Spatial interest pixels (SIPs): Useful low-level features of visual media data

Qi Li, Jieping Ye, Chandra Kambhamettu

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Visual media data such as an image is the raw data representation for many important applications. Reducing the dimensionality of raw visual media data is desirable since high dimensionality degrades not only the effectiveness but also the efficiency of visual recognition algorithms. We present a comparative study on spatial interest pixels (SIPs), including eight-way (a novel SIP detector), Harris, and Lucas-Kanade, whose extraction is considered as an important step in reducing the dimensionality of visual media data. With extensive case studies, we have shown the usefulness of SIPs as low-level features of visual media data. A class-preserving dimension reduction algorithm (using GSVD) is applied to further reduce the dimension of feature vectors based on SIPs. The experiments showed its superiority over PCA.

Original languageEnglish (US)
Pages (from-to)89-108
Number of pages20
JournalMultimedia Tools and Applications
Issue number1
StatePublished - Jul 2006


  • Dimensionreduction
  • Face recognition
  • Facial expression recognition
  • Low-levelfeatures
  • Spatial interest pixels

ASJC Scopus subject areas

  • Software
  • Media Technology
  • Hardware and Architecture
  • Computer Networks and Communications


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