What is the retinal.tv modular video processing system?

Beginning August 2006, Luca Rivelli of retinal.tv started developing a modular system based on the Free Open Source real-time graphical programming environment Pure Data by Miller Puckette and two of its extensions, PDP and PiDiP. The system grew to become a full featured solution for real-time video processing, aimed primarily to video art performances and installations. The first work based on the retinal.tv system is Oniricam (for Guy Debord).