Chee-Way Chong

Learn More
By convention, the translation and scale invariant functions of Legendre moments are achieved by using a combination of the corresponding invariants of geometric moments. They can also be accomplished by normalizing the translated and/or scaled images using complex or geometric moments. However, the derivation of these functions is not based on Legendre(More)
Moment functions de0ned using a polar coordinate representation of the image space, such as radial moments and Zernike moments, are used in several recognition tasks requiring rotation invariance. However, this coordinate representation does not easily yield translation invariant functions, which are also widely sought after in pattern recognition(More)
The definition of pseudo-Zernike moments has a form of projection of the image intensity function onto the pseudo-Zernike polynomials, and they are defined using a polar coordinate representation of the image space. Hence, they are commonly used in recognition tasks requiring rotation invariance. However, this coordinate representation does not easily yield(More)
This paper details a comparative analysis on time taken by the present and proposed methods to compute the Zernike moments, Zpq. The present method comprises of Direct, Belkasim’s, Prata’s, Kintner’s and Coe3cient methods. We propose a new technique, denoted as q-recursive method, speci5cally for fast computation of Zernike moments. It uses radial(More)
F. Li,1 C. Chong,2,3,* J. Yang,1,† P. G. Kevrekidis,2 and C. Daraio3,4 1Aeronautics and Astronautics, University of Washington, Seattle, Washington 98195-2400, USA 2Department of Mathematics and Statistics, University of Massachusetts, Amherst, Massachusetts 01003-4515, USA 3Department of Mechanical and Process Engineering (D-MAVT), Swiss Federal Institute(More)
Feature descriptors for 3-D images have recently gained considerable attention in application for games, virtual reality environment and solid modeling. Numerous research had been introduced for 3-D invariants of geometric moments, complex moments and Zernike moments. In this paper, we present a theoretical framework to derive translation and scale(More)