I am studying the importance of phase in signal.Can anybody explain what is phase congruency ?

Also,I am confused between terms i.e. phase congruency and phase coherence. Whether phase congruency and phase coherence are one and the same or different


1 Answer 1


Phase congruency is where the phases of a quadrature filter responses at different scales are similar.

Some links:


  • Oppenheim, A. V., & Lim, J. S. (1981). The importance of phase in signals.
  • Kovesi, P. (1995). Image Features From Phase Congruency.
  • Kovesi, P. (1996). Invariant measures of image features from phase information.
  • Kovesi, P. (1997). Symmetry and asymmetry from local phase.
  • Kovesi, P. (1999). Image features from phase congruency.
  • Kovesi, P. (2002). Edges are not just steps.
  • Kovesi, P. (2003). Phase congruency detects corners and edges.
  • Morrone, M. C., & Burr, D. C. (1988). Feature detection in human vision: a phase-dependent energy model.
  • Morrone, M. C., & Owens, R. a. (1987). Feature detection from local energy.
  • Perona, P., & Malik, J. (1990). Detecting and Localizing Edges Composed of Steps, Peaks and Roofs.
  • Reisfeld, D. (1996). Constrained phase congruency: simultaneous detection of interest points and of their orientational scales.
  • Robbins, B., & Owens, R. (1997). 2D feature detection via local energy.
  • Venkatesh, S., & Owens, R. (1990). On the classification of image features.

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