New algorithms for vector quantization

Irad Yavneh
Dept. of Computer Science
Technion - Israel Institute of Technology, Haifa 32000, Israel
irad@cs.technion.ac.il
Yair Koren

Vector quantization is the classical problem of representing continuum with only a finite number of representatives or representing an initially rich amount of discrete data with a lesser amount of representatives. This problem has numerous applications. The objective of achieving a quantization with minimal distortion leads to a hard non-convex optimization problem, typically with many local minima. The main problem is thus to find an initial approximation that is close to a ``good'' local minimum. Once such an approximation is found, the well-known Lloyd-Max iterative algorithm may be used to converge to the nearby a local minimum. In this talk we will describe the problem and present two new approaches to its approximate solution.