The signature vector method is target pattern rotation-invariant but does not discriminate well against many other patterns with a similar vector but different shapes.
© 1989 Optical Society of America
Original Manuscript: January 23, 1988
Published: May 1, 1989
Per-Erik Danielsson, "Rotation-invariant digital pattern recognition using circular harmonic expansion: a comment," Appl. Opt. 28, 1613-1614 (1989)