Software

10.20.2006 Released version of GPAC code (both dlls for matlab and mex source files)
Get the code here!!

 

Research Links

Here are some research related links:

Vision Lab @ UCSB UCLA Image Processing Research Group Library for Level set Methods Princeton The VXL - C++ Computer Vision Library Matlab Poisson Solver Vision Lab @ UCSD Vision Lab @ UCLA
 

Research

firefox I have been working on using variational segmentation techniques based on pixel pairwise similarities. In particular, I am working on a multiphase level set framework to obtain a multiregion segmentation, suitable for grouping the pixels in more than two regions of interest. A fast implementation is proposed.

firefox Geodesic Radius (i.e. a radius based on the geodesic distance from pixels) along with Fast Marching Method can be used to calculate similarities between pixels in a more adaptive and mathematically sound way. In fact, the similarity computation is not restricted to fixed windows, but, in the case of flat regions, we allow large neighborhoods.  

firefox We analyzed the redundancy in calculating all pairs of geodesic distances on a rectangular grid. Fast marching method is an efficient way to estimate the geodesic distances from a point. But when calculated for all the points on the grid, this introduces certain redundancy. Our analysis shows that over 90% of the distances are actually recalculated.

Past Projects - Courses Projects

firefox The topology of genetic and metabolic networks is organized according to a scale-free distribution, in which hubs with large numbers of links are present. We have developed a computational model of aging genes as the hubs of biological networks. The computational model shows that, after generalized damage, the functionality can be significantly restored by a limited intervention on the hubs.

firefox I wrote the Java applet code to show the relationship between the frequency response of a stable digital filter and the position of the poles and the zeros of its transfer function. In this applet you can drag the poles and the zeros and get an idea of what is going on in the frequency domain. Click on the picture on the right to start the applet.  

firefox In this project I wrote a Matlab code to evaluate the performance of different equalization techniques over a given channel and using a Gray coded QPSK as modulation scheme. I compared the complexity/performance tradeoff of MLSE, as well as suboptimal equalization schemes as LMMSE and MMSE-DFE. To download the pdf with the report click on the image on the right.