Scene acquisition

In order to capture the hand gestures and props I constructed a tabletop display that I call the HOG table. There are four cameras around the outside edge of the table. Each camera is connected via firewire to a mac mini. The cameras are all connected to an external hardware trigger to ensure that all of the cameras capture the scene at the same time. I use libdc1394 for pulling the images off the camera. I use a simple background subtraction technique based on a known model of the background in YUV colour space. I use opencv for extracting contours from the segmented images.