K-SVD公司
不变(物理)
词典学习
奇异值分解
计算机科学
扩展(谓词逻辑)
模式识别(心理学)
算法
人工智能
稀疏逼近
数学
数学物理
程序设计语言
作者
Boris Mailhé,Sylvain Lesage,Rémi Gribonval,Frédéric Bimbot,Pierre Vandergheynst
出处
期刊:Le Centre pour la Communication Scientifique Directe - HAL - Diderot
日期:2008-08-25
被引量:21
摘要
Shift-invariant dictionaries are generated by taking all the possible shifts of a few short patterns. They are helpful to represent long signals where the same pattern can appear several times at different positions. We present an algorithm that learns shift invariant dictionaries from long training signals. This algorithm is an extension of K-SVD. It alternates a sparse decomposition step and a dictionary update step. The update is more difficult in the shift-invariant case because of occurrences of the same pattern that overlap. We propose and evaluate an unbiased extension of the method used in K-SVD, i.e. a method able to exactly retrieve the original dictionary in a noiseless case.
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