Date: September, 15th, Thursday
Time: 3:00 pm
Place: Little 339 (the Atrium)
Speaker: Xiqiang Zheng

Drinks and Pizza will be provided after the talk

Title: "Image Transforms on Hexagonal Array Structures"


Abstract: Because hexagonal grid has some advantages over square grid, it has
been studied for a few decades. Recently hexagonal grid is becoming more
interesting because people found promising applications for equal area analysis
of the (digital) earth. To sample an image supported on a given planar region,
polar coordinates are barely used because, when the radius and the angle are
sampled uniformly, areas of the resulted sub-regions are not equal. For a
similar reason, the method of referencing the digital earth using latitude and
longitude is not ideal but the hexagonal grid does a good job. Hence image
processing on hexagonal array structures is becoming more important. In this
seminar, I will talk about the history of hexagonally sampled image processing,
some challenging mathematical problems such as Fourier transforms and wavelet
transforms on hexagonal array structures, and the progress we obtained.

Sincerely yours,


Pengwen Chen
SIAM Gators Group