Spatial stimuli gradient sketch model

Joshin John Mathew, Alex Pappachen James

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


The inability of automated edge detection methods inspired from primal sketch models to accurately calculate object edges under the influence of pixel noise is an open problem. Extending the principles of image perception i.e. Weber-Fechner law, and Sheperd similarity law, we propose a new edge detection method and formulation that use perceived brightness and neighbourhood similarity calculations in the determination of robust object edges. The robustness of the detected edges is benchmark against Sobel, SIS, Kirsch, and Prewitt edge detection methods in an example face recognition problem showing statistically significant improvement in recognition accuracy and pixel noise tolerance.

Original languageEnglish
Article number7045586
Pages (from-to)1336-1339
Number of pages4
JournalIEEE Signal Processing Letters
Issue number9
Publication statusPublished - Sep 1 2015


  • Edge detection
  • local stimuli
  • perceived brightness
  • primal sketch model

ASJC Scopus subject areas

  • Signal Processing
  • Electrical and Electronic Engineering
  • Applied Mathematics

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