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Bi-iteration SVD subspace tracking algorithms 总被引:3,自引:0,他引:3
We present a class of fast subspace tracking algorithms that arise from a straightforward extension of Bauer's (1957) classical bi-iteration to the sequential processing case. The bi-iteration concept has an unexpected potential in subspace tracking. Our new bi-SVD subspace trackers are well structured and show excellent convergence properties. They outperform the TQR-SVD subspace tracking algorithm. Detailed comparisons confirm our claims. An application to rank and data adaptive signal reconstruction is also discussed 相似文献
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N. Gašparović K. Strobach K. Meerbeck E. Flegler H. G. Schlitt K. E. Hagedorn S. Luckat H. W. Hahnemann T. Rákóczy Th. Finkbeiner 《Forschung im Ingenieurwesen》1974,40(3):101-104
Ohne Zusammenfassung
VDI 相似文献
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A summary is presented of a study on two-dimensional linear prediction models for image sequence processing and its application to change detection and scene coding. The study focused on two-dimensional joint process modeling of interframe relationships, the derivation of computationally efficient matching algorithms, and the implementation of a block-adaptive interframe predictor for use in interframe predictive coding and change detection. In the approach presented, the spatial nonstationarity is handled by an underlying quadtree segmentation structure. A maximum-likelihood criterion and a simpler minimum-variance criterion are discussed as detection and segmentation rules. The results of this research indicate that a constrained joint process model involving only a single gain parameter and a shift parameter is the best tradeoff between performance and computational complexity 相似文献
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We introduce a new sequential algorithm for tracking the principal subspace and, optionally, the r dominant eigenvalues and associated eigenvectors of an exponentially updated covariance matrix of dimension N×N, where N>r. The method is based on an updated orthonormal-square (QS) decomposition using the row-Householder reduction. This new subspace tracker reaches a dominant complexity of only 3Nr multiplications per time update for tracking the principal subspace, which is the lower bound in dominant complexity for an algorithm of this kind. The new method is completely reflection based. An updating of inverse matrices is not used. 相似文献
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Yang Sungwoo Strobach Elise Bierman David Zhao Lin Bhatia Bikram Wang Evelyn N. 《Journal of Porous Materials》2022,29(1):193-200
Journal of Porous Materials - An optically transparent and thermally insulating (OTTI) silica aerogel demonstrates promising results for various solar thermal applications, particularly... 相似文献
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A new type of scene adaptive coder has been developed. It involves a quadtree mean decomposition of the motion-compensated frame-to-frame difference signal followed by a scalar quantization of the local means. As a fundamental property, the new coding algorithm treats the displacement estimation problem and the quadtree construction problem as a unit. The displacement vector and the related quadtree are jointly optimized in order to minimize the direct frame-to-frame update information rate (in bits), which turns up as a new and more adequate cost function in displacement estimation. This guarantees the highest possible data compression ratio at a given quality threshold. Excellent results have been obtained for coding of color image sequences at a rate of 64 kb/s. The quadtree concept entails a much lower computational complexity compared to the conventional motion-compensated transform coder while achieving a subjective image quality that is as good or better than that of the traditional transform-based counterpart 相似文献
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Claus Franzke Jürgen Strobach und Werner Nauschütz 《Zeitschrift für Lebensmitteluntersuchung und -Forschung A》1969,140(4):199-203
Zusammenfassung In Milchfetten werden die homologe Reihe der geradzahligen -Ketofettsäuren mit 4 bis 18 C-Atomen sowie zusätzlich einige ungeradzahlige -Ketofettsäuren nachgewiesen und — außer den Vertretern mit 4 und 5 C-Atomen — bestimmt.
Frau R. Tschirnich sind wir für die tatkräftige Unterstützung bei den experimentellen Untersuchungen zu Dank verbunden. 相似文献
About the occurence and the content of -ketofatty-acids in milk lipids
Summary By use of a simple method the -keto-fatty acids in fresh milk of cows, goats and sheep were converted to corresponding methyl ketones. They were isolated along with the unsaponifiables and identified by paper chromatography as their dinitrophenyl hydrazones. After elution from the paper they were determined photometrically. In all milk lipids the homologous series of even-numbered -keto-fatty acids with 4 to 18 carbon atoms and also some odd-numbered -keto-fatty acids were identified and — with exception of the members with 4 and 5 carbon atoms-determined. The total amounts of -keto-fatty acids in all milk lipids ranged from 1-6,6 to 296,3 mg/kg, that is 0,02 to 0,03% of total fatty acids. 454,9 mg/kg total -keto-fatty acids were found in the colostrum of sheep, that is 0,045% of total fatty acids.
Frau R. Tschirnich sind wir für die tatkräftige Unterstützung bei den experimentellen Untersuchungen zu Dank verbunden. 相似文献