Feb 02 2006 | 6:28 am

Hey everyone,

I've been working on a little computer vision patch implementing an

interesting paper I read a few weeks ago. To that end, I made 2 new

externals along the way. One which calculates the median of an image.

If given a 3d buffer, it will calculate the temporal median at each

pixel, providing a nice and simple way to acquire the background image

of a scene. The other external computes an algorithm called the "A

Contrario Method" of segmentation.

It uses a statistical distance measure to calculate the most

meaningful portions of an image based on comparing the gradient of the

background image and a frame. I've implemented most of the algorithm

here but haven't done the final refinement step. Also, the code is

highly beta and is thus very unoptimized.

In the download package, I've provided the new externals compiled for

OSX as well as the patch and source code for the algorithm's external.

There's also a schematic of the patch/source code and a PDF of the

paper. If anyone wants a Windoze version, contact me and if I get

bugged enough, I'll make one.

Here's the link: http://www.mat.ucsb.edu/~whsmith/vision.html . The

download link is at the bottom of the page.

cheers,

wes