A PIP system stores data indicative of the location of the center point of an inset picture with respect to a display screen center point in a memory area of a first size. The inset image data is read out of the memory area beginning with the data stored in a memory location known as the "read address"....http://www.google.fr/patents/US5031044?utm_source=gb-gplus-shareBrevet US5031044 - Inset picture centering in a pix-in-pix system
