# Events

Maseeh Colloquium: The Mathematics behind Bar Codes

Friday, April 5, 2013 - 3:15pm

The Maseeh Mathematics and Statistics Colloquium Series* presents

**The Mathematics behind Bar Codes**

by Fadil Santosa, Ph.D., Institute for Mathematics and its Applications, University of Minnesota

Neuberger Hall room 454 | Portland State University

(Refreshments served at 2:45 in NH 344)

* Sponsored by the Maseeh Mathematics and Statistics Colloquium Series Fund and the Fariborz Maseeh Department of Mathematics & Statistics, PSU. This event is free and open to the public.

**Friday, April 5, 2013****3:15PM - 4:30PM**Neuberger Hall room 454 | Portland State University

(Refreshments served at 2:45 in NH 344)

* Sponsored by the Maseeh Mathematics and Statistics Colloquium Series Fund and the Fariborz Maseeh Department of Mathematics & Statistics, PSU. This event is free and open to the public.

ABSTRACT

Bar codes are ubiquitous -- they are used to identify products in stores, parts in a warehouse, and books in a library, etc. In this talk, the speaker will describe how information is encoded in a bar code and how it is read by a scanner. The presentation will go over how the decoding process, from scanner signal to coded information, can be formulated as an inverse problem. The inverse problem involves finding the "word" hidden in the signal. What makes this inverse problem, and the approach to solve it, somewhat unusual is that the unknown has a finite number of states.

BIO:

Fadil Santosa received his PhD in Theoretical and Applied Mechanics from the University of Illinois in 1980. He held positions at Cornell University and University of Delaware before joining the faculty of the School of Mathematics as Professor in 1995. He currently serves as the director of the Institute for Mathematics and its Applications. His research interests are in inverse problems, optimal design, and optics.