Dimensionality reduction strategies for the design of human machine interface signal classifiers

Lalit Gupta, Srinivas Kota, Swetha Murali, Dennis Molfese, Ravi Vaidyanathan

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


The goal in this paper is to overcome the dimensionality problem related to designing human-machineinterface (HMI) signal classifiers. The dimension is decreased by selecting a small set of linear combination of the input space features using the principal components transform (PCT) and the discrete cosine transform (DCT). Issues dealing with the selection of the basis vectors of the PCT and DCT for multi-class classification problems are addressed and four different classdependant ranking criteria are introduced to select basis vectors from the transformed training vectors in the PCT and DCT domains. The application and evaluation of the resulting PCT and DCT based multivariate classification strategies are demonstrated by classifying ear-pressure signals and event related potentials. The signals in these experiments are typical of control signals used in HMI applications and are also typical of those in which the dimensionality problem occurs. Based on the evaluations and comparisons, it is concluded that the PCT and the DCT based strategies developed in this paper offer viable solutions to overcome the dimensionality problem that frequently plagues the design of practical HMI signal classifiers.

Original languageEnglish (US)
Article number4811659
Pages (from-to)2432-2436
Number of pages5
JournalConference Proceedings - IEEE International Conference on Systems, Man and Cybernetics
StatePublished - 2008
Externally publishedYes
Event2008 IEEE International Conference on Systems, Man and Cybernetics, SMC 2008 - Singapore, Singapore
Duration: Oct 12 2008Oct 15 2008


  • Dimensionality reduction
  • Discrete cosine transform
  • Ear-pressure signals
  • Event related potentials
  • HMI signal classification
  • Principal components transform

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Control and Systems Engineering
  • Human-Computer Interaction


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