Improved Definition Television

Improved Definition Television (IDTV) is a process applicable in our current televisions, but is available in very few models. The process converts the interlaced image into a non-interlaced one. The initial field (lines 1,3,5, etc.) is stored in computer memory but not shown. Then, the second field (lines 2,4,6, etc.) is added to the first field, and all the scanning lines which make up the complete frame (lines 1,2,3,4,5,6, etc.) are shown at the same time. The effect is one of reducing the visibility of distinct scanning lines when you view the image. However, the process requires very fast computer memory, and “motion artifacts” can be perceived because currently available memory chips are just not quite fast enough (although they are improving). This will show up when the camera is panned from side to side, giving stationary objects in the scene a smeared effect as the camera passes them by. (Look for the effect by watching the spectators at a sporting event when the camera follows the athletes.) Also, the image may not be as sharp as the regular interlaced image. However, if your dealer has a TV with IDTV capability, you should compare it with regular television images, because you might prefer the soft velvety appearance that it typically has.