A horizontal line (a row) in a video frame. Camcorders sense image frames a line at a time, and display systems create images a line at a time. The scan lines are the vertical resolution of the system ...

I'm not sure of the correct terms, so I'll just call it a scan line. It's basically a like a frame line, 1 pixel tall, slightly out of synch that goes up the screen. The line is not colored ...