Historically, frame grabber expansion cards were the predominant way to interface cameras to PCs. Other interface methods have emerged since then, with frame grabbers (and in many case, cameras themselves) connecting to computers via interfaces such as USB, Ethernet and IEEE 1394 ("FireWire"). Modern frame grabber devices often perform functions beyond capturing a single video input. For example, some devices can capture audio in addition to video, and some provide multiple video inputs that are captured concurrently. Other operations may be performed as well, such as deinterlacing, text or graphics overlay, image transformations (e.g., resizing, rotation, mirroring), and real time compression using algorithms such as MPEG2 and JPEG. Also, technological demands in fields such as radar acquisition, manufacturing and remote guidance have led to the development of frame grabbers that can capture images at high frame rates and resolutions.