Contact Info

Email:     bpotetz @
Office:    Wean Hall 3708
Tel:       (412) 268-8184
Advisor:   Tai Sing Lee
Mail:      Computer Science Department

           Carnegie Mellon University
           5000 Forbes Avenue
           Pittsburgh, PA 15206 USA

Research Links Stuff
Picture of Me

In 2002, Tai Sing and I rented an LMS-Z360 range scanner with integrated color photosensor, and acquired about a hundred scans of various outdoor natural scenes. Aside from several exciting research applications, the database also offers some nifty eyecandy opportunities. Here’s a movie I made to demonstrate the database. This was generated from a single scan. Link goes to video.

Our range camera also had the ability to take 360 degree panoramic shots. Here is a quicktime VR of a garden outside Phipps conservatory, which is adjacent to CMU campus. Note that this image has nothing to do with the range-finding component of the database, which is what cost us thousands of dollars. If you've got Quicktime installed, just drag the image around to see more.

Snake is a simple matlab implementation of the A* search approach to active contour finding. I wrote this for Tai Sing to use as a teaching tool in his computer vision course (15-385). This is loosely based on a tool I wrote to help the US National Ice Center to trace icebergs back when I was working at Sensor Systems.

This matlab program help you to digitize (vectorize) edges in images, while providing lots of behind-the-scene features to help computer vision students learn how the algorithm works.  [screenshot, program, docs]

At one point, while working on a grant proposal, Tai Sing asked me if Ramachandran’s famous contour-dependent strips could be parameterized into a family of strips that smoothly warp from one shape to the other while maintaining an invariant intensity profile. Here’s what I came up with. Anyway, we never used it, so I'm posting it here for you to do whatever you want with. Decorate your webpage or something.

The idea here is that the strip is changing shape, but the light source is moving at the same time to cause the intensity at any interiorpoint to remain the same. The strip is generated using Lambertian shading (I didn't just fake the result by guessing some reasonable contour shapes).

My first year at CMU, I decided that animated gifs would be a good way to communicate high dimensional patterns in natural scene statistics with my advisor. But explaining the gifs was harder than explaining the original concept. These obscure animations were all there was to my homepage for years. But some people like them, so here they are.