The district court explained the background of the case as follows: The '664 patent is a patent relating to stereoscopic (or 3D) imaging technology and includes four major elements: (1) 'a stereoscopic video image pick-up device' (i.e., two cameras), (2) a 'stereoscopic video image display,' (3) a 'cross-point measuring means for measuring [cross-point] information on the cross-point (CP) of opti