changed: - Hardware : An HPGL plotter connected to a computer via the pd [comport] object. Mathieu Bouchard created an [hpgl] object in GridFlow in order to send ASCII commands that comply to the HPGL specifications. The plotter used to be a vinyl cutter but can accept paper rolls or even copper plates for engraving. Software : GridFlow, PureData as well as the open source Ltilib (Lehrstuhl fuer Technische Informatik) machine vision library developed out of Aachen University of Technology. It consists of ~ 500 functions related to the processing and analysis of images. About 100 classes have been ported to GridFlow in an effort to provide more building blocks to develop motion detection applications into GridFlow and PureData. http://gridflow.ca http://ltilib.sourceforge.net