[opendtv] Re: Learning From the Veterans - local news in HD

  • From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
  • To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
  • Date: Thu, 29 Apr 2010 17:18:33 -0500

Leonard Caillouet wrote:

> I am really trying to understand your perspective, but I can't follow
> what you are saying. Who is insisting on "4:3 HD capture" and what
> exactly does that mean?

Both Mark and Craig explained how the HD image capture is, or can be, made to 
high res 4:3. That image is then used "as is" for the SD 4:3 video streams, and 
tilt-scan used on it to create the 16:9 version for the HD tier. The advantage 
being, of course, common sides in both 4:3 and 16:9. And supposedly no loss of 
info to the 16:9 HD displays out there.

> How would the ball disappear on the sides if you are using common sides.

I'm not being very profound. Just saying that *if* you use the 4:3 "as is" to 
send to the SD tier, i.e. to all those analog CRTs out there, *then* small 
objects in the 4:3 HD image would disappear on analog displays. Like the soccer 
ball. To prevent that from happening, a videographer would have to zoom in on 
the ball more than he would for ideal HD. Resulting in a considerably less than 
optimal HD 16:9 version, after the zooming in and the tilting and scanning.

I'm no videographer. My bet is, ask one, or watch closely what they're doing 
instinctively, and my bet is that this is what they do.

IMO, the "right way" to extract 4:3 SD and 16:9 HD from this 4:3 HD capture, in 
the case of sports where common sides is not a real issue, would be to only do 
tilt-scan to extract the 16:9, and do BOTH tilt-scan AND pan-scan for the 4:3 
SD output. That way, the 16:9 HD benefits from the extra angle of view, and the 
4:3 analog displays can still make out the ball.

Bert
 
 
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