After weeks of playing defense against five Apple patents, Samsung this week went after Apple with two of its own patents: one it says is infringed when people make FaceTime calls, and another that covers the photo gallery feature found on iPhones, iPads, and some iPods. In the case of the video patent, Samsung says its being infringed every time iOS users begin a FaceTime call over cellular networks, or if they send video messages to one another through the Mail and messaging app. In its opening, Apple referred to the technology as being around from the VCR and Betamax days, a dig Samsungs witness — University of Illinois professor Dan Schonfeld — said was an unfair comparison. It was an interesting age for digital video.