEE
%V 2
%P 650 - 654 Vol.2 - 650 - 654 Vol.2
%8 2004/12/03/nov
%G eng
%R 10.1109/GLOCOM.2004.1378042