technoguy

Video production method used for such purposes as reducing flickering of very thin horizontal lines or objects particularly when they are part of subject matter moving up or down. It consists of blending the content of adjacent scan lines which of course reduces vertical resolution. It can be done optically, for example the telecine's flying spot is a bit larger than what should correspond to one scan line and captures the average of what it spans on the film, or it can be done electronically, for example scan line 1 as output is the mixture of lines 1 and 2 from the camera, scan line 2 is the mixture of lines 2 and 3, etc.