All of those scanners can scan the number of needed pixels to display at
HDTV resolution which is a Maximum resolution (1080i) of 1920 pixels by 1080
pixels.
The fact that a scanner can scan at more that necessary has no bearing on if
you can display an image on a HDTV set in High Definition. HDTVs will show a
SDTV picture just fine, but that is not getting a High Definition image to
the set.
There may be Video cards available for computers that output to YPbPr
(Component Video). Look for ATI cards.
Here is one.
http://www.newegg.com/Product/Product.asp?Item=N82E16814102492
This one is lower cost
http://www.newegg.com/Product/Product.asp?Item=N82E16814102661
The problem is finding a DVD or VCR or DVR or PVR that can record and play a
High Definition picture to the HDTV.
There are lots of current standard definition DVD and VCR machines, but not
many HDTV recording and playback machines for the home consumer.
A good explanation and some details on HD recording that is now available:
http://en.wikipedia.org/wiki/High-definition_video