Invariance Improved Legendre Moments As Contour-Shape Descriptor

Abstract

A new shape descriptor based on improved Legendre moments, invariant to affine transformations and suitable as both contour and region-shape descriptor is proposed in this paper. The objective performance comparison of the improved Legendre descriptor with modified Zernike descriptor was carried out. The Average normalized modified retrieval rank (ANMRR) obtained on SQUID database for improved Legendre descriptor was 0.1673, and for modified Zernike descriptor was 0.3514, which depicts the better accuracy of the proposed technique. The subjective evaluation of the retrieval results of Legendre and Zernike descriptor also shows the better performance of the Legendre descriptor.