Pattern recognition of human postures using the data density functional method

Shin Jhe Huang, Chi Jui Wu, Chien Chang Chen

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


In this paper, we propose a new approach to recognize the motional patterns of human postures by introducing the data density functional method. Under the framework of the proposed method, sensed time signals will be mapped into specific physical spaces. The most probable cluster number within the specific physical space can be determined according to the principle of energy stability. Then, each corresponding cluster boundary can be measured by searching for the local lowest energy level. Finally, the configuration of the clusters in the space will characterize the most probable states of the motional patterns. The direction of state migration and the corresponding transition region between these states then constitute a significant motional feature in the specific space. Differing from conventional methods, only a single tri-axial gravitational sensor was employed for data acquirement in our hardware scheme. By combining the motional feature and the sensor architecture as prior information, experimental results verified that the most probable states of the motional patterns can be successfully classified into four common human postures of daily life. Furthermore, error motions and noise only offer insignificant influences. Eventually, the proposed approach was applied on a simulation of turning-over situations, and the results show its potential on the issue of elderly and infant turning-over monitoring.

Original languageEnglish
Article number1615
JournalApplied Sciences (Switzerland)
Issue number9
StatePublished - 11 Sep 2018


  • Cluster boundary
  • Cluster number
  • Data density functional
  • Posture recognition
  • Tri-axial gravitational sensor


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