<font color='#000080'>Only one component's DCDi system will be used. If you decode using a DVD player, then the TV won't reprocess the signal.
If you have a cheap DVD player and an expensive TV, chances are you'd want to let the TV process the interlaced video rather than use the cheap progressive scan (video processing) on the DVD player...
Try both and see which does the best job.
[Edit: DCDi implies Faroudja processing which will not show up in less expensive units, but you'll still need to try both methods to see which has better video processing]</font>