TY - GEN
T1 - Learning multilevel dictionaries for compressed sensing using discriminative clustering
AU - Thiagarajan, Jayaraman J.
AU - Ramamurthy, Karthikeyan Natesan
AU - Spanias, Andreas
AU - Nasiopoulos, Panos
PY - 2012
Y1 - 2012
N2 - The performance of sparse recovery using compressed measurements improves when dictionaries learned from training data are used in place of predefined dictionaries. In this paper, we propose to learn incoherent multilevel dictionaries using discriminative clustering in each level. To this end, we present the discriminative K-lines clustering that iterates between identifying the cluster centers and computing the discriminant directions. A scheme for computing representations using the proposed dictionary is also developed. Simulation results for compressed sensing using standard images demonstrate that incorporating incoherence in the dictionary results in improved recovery performance. Furthermore, we implement the proposed algorithms as part of a sparse representations toolbox for the J-DSP software package.
AB - The performance of sparse recovery using compressed measurements improves when dictionaries learned from training data are used in place of predefined dictionaries. In this paper, we propose to learn incoherent multilevel dictionaries using discriminative clustering in each level. To this end, we present the discriminative K-lines clustering that iterates between identifying the cluster centers and computing the discriminant directions. A scheme for computing representations using the proposed dictionary is also developed. Simulation results for compressed sensing using standard images demonstrate that incorporating incoherence in the dictionary results in improved recovery performance. Furthermore, we implement the proposed algorithms as part of a sparse representations toolbox for the J-DSP software package.
KW - Discriminative clustering
KW - compressed sensing
KW - incoherent dictionaries
KW - sparse representations
UR - http://www.scopus.com/inward/record.url?scp=84867178186&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84867178186&partnerID=8YFLogxK
U2 - 10.1109/IIH-MSP.2012.125
DO - 10.1109/IIH-MSP.2012.125
M3 - Conference contribution
AN - SCOPUS:84867178186
SN - 9780769547121
T3 - Proceedings of the 2012 8th International Conference on Intelligent Information Hiding and Multimedia Signal Processing, IIH-MSP 2012
SP - 494
EP - 497
BT - Proceedings of the 2012 8th International Conference on Intelligent Information Hiding and Multimedia Signal Processing, IIH-MSP 2012
PB - IEEE Computer Society
T2 - 2012 8th International Conference on Intelligent Information Hiding and Multimedia Signal Processing, IIH-MSP 2012
Y2 - 18 July 2012 through 20 July 2012
ER -