Illumination-invariant and deformation-tolerant inner knuckle print recognition using portable devices

Xuemiao Xu, Qiang Jin, Le Zhou, Jing Qin, Tien Tsin Wong, Guoqiang Han

Research output: Journal article publicationJournal articleAcademic researchpeer-review

10 Citations (Scopus)


We propose a novel biometric recognition method that identifies the inner knuckle print (IKP). It is robust enough to confront uncontrolled lighting conditions, pose variations and low imaging quality. Such robustness is crucial for its application on portable devices equipped with consumer-level cameras. We achieve this robustness by two means. First, we propose a novel feature extraction scheme that highlights the salient structure and suppresses incorrect and/or unwanted features. The extracted IKP features retain simple geometry and morphology and reduce the interference of illumination. Second, to counteract the deformation induced by different hand orientations, we propose a novel structure-context descriptor based on local statistics. To our best knowledge, we are the first to simultaneously consider the illumination invariance and deformation tolerance for appearance-based low-resolution hand biometrics. Settings in previous works are more restrictive. They made strong assumptions either about the illumination condition or the restrictive hand orientation. Extensive experiments demonstrate that our method outperforms the state-of-the-art methods in terms of recognition accuracy, especially under uncontrolled lighting conditions and the flexible hand orientation requirement.
Original languageEnglish
Pages (from-to)4326-4352
Number of pages27
JournalSensors (Switzerland)
Issue number2
Publication statusPublished - 12 Feb 2015
Externally publishedYes


  • Deformation-tolerant matching
  • Illumination-invariant feature extraction
  • Inner knuckle print recognition

ASJC Scopus subject areas

  • Analytical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Biochemistry
  • Instrumentation
  • Electrical and Electronic Engineering

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