Spring 2011 Comp Cameras/Spatial Media
Summary: The Augmented Reality Marker board is the first iteration of a mobile interactive projection mapping platform for kids. It was designed for use within a pediatric hospital environment and to be placed on a hospital bedside tabel. With a small camera and projector unit above the board, the AR Marker board allows for imagery to be accurately projected directly onto the board. The two videos to the right demonstrate the functionality and technology of the board.
User Experience: Once the mobile camera-projector unit (see picture below) are set in place, the board can be positioned anywhere in their line of sight. The user is encouraged to place four AR markers on the corners of the board. Once the camera/computer recognizes all four markers, it appropriately displays an image within the marker framework. A user can freely move the markers and board around, which then affects the projected imagery in terms of content, proportion, and interaction.
Technology: A small LG projector was used along with a very small web cam. Java in Eclipse was the main programming language and the NyARToolkit along with the AR Toolkit Marker was utilized to create and recognize the AR Markers. Andrew Lazarow implemented a keystone library that handled all of the necessary image manipulation. We constructed two versions of the board and markers (see picture below), one from acrylic and another from light wood. The augmented reality markers for both boards were etched using a precision laser cutter.
Goals: Our motivation for the project was our interest in “Medical Media” are desire to create a board that could be effectively used within a hospital environment. To do this this required a sterile, mobile piece of equipment that could easily be set-up, functional, and dismantled at a moments notice. The final project was functional, but it did not reach a state robust enough to be implemented in an actual hospital environment. Future iterations would incorporate an IR camera that would offer more stable and reliable marker tracking when presented with a variety of lighting environments.
Collaborator: Andrew Lazarow