Tom's Hardware > Forum > Home Theatre > HDTV > [QES]How to convert 1080i to 720p? - No Loss? No Delay?

[QES]How to convert 1080i to 720p? - No Loss? No Delay?

Forum Home Theatre : HDTV - [QES]How to convert 1080i to 720p? - No Loss? No Delay?

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HAHA   03-06-2005 at 08:17:02 AM

Archived from groups: alt.tv.tech.hdtv (More info?)

 

Thay have different resolution and data rate.
Many HD sources are in 1080i format and
most of LCD and PDP have 1280x720 pixels.

Does someone know how the conversion take place?
Is there no conversion loss in quality?

Thank you.
----

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Anonymous   03-06-2005 at 08:17:03 AM
- 0 +

Archived from groups: alt.tv.tech.hdtv (More info?)

 

HaHa wrote:

> Thay have different resolution and data rate.
> Many HD sources are in 1080i format and
> most of LCD and PDP have 1280x720 pixels.
>
> Does someone know how the conversion take place?
> Is there no conversion loss in quality?

There can be plenty of loss. The basic algorithm is to interpolate: to
pick colors at new points by drawing a line between the nearest known
points on either side. A real algorithm ought to be a bit more
sophisticated to do well... a good one should, for instance, detect
when adjacent half-frames of 1080i are showing the same picture, then
they can fill in the 720 image much more sharply than if they make each
720p frame from just a half-frame of 1080i. It might also have to
watch out for the effects of MPEG compression, which can get blown up
and worsened. So overall, don't be too surprised if the quality varies.

Reply to Anonymous
Anonymous   03-06-2005 at 01:37:55 PM
- 0 +

Archived from groups: alt.tv.tech.hdtv (More info?)

 

HaHa wrote:
> Thay have different resolution and data rate.
> Many HD sources are in 1080i format and
> most of LCD and PDP have 1280x720 pixels.

To pick a nit, very few PDP have a native resolution of 1280x720. To a
lesser extent, LCDs also can have computer resolutions instead of HD
resolution.

> Does someone know how the conversion take place?

The receiver and/or display has scaling software.

> Is there no conversion loss in quality?

There can be no perfect, lossless conversion and the quality of scaling
software varies from system to system.

Matthew

--
Thermodynamics and/or Golf for dummies: There is a game
You can't win
You can't break even
You can't get out of the game

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